Journal articles: 'Milankovich cycles'

1

Pomortsev, O. A., V. R. Filippov, and S. S. Rozhin. "Transgressive Pleistocene Cycles and Their Place on the Milankovich Scale." IOP Conference Series: Earth and Environmental Science 666, no. 3 (March 1, 2021): 032068. http://dx.doi.org/10.1088/1755-1315/666/3/032068.

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Michael Oldfield Jonas. "The inter-glacial cycle is not a 100,000-year cycle, it is a shorter cycle with missing beats." World Journal of Advanced Research and Reviews 13, no. 3 (March 30, 2022): 388–92. http://dx.doi.org/10.30574/wjarr.2022.13.3.0259.

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The "100,000-year problem" refers to an apparent unexplained change in the frequency of inter-glacial periods which occurred about a million years ago. Before that, inter-glacial periods seemed to occur about every 41,000 years, in line with the obliquity Milankovich cycle. But after that, they seemed to occur about every 100,000 years, in line with the orbital inclination Milankovich cycle. Examination of the data shows that there never was a 41,000-year cycle, and that there is no 100,000-year cycle, but that the most influential cycle is the approx 21,000-year precession cycle which is the major factor in the cycles of insolation at higher latitudes. Insolation at 65N is generally regarded as the most significant of these. Inspection of the data shows that every glacial termination (start of an inter-glacial period) began at a time when insolation at 65N increased from a low point in its cycle. That not every such cycle triggered a new inter-glacial period underlines the chaotic non-linear nature of Earth's climate. Until about a million years ago, this cycle occasionally "missed a beat", making the inter-glacial frequency average about 41,000 years. After that, the cycle started missing more "beats", making the inter-glacial frequency average about 100,000 years. There never was an actual 41,000-year or 100,000-year inter-glacial cycle.

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Pomortsev, O. A. "The response of rhythmically forming processes to the latitudinal position of the zones of their implementation." Vestnik of North-Eastern Federal University Series "Earth Sciences", no. 3 (September 21, 2023): 35–41. http://dx.doi.org/10.25587/svfu.2023.31.3.005.

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The problem of variability of the Milankovich scale and cyclic oscillations in the troposphere circulation mode depending on the geographical latitude of the area is investigated. Parallels in the dynamics of multi-thousand-year and intra-century climate cycles in different latitudinal zones and possible causes of this phenomenon are considered. New data on the influence of axial rotation and the shape of the Earth on the structure of rhythm-forming processes are presented. It is established that the zone with a high frequency of pulsations of climatic phases is confined to low latitudes with the highest energy potential. The dependence of the velocity of air currents on the length of geographical parallels is shown. Thus, during the formation of air currents near the equator – the longest parallel of the planet (Hadley circulation cell), their velocity, which is set by the axial rotation of the Earth, is higher than the speed of sound and twice as high as similar flows originating in the temperate latitudes (Ferell cell). Paleogeographic evidence confirming Milankovich’s calculations about the different duration of the solar cycle period in the low, temperate and polar latitudes is presented. Thus, the dating of the terraces of the island of Barbados in the Caribbean Sea (low latitudes) showed that the period of the Milankovich cycle here is close to 20 thousand years. While in the zone of temperate latitudes, the period of the same cycle, judging by the dating of the stadial moraines of the former glacial covers, is 41 thousand years, i. e. twice as long. Maximum – up to 100 thousand years – set for polar latitudes in the study of the ice sheets of Antarctica and Greenland. Different degrees of meteorological impacts on ecosystems and the level of natural hazards within different latitudinal corridors have been revealed. The most dynamic and dangerous are the low latitudes with their hurricanes, typhoons, floods and storms with high frequency. This should be taken into account when developing a strategy for the economic development of high-risk territories and preventive measures for the protection of engineering orientation.

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Solé, J., A. Turiel, and J. E. Llebot. "Using empirical mode decomposition to correlate paleoclimatic time-series." Natural Hazards and Earth System Sciences 7, no. 2 (April 17, 2007): 299–307. http://dx.doi.org/10.5194/nhess-7-299-2007.

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Abstract. Determination of the timing and duration of paleoclimatic events is a challenging task. Classical techniques for time-series analysis rely too strongly on having a constant sampling rate, which poorly adapts to the uneven time recording of paleoclimatic variables; new, more flexible methods issued from Non-Linear Physics are hence required. In this paper, we have used Huang's Empirical Mode Decomposition (EMD) for the analysis of paleoclimatic series. We have studied three different time series of temperature proxies, characterizing oscillation patterns by using EMD. To measure the degree of temporal correlation of two variables, we have developed a method that relates couples of modes from different series by calculating the instantaneous phase differences among the associated modes. We observed that when two modes exhibited a constant phase difference, their frequencies were nearly equal to that of Milankovich cycles. Our results show that EMD is a good methodology not only for synchronization of different records but also for determination of the different local frequencies in each time series. Some of the obtained modes may be interpreted as the result of global forcing mechanisms.

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Salamatin, Andrey N., and Catherine Ritz. "A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica." Annals of Glaciology 23 (1996): 28–35. http://dx.doi.org/10.3189/s0260305500013227.

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The equation describing the surface evolution of a large ice sheet is examined on the basis of a scale analysis applied to Antarctic conditions. Changes in the surface elevation are mainly driven by mass-balance fluctuations which approximately follow global atmospheric temperature variations. The essential spatial non-uniformity of the accumulation rate and the resultant difference between central and coastal regions in reaction time-scales are taken into account. The dynamic interaction of the time-lagging interior with the quasi-stationary margin is described. As a result, a simplified model is deduced to simulate the surface-elevation variations in the central parts of the Antarctic ice sheet caused by mass-balance perturbations corresponding to the main Milankovich cycles with the periods of 19–100 kyears. Special computational tests are performed to validate the model through intercomparison with the predictions obtained with a two-dimensional thermomechanical model. The sensitivity of the model to physical factors (represented by dimensionless tuning parameters) is discussed. Climatically controlled variations of the ice-sheet thickness in the vicinity of Vostok Station during the past 200 kyears are estimated.

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Salamatin, Andrey N., and Catherine Ritz. "A simplified multi-scale model for predicting climatic variations of the ice-sheet surface elevation in central Antarctica." Annals of Glaciology 23 (1996): 28–35. http://dx.doi.org/10.1017/s0260305500013227.

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The equation describing the surface evolution of a large ice sheet is examined on the basis of a scale analysis applied to Antarctic conditions. Changes in the surface elevation are mainly driven by mass-balance fluctuations which approximately follow global atmospheric temperature variations. The essential spatial non-uniformity of the accumulation rate and the resultant difference between central and coastal regions in reaction time-scales are taken into account. The dynamic interaction of the time-lagging interior with the quasi-stationary margin is described. As a result, a simplified model is deduced to simulate the surface-elevation variations in the central parts of the Antarctic ice sheet caused by mass-balance perturbations corresponding to the main Milankovich cycles with the periods of 19–100 kyears. Special computational tests are performed to validate the model through intercomparison with the predictions obtained with a two-dimensional thermomechanical model. The sensitivity of the model to physical factors (represented by dimensionless tuning parameters) is discussed. Climatically controlled variations of the ice-sheet thickness in the vicinity of Vostok Station during the past 200 kyears are estimated.

7

Lopes, Fernando, Vincent Courtillot, Dominique Gibert, and Jean-Louis Le Mouël. "Extending the Range of Milankovic Cycles and Resulting Global Temperature Variations to Shorter Periods (1–100 Year Range)." Geosciences 12, no. 12 (December 5, 2022): 448. http://dx.doi.org/10.3390/geosciences12120448.

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The Earth’s revolution is modified by changes in inclination of its rotation axis. Its trajectory is not closed and the equinoxes drift. Changes in polar motion and revolution are coupled through the Liouville–Euler equations. Milanković (1920) argued that the shortest precession period of solstices is 20,700 years: the summer solstice in one hemisphere takes place alternately every 11,000 year at perihelion and at aphelion. Milanković assumed that the planetary distances to the Sun and the solar ephemerids are constant. There are now observations that allow one to drop these assumptions. We have submitted the time series for the Earth’s pole of rotation, global mean surface temperature and ephemeris to iterative Singular Spectrum Analysis. iSSA extracts from each a trend a 1 year and a 60 year component. Both the apparent drift of solstices of Earth around the Sun and the global mean temperature exhibit a strong 60 year oscillation. We monitor the precession of the Earth’s elliptical orbit using the positions of the solstices as a function of Sun–Earth distance. The “fixed dates” of solstices actually drift. Comparing the time evolution of the winter and summer solstices positions of the rotation pole and the first iSSA component (trend) of the temperature allows one to recognize some common features. A basic equation from Milankovic links the derivative of heat received at a given location on Earth to solar insolation, known functions of the location coordinates, solar declination and hour angle, with an inverse square dependence on the Sun–Earth distance. We have translated the drift of solstices as a function of distance to the Sun into the geometrical insolation theory of Milanković. Shifting the inverse square of the 60 year iSSA drift of solstices by 15 years with respect to the first derivative of the 60 year iSSA trend of temperature, that is exactly a quadrature in time, puts the two curves in quasi-exact superimposition. The probability of a chance coincidence appears very low. Correlation does not imply causality when there is no accompanying model. Here, Milankovic’s equation can be considered as a model that is widely accepted. This paper identifies a case of agreement between observations and a mathematical formulation, a case in which an element of global surface temperature could be caused by changes in the Earth’s rotation axis. It extends the range of Milankovic cycles and resulting global temperature variations to shorter periods (1–100 year range), with a major role for the 60-year oscillation).

8

Smirnov, Boris M. "Physics of the Earth’s Glacial Cycle." Foundations 2, no. 4 (December 7, 2022): 1114–28. http://dx.doi.org/10.3390/foundations2040073.

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The evolution of the atmospheric temperature in the past, resulted from the EPICA project (European Project for Ice Coring in Antarctica) for the analysis of air bubbles in ice deposits near three weather stations in Antarctica, includes several glacial cycles. According to these studies, the glacial cycle consists of a slow cooling of the Earth’s surface at a rate of about 10−4∘C per year for almost the entire time of a single cycle (about 100 thousand years) and of a fast process of heating the planet, similar to a thermal explosion. The observed cooling of the planet follows from the imbalance of energy fluxes absorbed by the Earth and going into its surrounding space, and this imbalance is four orders of magnitude less than the accuracy of determination of the fluxes themselves. The inconsistency of the popular Milankovich theory is shown, according to which glacial cycles in the evolution of the Earth’s thermal state are associated with changes in the Earth’s orbit relative to the Sun. In considering the glacial cycle as the transition between the warm (contemporary) and cold thermal states of the Earth with a difference in their temperatures of 12 ∘C according to measurements, we construct the energetic balance for each of Earth’s states. The fast transition between the Earth’s cold and warm states results from the change of the Earth’s albedo due to the different volcano activity in these states. There is the feedback between the aggregate state of water covering the Earth’s surface and volcanic eruptions, which become intense when ice covers approximately 40% of the Earth’s surface. Dust measurements in ice deposits within the framework of the EPICA project confirms roughly a heightened volcano eruption during the cold phase of the glacial cycle. Numerical parameters of processes related to the glacial cycle are analyzed.

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Gabdullin, R. R., A. Yu Puzik, S. I. Merenkova, I. R. Migranov, N. V. Badulina, A. V. Ivanov, and M. D. Kazurov. "Lithological and geochemical characteristics and paleoclimatic conditions of the origin of Upper Cretaceous deposits of the epicontinental basin of the Russian plate in the region of the Ulyanovsk-Saratov foredeep." Moscow University Bulletin. Series 4. Geology 1, no. 2 (January 28, 2022): 20–33. http://dx.doi.org/10.33623/0579-9406-2021-2-20-33.

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The results of a geochemical study and paleogeographic, paleoclimatic interpretation for a cyclically constructed section of upper Cretaceous deposits near Volsk city, Saratov region, are presented. Elementary formation cyclites and cyclic variations of a number of certain parameters were associated with the Milankovich astronomical-climatic cycles. The curves of changes of paleotemperature, humidity, paleobathymetry were compiled. The results obtained give an idea of the migration of the arid belt boundaries in the upper Cretaceous and the overall climatic zonation, which is important for regional and global paleoclimatic reconstructions, as well as the history of the development of shelf seas that covered the Russian plate (especially Ulyanovsk-Saratov trough). Paleotemperatures of the land surface in the denudation areas are obtained from the chemical index of alteration (CIA). In the Turonian-Campanian interval selected climatic cyclicity, including period of relative cooling (Turonian–Coniacian) with paleotemperature about 20 °С, the period of relative warming in the mid-late Campanian (20–24 °С), the cooling time at the end of the late Campanian (19–21 °С) and the period of warming at the turn of the Campanian and Maastrichtian and in the early Maastrichtian time. In Maastrichtian age, there are two climatic cycles, beginning with a time of relative cooling (about 19 °С) and ending with a time of relative warming (about 20 С, at the end of Maastrichtian to 25 °С). The cycles of climate humidity change are also determined: two cycles in Campanian time, three cycles in early Maastrichtian, and one cycle in late Maastrichtian. The boundary of the early and late Maastrichtian corresponds to the change of arid conditions to humid ones. The paleobatimetry curves show transgressive-regressive cycles: one in the late Turonian-Coniacian time, two in the late Campanian time, five in the early Maastrichtian time, and one in the late Maastrichtian time. Depth variations were estimated: in the Turonian-Coniacian time in the range of 70–80 m, in the Campanian-Maastrichtian time, the paleobatimetry consistently increased and changed from 100 to 200 m (on average about 150 m). The results obtaired give and idea of the migration of the boundaries of the arid belt in the Late Creataceous and main features of the climatic zonation, which is important for regional and global paleoclimatic reconstructions, as well as for the history of the development the Russian plate in the Ulyanovsk-Saratov region.

10

Salamatin, Andrey N., Elena A. Tsyganova, Vladimir Ya Lipenkov, and Jean Robert Petit. "Vostok (Antarctica) ice-core time-scale from datings of different origins." Annals of Glaciology 39 (2004): 283–92. http://dx.doi.org/10.3189/172756404781814023.

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AbstractThree different approaches to ice-core age dating are employed to develop a depth–age relationship at Vostok, Antarctica: (1) correlating the ice-core isotope record to the geophysical metronome (Milankovich surface temperature cycles) inferred from the borehole temperature profile, (2) importing a known chronology from another (Devils Hole, Nevada, USA) paleoclimatic signal, and (3) direct ice-sheet flow modeling. Inverse Monte Carlo sampling is used to constrain the accumulation-rate reconstruction and ice-flow simulations in order to find the best-fit glaciological time-scale matched with the two other chronologies. The general uncertainty of the different age estimates varies from 2 to 6 kyr on average and reaches 6–15 kyr at maximum. Whatever the causes of this discrepancy might be, they are thought to be of different origins, and the age errors are assumed statistically independent. Thus, the average time-scale for the Vostok ice core down to 3350m depth is deduced consistent with all three dating procedures within the standard deviation limits of ±3.6 kyr, and its accuracy is estimated as 2.2 kyr on average. The constrained ice-sheet flow model allows, at least theoretically, extrapolation of the ice age–depth curve further to the boundary with the accreted lake ice where (at 3530m depth) the glacier-ice age may reach ∼2000 kyr.

11

Posmentier, E. S. "Response of an ocean-atmosphere climate model to Milankovic forcing." Nonlinear Processes in Geophysics 1, no. 1 (March 31, 1994): 26–30. http://dx.doi.org/10.5194/npg-1-26-1994.

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Abstract. There is considerable evidence in support of Milankovic's theory that variations in high-latitude summer insolation caused by Earth orbital variations are the cause of the Pleistocene ice cycles. The enigmatic discrepancy between the spectra of Milankovic forcing and of Pleistocene climate variations is believed to be resolved by the slow, nonlinear response of ice sheets to changes in solar seasonality. An experiment with a preliminary version of a 14-region atmosphere/snow/upper ocean climate model demonstrates that the response of the ocean-atmosphere system alone to Milankovic forcing is capable of driving ice cycles with the observed spectrum. This occurs because of the highly nonlinear response of both the thermal seasons and the annual mean temperature to solar seasons, which is caused in turn by the highly nonlinear feedback between temperature and snow and sea ice.

12

Abdussamatov, H. I., Ye V. Lapovok, and S. I. Khankov. "Decrease in temperatures of the ocean and the atmosphere and approach of big Ice Age in the conditions of establishment of cycles of Milankovich." Journal International Academy of Refrigeration 16, no. 3 (2017): 62–66. http://dx.doi.org/10.21047/1606-4313-2017-16-3-62-66.

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Prokopenko, Alexander A., Eugene B. Karabanov, Douglas F. Williams, Mikhail I. Kuzmin, Nicholas J. Shackleton, Simon J. Crowhurst, John A. Peck, Alexander N. Gvozdkov, and John W. King. "Biogenic Silica Record of the Lake Baikal Response to Climatic Forcing during the Brunhes." Quaternary Research 55, no. 2 (March 2001): 123–32. http://dx.doi.org/10.1006/qres.2000.2212.

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AbstractThis work presents a detailed, orbitally tuned biogenic silica record of continental paleoclimate change during the Brunhes chron. The Brunhes/Matuyama boundary lies within the warm isotopic stage 19 in Baikal, and the boundaries between eight lithological cycles correspond to terminations in the marine oxygen isotope record. The high amplitude and resolution of climatically driven changes in BioSi content in Lake Baikal sediments permits tuning of almost every precessional cycle during the Brunhes and reveals the structure of interglacial stages. For example, the last three interglacial stages (MIS 5, 7, and 9) clearly consist of five substages (a, b, c, d, e) corresponding to precessional insolation peaks. Abrupt and intense regional glaciations in Siberia during substages 5d and 7d were driven by extreme insolation minima. During substage 9d cooling was more gradual in response to more moderate forcing. The impact of strong glaciation is also observed in the middle of stage 15, where full glacial conditions appear to have lasted for over 30,000 yr during substages 15d, 15c, and 15b. Marine oxygen isotopic stage 11 appears to be the warmest period during the Brunhes in the Lake Baikal record, with at least three substages.A new hypothesis is presented regarding the response of the Lake Baikal BioSi record to insolation forcing. Based on the mechanism controlling modern diatom blooms, biogenic silica production is hypothesized to be dependent on changes in the heat balance of the lake and consequently on changes in the thermal structure of the water column. This mechanism is also sensitive to short-term sub-Milankovich cooling events, such as the mid-Eemian cooling, the Montaigu event during substage 5c, and a cooling which appears to be analogous to the Montaigu event during substage 9c. The continuity of the Lake Baikal paleoclimate record, its sensitivity to orbital forcing, and its high resolution make it an excellent candidate for a new “paleoclimatic stratotype” section for continental Asia.

14

Yuan, Rui, Rui Zhu, Shiwen Xie, Wei Hu, Fengjuan Zhou, and Ye Yu. "Utilizing Maximum Entropy Spectral Analysis (MESA) to identify Milankovitch cycles in Lower Member of Miocene Zhujiang Formation in north slope of Baiyun Sag, Pearl River Mouth Basin, South China Sea." Open Geosciences 11, no. 1 (December 8, 2019): 877–87. http://dx.doi.org/10.1515/geo-2019-0068.

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Abstract Logs in the petroleum boreholes indirectly records the sedimentary cycles in the deep burial formation. In order to extract and understand the periodicity and cyclicity, it is necessary to process the data by digital signal analysis method. Taking the gamma ray (GR) log as the primary material, an identification approach of Milankovitch cycles in boreholes is proposed in this paper, which is based on the Maximum Entropy Spectral Analysis (MESA). The first stage chooses the appropriate windows for calculating the frequency spectral properties in a short section of the data. In each depth window, the second stage generates the two-dimension frequency spectrum utilizing the MESA. At each depth point, the third stage finds the potential Milankovitch cycles in the one-dimension frequency spectrum, in which the average amplitude spectrum peak would be matched to the ratio of Milankovitch period. According to the frequency and wavelength of the maximum amplitude in Milankovitch cycles, the fourth stage estimates the sedimentation rate controlled by cyclical factor. Finally, the Milankovitch cycles in Lower Member of Miocene Zhujiang Formation in north slope of Baiyun Sag, Pearl River Mouth Basin, are identified and the cyclical sedimentation rate is estimated. The results demonstrate that the proposed method is feasible and effective to identify Milankovitch cycles in boreholes, which may contribute to the other geological researches.

15

ADAMS, J. M., H. FAURE, and N. PETIT-MAIRE. "Methane and Milankovitch cycles." Nature 355, no. 6357 (January 1992): 214. http://dx.doi.org/10.1038/355214a0.

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16

Bennett, K. D. "Milankovitch cycles and their effects on species in ecological and evolutionary time." Paleobiology 16, no. 1 (1990): 11–21. http://dx.doi.org/10.1017/s0094837300009684.

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The Quaternary ice ages were paced by astronomical cycles with periodicities of 20–100 k.y. (Milankovitch cycles). These cycles have been present throughout earth history. The Quaternary fossil record, marine and terrestrial, near to and remote from centers of glaciation, shows that communities of plants and animals are temporary, lasting only a few thousand years at the most. Response of populations to the climatic changes of Quaternary Milankovitch cycles can be taken as typical of the way populations have behaved throughout earth history. Milankovitch cycles thus force an instability of climate and other aspects of the biotic and abiotic environment on time scales much less than typical species durations (1–30 m.y.). Any microevolutionary change that accumulates on a time scale of thousands of years is likely to be lost as communities are reorganized following climatic changes. A four-tier hierarchy of time scales for evolutionary processes can be constructed as follows: ecological time (thousands of years), Milankovitch cycles (20–100 k.y.), geological time (millions of years), mass extinctions (approximately 26 m.y.). “Ecological time” and “geological time” are defined temporally as the intervals between events of the second and fourth tiers, respectively. Gould's (1985) “paradox of the first tier” can be resolved, at least in part, through the undoing of Darwinian natural selection at the first tier by Milankovitch cycles at the second tier.

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Crowley, Thomas J., Kuor-Jier Joseph Yip, and Steven K. Baum. "Milankovitch cycles and carboniferous climate." Geophysical Research Letters 20, no. 12 (June 18, 1993): 1175–78. http://dx.doi.org/10.1029/93gl01119.

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Ganopolski, Andrey. "Toward generalized Milankovitch theory (GMT)." Climate of the Past 20, no. 1 (January 18, 2024): 151–85. http://dx.doi.org/10.5194/cp-20-151-2024.

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Abstract. In recent decades, numerous paleoclimate records and results of model simulations have provided strong support for the astronomical theory of Quaternary glacial cycles formulated in its modern form by Milutin Milankovitch. At the same time, new findings have revealed that the classical Milankovitch theory is unable to explain a number of important facts, such as the change in the dominant periodicity of glacial cycles from 41 to 100 kyr about 1 million years ago. This transition was also accompanied by an increase in the amplitude and asymmetry of the glacial cycles. Here, based on the results of a hierarchy of models and data analysis, a framework of the extended (generalized) version of the Milankovitch theory is presented. To illustrate the main elements of this theory, a simple conceptual model of glacial cycles was developed using the results of an Earth system model, CLIMBER-2. This conceptual model explicitly assumes the multistability of the climate–cryosphere system and the instability of the “supercritical” ice sheets. Using this model, it is shown that Quaternary glacial cycles can be successfully reproduced as the strongly nonlinear response of the Earth system to the orbital forcing, where 100 kyr cyclicity originates from the phase locking of the precession and obliquity-forced glacial cycles to the corresponding eccentricity cycle. The eccentricity influences glacial cycles solely through its amplitude modulation of the precession component of orbital forcing, while the long timescale of the late Quaternary glacial cycles is determined by the time required for ice sheets to reach their critical size. The postulates used to construct this conceptual model were justified using analysis of relevant physical and biogeochemical processes and feedbacks. In particular, the role of climate–ice sheet–carbon cycle feedback in shaping and globalization of glacial cycles is discussed. The reasons for the instability of the large northern ice sheets and the mechanisms of the Earth system escape from the “glacial trap” via a set of strongly nonlinear processes are presented. It is also shown that the transition from the 41 to the 100 kyr world about 1 million years ago can be explained by a gradual increase in the critical size of ice sheets, which in turn is related to the gradual removal of terrestrial sediments from the northern continents. The implications of this nonlinear paradigm for understanding Quaternary climate dynamics and the remaining knowledge gaps are finally discussed.

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Abdussamatov, H. I., Ye V. Lapovok, and S. I. Khankov. "Planetary temperature calculations under Milankovitch cycles." Journal International Academy of Refrigeration 15, no. 3 (2016): 82–86. http://dx.doi.org/10.21047/1606-4313-2016-15-3-82-86.

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de Winter, N. J., C. Zeeden, and F. J. Hilgen. "Low-latitude climate variability in the Heinrich frequency band of the Late Cretaceous greenhouse world." Climate of the Past 10, no. 3 (May 22, 2014): 1001–15. http://dx.doi.org/10.5194/cp-10-1001-2014.

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Abstract. Deep marine successions of early Campanian age from DSDP (Deep Sea Drilling Project) site 516F drilled at low paleolatitudes in the South Atlantic reveal distinct sub-Milankovitch variability in addition to precession, obliquity and eccentricity-related variations. Elemental abundance ratios point to a similar climatic origin for these variations and exclude a quadripartite structure as an explanation for the inferred semi-precession cyclicity in the magnetic susceptibility (MS) signal as observed in the Mediterranean Neogene for precession-related cycles. However, semi-precession cycles as suggested by previous work are likely an artifact reflecting the first harmonic of the precession signal. The sub-Milankovitch variability, especially in MS, is best approximated by a ~7 kyr cycle as shown by spectral analysis and bandpass filtering. The presence of sub-Milankovitch cycles with a period similar to that of Heinrich events of the last glacial cycle is consistent with linking the latter to low-latitude climate change caused by a non-linear response to precession-induced variations in insolation between the tropics.

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Chen, Panpan, Nianqiao Fang, Cunlei Li, and Jianmei Liu. "A method for the division of the conglomerate depositional cycle under Milankovitch cycles." Journal of Geophysics and Engineering 14, no. 3 (April 4, 2017): 611–20. http://dx.doi.org/10.1088/1742-2140/aa6168.

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Kostadinov, T. S., and R. Gilb. "Earth Orbit v2.1: a 3-D visualization and analysis model of Earth's orbit, Milankovitch cycles and insolation." Geoscientific Model Development 7, no. 3 (June 3, 2014): 1051–68. http://dx.doi.org/10.5194/gmd-7-1051-2014.

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Abstract. Milankovitch theory postulates that periodic variability of Earth's orbital elements is a major climate forcing mechanism, causing, for example, the contemporary glacial–interglacial cycles. There are three Milankovitch orbital parameters: orbital eccentricity, precession and obliquity. The interaction of the amplitudes, periods and phases of these parameters controls the spatio-temporal patterns of incoming solar radiation (insolation) and the timing and duration of the seasons. This complexity makes Earth–Sun geometry and Milankovitch theory difficult to teach effectively. Here, we present "Earth Orbit v2.1": an astronomically precise and accurate model that offers 3-D visualizations of Earth's orbital geometry, Milankovitch parameters and the ensuing insolation forcing. The model is developed in MATLAB® as a user-friendly graphical user interface. Users are presented with a choice between the Berger (1978a) and Laskar et al. (2004) astronomical solutions for eccentricity, obliquity and precession. A "demo" mode is also available, which allows the Milankovitch parameters to be varied independently of each other, so that users can isolate the effects of each parameter on orbital geometry, the seasons, and insolation. A 3-D orbital configuration plot, as well as various surface and line plots of insolation and insolation anomalies on various time and space scales are produced. Insolation computations use the model's own orbital geometry with no additional a priori input other than the Milankovitch parameter solutions. Insolation output and the underlying solar declination computation are successfully validated against the results of Laskar et al. (2004) and Meeus (1998), respectively. The model outputs some ancillary parameters as well, e.g., Earth's radius-vector length, solar declination and day length for the chosen date and latitude. Time-series plots of the Milankovitch parameters and several relevant paleoclimatological data sets can be produced. Both research and pedagogical applications are envisioned for the model.

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Kostadinov, T. S., and R. Gilb. "Earth Orbit v2.1: a 3-D visualization and analysis model of Earth's orbit, Milankovitch cycles and insolation." Geoscientific Model Development Discussions 6, no. 4 (November 28, 2013): 5947–80. http://dx.doi.org/10.5194/gmdd-6-5947-2013.

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Abstract. Milankovitch theory postulates that periodic variability of Earth's orbital elements is a major climate forcing mechanism, causing, for example, the contemporary glacial-interglacial cycles. There are three Milankovitch orbital parameters: orbital eccentricity, precession and obliquity. The interaction of the amplitudes, periods and phases of these parameters controls the spatio-temporal patterns of incoming solar radiation (insolation) and the timing of the seasons with respect to perihelion. This complexity makes Earth–Sun geometry and Milankovitch theory difficult to teach effectively. Here, we present "Earth Orbit v2.1": an astronomically precise and accurate model that offers 3-D visualizations of Earth's orbital geometry, Milankovitch parameters and the ensuing insolation forcing. The model is developed in MATLAB® as a user-friendly graphical user interface. Users are presented with a choice between the Berger (1978a) and Laskar et al. (2004) astronomical solutions for eccentricity, obliquity and precession. A "demo" mode is also available, which allows the Milankovitch parameters to be varied independently of each other, so that users can isolate the effects of each parameter on orbital geometry, the seasons, and insolation. A 3-D orbital configuration plot, as well as various surface and line plots of insolation and insolation anomalies on various time and space scales are produced. Insolation computations use the model's own orbital geometry with no additional a priori input other than the Milankovitch parameter solutions. Insolation output and the underlying solar declination computation are successfully validated against the results of Laskar et al. (2004) and Meeus (1998), respectively. The model outputs some ancillary parameters as well, e.g. Earth's radius-vector length, solar declination and day length for the chosen date and latitude. Time-series plots of the Milankovitch parameters and EPICA ice core CO2 and temperature data can be produced. Both research and pedagogical applications are envisioned for the model.

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de Winter, N. J., C. Zeeden, and F. J. Hilgen. "Low-latitude climate variability in the Heinrich frequency band of the Late Cretaceous Greenhouse world." Climate of the Past Discussions 9, no. 4 (August 8, 2013): 4475–98. http://dx.doi.org/10.5194/cpd-9-4475-2013.

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Abstract. Deep marine successions of early Campanian age from DSDP site 516F drilled at low paleolatitudes in the South Atlantic reveal distinct sub-Milankovitch variability in addition to precession and eccentricity related variations. Elemental abundance ratios point to a similar climatic origin for these variations and exclude a quadripartite structure – as observed in the Mediterranean Neogene – of the precession related cycles as an explanation for the inferred semi-precession cyclicity in MS. However, the semi-precession cycle itself is likely an artifact, reflecting the first harmonic of the precession signal. The sub-Milankovitch variability is best approximated by a ~ 7 kyr cycle as shown by spectral analysis and bandpass filtering. The presence of sub-Milankovitch cycles with a period similar to that of Heinrich events of the last glacial cycle is consistent with linking the latter to low-latitude climate change caused by a non-linear response to precession induced variations in insolation between the tropics.

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Hinnov, Linda A., and Richard J. Diecchio. "Milankovitch cycles in the Juniata Formation, Late Ordovician, Central Appalachian Basin, USA." Stratigraphy 12, no. 3-4 (2016): 287–96. http://dx.doi.org/10.29041/strat.12.4.07.

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The Juniata Formation is a thick succession of prevalently red, cyclically bedded arenites, wackes, and mudrocks found in the Upper Ordovician of the Central Appalachian Basin, USA. In outcrops close to the study area, the Juniata cycles predominantly have the characteristics of regressive tidal flat deposits. Long and continuous well logs of the subsurface Juniata provide an unparalleled opportunity to investigate Milankovitch controls on the cyclic deposition. In the Preston 119 well, northern West Virginia, a 2700-ft long gamma-ray well log provides a high-resolution proxy of terrigenous siliciclastic flux to the northern Central Appalachian Basin shoreline, from the early Maysvillian (Reedsville Shale) to the Ordovician/Silurian transition (Tuscarora Sandstone). The gamma-ray cycles provide strong evidence for sea level oscillations forced by Milankovitch cycleswith a dominant obliquity component. The strong obliquity signal is reminiscent of the obliquity forcing of Oligocene climate and sea level following the glaciation of Antarctica. The Late Ordovician world analogously experienced glaciation of Gondwana, which straddled the South Pole; this may have involved ice sheet dynamics that generated obliquity-paced sea level oscillations that affected Late Ordovician shorelines worldwide. This Milankovitch-forced glacio-eustatic record from eastern North America joins other suspected Milankovitch-forced successions reported from the Late Ordovician of northern Africa, northwestern Australia, Scandinavia, and northeastern and eastern-central North America.

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Dean, Walter E., and James V. Gardner. "Milankovitch cycles in Neocene deep-sea sediment." Paleoceanography 1, no. 4 (December 1986): 539–53. http://dx.doi.org/10.1029/pa001i004p00539.

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Schwarzacher, W. "Milankovitch cycles and the measurement of time." Terra Nova 1, no. 5 (September 1989): 405–8. http://dx.doi.org/10.1111/j.1365-3121.1989.tb00400.x.

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Short, David A., John G. Mengel, Thomas J. Crowley, William T. Hyde, and Gerald R. North. "Filtering of Milankovitch Cycles by Earth's Geography." Quaternary Research 35, no. 2 (March 1991): 157–73. http://dx.doi.org/10.1016/0033-5894(91)90064-c.

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AbstractEarth's land-sea distribution modifies the temperature response to orbitally induced perturbations of the seasonal insolation. We examine this modification in the frequency domain by generating 800,000-yr time series of maximum summer temperature in selected regions with a linear, two-dimensional, seasonal energy balance climate model. Previous studies have demonstrated that this model has a sensitivity comparable to general circulation models for the seasonal temperature response to orbital forcing on land. Although the observed response in the geologic record is sometimes significantly different than modeled here (differences attributable to model limitations and feedbacks involving the ocean-atmosphere-cryosphere system), there are several results of significance: (1) in mid-latitude land areas the orbital signal is translated linearly into a large (>10°C) seasonal temperature response; (2) although the modeled seasonal response to orbital forcing on Antarctica is 6°C, the annual mean temperature effect (<2°C) is only about one-fifth that inferred from the Vostok ice core, and primarily restricted to periods near 41,000 yr; (3) equatorial regions have the richest spectrum of temperature response, with a 3000-yr phase shift in the precession response, plus some power near periods of 10,000–12,000 yr, 41,000 yr, 100,000 yr, and 400,000 yr. Peaks at 10,000–12,000 yr and 100,000 and 400,000 yr result from the twice-yearly passage of the sun across the equator. The complex model response in equatorial regions has some resemblance to geologic time series from this region. The amplification of model response over equatorial land masses at the 100,000-yr period may explain some of the observed large variance in this band in geologic records, especially in pre-Pleistocene records from times of little or no global ice volume.

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Crampton, James S., Stephen R. Meyers, Roger A. Cooper, Peter M. Sadler, Michael Foote, and David Harte. "Pacing of Paleozoic macroevolutionary rates by Milankovitch grand cycles." Proceedings of the National Academy of Sciences 115, no. 22 (May 14, 2018): 5686–91. http://dx.doi.org/10.1073/pnas.1714342115.

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Periodic fluctuations in past biodiversity, speciation, and extinction have been proposed, with extremely long periods ranging from 26 to 62 million years, although forcing mechanisms remain speculative. In contrast, well-understood periodic Milankovitch climate forcing represents a viable driver for macroevolutionary fluctuations, although little evidence for such fluctuation exists except during the Late Cenozoic. The reality, magnitude, and drivers of periodic fluctuations in macroevolutionary rates are of interest given long-standing debate surrounding the relative roles of intrinsic biotic interactions vs. extrinsic environmental factors as drivers of biodiversity change. Here, we show that, over a time span of 60 million years, between 9 and 16% of the variance in biological turnover (i.e., speciation probability plus species extinction probability) in a major Early Paleozoic zooplankton group, the graptoloids, can be explained by long-period astronomical cycles (Milankovitch “grand cycles”) associated with Earth’s orbital eccentricity (2.6 million years) and obliquity (1.3 million years). These grand cycles modulate climate variability, alternating times of relative stability in the environment with times of maximum volatility. We infer that these cycles influenced graptolite speciation and extinction through climate-driven changes to oceanic circulation and structure. Our results confirm the existence of Milankovitch grand cycles in the Early Paleozoic Era and show that known processes related to the mechanics of the Solar System were shaping marine macroevolutionary rates comparatively early in the history of complex life. We present an application of hidden Markov models to macroevolutionary time series and protocols for the evaluation of statistical significance in spectral analysis.

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Cvijanovic, Ivana, Jelena Lukovic, and James D. Begg. "One hundred years of Milanković cycles." Nature Geoscience 13, no. 8 (July 31, 2020): 524–25. http://dx.doi.org/10.1038/s41561-020-0621-2.

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Deitrick, Russell, Rory Barnes, Thomas R. Quinn, John Armstrong, Benjamin Charnay, and Caitlyn Wilhelm. "Exo-Milankovitch Cycles. I. Orbits and Rotation States." Astronomical Journal 155, no. 2 (January 15, 2018): 60. http://dx.doi.org/10.3847/1538-3881/aaa301.

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Marsh, Gerald E. "Interglacials, Milankovitch Cycles, Solar Activity, and Carbon Dioxide." Journal of Climatology 2014 (September 8, 2014): 1–7. http://dx.doi.org/10.1155/2014/345482.

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The existing understanding of interglacial periods is that they are initiated by Milankovitch cycles enhanced by rising atmospheric carbon dioxide concentrations. During interglacials, global temperature is also believed to be primarily controlled by carbon dioxide concentrations, modulated by internal processes such as the Pacific Decadal Oscillation and the North Atlantic Oscillation. Recent work challenges the fundamental basis of these conceptions.

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Brickman, David, D. G. Wright, and William Hyde. "Filtering of Milankovitch Cycles by the Thermohaline Circulation." Journal of Climate 12, no. 6 (June 1999): 1644–58. http://dx.doi.org/10.1175/1520-0442(1999)012<1644:fomcbt>2.0.co;2.

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Spiegel, David S., Sean N. Raymond, Courtney D. Dressing, Caleb A. Scharf, and Jonathan L. Mitchell. "GENERALIZED MILANKOVITCH CYCLES AND LONG-TERM CLIMATIC HABITABILITY." Astrophysical Journal 721, no. 2 (September 9, 2010): 1308–18. http://dx.doi.org/10.1088/0004-637x/721/2/1308.

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Ainsworth, R. Bruce, Adam J. Vonk, Paul Wellington, and Victorien Paumard. "Out-of-phase cyclical sediment supply: A potential causal mechanism for generating stratigraphic asymmetry and explaining sequence stratigraphic spatial variability." Journal of Sedimentary Research 90, no. 12 (December 31, 2020): 1706–33. http://dx.doi.org/10.2110/jsr.2020.012.

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ABSTRACTAlthough acknowledged to be a simplification, the rate of sediment supply is usually assumed to be constant in sequence stratigraphic interpretations of clastic shelf systems. The simplified assumption taken in this work is that sediment supply can be represented by sine curves linked to climate changes driven by Milankovitch cycles. Three orders of sediment supply sine curves (amplitude and frequency scaled to order) are convolved with three orders of Milankovitch-forced eustatic sea-level sine curves and a constant rate of subsidence to generate curves for the ratio of rate of accommodation development to rate of sediment supply (δ A /δ S ). The relative-sea-level curve is then held constant whilst sediment supply is systematically changed from being constant to being cyclical across the three orders of Milankovitch frequencies and being in-phase, and out-of-phase with the eustatic cycles by 90°, 180°, and 270°. For each scenario, stratal architecture is then represented for sixty consecutive parasequences (fifth-order, regressive–transgressive shelf transit cycles) by converting the δ A /δ S curves into pseudo thickness / sandstone fraction plots (TSF plots). Constant sediment supply, in-phase sediment supply, and 180°-out-of-phase sediment supply produce symmetrical stratal geometries with equal periods of progradation, aggradation, and retrogradation. When sediment-supply cycles are 90°-out-of-phase (supply peak occurs later than sea-level peak), stratal geometries are asymmetrical with progradational architectures being dominant. When sediment-supply cycles are 270°-out-of-phase (supply peak occurs earlier than sea-level peak), stratal geometries are also asymmetrical but retrogradational architectures are dominant. These patterns are reproduced at all three orders of stratigraphic hierarchy (parasequence, sequence, and composite sequence). Comparison of these synthetic stratal geometries to real-world stratal geometries from Triassic to Neogene rocks across both the fifth-order (parasequence) and fourth-order (sequence) of stratal hierarchies suggests a consistently occurring asymmetrical, progradation-dominant motif. This indicates that 90°-out-of-phase sediment supply (supply peak occurs later than sea-level peak) may be a common occurrence through geological time. The work also corroborates the findings of earlier workers and suggests that sequence stratigraphic surfaces can change nature along depositional strike due to out-of-phase sediment supply and can thus also be diachronous. This work conceptually illustrates that Milankovitch climate-change-induced sinusoidal-sediment-supply cycles, out-of-phase with sinusoidal eustatic-sea-level cycles, may produce commonly observed asymmetrical stratal architectures and should be considered when invoking causal mechanisms for stratal architectures on clastic shelves.

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Anderson, R. Y. "Enhanced climate variability in the tropics: a 200 000 yr annual record of monsoon variability from Pangea's equator." Climate of the Past 7, no. 3 (July 19, 2011): 757–70. http://dx.doi.org/10.5194/cp-7-757-2011.

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Abstract. A continuous series of 209 000 evaporite varves from the equator of arid western Pangea (age = −255 ma), as a proxy for surface temperature, has a complete suite of Milankovitch cycles and harmonics as expected for a rectified reaction to precession-modulated insolation at the equator. Included are modes of precession (23.4 kyr, 18.2 kyr), semi-precession (11.7 kyr, 9.4 kyr), and harmonics at ~7 kyr and 5.4 kyr. An oscillation of ~100 kyr, with 35 % of total variance, originates as an amplitude modulation of precession cycles. An exceptionally strong 2.3 kyr quasi-bi-millennial oscillation (QBMO) appears to have had its own source of forcing, possibly solar, with its amplitude enhanced at Milankovitch frequencies. Seasonal information in varves traces the rectifying process to asymmetrical distribution of Pangea relative to the equator, and its effect on monsoonal circulation and heat flow near the equator during summer solstices in the hemispheres.

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Lewis, David F. V., and Jean-Lou C. M. Dorne. "The Astronomical Pulse of Global Extinction Events." Scientific World JOURNAL 6 (2006): 718–26. http://dx.doi.org/10.1100/tsw.2006.156.

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The linkage between astronomical cycles and the periodicity of mass extinctions is reviewed and discussed. In particular, the apparent 26 million year cycle of global extinctions may be related to the motion of the solar system around the galaxy, especially perpendicular to the galactic plane. The potential relevance of Milankovitch cycles is also explored in the light of current evidence for the possible causes of extinction events over a geological timescale.

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Meyers, Stephen R., and Alberto Malinverno. "Proterozoic Milankovitch cycles and the history of the solar system." Proceedings of the National Academy of Sciences 115, no. 25 (June 4, 2018): 6363–68. http://dx.doi.org/10.1073/pnas.1717689115.

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The geologic record of Milankovitch climate cycles provides a rich conceptual and temporal framework for evaluating Earth system evolution, bestowing a sharp lens through which to view our planet’s history. However, the utility of these cycles for constraining the early Earth system is hindered by seemingly insurmountable uncertainties in our knowledge of solar system behavior (including Earth–Moon history), and poor temporal control for validation of cycle periods (e.g., from radioisotopic dates). Here we address these problems using a Bayesian inversion approach to quantitatively link astronomical theory with geologic observation, allowing a reconstruction of Proterozoic astronomical cycles, fundamental frequencies of the solar system, the precession constant, and the underlying geologic timescale, directly from stratigraphic data. Application of the approach to 1.4-billion-year-old rhythmites indicates a precession constant of 85.79 ± 2.72 arcsec/year (2σ), an Earth–Moon distance of 340,900 ± 2,600 km (2σ), and length of day of 18.68 ± 0.25 hours (2σ), with dominant climatic precession cycles of ∼14 ky and eccentricity cycles of ∼131 ky. The results confirm reduced tidal dissipation in the Proterozoic. A complementary analysis of Eocene rhythmites (∼55 Ma) illustrates how the approach offers a means to map out ancient solar system behavior and Earth–Moon history using the geologic archive. The method also provides robust quantitative uncertainties on the eccentricity and climatic precession periods, and derived astronomical timescales. As a consequence, the temporal resolution of ancient Earth system processes is enhanced, and our knowledge of early solar system dynamics is greatly improved.

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Forgan, Duncan. "Milankovitch cycles of terrestrial planets in binary star systems." Monthly Notices of the Royal Astronomical Society 463, no. 3 (August 20, 2016): 2768–80. http://dx.doi.org/10.1093/mnras/stw2098.

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Radivojevic, Dejan. "A hundred years of Milutin Milankovic's climate change theory-geological implications." Annales g?ologiques de la Peninsule balkanique 81, no. 2 (2020): 87–98. http://dx.doi.org/10.2298/gabp201125011r.

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Milankovic?s cycles theory published hundred years ago is the most important theory in climate science and had great influence on Earth disciplines. Nevertheless, his work waited for more than fifty years for confirmation. It could be said that Milankovic?s work had most influence in creation of Astronomic Time Scale, supporting of continental drift hypothesis and palaeoclimatology implications. Positive results of the implementation of the astronomic time scale to the Neogene stratigraphy initiated the application of this method within the Mesozoic, and lately also to the Paleozoic sediments. Milankovic?s manuscript of astronomical forcing of climate changes led to fruitful cooperation with Alfred Wegener who was searching for additional arguments to validate his continental drift hypothesis. The factors that cause climate changes enable insight to the geological past, but also the possibility to model the climate conditions which await us in the future. Climate change prediction allowed people, as only being aware of its influence, to act preventively and take all measurements needed to reduce greenhouse gasses emission.

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Hágen, András. "Astronomical causes of climate change. Milanković–Bacsák cycle and the last ice age." Acta climatologica et chorologica 55, no. 1 (2021): 5–16. http://dx.doi.org/10.14232/acta.clim.2021.55.1.

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György Bacsák, a Hungarian polyhistor, was born 150 years ago and died 50 years ago. He played an important role in refining and further developing the Milanković cycle. Milanković's theory describes the effect of changes in Earth's movements on the climate. The theory came from its creator, Milutin Milanković, a Serbian geophysicist and astronomer. The Serbian scientist was imprisoned in the Austro-Hungarian Monarchy during World War I as a citizen of a hostile state. He developed his theory in the library of the Hungarian Academy of Sciences. Understanding the essence of the theory, György Bacsák enjoyed the theoretical support of Milanković in the form of regular correspondence between 1938 and 1955. In total, György Bacsák wrote 56 letters to Milutin Milanković, while the Serbian scholar wrote 10 letters, all of which can be found in the Library of the Hungarian Academy of Sciences. The language of the letters was German, since both Bacsák and Milanković spoke German fluently. Three articles from György Bacsák, from the year 1940, were published in the Magazine “Weather” and a part of his book “Earth’s history of the last 600,000 years” was published in 1944 both of them were based on this letter exchange.

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Hágen, András. "Astronomical causes of climate change. Milanković–Bacsák cycle and the last ice age." Acta climatologica et chorologica 55, no. 1 (2021): 5–16. http://dx.doi.org/10.14232/acta.clim.2020.55.1.

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György Bacsák, a Hungarian polyhistor, was born 150 years ago and died 50 years ago. He played an important role in refining and further developing the Milanković cycle. Milanković's theory describes the effect of changes in Earth's movements on the climate. The theory came from its creator, Milutin Milanković, a Serbian geophysicist and astronomer. The Serbian scientist was imprisoned in the Austro-Hungarian Monarchy during World War I as a citizen of a hostile state. He developed his theory in the library of the Hungarian Academy of Sciences. Understanding the essence of the theory, György Bacsák enjoyed the theoretical support of Milanković in the form of regular correspondence between 1938 and 1955. In total, György Bacsák wrote 56 letters to Milutin Milanković, while the Serbian scholar wrote 10 letters, all of which can be found in the Library of the Hungarian Academy of Sciences. The language of the letters was German, since both Bacsák and Milanković spoke German fluently. Three articles from György Bacsák, from the year 1940, were published in the Magazine “Weather” and a part of his book “Earth’s history of the last 600,000 years” was published in 1944 both of them were based on this letter exchange.

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Jovanovic, Gordana. "The Influence of Natural Cycles on Climate Change." Modern Environmental Science and Engineering 8, no. 9 (September 8, 2022): 477–82. http://dx.doi.org/10.15341/mese(2333-2581)/09.08.2022/004.

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The influence of natural cycles on the climate of our planet was very successfully and in detail examined by Milutin Milankovitch. He described mathematically precisely how the movement of the Earth around the Sun over long periods of time is reflected in its climate at different latitudes. Modern researches show the existence of some other natural cycles — astronomical, related to the activity of the Sun and its cycles, and terrestrial, related to periodic processes on Earth such as El Niño and La Niña, which also affect the climate. This paper will discuss all these impacts as well as scientific predictions of the further course of climate change in this century. Key words: climate change, cycles, Earth, Sun, solar activity

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Soua, Mohamed. "Time series analysis (orbital cycles) of the uppermost Cenomanian-Lower Turonian sequence on the southern Tethyan margin using foraminifera." Geologica Carpathica 61, no. 2 (April 1, 2010): 111–20. http://dx.doi.org/10.2478/v10096-010-0004-5.

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Time series analysis (orbital cycles) of the uppermost Cenomanian-Lower Turonian sequence on the southern Tethyan margin using foraminiferaTime series analysis has been performed for the first time on the Cenomanian-Turonian sequence in Central Tunisia in order to shed light on its Milankovitch-like cyclicity. This analysis was applied to two foraminiferal genera: the biserialHeterohelix, an oxygen-minimum zone (OMZ) dweller, and the triserialGuembelitria, a eutrophic surface dweller. Average sedimentary rates and the duration of the oceanic anoxic event (OAE2) in each studied section were estimated. The fluctuations in abundance of these two opportunistic species can be related mainly to both precessional (ca. 20 kyr) and eccentricity (100 and 400 kyr) cyclicity suggesting that changes in surface water fertility were linked to climate changes in the Milankovitch frequency band.

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Schwarzacher, Walther. "Milankovitch cycles in the pre-Pleistocene stratigraphic record: a review." Geological Society, London, Special Publications 70, no. 1 (1993): 187–94. http://dx.doi.org/10.1144/gsl.sp.1993.070.01.13.

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Niggemann, Stefan, Augusto Mangini, Manfred Mudelsee, Detlev K. Richter, and Georg Wurth. "Sub-Milankovitch climatic cycles in Holocene stalagmites from Sauerland, Germany." Earth and Planetary Science Letters 216, no. 4 (December 2003): 539–47. http://dx.doi.org/10.1016/s0012-821x(03)00513-2.

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Josso, Pierre, Tim van Peer, Matthew S. A. Horstwood, Paul Lusty, and Bramley Murton. "Geochemical evidence of Milankovitch cycles in Atlantic Ocean ferromanganese crusts." Earth and Planetary Science Letters 553 (January 2021): 116651. http://dx.doi.org/10.1016/j.epsl.2020.116651.

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Schwarzacher, W. "Milankovitch type cycles in the Lower Carboniferous of NW Ireland." Terra Nova 1, no. 5 (September 1989): 468–73. http://dx.doi.org/10.1111/j.1365-3121.1989.tb00412.x.

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Sames, Benjamin, M. Wagreich, C. P. Conrad, and S. Iqbal. "Aquifer-eustasy as the main driver of short-term sea-level fluctuations during Cretaceous hothouse climate phases." Geological Society, London, Special Publications 498, no. 1 (November 19, 2019): 9–38. http://dx.doi.org/10.1144/sp498-2019-105.

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AbstractA review of short-term (<3 myr: c. 100 kyr to 2.4 myr) Cretaceous sea-level fluctuations of several tens of metres indicates recent fundamental progress in understanding the underlying mechanisms for eustasy, both in timing and in correlation. Cretaceous third- and fourth-order hothouse sea-level changes, the sequence-stratigraphic framework, are linked to Milankovitch-type climate cycles, especially the longer-period sequence-building bands of 405 kyr and 1.2 myr. In the absence of continental ice sheets during Cretaceous hothouse phases (e.g. Cenomanian–Turonian), growing evidence indicates groundwater-related sea-level cycles: (1) the existence of Milankovitch-type humid-arid climate oscillations, proven via intense humid weathering records during times of regression and sea-level lowstands; (2) missing or inverse relationships of sea-level and the marine δ18O archives, i.e. the lack of a pronounced positive excursion, cooling signal during sea-level lowstands; and (3) the anti-phase relationship of sea and lake levels, attesting to high groundwater levels and charged continental aquifers during sea-level lowstands. This substantiates the aquifer-eustasy hypothesis. Rates of aquifer-eustatic sea-level change remain hard to decipher; however, reconstructions range from a very conservative minimum estimate of 0.04 mm a−1 (longer time intervals) to 0.7 mm a−1 (shorter, probably asymmetric cycles). Remarkably, aquifer-eustasy is recognized as a significant component for the Anthropocene sea-level budget.

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Rainey, R. C. T. "Long-term changes in the Earth's climate: Milankovitch cycles as an exercise in classical mechanics." American Journal of Physics 90, no. 11 (November 2022): 848–56. http://dx.doi.org/10.1119/10.0013563.

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Long-term changes in the tilt of the Earth's axis, relative to the plane of its orbit, are of great significance to long-term climate change, because they control the size of the arctic and Antarctic circles. These “Milankovitch cycles” have hitherto been calculated by classical perturbation methods or by direct numerical integration of Newton's equations of motion. This paper presents an approximate calculation from simple considerations of angular momentum using similar methods to those used to study the precession of a spinning top. It is an instructive exercise in classical mechanics and gives a simple explanation of the phenomenon in terms of angular momentum. It is shown that the main component of “Milankovitch cycles” has a period of 41,000 yr and is due to one of the modes of precession of the Earth-Venus system. The other mode of this system produces a component of period 29,500 yr, and a third component of period 54,000 yr results from the influence of the precession of the orbits of Jupiter and Saturn. These results agree closely with several of the numerical simulations in the literature and strongly suggest that some other results in the literature are incorrect.

Journal articles on the topic 'Milankovich cycles'

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