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Littérature scientifique sur le sujet « Vortice polare »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Vortice polare"

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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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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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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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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Thèses sur le sujet "Vortice polare"

Ventrucci, Chiara. "Impatto dell'Indian Ocean Dipole sul vortice polare stratosferico." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23889/.

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L’Indian Ocean Dipole (IOD) è un modo di variabilità dell’Oceano Indiano, caratterizzato dalla fluttuazione interannuale dell’intensità della componente zonale del gradiente di temperatura superficiale dell’oceano. Questo modo di variabilità è intimamente connesso con El Niño Southern Oscillation (ENSO) fenomeno noto per i suoi impatti globali sull’atmosfera e sul clima di superficie. IOD e ENSO generano teleconnessioni con effetti diversi in atmosfera. Alcune di queste possono raggiungere anche la stratosfera terrestre, alterando, all’inizio della stagione fredda, l’intensità del vortice pola

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HAMOUDA, MOSTAFA ESSAM ABDELRAHMAN. "LARGE SCALE DRIVERS OF EXTREME PRECIPITATION VARIABILITY IN EUROPE." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/314175.

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È noto che le precipitazioni invernali europee sono ben stimate nei dati di rianalisi e nelle simulazioni dai modelli dato che sono altamente correlate con modi con variabilità su larga scala e a bassa frequenza come l'oscillazione del Nord Atlantico (NAO) e l'oscillazione artica (AO). Dal momento che NAO e AO sono principalmente modi di variabilità invernale, la capacità di stimare le precipitazioni è più limitata nelle altre stagioni, soprattutto in estate, in cui (quando) le precipitazioni sono principalmente dovute alla convezione a mesoscala. La prima parte dello studio utilizza dati osse

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Rong, Ping-ping. "The breakup of stratospheric polar vortices." Available to US Hopkins community, 2003. http://wwwlib.umi.com/dissertations/dlnow/3080755.

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Watson, Peter Alan Gazzi. "The influence of the quasi-biennial oscillation on the stratospheric polar vortices." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:e35d4833-8368-4101-b1fb-17b68c716ae0.

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The mean strengths of the wintertime stratospheric polar vortices are known to be related to the phase of the quasi-biennial oscillation (QBO) in the tropical stratosphere from circulation statistics - the "Holton-Tan relationship". The principal topic of this thesis is improving understanding of the mechanism behind the QBO's influence. Following the example of previous studies, the QBO influence on the Northern Hemisphere (NH) extratropics on monthly time scales in an observational reanalysis is examined, and is shown to closely resemble the stratospheric Northern annular mode (NAM). It is a

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Harvey, V. Lynn. "An object oriented climatology of stratospheric polar vortices and anticyclones." 2001. http://www.library.wisc.edu/databases/connect/dissertations.html.

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Beles, Michael J. "Patterns of the synoptic environment for the development and growth of polar lows and mesoscale vortices." 1997. http://catalog.hathitrust.org/api/volumes/oclc/37427952.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1997.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 124-127).

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Cosgrove, JM. "Numerical simulations of evolving atmospheric vortices using ‘tangent plane’ approximations." Thesis, 2017. https://eprints.utas.edu.au/23969/1/Cosgrove_whole_thesis.pdf.

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Numerical simulations of evolving atmospheric phenomena are considered. The height of the vortices is small with respect to their width and depending on the atmospheric phenomenon being considered can have a diameter of hundreds if not thousands of kilometres. They can therefore be thought of as large flat structures in a shallow atmosphere. A weakly compressible atmosphere is assumed for both Earth-bound and Saturn simulations. The atmospheric fluid motion is subject to the Coriolis pseudo-force, due to atmospheres being in a non-inertial rotating reference frame. The simulations involve redu

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[Verfasser], Thiranan Sonkaew. "Quantification of the chemical ozone loss in the northern and southern polar vortices using SCIAMACHY limb measurements / von Thiranan Sonkaew." 2010. http://d-nb.info/1000477673/34.

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Livres sur le sujet "Vortice polare"

artnoose. Ker-bloom!: Polar vortices. the author, 2014.

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Chapitres de livres sur le sujet "Vortice polare"

Waugh, Darryn W., and Lorenzo M. Polvani. "Stratospheric polar vortices." In The Stratosphere: Dynamics, Transport, and Chemistry. American Geophysical Union, 2010. http://dx.doi.org/10.1029/2009gm000887.

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Salje, E. K. H., and G. Lu. "Introduction to Domain Boundary Engineering." In Domain Walls. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862499.003.0005.

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This chapter introduces research on functional domain boundaries. Ever since the discovery of superconducting twin boundaries in the 1990s, highly conducting, polar, photovoltaic, magnetic, and so on, domain boundaries have been discovered while the same bulk material displays none of these properties. Domain boundaries constitute planar templates for device applications with thicknesses of ca. 1 nm. Domains within domains are then the next step in miniaturization with Bloch lines within domain walls and Bloch points between Bloch lines. In the overwhelming majority of cases, the geometrical t

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Kresin, Vladimir Z., Sergei G. Ovchinnikov, and Stuart A. Wolf. "Properties: Spectroscopy." In Superconducting State. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198845331.003.0003.

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This chapter focuses on the spectroscopy of the superconducting state. Various manifestations of macroscopic quantisation are described, including flux quantisation, the Josephson effect, vortices, and the Little–Parks effect. The Ginzburg–Landau theory and its microscopic derivation are presented. An interesting new direction, the search for the lossless ground current state, undergoes an intensive development. If the electronic density of states contains several peaks, it manifests as a multigap structure. Impurity scattering and, especially, the pair-breaking effect can drastically affect t

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Tuck, Adrian F. "Generalized Scale Invariance." In Atmospheric Turbulence. Oxford University Press, 2008. http://dx.doi.org/10.1093/oso/9780199236534.003.0007.

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Probability distributions plotted to date from large volumes of high quality atmospheric observations invariably have ‘long tails’: relatively rare but intense events make significant contributions to the mean. Atmospheric fields are intermittent. Gaussian distributions, which are assumed to accompany second moment statistics and power spectra, are not seen. An inherently stochastic approach, that of statistical multifractals, was developed as generalized scale invariance by Schertzer and Lovejoy (1985, 1987, 1991); it incorporates intermittency and anisotropy in a way Kolmogorov theory does n

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Actes de conférences sur le sujet "Vortice polare"

Chen, Y. N., U. Seidel, J. Chen, U. Haupt, and M. Rautenberg. "Experimental Investigation of the Flow Field of Deep Rotating Stall in a Centrifugal Compressor." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-160.

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The pressure field of deep rotating stall of a centrifugal compressor with two stall cells is analysed by means of the two-dimensional pressure pattern in the impeller determined by Chen et al. (1993). These authors transferred the pressure pattern measured on the shroud surface (i.e. in the absolute frame) to that related to the rotating blade channels. The transferred pressure pattern is thus a two-dimensional one. The existence of the low and high pressure vortices according to the Rossby wave theory is confirmed by this experiment. The development stages of the two vortices, in combination

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Danner, Florian, and Christofer Kendall-Torry. "Effect of Blade Tip Modifications for Unducted Propulsors on Tip Vortex-Rotor Interaction Noise." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-27134.

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Front rotor tip vortices impinging on a downstream blade row of an unducted propulsor induce distinct unsteadiness to blade loads with associated sound emissions. Since the region of unsteadiness is concentrated near the blade tips, reducing the rear rotor tip diameter represents a potential means for minimising interaction noise. A survey on the aeroacoustic effects resulting from a cropped rear rotor in combination with a front rotor blade tip modification is therefore presented. Analyses are based on data from computational fluid dynamics solutions with the Reynolds-averaged Navier-Stokes e

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Saverin, Joseph, David Marten, David Holst, et al. "Comparison of Experimental and Numerically Predicted Three-Dimensional Wake Behaviour of a Vertical Axis Wind Turbine." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64004.

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The evolution of the wake of a wind turbine contributes significantly to its operation and performance, as well as to those of machines installed in the vicinity. The inherent unsteady and three-dimensional aerodynamics of Vertical Axis Wind Turbines (VAWT) have hitherto limited the research on wake evolution. In this paper the wakes of both a troposkien and a H-type VAWT rotor are investigated by comparing experiments and calculations. Experiments were carried out in the large-scale wind tunnel of the Politecnico di Milano, where unsteady velocity measurements in the wake were performed by me

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Peters, Andreas, and Zolta´n S. Spakovszky. "Rotor Interaction Noise in Counter-Rotating Propfan Propulsion Systems." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22554.

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Due to their inherent noise challenge and potential for significant reductions in fuel burn, counter-rotating propfans (CRPs) are currently being investigated as potential alternatives to high-bypass turbofan engines. This paper introduces an integrated noise and performance assessment methodology for advanced propfan powered aircraft configurations. The approach is based on first principles and combines a coupled aircraft and propulsion system mission and performance analysis tool with 3-D unsteady, full wheel CRP CFD computations and aero-acoustic simulations. Special emphasis is put on comp

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Tanaka, Nozomi, Tsutomu Oishi, Yoshinori Ooba, Shunji Enomoto, Kazuomi Yamamoto, and Tatsuya Ishii. "Experimental and Computational Approach for Jet Noise Mitigation by Mixing Control Devices." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45200.

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The notched nozzle as a new concept has been investigated for conventional nozzle design together with the Chevron nozzle and Micro-jets, through feasibility studies. The notched nozzle has a plurality of triangular pyramid-shaped dent positioned in a circumferential direction along the nozzle exit. These studies include acoustic experiments that utilize a lab-scale simple model in an anechoic chamber and numerical approaches. The results of the Large Eddy Simulation are compared with the results of either acoustic or aerodynamic experiments. The objective of these investigations is to verify

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Rapports d'organisations sur le sujet "Vortice polare"

Bhowmick, Rupsa, Darin Comeau, and Carmela Veneziani. Inferring Causal Relationships between Tropopause Polar Vortices and Arctic Cyclones. Office of Scientific and Technical Information (OSTI), 2023. http://dx.doi.org/10.2172/1994086.

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Ehrmann, Thomas, Mamikon Gulian, and Michael Weylandt. Improved Subseasonal Forecasting of Extreme Polar Vortices Using Machine Learning. Office of Scientific and Technical Information (OSTI), 2024. http://dx.doi.org/10.2172/2430051.

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