Rozprawy doktorskie na temat „Milankovich cycles”
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Hoang, Hoai-Nam. "Long term stability and diffusion in the solar system". Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLO002.
Pełny tekst źródłaBecause the Solar System is chaotic, the orbital evolution of the Earth's orbit beyond 60 Myr cannot be reliably predicted. On the other hand, Earth's orbital variations control insolation which leads to long-term climate change, and were thus imprinted in the geological records. The recovery of this astronomical forcing in geological data has revolutionized the determination of the geological time scales. Taking into account the chaotic uncertainty of the astronomical forcing is necessary for a complete astronomical calibration of geological records. To address this problem, we obtain, benchmark and illustrate the application of probability density functions of the secular frequencies using kernel density estimation, whose uncertainty determined by the moving block bootstrap method.Apart from being chaotic, the inner planets of the Solar System can also be unstable. Despite the lack of apparent constraints that bound the chaotic dynamics, the probability of instability is remarkably low in 5 billion years, especially considering it is 1000 times longer than the Lyapunov time of the system. We attempt to resolve the paradox in this thesis by studying the destabilization in its total complexity of a high dimensional system. As a first step, we provide an exhaustive statistical analysis of instability up to 100 Gyr from a hierarchy of secular models at different degrees in eccentricities and inclinations. We find that the Hamiltonian truncated at degree 4, despite its comprehensiveness, is overly stable and not sufficient to reproduce the instability statistics. This is due to the unexpectedly significant contribution of the terms at degree 6 to the frontier of instability. As a second step, we show that the dynamics of the inner planets over its chaotic timescale is slow-fast with a wide separation of timescales. The first evidence is found in its Lyapunov spectrum, where a hierarchy of characteristic exponents spans two orders of magnitude. The smallest Lyapunov exponents can be related to the slow variables, which vary on a timescale much longer than the Lyapunov time. Concretely, from a systematic analysis of the leading secular resonances, we demonstrate three quasi-symmetries, which define three quasi-integral of motion. By a novel utilization of a traditional statistical method - principal component analysis, we confirm that these quasi-integrals are among the slowest degrees of freedom of the chaotic dynamics. The quasi-integrals constrain the long-term chaotic diffusion of the orbits, thereby slowing down the system in their pathway towards planetary collision
Tierney, Kate. "Milankovitch cycles in the distant past /". Columbus, Ohio : Ohio State University, 2002. http://hdl.handle.net/1811/6109.
Pełny tekst źródłaDitchfield, Peter William. "Milankovitch cycles in Cenomanian chalks of the Anglo-Paris Basin". Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293784.
Pełny tekst źródłaRutherford, Scott David. "Phytoplankton productivity and Milankovitch Cycles in the Cenomanian-Turonian Bridge Creek member of the Greenhorn Formation in southeastern Colorado". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-01102009-063011/.
Pełny tekst źródłaSentenac, Françoise. "Etude de séquences loféritiques en domaine carbonaté : leur signification géodynamique". Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX22055.
Pełny tekst źródłaGiraud, Fabienne. "Recherche des périodicités astronomiques et des fluctuations du niveau marin à partir de l'étude du signal carbonaté des séries pélagiques alternantes : application au crétacé inférieur du Sud-Est de la France (Bassin vocontien)... /". Lyon : Centre des sciences de la Terre, 1995. http://catalogue.bnf.fr/ark:/12148/cb35786572m.
Pełny tekst źródłaBoulila, Slah. "Cyclostratigraphie des séries sédimentaires du Jurassique supérieur (Sud-Est de la France, Nord de la Tunisie) : contrôle astro-climatique, implications géochronologiques et séquentielles". Paris 6, 2008. http://www.theses.fr/2008PA066019.
Pełny tekst źródłaBinyatov, Elnur. "Sedimentological, Cyclostratigraphic Analysis And Reservoir Characterization Of Balakhany X Formation Within The Productive Series Azeri Field On C01 Well (offshore Azerbaijan)". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609628/index.pdf.
Pełny tekst źródłaLiu, Wei. "Influence de la mousson et des changements du niveau marin sur la sédimentation hémipélagique en Mer de Timor au cours des derniers 240 ka". Paris 6, 2011. http://www.theses.fr/2011PA066522.
Pełny tekst źródłaMartinez, Mathieu. "Calibration astronomique du Valanginien et de l'Hauterivien (crétacé inférieur) : Implications paléoclimatiques et paléocéanographiques". Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00906955.
Pełny tekst źródłaHuret, Emilia. "Analyse cyclostratigraphique des variations de la susceptibilité magnétique des argilites callovo-oxfordiennes de l' Est du Bassin de Paris : application à la recherche de hiatus sédimentaires". Paris 6, 2006. http://www.theses.fr/2006PA066471.
Pełny tekst źródłaBonelli, Stefano. "Impact des variations de l'insolation et du CO2 atmosphérique sur l'évolution passée et future des calottes de glace". Versailles-St Quentin en Yvelines, 2009. http://www.theses.fr/2009VERS0054.
Pełny tekst źródłaBetter understanding the Earth’s climate system is a major issue for the scientific community. The climate system is characterized by a high degree of complexity, due to the numerous interactions between its various components (i. E. Atmosphere, oceans, biosphere, lithosphere and cryosphere), operating at different timescales. Furthermore, the anthropogenic pressure has also to be considered in a comprehensive description of the climate system, since it is capable of modifying its state, as well as the amplitude and frequency of the natural variability. The study of past climatic variations represents a primary means to understand the ongoing climate change: on the one hand, it allows direct comparison with previous warm episodes, and, on the other, it is useful to validate climate models for paleo-climatic conditions fully different from the present day ones, yet well-constrained by data-sets. Indeed, the Earth’s climate has always been characterized by changes; the transitions between “cold” states (glacial periods) and “warm” ones (interglacials), and vice versa, have been a major feature of the system for the last three million years. These changes are better known as glacial-interglacial cycles, and their existence is recorded in many climatic archives (i. E. Sea sediments, ice cores, continental records). The main goal of this thesis is to better understand the transition from interglacial periods to glacial ones for different timescales (geological timescale, Milankovitch timescale and future projections), by using a fully coupled climate-ice sheet model. Our work represents a step forward in the study of “low frequency” climate variability. We have tested the model performances for three different case studies, corresponding to different periods of the Earth’s history. The first part of this thesis is focused on the study of the Cenozoic glaciation of Antarctica, which enables us to pinpoint the complex links between atmospheric CO2 concentration, tectonics (i. E. The opening of the Drake Passage), global climate and the inception of the Antarctic ice sheet 34 Ma ago. The second part deals with climate-ice sheets interactions at the Milankovitch timescale, and provides a “transient” simulation of the last glacial-interglacial cycle. Finally, the third part is dedicated to the future ice sheet evolution, focusing on the next glacial inception, and on how this transition might be affected by anthropogenic activity. Our approach covers the range of applicability of the coupled model, thus highlighting its strengths, but also its major limitations, and offers new insights for the ongoing studies on the links between climate and ice sheets
CASTELLTORT, Sébastien. "Origine et modification des cycles stratigraphiques à haute-fréquence (10's à 100's ka). Rôle des déformations courte longueur et modélisation du comportement des systèmes fluviatiles". Phd thesis, Université Rennes 1, 2003. http://tel.archives-ouvertes.fr/tel-00003936.
Pełny tekst źródłaKhodri-Chouchou, Myriam. "Modélisation couplée Océan-Atmosphère-Glace de mer de la réponse climatique aux changements d'insolation du dernier interglaciaire". Paris 6, 2002. http://www.theses.fr/2002PA066420.
Pełny tekst źródłaBregoin, Stéphanie. "Variabilité spatiale et temporelle des caractéristiques du Callovo-Oxfordien de Meuse/Haute-Marne". Paris, ENMP, 2003. http://www.theses.fr/2003ENMP1297.
Pełny tekst źródłaBiljana, Basarin. "Идентификовање и анализа Миланковићевих циклуса записаних у лесно-палеоземљишним секвенцама у Војводини". Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2011. https://www.cris.uns.ac.rs/record.jsf?recordId=82753&source=NDLTD&language=en.
Pełny tekst źródłaLes u Vojvodini ima najveću moćnost i smatra se za najkompletniji paleoklimatski arhiv u Evropi. Na osnovu korealice između dve najznačajnije lesno-paleozemljišne sekvence, Starog Slankamena i Titelskog brega, stvoren je sintetički profil korišćen u ovoj studiji. Istraživanja Markovića i saradnika (2011) pokazala su da lesno-paleozemljišna sekvenca u Starom Slankamenu ima starost od oko milion godina. S druge strane, visoke stope sedimentacije i kompletnost poslednjih pet glacijalno-interglacijalnih ciklusa na Titelskom bregu čine ovaj lokalitet najdetaljnijim paleoklimatskim arhivom u pomenutom periodu, u ovom delu Evrope. Vremenska skala vojvođanskog lesa formirana je tuniranjem rezultata magnetnog susceptibiliteta prema astronomskim parametrima, nagibu Zemljine ose rotacije i precesije. Ovako dobijena vremenska skala pokazuje da je granica između normalne epohe magnetnog polariteta Brines i epohe reversnog polariteta Metujama značajno starija. Ova granica utvrđena je paleomagnetnim merenjima u lesnom horizontu V L9. Dobijeni rezultati stoje u dobroj korelaciji sa rezultatima paleomagnetnih merenja (Marković et al., 2011). "Lock in" efekat utvrđen za vojvođanski les znatno je veći u odnosu na onaj u kineskim lesno-paleozemljišnim sekvencama, zbog snažno razvijenog korenskog sistema čije postojanje je uvrđeno u V S8 i koje se proteže nekoliko metara u dubinu sve do lesnog horizonta V L9. Spektralna i vejvlet analiza vremenske skale vojvođanskog lesa pokazuju prisustvo orbitalnih parametara: ekscentriciteta zemljine orbite, promena nagiba Zemljine ose rotacije i precesije. Dominantne su komponente manjih frekvencija, ekscentriciteta, dok su kraći orbitalni periodi promena nagiba ose rotacije i precesije slabije izraženi. Ovakvi rezultati proističu, pre svega iz činjenice da sintetički profil ima starost od oko milion godina i da se samo donji, stariji deo sekvence može posmatrati kao deo takozvanog 41 ky, kada dominira frekvencija promena nagiba ose rotacije. Vejvlet analiza vremenskog modela pokazuje prisustvo Srednje pleistocene tranzicije, što ukazuje da obitalni uticaj ekscentriciteta postaje dominantan pre oko 650 ky. Rezultati stoje u dobroj korelaciji sa sekvencama sa Kineskog lesnog platoa (Sun et al., 2006)i iz Centralne Azije(Ding et al., 2002), ali takođe i sa dubokomorskim sedimentima (Shackleton, 1990). Zahvaljujući kompletnosti i starosti lesno-paleozemljišne sekvence, omogućeno je istraživanje paleoklimatske evolucije i uticaj orbitalnih parametara na paleoklimatske prilike u ovom delu Evrope. Sekvenca se može posmatrati i kao spojnica između zapadnoevropskih i azijskih lesnih profila, značajna za izučavanje kontinentalne i globalne paleoklimatske evolucije.
Loess in Vojvodinaregion (Northern Serbia) is some of the thickest and most complete in Europe. Synthetic profile was developed based on the interprofile correlation between the two most important loess paleosol sequences, Stari Slankamen and Titel Loess Plateau. Recent study (Marković et al., 2011) showed that loess at Stari Slankamen site spans the last million years. On the other hand, high accumulation rates and the completeness of the last five glacial cycles recorded at Titel Loess Plateau preserve detailed climate proxy archive. Magnetic susceptibility record was tuned to orbital obliquity and precession, thus yielding an improved astronomical time scale for the synthetic loess-paleosol sequence. The time scale indicates much older age for the Bruhnes Matuyama boundary, recorded in loess unit V-L9, whish is in good agreement with the recent results obtained during paleomagnetic measurements (Marković et al., 2011). The lock in effect is much grater than in Chinese loess sequences, due to the strong root channels, which penetrate several meters down through V S8 into V-L9 and probably influence the magnetic properties of the sediments. Spectral and wavelet analysis of tuned magnetic susceptibility record reveal the presence of typical orbital frequencies, corresponding to eccentricity, obliquity and precession. Eccentricity frequencies of solar irradiance are dominant, while relatively short time frame of the investigated profile, since the lower part of sequence can be assigned to the so called 41 ky world. Wavelet analysis reveals the presence of Mid Pleistocene Transition, indicating that the eccentricity parameter becomes dominant from 650 ky. The results are in good agreement with sequences from Chinese Loess Plateau (Sun et al., 2006) and Central Asia (Ding et al., 2002) but also with deep sea sediments (Schackleton, 1990). Spectral and wavlet analysis of tuned magnetic susceptibility record reveal the presence of typical orbital frequencies, corresponding to eccentricity, obliquity and precession. Eccentricity frequencies of solar irradiance are dominant, while relatively short time orbital cycles of obliquity and precession are week. This can be attributed to the time frame of the investigated profile, since the lower part of the sequence can be assigned to the so called 41 ky world.Wavlet analysis reveals the presence of Mid Pleistocene Transition, indicating that the eccentricity parameter becomes dominant from 650 ky. The results are in good agreement with sequences from Chinese Loess Plateau (Sun et al., 2006) and Central Asia (Ding et al., 2002) but also with deep sea sediments (Shackleton, 1990). Due to the completeness and the time frame of studied loess paleosol sequence, the site provides an opportunity for investigating the evolution and climate dynamics in this part of europe. The syntjetic profile can be seen as rare paleoclimate archive that enables the reconstruction of orbital influences over Pannonian Basin and can be seen as link between west European sequences and Asian loess.
Husson, Dorothée. "Vers une calibration astronomique du Crétacé : le cas du Maastrichtien (Crétacé supérieur) et de la limite Crétacé-Paléogène". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00815386.
Pełny tekst źródłaCharbonnier, Guillaume. "Reconstitution paléoclimatique et paléoenvironnementale au Valanginien (~135 Ma, Crétacé inférieur) : vers une meilleure compréhension des processus locaux versus globaux". Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00956584.
Pełny tekst źródłaForkner, Robert Murchison 1977. "Depositional periodicity and the hierarchy of stratigraphic forcing in the Triassic carbonates of the Dolomite Alps, N. Italy". Thesis, 2007. http://hdl.handle.net/2152/23400.
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Flögel, Sascha. "On the influence of precessional Milankovitch cycles on the late cretaceous climate system : comparison of GCM-results, geochemical, and sedimentary proxies for the Western Interior Seaway of North America = Über den Einfluss präzessionaler Milankovitch Zyklen auf das spätkretazische Klimasystem /". 2001. http://e-diss.uni-kiel.de/diss_552/.
Pełny tekst źródła"[87]Sr/[86]Sr variation in north Pacific sediments: A record of the Milankovitch Cycle in the past 3 million years". Thesis, 1999. http://hdl.handle.net/2237/6630.
Pełny tekst źródłaAsahara, Yoshihiro, i 良浩 淺原. "[87]Sr/[86]Sr variation in north Pacific sediments: A record of the Milankovitch Cycle in the past 3 million years". Thesis, 1999. http://hdl.handle.net/2237/6630.
Pełny tekst źródłaFlögel, Sascha [Verfasser]. "On the influence of precessional Milankovitch cycles on the late cretaceous climate system : comparison of GCM-results, geochemical, and sedimentary proxies for the western interior seaway of North America / by Sascha Flögel". 2002. http://d-nb.info/971979928/34.
Pełny tekst źródłaHrnková, Magdalena. "Záznam změn mořské hladiny, cirkulace a disperze sedimentu v hemipelagitech svrchního turonu české křídové pánve". Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-321082.
Pełny tekst źródłaWoodard, Stella C. "Oceanic and atmospheric response to climate change over varying geologic timescales". Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9279.
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