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Dissertations / Theses on the topic 'Earth's rotation'

Author: Grafiati

Published: 10 March 2023

Last updated: 31 July 2025

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1

Hancock, Craig Matthew. "Degree-2 spherical harmonics of the Earth's gravity field from Earth rotation parameters and SLR measurements to LAGEOS." Thesis, University of Newcastle Upon Tyne, 2012. http://hdl.handle.net/10443/1413.

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The gravity field of the Earth is fundamental to subjects such as geodesy and geophysics. Many observations within geodesy refer directly or indirectly to gravity. Geodetic techniques provide information regarding the Earth and the processes that act on it. Mass and angular momentum are, according to physics, conserved in a closed system. The Earth interacts very little with components outside of it and can be thought of as a closed system. Mass components in one reservoir of the Earth system are exchanged with others. Mass redistribution within the Earth system is caused by geophysical proces

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2

Winkelnkemper, Timo [Verfasser]. "Ensemble Simulations of Atmospheric Angular Momentum and its Influence on the Earth's Rotation / Timo Winkelnkemper." Bonn : Universitäts- und Landesbibliothek Bonn, 2009. http://d-nb.info/1199009350/34.

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3

Weis, Philipp. "Ocean tides and the Earth's rotation : results of a high-resolving ocean model forced by the lunisolar tidal potential." Hamburg Max-Planck-Inst. für Meteorologie, 2006. http://www.mpimet.mpg.de/fileadmin/publikationen/Reports/WEBB̲zE3̲6.pdf.

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4

Watkins, Andrew. "Earth Rotation and Deformation Signals Caused by Deep Earth Processes." Bowling Green State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1510767104519046.

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5

Howard, P. D. "Very Long Baseline Interferometry and earth rotation parameters." Thesis, University of Nottingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373809.

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6

Cotto-Figueroa, Desireé. "The Rotation Rate Distribution of Small Near-Earth Asteroids." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1224698418.

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7

Klavetter, James Jay. "The observed chaotic rotation of Hyperion." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/54331.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.<br>Includes bibliographical references (leaves 65-68).<br>by James Jay Klavetter.<br>Sc.D.

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8

Chan, Ngai Ham. "Stability of Planetary Rotation." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11684.

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This thesis focuses on the long-term rotational stability of the Earth and terrestrial planets. One important class of perturbation is a reorientation of the solid planet with respect to a rotation pole that remains fixed in an inertial frame. These motions are driven by mass redistribution within or on the surface of the planet (e.g. glaciation, mantle convective flow). Long-term changes in the orientation of the rotation pole are called True Polar Wander (TPW).<br>Earth and Planetary Sciences

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9

Seyed-Mahmoud, Behnam. "Elliptical instability in rotating ellipsoidal fluid shells applications to the earth's fluid core /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0004/NQ43451.pdf.

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10

Moore, Terry. "Satellite laser ranging and the determination of earth rotation parameters." Thesis, University of Nottingham, 1986. http://eprints.nottingham.ac.uk/13312/.

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Over recent years considerable advances have taken place in the field of space geodesy, resulting in a number of highly precise global positioning techniques. The increased resolution of many of the scientific products from the new observational techniques has stimulated the interest of not only geodesists but also geophysicists. Furthermore, their potential to determine the orientation of the earth's axis of rotation (polar motion) and the variations of the rate of rotation of the earth about that axis, was recognised by the scientific community. The result was the establishment of Project ME

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11

Symons, Leighton James. "Global GPS networks and the determination of Earth Rotation Parameters." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263465.

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12

Bergman, Michael I. (Michael Ira). "Magnetohydrodynamics of the Earth's core : 1) steady, rotating magnetoconvection 2) magnetic Rossby waves." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/51501.

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13

Crawford, Thomas Joseph. "An experimental study of the spread of buoyant water into a rotating environment." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/264526.

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This thesis examines previously unresolved issues regarding the fluid dynamics of the spread of buoyant water into a rotating environment. We focus in particular on the role that finite potential vorticity and background turbulence play in determining the flow properties. When water of an anomalous density enters into an oceanic basin, gravity-driven surface flows can be established as a result of the density difference. These flows are often of a sufficiently large scale that the dynamics are affected by the Coriolis force arising from the rotation of the earth. This causes the formation of a

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14

Artz, Thomas [Verfasser]. "Determination of Sub-daily Earth Rotation Parameters from VLBI Observations / Thomas Artz. Landwirtschaftliche Fakultät." Bonn : Universitäts- und Landesbibliothek Bonn, 2011. http://d-nb.info/1017217548/34.

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15

Archinal, Brent Allen. "Determination of earth rotation by the combination of data from different space geodetic systems /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487324944212785.

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16

Nam, Young-sun. "GPS determination of diurnal and semidiurnal variations in earth rotation parameters and the geocenter /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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17

Osman, Maslan Bin Haji. "Rotating magnetoconvection with ohmic heating." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363534.

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18

Ning, Zuoli. "Roles of plate locking and block rotation in the tectonics of the Pacific Northwest /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/6833.

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19

Rogister, Yves. "Modes normaux de modèles de Terre en rotation." Habilitation à diriger des recherches, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00773648.

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The normal-mode spectrum of rotating Earth models is made up of the seismic modes, the rotational modes and the spectrum of the liquid core. The local equations for the infinitesimal elastic-gravitational deformation, based on a Lagrangian perturbation of a spherically-averaged Earth model using the theory of hydrostatic equilibrium, are first established. A comparison is made between this approach and the classical global angular momentum approach to Earth rotation variations. The splitting of the seismic modes by rotation and ellipticity is then computed. Numerical investigation also shows t

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20

Cuccato, Davide. "Modeling, estimation and control of ring laser gyroscopes for the accurate estimation of the earth rotation." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3423956.

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He − Ne ring lasers gyroscopes are, at present, the most precise devices for absolute angular velocity measurements. Limitations to their performances come from the non-linear dynamics of the laser. Accordingly to the Lamb semi-classical theory of gas lasers, a model can be applied to a He–Ne ring laser gyroscope to estimate and remove the laser dynamics contribution from the rotation measurements. We find a set of critical parameters affecting the long term stability of the system. We propose a method for estimating the long term drift of the laser parameters, and for filtering out the laser

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21

Nurul, Huda Ibnu. "Etude des propriétés rhéologiques globales de la Terre à l'aune des observations VLBI." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEO007.

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Depuis le début du vingtième siècle, l’observation des variations de rotation de la Terre par les techniques astro-géodésiques permet de dévoiler les propriétés rhéologiques globales de la Terre. En particulier, les paramètres des modes d'oscillation libre de l'axe de rotation, qui sont aussi des paramètres de résonance - reflètent les défauts d'élasticité de la Terre solide, la réponse de l’océan au forçage externe et les propriétés de la graine fluide, éventuellement du noyau solide. On peut obtenir de meilleures contraintes sur ces paramètres de résonance en confrontant le mouvement terrest

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22

Collombet, Marielle. "Cinématique et rotation des Alpes Occidentales. Approche paléomagnétique et modélisation analogique." Phd thesis, Université Joseph Fourier (Grenoble), 2001. http://tel.archives-ouvertes.fr/tel-00509762.

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Dans les Alpes Occidentales, la plupart des modèles cinématiques considèrent que depuis la fin du Crétacé, la convergence entre les plaques Adriatique et Européenne a été accomodée par des translations le long de décrochements et de l'épaississement crustal. Les rotations, difficiles à détecter, ont souvent été négligées. Cependant certains modèles les considèrent comme un mécanisme majeur de déformation au cours de l'édification de la chaîne alpine. Afin de tester ces modèles, nous avons mené une étude paléomagnétique sur l'ensemble de la zone briançonnaise de l'Arc Alpin Occidental. Le métam

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23

Grejner-Brzezinska, Dorota A. "Analysis of GPS Data Processing Techniques: In Search of Optimized Strategy of Orbit and Earth Rotation Parameter Recovery /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487929745335624.

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24

Kramer, Emily Anne. "Rotational lightcurve analysis of binary Asteroid (22) Kalliope/Linus." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/114347.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2008.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 34).<br>Binary asteroids have been insightful to scientists in recent years in their quest to better understand the Solar System in its early stage. Observing a mutual event between a primary and its moon can yield the sizes of the objects in units of the semi-major axis a. When the linear dimensions of the orbit can be known, Kepler's Third Law allows for a solution of the mass. As an example,

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25

Deutschmann, Tim. "On Modeling Elastic and Inelastic Polarized Radiation Transport in the Earth Atmosphere with Monte Carlo Methods." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-161475.

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The three dimensional Monte Carlo radiation transport model McArtim is extended to account for the simulation of the propagation of polarized radiation and the inelastic rotational Raman scattering which is the cause of the so called Ring effect. From the achieved and now sufficient precision of the calculated Ring effect new opportunities in optical absorption spectroscopy arise. In the calculation the method of importance sampling (IS) is applied. Thereby one obtains from an ensemble of Monte Carlo photon trajectories an intensity accounting for the elastic aerosol particle-, Cabannes- a

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26

Couhert, Alexandre. "Amélioration des références massiques de la Terre par synergie entre différentes mesures de géodésie spatiale : Application à l'océanographie par altimétrie spatiale." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30242.

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Dans le contexte du changement climatique mondial et la nécessité d'étudier les conséquences de l'ampleur de la fonte des glaces continentales sur le niveau des mers ainsi que sur la répartition des masses fluides à l'échelle du globe, notre travail de thèse s'intéresse aux phénomènes à très grande échelle qui modifient la forme de la Terre, son champ de gravité et l'équilibre de sa rotation. Il se focalise sur la stratégie à mettre en place pour observer et modéliser des variations très fines sur des termes géodynamiques (coefficients de bas degrés) qui sont encore aujourd'hui mal connus, et

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27

Hicks, Stacy Jo. "Characterization of Eight Potentially Hazardous Near Earth Asteroids: Rotation Period Analysis and Structure Modeling Via Light Curve Inversion Techniques." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/3060.

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The term “homeland security”, seems to have become synonymous with terrorism in the minds of the general public. However, there are other threats to the security of the United States homeland that can be just as, if not more, devastating than terrorism. Included among these other threats is the potential of an asteroid collision with Earth. Historically, asteroid impact events have been responsible for the devastation of our planet and many of the mass extinction events encountered throughout the geologic record. Knowledge of physical parameters such as structure and rotational dynamics of the

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28

Park, Young-Gyu. "Rotating convection driven by differential bottom heating and its application." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/55050.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.<br>Includes bibliographical references (leaves 133-137).<br>by Young-Gyu Park.<br>Ph.D.

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29

Mound, Jonathan Edwin. "Long-term rotational effects on the shape of the Earth and its oceans." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63753.pdf.

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30

Robuchon, Guillaume. "Couplage entre dynamique interne et rotation : application à l'évolution de Mercure, Japet et Mars." Phd thesis, Université de Nantes, 2009. http://tel.archives-ouvertes.fr/tel-00461943.

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L'évolution de certains corps planétaires fait intervenir de manière couplée la dynamique interne et la dynamique de rotation. La convection solide, qui façonne le champ de température et donc la rhéologie visqueuse, contrôle la dissipation visqueuse du forçage de marée qui intervient sur l'évolution de l'orbite et la période de rotation. En retour, la dissipation de marée induit une composante de chauffage pour l'évolution thermique. A travers l'étude de trois corps, Mercure, Mars et Japet, je montre l'intérêt de cette formulation couplée de l'évolution. La dissipation de marée a joué un rôle

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31

Joseph, Judith Anoushka. "Motion sickness with Earth-horizontal translational and rotational oscillation presented in isolation and in combination." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/63716/.

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Low-frequency Earth-horizontal translational and rotational oscillations can cause motion sickness in transport. Previous studies have found that motion sickness depends on the frequency, magnitude, direction and duration of the motion, however, knowledge of the mechanisms of motion sickness is far from complete. The concept of sensory conflict – that motion sickness arises because of a conflict between sensed and expected sensory information is central to theories of motion sickness, but little is known about how the physical characteristics of motion influence sensed and expected sensory sig

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32

Klinger, Barry Arthur. "Eddy generation at a convex corner by a coastal current in a rotating system." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/59860.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1992.<br>Includes bibliographical references (leaves 190-195).<br>by Barry A. Klinger.<br>Ph.D.

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33

Martinsson, Lisbeth. "Barns föreställningar om dag- och nattcykeln : Har eleverna uppnått målen för år 5?" Thesis, Karlstad University, Faculty of Social and Life Sciences, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-862.

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<p>Syftet med detta examensarbete är att ta reda på hur elevers uppfattningar om de rörelser som sker i vårt solsystem stämmer överens med de vetenskapliga fakta som finns. I våra vardagliga situationer refererar vi till det vi med ögats hjälp kan uppfatta i fråga om vad som rör sig eller ej. Hur påverkas eleverna av de dagliga uttryck som de får höra sedan de är mycket små, och har de en möjlighet att med skolans hjälp förändra dessa tankesätt?</p><p>Undersökningen genomfördes med hjälp av kvalitativa intervjuer av elever i skolår 1 respektive 5. Detta för att se hur stor skillnaden är mellan

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34

O'Donnell, J. M. "Rotational nuclear energy levels of deformed nuclei in the light rare-earth region around mass 135." Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376692.

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35

Tian, Wei. "Modeling and Data Analysis of Large Ring Laser Gyroscopes." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-130967.

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Ringlaser dienen dazu, durch genaue inertiale Messungen Rotationen ohne Bezug auf ein externes Referenzsystem lokal und praktisch in Echtzeit zu bestimmen. Sie wurden in den 1970er Jahren insbesondere für die Navigation von Flugzeugen entwickelt. In den letzten Jahrzehnten wurden Ringlaser dann so weit verbessert, dass sie nun auch als eigenständige Messinstrumente in der Geodäsie Verwendung finden. Aufgrund der erreichbaren Genauigkeit ist es inzwischen möglich, Variationen in der Erdrotation mit der dafür erforderlichen Präzision zu detektieren. Der stabilste unter den Ringlasern, der so gen

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36

Nelson, Michael Roy. "I. Paleomagnetism and crustal rotations along a shear zone, Las Vegas range, Southern Nevada ; II. Seismotectonics of the Tien Shan, Central Asia." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/54960.

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37

Mäntele, Simone. "Adipose rhythms and metabolism : the circadian system orchestrates the temporal organization of the physiology in synchronization with the 24 hour rotation on the earth." Thesis, University of Surrey, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551155.

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Energy homeostasis and metabolic processes have been shown to be under 24-hour control. Hormones secreted from adipocytes and about 20% of the genes in white adipose tissue exhibit daily variations. Changes in metabolism are able to influence the clock in adipose tissue and disruption of the clock mechanism has been shown to lead to metabolic consequences. The aims of this PhD are firstly to investigate links between peripheral clocks and metabolism by using in vivo human and in vitro experimental models and secondly to investigate a cell model, which might reflect adipocyte biology better tha

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38

Audibert, Marc. "Déformation discontinue et rotations de blocs. Méthodes numériques de restauration. application à la Galilée." Phd thesis, Université Rennes 1, 1990. http://tel.archives-ouvertes.fr/tel-00594538.

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La déformation de la partie fragile de la croûte se manifeste dans de nombreux cas par l'apparition de cassures ou failles à grande échelle associées en réseaux (plusieurs familles de failles de directions différentes). Ces derniers individualisent un certain nombre de blocs que l'on peut considérer comme autant d'éléments rigides. Pour un réseau de failles quelconque donné, si la géométrie des éléments supposés rigides mais aussi leurs déplacements le long des failles (sens et rejets) sont connus, il existe une solution géométrique unique au problème de restauration c'est-àdire la recherche d

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ARRIAGADA, César. "Rotations tectoniques et déformation de l'avant-arc des Andes centrales au cours du Cénozoïque." Phd thesis, Université Rennes 1, 2003. http://tel.archives-ouvertes.fr/tel-00006036.

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Une étude paléomagnétique et structurale au nord du Chili met en évidence que le remplissage sédimentaire du bassin d'Atacama s'est accumulé dans un contexte compressif depuis le Crétacé Supérieur. Les données paléomagnétiques montrent des rotations horaires et suggèrent qu'une zone de cisaillement transpressif dextre NE-NNE a contrôlé les rotations pendant le Paléogène. Une étude de restauration en carte de la déformation des Andes Centrales indique que la formation de l'orocline est principalement associée à la déformation de la Cordillère Orientale. La variabilité spatiale et la grande quan

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Schaeffer, Nathanaël. "Instabilités, turbulence et dynamo dans une couche de fluide cisaillée en rotation rapide : importance de l'aspect ondulatoire." Phd thesis, Université Joseph Fourier (Grenoble), 2004. http://tel.archives-ouvertes.fr/tel-00009743.

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Nous développons un modèle quasi-géostrophique (QG) amélioré en moyennant l'équation de Navier-Stokes le long de l'axe de rotation. Il permet de modéliser des fluides barotropes en rotation rapide dans un récipient axisymétrique de pente finie. Ce modèle QG est utilisé pour étudier les instabilités d'une couche de cisaillement (couche de Stewartson). Nous montrons que la pente est le paramètre clé de l'instabilité, qui prend la forme d'ondes de Rossby. En plus de la viscosité, nous avons implémenté une friction d'Ekman réaliste (à partir de la formule de Greenspan) à notre modèle QG. Ceci nous

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Bourda, Géraldine. "Rotation terrestre et Variations du champ de gravité : Etude et apport des missions CHAMP et GRACE." Phd thesis, Observatoire de Paris, 2004. http://tel.archives-ouvertes.fr/tel-00008286.

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La distribution des masses à l'intérieur de la Terre régit la vitesse de rotation terrestre, ainsi que le comportement de l'axe de rotation terrestre dans la Terre, et dans l'espace. Ces distributions de masses peuvent être mesurées depuis l'espace grâce aux satellites artificiels, dont l'orbitographie donne accès à la détermination du champ de gravité terrestre. Par conséquent, les variations temporelles du champ de gravité peuvent être reliées aux variations des paramètres d'orientation terrestre (via le tenseur d'inertie). Des progrès considérables ont été effectués ces dernières années dan

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42

Hufford, Gwyneth Ellin. "Parameterization of convection in a rotating stratified ocean : comparison of numerical and laboratory experiments with theory." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/59632.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and Woods Hole Oceanographic Institution, 1995.<br>Includes bibliographical references (leaves 70-73).<br>by Gwyneth Ellin Hufford.<br>M.S.

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43

Fraser, Neil James. "Mechanisms for wintertime fjord-shelf heat exchange in Greenland and Svalbard." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31289.

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No region has felt the effects of global climate change more acutely than the cryosphere, which has changed at an unprecedented rate in the past two decades. The scientific consensus is that these changes are driven largely by increasing ocean heat content at high latitudes. In southeast Greenland, acceleration and retreat of the marine-terminating glaciers contributes significantly towards global sea level rise. Circulation in the fjords which accommodate these glaciers is thought to be driven both by freshwater input and by barrier wind-driven shelf exchange. Due to a scarcity of data, parti

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Pisani, Anna Rita <1973&gt. "A comprehensive study of the 26th December 2004 Sumatra earthquake: possible implications on Earth rotation and investigations on the coseismic and postseismic stress diffusion associated with the seismic rupture." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/864/1/Tesi_Pisani_Anna_Rita.pdf.

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In this work a multidisciplinary study of the December 26th, 2004 Sumatra earthquake has been carried out. We have investigated both the effect of the earthquake on the Earth rotation and the stress field variations associated with the seismic event. In the first part of the work we have quantified the effects of a water mass redistribution associated with the propagation of a tsunami wave on the Earth’s pole path and on the length-of-day (LOD) and applied our modeling results to the tsunami following the 2004 giant Sumatra earthquake. We compared the result of our simulations on the i

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Pisani, Anna Rita <1973&gt. "A comprehensive study of the 26th December 2004 Sumatra earthquake: possible implications on Earth rotation and investigations on the coseismic and postseismic stress diffusion associated with the seismic rupture." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/864/.

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In this work a multidisciplinary study of the December 26th, 2004 Sumatra earthquake has been carried out. We have investigated both the effect of the earthquake on the Earth rotation and the stress field variations associated with the seismic event. In the first part of the work we have quantified the effects of a water mass redistribution associated with the propagation of a tsunami wave on the Earth’s pole path and on the length-of-day (LOD) and applied our modeling results to the tsunami following the 2004 giant Sumatra earthquake. We compared the result of our simulations on the i

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46

Guervilly, Céline. "Dynamos numériques planétaires générées par cisaillement en surface ou chauffage interne." Phd thesis, Grenoble, 2010. http://www.theses.fr/2010GRENU024.

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Nous développons un code numérique hybride basé sur un modèle quasi-géostrophique des écoulements dans les noyaux planétaires forcés par un chauffage interne. Pour des petits nombres de Prandtl, une caractéristique robuste de ces écoulements est la présence d'une circulation géostrophique zonale de grande amplitude dont la taille et l'amplitude sont contrôlées par le mélange de vorticité potentielle et la friction aux bords. Des ondes de Rossby de grande taille se propagent dans la zone de convection vigoureuse. Ces écoulements produisent des dynamos cinématiques au champ poloïdal de petite éc

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Guervilly, Céline. "Dynamos numériques planétaires générées par cisaillement en surface ou chauffage interne." Phd thesis, Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00576177.

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Dans la première partie de cette thèse, nous développons un code numérique hybride basé sur un modèle quasi-géostrophique des écoulements dans les noyaux planétaires forcés par un chauffage interne. Le champ de vitesse est calculé dans le plan équatorial ; la température et le champ magnétique sont implémentés en trois dimensions dans la sphère. Cette approche hybride nous permet de modéliser des écoulements convectifs turbulents (grands nombres de Reynolds, Re>10000) sous une forte influence de la rotation (petits nombres d'Ekman) pour des petits nombres de Prandtl, P = 0.1−0.01. Une caractér

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Macedo, Sanchez Orlando. "Etude paléomagnetique des formations crétacées et tertiaires des Andes centrales du Pérou. Rôle des rotations dans la formation des déflexions andines." Phd thesis, Université Paris Sud - Paris XI, 1993. http://tel.archives-ouvertes.fr/tel-00833381.

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La déflexion majeure d'Arica, située entre 19-22° S et qui dévie l'orientation générale des structures des Andes Centrales depuis une direction péruvienne N W-SE jusqu'à une direction chilienne presque NS, est une des caractéristiques importantes de la chaîne andine. Aussi à cette latitude la croûte sud-américaine atteint une épaisseur double de la normale (-70 km). Cet épaississement crustal est à l'origine du développement de l'Altiplano, vaste plateau situé à une altitude moyenne proche de 4000 m. Pour déterminer et expliquer les mécanismes à l'origine de cet épaississement crustal et de la

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Wischnewski, Juliane. "Reconstructing climate variability on the Tibetan Plateau : comparing aquatic and terrestrial signals." Phd thesis, Universität Potsdam, 2011. http://opus.kobv.de/ubp/volltexte/2011/5245/.

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Spatial and temporal temperature and moisture patterns across the Tibetan Plateau are very complex. The onset and magnitude of the Holocene climate optimum in the Asian monsoon realm, in particular, is a subject of considerable debate as this time period is often used as an analogue for recent global warming. In the light of contradictory inferences regarding past climate and environmental change on the Tibetan Plateau, I have attempted to explain mismatches in the timing and magnitude of change. Therefore, I analysed the temporal variation of fossil pollen and diatom spectra and the geochemi

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Ohiwa, Mitchihiro 1977. "An experimental study on mixing induced by gravity currents on a sloping bottom in a rotating fluid." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/55068.

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Thesis (S.M.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences and the Woods Hole Oceanographic Institution), 2002.<br>Includes bibliographical references (p. 75-77).<br>Mixing induced by gravity currents on a sloping bottom was studied through laboratory experiments in a rotating fluid. The dense fluid on the sloping bottom formed a gravity current that could be in regimes where the flow was laminar or had waves. The mixing on a sloping bottom for gravity currents in the laminar and wave regimes was studied bot

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