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Articles de revues sur le sujet « Vortice polare »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Cavallo, Steven M., and Gregory J. Hakim. "Composite Structure of Tropopause Polar Cyclones." Monthly Weather Review 138, no. 10 (2010): 3840–57. http://dx.doi.org/10.1175/2010mwr3371.1.

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Abstract Tropopause polar vortices are coherent circulation features based on the tropopause in polar regions. They are a common feature of the Arctic, with typical radii less than 1500 km and lifetimes that may exceed 1 month. The Arctic is a particularly favorable region for these features due to isolation from the horizontal wind shear associated with the midlatitude jet stream, which may destroy the vortical circulation. Intensification of cyclonic tropopause polar vortices is examined here using an Ertel potential vorticity framework to test the hypothesis that there is an average tendenc

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Guendelman, Ilai, Darryn W. Waugh, and Yohai Kaspi. "Dynamical Regimes of Polar Vortices on Terrestrial Planets with a Seasonal Cycle." Planetary Science Journal 3, no. 4 (2022): 94. http://dx.doi.org/10.3847/psj/ac54b6.

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Abstract Polar vortices are common planetary-scale flows that encircle the pole in the middle or high latitudes and are observed in most of the solar system’s planetary atmospheres. The polar vortices on Earth, Mars, and Titan are dynamically related to the mean meridional circulation and exhibit a significant seasonal cycle. However, the polar vortex’s characteristics vary between the three planets. To understand the mechanisms that influence the polar vortex’s dynamics and dependence on planetary parameters, we use an idealized general circulation model with a seasonal cycle in which we vary

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Guendelman, Ilai, Darryn W. Waugh, and Yohai Kaspi. "Dynamical Regimes of Polar Vortices on Terrestrial Planets with a Seasonal Cycle." Planetary Science Journal 3, no. 4 (2022): 94. http://dx.doi.org/10.3847/psj/ac54b6.

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Abstract Polar vortices are common planetary-scale flows that encircle the pole in the middle or high latitudes and are observed in most of the solar system’s planetary atmospheres. The polar vortices on Earth, Mars, and Titan are dynamically related to the mean meridional circulation and exhibit a significant seasonal cycle. However, the polar vortex’s characteristics vary between the three planets. To understand the mechanisms that influence the polar vortex’s dynamics and dependence on planetary parameters, we use an idealized general circulation model with a seasonal cycle in which we vary

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Shultis, Jacob, William Seviour, Darryn Waugh, and Anthony Toigo. "Transport and Mixing in Planetary Polar Vortices with Annular and Monopolar Potential Vorticity Structures." Planetary Science Journal 6, no. 3 (2025): 63. https://doi.org/10.3847/psj/adba4b.

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Abstract Polar vortices are a common feature in the solar system, but their structure varies between planets. Although polar vortices are characterized by a coherent region of high potential vorticity (PV) in the polar regions, the meridional variation of PV ranges from strong monopolar to annular distributions. The reduced stability of an annular vortex compared to a monopolar vortex may lead to increased horizontal transport between the midlatitudes and the poles, but this has yet to be thoroughly investigated. Here we perform such an investigation by quantifying the horizontal mixing in pol

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Waugh, Darryn W., Adam H. Sobel, and Lorenzo M. Polvani. "What Is the Polar Vortex and How Does It Influence Weather?" Bulletin of the American Meteorological Society 98, no. 1 (2017): 37–44. http://dx.doi.org/10.1175/bams-d-15-00212.1.

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Abstract The term polar vortex has become part of the everyday vocabulary, but there is some confusion in the media, general public, and science community regarding what polar vortices are and how they are related to various weather events. Here, we clarify what is meant by polar vortices in the atmospheric science literature. It is important to recognize the existence of two separate planetary-scale circumpolar vortices: one in the stratosphere and the other in the troposphere. These vortices have different structures, seasonality, dynamics, and impacts on extreme weather. The tropospheric vo

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Shultis, J., D. W. Waugh, A. D. Toigo, C. E. Newman, N. A. Teanby, and J. Sharkey. "Winter Weakening of Titan's Stratospheric Polar Vortices." Planetary Science Journal 3, no. 4 (2022): 73. http://dx.doi.org/10.3847/psj/ac5ea1.

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Abstract Polar vortices are a prominent feature in Titan's stratosphere. The Cassini mission has provided a detailed view of the breakdown of the northern polar vortex and formation of the southern vortex, but the mission did not observe the full annual cycle of the evolution of the vortices. Here we use a TitanWRF general circulation model simulation of an entire Titan year to examine the full annual cycle of the polar vortices. The simulation reveals a winter weakening of the vortices, with a clear minimum in polar potential vorticity and midlatitude zonal winds between winter solstice and s

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7

Dawber, Matthew. "Balancing polar vortices and stripes." Nature Materials 16, no. 10 (2017): 971–72. http://dx.doi.org/10.1038/nmat4962.

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Roscoe, H. K. "Measuring air from polar vortices." Nature 350, no. 6315 (1991): 197–98. http://dx.doi.org/10.1038/350197c0.

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BUSH, JOHN W. M., and ANDREW W. WOODS. "Vortex generation by line plumes in a rotating stratified fluid." Journal of Fluid Mechanics 388 (June 10, 1999): 289–313. http://dx.doi.org/10.1017/s0022112099004759.

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We present the results of an experimental investigation of the generation of coherent vortical structures by buoyant line plumes in rotating fluids. Both uniform and stratified ambients are considered. By combining the scalings describing turbulent plumes and geostrophically balanced vortices, we develop a simple model which predicts the scale of the coherent vortical structures in excellent accord with laboratory experiments.We examine the motion induced by a constant buoyancy flux per unit length B, released for a finite time ts, from a source of length L into a fluid rotating with angular s

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10

Garcia, Ferran, Frank R. N. Chambers, and Anna L. Watts. "Deep model simulation of polar vortices in gas giant atmospheres." Monthly Notices of the Royal Astronomical Society 499, no. 4 (2020): 4698–715. http://dx.doi.org/10.1093/mnras/staa2962.

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ABSTRACT The Cassini and Juno probes have revealed large coherent cyclonic vortices in the polar regions of Saturn and Jupiter, a dramatic contrast from the east–west banded jet structure seen at lower latitudes. Debate has centred on whether the jets are shallow, or extend to greater depths in the planetary envelope. Recent experiments and observations have demonstrated the relevance of deep convection models to a successful explanation of jet structure, and cyclonic coherent vortices away from the polar regions have been simulated recently including an additional stratified shallow layer. He

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Li, Qian, Vladimir A. Stoica, Marek Paściak, et al. "Subterahertz collective dynamics of polar vortices." Nature 592, no. 7854 (2021): 376–80. http://dx.doi.org/10.1038/s41586-021-03342-4.

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Waugh, D. W., A. D. Toigo, S. D. Guzewich, S. J. Greybush, R. J. Wilson, and L. Montabone. "Martian polar vortices: Comparison of reanalyses." Journal of Geophysical Research: Planets 121, no. 9 (2016): 1770–85. http://dx.doi.org/10.1002/2016je005093.

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Toigo, A. D., D. W. Waugh, and S. D. Guzewich. "What causes Mars' annular polar vortices?" Geophysical Research Letters 44, no. 1 (2017): 71–78. http://dx.doi.org/10.1002/2016gl071857.

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14

Waugh, Darry N. W. "Elliptical diagnostics of stratospheric polar vortices." Quarterly Journal of the Royal Meteorological Society 123, no. 542 (1997): 1725–48. http://dx.doi.org/10.1002/qj.49712354213.

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BULZAN, George Andrei, Roxana REBIGAN, and Mihai KUSKO. "Separation of Different Orbital Angular Momentum Photon States with Log-pol Transformation." Romanian Journal of Information Science and Technology 28, no. 2 (2025): 173–84. https://doi.org/10.59277/romjist.2025.2.05.

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An optical vortex undergoing a logarithmic – polar transformation is unwrapped from a ring – like shape to a straight line segment whose tilt is determined by the order of the vortex. Due to this property, components with continuous optical surface performing logarithmic – polar transformation are employed for the optical vortices sorting as a function of their orders. In this work we show that a logarithmic – polar component with its optical surface approximated by four discrete levels performs with a good approximation the same transformation of the optical vortices.

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O’Neill, Morgan E., Kerry A. Emanuel, and Glenn R. Flierl. "Weak Jets and Strong Cyclones: Shallow-Water Modeling of Giant Planet Polar Caps." Journal of the Atmospheric Sciences 73, no. 4 (2016): 1841–55. http://dx.doi.org/10.1175/jas-d-15-0314.1.

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Abstract Giant planet tropospheres lack a solid, frictional bottom boundary. The troposphere instead smoothly transitions to a denser fluid interior below. However, Saturn exhibits a hot, symmetric cyclone centered directly on each pole, bearing many similarities to terrestrial hurricanes. Transient cyclonic features are observed at Neptune’s South Pole as well. The wind-induced surface heat exchange mechanism for tropical cyclones on Earth requires energy flux from a surface, so another mechanism must be responsible for the polar accumulation of cyclonic vorticity on giant planets. Here it is

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17

Boatto, Stefanella, and Carles Simó. "A vortex ring on a sphere: the case of total vorticity equal to zero." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2158 (2019): 20190019. http://dx.doi.org/10.1098/rsta.2019.0019.

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The stability of a ring of vortices has attracted the interest of researchers for over a century. Recent beautiful observations of polygonal configurations of vortices present in the atmospheres of Jupiter and Saturn, and of polygonal jets in the Earth's atmosphere, have revived the interest in the subject. In the observed cases, the vortex ring is in the presence of a central vortex. We present analytical and numerical results about the linear, spectral and Lyapunov stability of a ring in the presence of polar vortices. Motivated by both atmospheric observations we considered the special case

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18

Bray, Matthew T., and Steven M. Cavallo. "Characteristics of long-track tropopause polar vortices." Weather and Climate Dynamics 3, no. 1 (2022): 251–78. http://dx.doi.org/10.5194/wcd-3-251-2022.

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Abstract. Tropopause polar vortices (TPVs) are closed circulations centered on the tropopause that form and predominately reside in high latitudes. Due to their attendant flow, TPVs have been shown to influence surface weather features, and thus, a greater understanding of the dynamics of these features may improve our ability to forecast impactful weather events. In this study, we focus on the subset of TPVs that have lifetimes of longer than 2 weeks (the 95th percentile of all TPV cases between 1979 and 2018); these long-lived vortices offer a unique opportunity to study the conditions under

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19

Liu, Liying, Zelin An, Ruzhi Wang, et al. "Atomic-scale polar vortices in Na0.5Bi0.5TiO3 grains." Ceramics International 48, no. 8 (2022): 11830–35. http://dx.doi.org/10.1016/j.ceramint.2022.01.053.

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20

Waugh, Darryn W., William J. Randel, Steven Pawson, Paul A. Newman, and Eric R. Nash. "Persistence of the lower stratospheric polar vortices." Journal of Geophysical Research: Atmospheres 104, no. D22 (1999): 27191–201. http://dx.doi.org/10.1029/1999jd900795.

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Zuev, V. V., and E. S. Savelieva. "Dynamic characteristics of the stratospheric polar vortices." Doklady Rossijskoj akademii nauk. Nauki o Zemle 517, no. 1 (2024): 160–70. https://doi.org/10.31857/s2686739724070173.

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The dynamic characteristics of the stratospheric polar vortices at levels from 100 to 1 hPa (minimum vortex area, minimum mean wind speed along the vortex edge, and minimum wind speed at which there is a dynamic barrier), obtained using the vortex delineation method with geopotential based on ERA5 reanalysis data, presented for the first time. Seasonal changes and average winter vertical profiles of the vortex area, mean wind speed along the vortex edge, and mean temperature inside the vortex for the Antarctic and Arctic polar vortices were obtained. The average daily probability of weakening

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22

Yadav, A. K., C. T. Nelson, S. L. Hsu, et al. "Observation of polar vortices in oxide superlattices." Nature 530, no. 7589 (2016): 198–201. http://dx.doi.org/10.1038/nature16463.

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23

Ramesh, R. "Observation of Polar Vortices in Oxide Superlattices." Microscopy and Microanalysis 22, S3 (2016): 1246–47. http://dx.doi.org/10.1017/s1431927616007078.

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Gimeno, Luis, Laura de la Torre, Raquel Nieto, David Gallego, Pedro Ribera, and Ricardo García-Herrera. "A new diagnostic of stratospheric polar vortices." Journal of Atmospheric and Solar-Terrestrial Physics 69, no. 15 (2007): 1797–812. http://dx.doi.org/10.1016/j.jastp.2007.07.013.

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Brueshaber, Shawn R., Kunio M. Sayanagi, and Timothy E. Dowling. "Dynamical regimes of giant planet polar vortices." Icarus 323 (May 2019): 46–61. http://dx.doi.org/10.1016/j.icarus.2019.02.001.

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26

Zuev, V. V., E. A. Maslennikova, and E. S. Savelieva. "Influence of the Quasi-Biennial Oscillation on the Dynamics of the Stratospheric Polar Vortices According to Satellite Observations." Исследования Земли из космоса 2023, no. 5 (2023): 36–44. http://dx.doi.org/10.31857/s0205961423050093.

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The duration of polar ozone depletion events depends on the phase of the quasi-biennial oscillation (QBO). The QBO determines the location of the subtropical critical wind line that influences the propagation of planetary waves into the stratosphere. As a result, the polar vortex intensifies during the western phase of the QBO and weakens during the eastern phase, which manifests itself in the timing, duration, and intensity of stratospheric ozone depletion. Polar ozone depletion occurs inside the strong polar vortex from late winter to spring due to the occurrence of heterogeneous and photoch

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27

Goncharov, V., and V. Pavlov. "Cyclostrophic vortices in polar regions of rotating planets." Nonlinear Processes in Geophysics 8, no. 4/5 (2001): 301–11. http://dx.doi.org/10.5194/npg-8-301-2001.

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Abstract. Multi-petal, rotating vortices can form in two-dimensional flows consisting of an inviscid incompressible fluid under certain conditions. Such vortices are principally nonlinear thermo-hydrodynamical structures. The proper rotation of these structures which leads to time-dependent variations of the associated temperature field can be enregistred by a stationary observer. The problem is analyzed in the framework of the contour dynamics method (CDM). An analytical solution of the reduced equation for a contour curvature is found. We give a classification of the solutions and compare th

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Fuda, Nguyen, and Dániel Apai. "The Polar Vortex Hypothesis: Evolving, Spectrally Distinct Polar Regions Explain Short- and Long-term Light-curve Evolution and Color–Inclination Trends in Brown Dwarfs and Giant Exoplanets." Astrophysical Journal Letters 975, no. 2 (2024): L32. http://dx.doi.org/10.3847/2041-8213/ad87e9.

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Abstract Recent studies revealed viewing-angle-dependent color and spectral trends in brown dwarfs, as well as long-term photometric variability (∼100 hr). The origins of these trends are yet unexplained. Here, we propose that these seemingly unrelated sets of observations stem from the same phenomenon: the polar regions of brown dwarfs and directly imaged exoplanets are spectrally different from lower-latitude regions, and they evolve over longer timescales, possibly driven by polar vortices. We explore this hypothesis via a spatiotemporal atmosphere model capable of simulating time series an

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Coy, Lawrence, Paul A. Newman, William M. Putman, Steven Pawson, and M. Joan Alexander. "Gravity Wave–Induced Instability of the Stratospheric Polar Vortex Edge." Journal of the Atmospheric Sciences 81, no. 11 (2024): 1999–2013. http://dx.doi.org/10.1175/jas-d-24-0005.1.

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Abstract We report on a previously undocumented process capable of mixing the Northern Hemisphere (NH) winter Ertel potential vorticity (EPV)—instabilities introduced along the stratospheric polar vortex edge by breaking gravity waves (GWs). As horizontal resolution has increased, global-scale atmospheric models and data assimilation systems (DASs) are now able to capture some aspects of GW generation, propagation, and dissipation, as well as mesoscale EPV disturbances. This work examines resolved GWs, their breaking, and their interaction with the stratospheric polar vortex as seen in the NAS

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Izhovkina, N.I., S.N. Artekha, N.S. Erokhin, and L.A. Mikhailovskaya. "Influence of Cosmic Ray Invasions and Aerosol Plasma on Powerful Atmospheric Vortices." Physical Science International Journal 23(2) (September 19, 2019): 1–13. https://doi.org/10.9734/psij/2019/v23i230152.

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The Earth’s atmosphere is affected by various ionizing sources. The maximum ionization of atmospheric particles by cosmic rays corresponds to the altitude of formation of tropospheric clouds. In the high-latitude troposphere for the region of the geomagnetic polar cap, in the winter period, the excitation of local cyclonic structures are observed which are accompanied with ice storms, with invasions into middle and subtropical latitudes. The time of excitation of such cyclones is about a day that is comparable with the time of excitation of tornadoes, which are generated at low latitudes

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Constantin, Adrian, Darren G. Crowdy, Vikas S. Krishnamurthy, and Miles H. Wheeler. "Stuart-type polar vortices on a rotating sphere." Discrete & Continuous Dynamical Systems - A 41, no. 1 (2021): 201–15. http://dx.doi.org/10.3934/dcds.2020263.

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Dritschel, David G. "Ring Configurations of Point Vortices in Polar Atmospheres." Regular and Chaotic Dynamics 26, no. 5 (2021): 467–81. http://dx.doi.org/10.1134/s1560354721050026.

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Harvey, V. Lynn, Cora E. Randall, Erich Becker, et al. "Evaluation of the Mesospheric Polar Vortices in WACCM." Journal of Geophysical Research: Atmospheres 124, no. 20 (2019): 10626–45. http://dx.doi.org/10.1029/2019jd030727.

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Watanabe, Shun-ichi I., and Hiroshi Niino. "Genesis and Development Mechanisms of a Polar Mesocyclone over the Japan Sea." Monthly Weather Review 142, no. 6 (2014): 2248–70. http://dx.doi.org/10.1175/mwr-d-13-00226.1.

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Abstract A polar mesocyclone (PMC) observed over the Japan Sea on 30 December 2010 was studied using a nonhydrostatic mesoscale numerical model with a horizontal resolution of 2 km. The numerical simulation successfully reproduced the observed life cycle of the PMC. The results of the numerical simulation suggest that the life cycle of the PMC may be divided into three stages: an early development stage, in which a number of small vortices appear in a shear zone; a late development stage, which is characterized by the merger of vortices and the formation of a few larger vortices; and a mature

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Tsang, Chi Shing, Xiaodong Zheng, Tong Yang, et al. "Polar and quasicrystal vortex observed in twisted-bilayer molybdenum disulfide." Science 386, no. 6718 (2024): 198–205. http://dx.doi.org/10.1126/science.adp7099.

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We report the observation of an electric field in twisted-bilayer molybdenum disulfide (MoS 2 ) and elucidate its correlation with local polar domains using four-dimensional scanning transmission electron microscopy (4D-STEM) and first-principles calculations. We reveal the emergence of in-plane topological vortices within the periodic moiré patterns for both commensurate structures at small twist angles and the incommensurate quasicrystal structure that occurs at a 30° twist. The large-angle twist leads to mosaic chiral vortex patterns with tunable characteristics. A twisted quasicrystal bila

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Scott, R. K., and D. G. Dritschel. "Vortex–Vortex Interactions in the Winter Stratosphere." Journal of the Atmospheric Sciences 63, no. 2 (2006): 726–40. http://dx.doi.org/10.1175/jas3632.1.

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Abstract This paper examines the interaction of oppositely signed vortices in the compressible (non-Boussinesq) quasigeostrophic system, with a view to understanding vortex interactions in the polar winter stratosphere. A series of simplifying approximations leads to a two-vortex system whose dynamical properties are determined principally by two parameters: the ratio of the circulation of the vortices and the vertical separation of their centroids. For each point in this two-dimensional parameter space a family of equilibrium solutions exists, further parameterized by the horizontal separatio

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Susarla, Sandhya, Shanglin Hsu, Piush Behera, et al. "Probing Three-dimensional Chiral Domain Walls in Polar Vortices." Microscopy and Microanalysis 28, S1 (2022): 1770–71. http://dx.doi.org/10.1017/s1431927622007000.

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Yadav, A. K., C. T. Nelson, S. L. Hsu, et al. "Erratum: Corrigendum: Observation of polar vortices in oxide superlattices." Nature 534, no. 7605 (2016): 138. http://dx.doi.org/10.1038/nature17420.

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Cavallo, Steven M., and Gregory J. Hakim. "Radiative Impact on Tropopause Polar Vortices over the Arctic." Monthly Weather Review 140, no. 5 (2012): 1683–702. http://dx.doi.org/10.1175/mwr-d-11-00182.1.

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Abstract Tropopause polar vortices (TPVs) are commonly observed, coherent circulation features of the Arctic with typical radii as large as approximately 800 km. Intensification of cyclonic TPVs has been shown to be dominated by infrared radiation. Here the hypothesis is tested that while radiation alone may not be essential for TPV genesis, radiation has a substantial impact on the long-term population characteristics of cyclonic TPVs. A numerical model is used to derive two 10-yr climatologies of TPVs for both winter and summer: a control climatology with radiative forcing and an experimenta

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Garfinkel, Chaim I., Dennis L. Hartmann, and Fabrizio Sassi. "Tropospheric Precursors of Anomalous Northern Hemisphere Stratospheric Polar Vortices." Journal of Climate 23, no. 12 (2010): 3282–99. http://dx.doi.org/10.1175/2010jcli3010.1.

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Abstract Regional extratropical tropospheric variability in the North Pacific and eastern Europe is well correlated with variability in the Northern Hemisphere wintertime stratospheric polar vortex in both the ECMWF reanalysis record and in the Whole Atmosphere Community Climate Model. To explain this correlation, the link between stratospheric vertical Eliassen–Palm flux variability and tropospheric variability is analyzed. Simple reasoning shows that variability in the North Pacific and eastern Europe can deepen or flatten the wintertime tropospheric stationary waves, and in particular its w

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Guzewich, Scott D., A. D. Toigo, and D. W. Waugh. "The effect of dust on the martian polar vortices." Icarus 278 (November 2016): 100–118. http://dx.doi.org/10.1016/j.icarus.2016.06.009.

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Watanabe, Shun-ichi I., Hiroshi Niino, and Wataru Yanase. "Climatology of Polar Mesocyclones over the Sea of Japan Using a New Objective Tracking Method." Monthly Weather Review 144, no. 7 (2016): 2503–15. http://dx.doi.org/10.1175/mwr-d-15-0349.1.

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Abstract Polar mesocyclones (PMCs) are mesoscale cyclonic vortices that develop poleward of the main polar front. This article reports on a new algorithm for the objective tracking of PMCs, including meso-β-scale vortices, which will facilitate the study of their climatology. The algorithm is based mainly on the vorticity field and consists of three parts: the identification of vortices, the connection of vortices at consecutive time steps, and discrimination between PMCs and synoptic-scale disturbances. The objective tracking method was applied to Mesoscale Analysis (MA) data provided by the

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Günther, G., and M. Dameris. "Air mass exchange across the polar vortex edge during a simulated major stratospheric warming." Annales Geophysicae 13, no. 7 (1995): 745–56. http://dx.doi.org/10.1007/s00585-995-0745-0.

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Abstract. The dynamics of the polar vortex in winter and spring play an important role in explaining observed low ozone values. A quantification of physical and chemical processes is necessary to obtain information about natural and anthropogenic causes of fluctuations of ozone. This paper aims to contribute to answering the question of how permeable the polar vortex is. The transport into and out of the vortex ("degree of isolation") remains the subject of considerable debate. Based on the results of a three-dimensional mechanistic model of the middle atmosphere, the possibility of exchange o

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FORD, RUPERT, and STEFAN G. LLEWELLYN SMITH. "Scattering of acoustic waves by a vortex." Journal of Fluid Mechanics 386 (May 10, 1999): 305–28. http://dx.doi.org/10.1017/s0022112099004371.

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We investigate the scattering of a plane acoustic wave by an axisymmetric vortex in two dimensions. We consider vortices with localized vorticity, arbitrary circulation and small Mach number. The wavelength of the acoustic waves is assumed to be much longer than the scale of the vortex. This enables us to define two asymptotic regions: an inner, vortical region, and an outer, wave region. The solution is then developed in the two regions using matched asymptotic expansions, with the Mach number as the expansion parameter. The leading-order scattered wave field consists of two components. One c

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Cavallo, Steven M., and Gregory J. Hakim. "Potential Vorticity Diagnosis of a Tropopause Polar Cyclone." Monthly Weather Review 137, no. 4 (2009): 1358–71. http://dx.doi.org/10.1175/2008mwr2670.1.

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Abstract Long-lived coherent vortices located near the tropopause are often found over polar regions. Although these vortices are a commonly observed feature of the Arctic, and can have lifetimes longer than one month, little is known about the mechanisms that control their evolution. This paper examines mechanisms of intensity change for a cyclonic tropopause polar vortex (TPV) using an Ertel potential vorticity (EPV) diagnostic framework. Results from a climatology of intensifying cyclonic TPVs suggest that the essential dynamics are local to the vortex, rather than a consequence of larger-s

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Ball, E. R., W. J. M. Seviour, and D. M. Mitchell. "The Importance of Isentropic Mixing in the Formation of the Martian Polar Layered Deposits." Planetary Science Journal 4, no. 11 (2023): 213. http://dx.doi.org/10.3847/psj/ad045d.

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Abstract Layers of ice and dust at the poles of Mars reflect variations in orbital parameters and atmospheric processes throughout the planet's history and may provide a key to understanding Mars's climate record. Previous research has investigated transport changes into the polar regions and found a nonlinear response to obliquity that suggests that Mars may currently be experiencing a maximum in transport across the winter poles. The thickness and composition of layers within the polar layered deposits (PLDs) are likely influenced by changes in horizontal atmospheric mixing at the poles, whi

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Henderson, G. S., J. C. McConnell, S. R. Beagley, and W. F. J. Evans. "Polar ozone depletion: Current status." Canadian Journal of Physics 69, no. 8-9 (1991): 1110–22. http://dx.doi.org/10.1139/p91-170.

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Rapid springtime depletion of column ozone (O3) is observed over the Antarctic during the austral spring. A much weaker springtime depletion is observed in the Arctic region. This depletion results from a complex chemical mechanism that involves the catalytic destruction of stratospheric ozone by chlorine. The chemical mechanism appears to operate between ~12–25 km in the colder regions of the polar winter vortices. During the polar night heterogeneous chemical reactions occur on the surface of polar stratospheric clouds that convert relatively inert reservoir Cl species such as HCl to active

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Waugh, Darryn W., and William J. Randel. "Climatology of Arctic and Antarctic Polar Vortices Using Elliptical Diagnostics." Journal of the Atmospheric Sciences 56, no. 11 (1999): 1594–613. http://dx.doi.org/10.1175/1520-0469(1999)056<1594:coaaap>2.0.co;2.

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Waugh, Darryn W. "Subtropical stratospheric mixing linked to disturbances in the polar vortices." Nature 365, no. 6446 (1993): 535–37. http://dx.doi.org/10.1038/365535a0.

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Salmelin, R. H., and M. M. Salomaa. "Ion mobility along superfluid vortices with polar cores ion3He-A." Journal of Physics C: Solid State Physics 20, no. 27 (1987): L689—L695. http://dx.doi.org/10.1088/0022-3719/20/27/003.

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