Download or read book Multiple zonal jets in a quasigeostrophic model of the Antarctic Circumpolar Current written by A.M. TREGUIER and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of a Quasigeostrophic Antarctic Circumpolar Current written by Louis-Philippe Nadeau and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Zonal Jets written by Boris Galperin and published by Cambridge University Press. This book was released on 2019-02-28 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent decades, great progress has been made in our understanding of zonal jets across many subjects - atmospheric science, oceanography, planetary science, geophysical fluid dynamics, plasma physics, magnetohydrodynamics, turbulence theory - but communication between researchers from different fields has been weak or non-existent. Even the terminology in different fields may be so disparate that researchers working on similar problems do not understand each other. This comprehensive, multidisciplinary volume will break cross-disciplinary barriers and aid the advancement of the subject. It presents a state-of-the-art summary of all relevant branches of the physics of zonal jets, from the leading experts. The phenomena and concepts are introduced at a level accessible to beginning graduate students and researchers from different fields. The book also includes a very extensive bibliography.
Download or read book Ocean Modeling in an Eddying Regime written by Matthew W. Hecht and published by John Wiley & Sons. This book was released on 2013-04-30 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 177. This monograph is the first to survey progress in realistic simulation in a strongly eddying regime made possible by recent increases in computational capability. Its contributors comprise the leading researchers in this important and constantly evolving field. Divided into three parts Oceanographic Processes and Regimes: Fundamental Questions Ocean Dynamics and State: From Regional to Global Scale, and Modeling at the Mesoscale: State of the Art and Future Directions The volume details important advances in physical oceanography based on eddy resolving ocean modeling. It captures the state of the art and discusses issues that ocean modelers must consider in order to effectively contribute to advancing current knowledge, from subtleties of the underlying fluid dynamical equations to meaningful comparison with oceanographic observations and leading-edge model development. It summarizes many of the important results which have emerged from ocean modeling in an eddying regime, for those interested broadly in the physical science. More technical topics are intended to address the concerns of those actively working in the field.
Download or read book On the Dynamics of Mesoscale Eddies and Jets in the Presence of Topography written by Changheng Chen and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery of multiple nearly zonal oceanic jets enriches the classical view of mid-latitude ocean circulation, which was thought to be dominated by turbulent eddies and large-scale oceanic gyres. These jets emerge as a result of baroclinic instability and are maintained by baroclinic eddies. Potential importance of interactions of these ocean currents with major topographic features, such as the mid-Atlantic ridge, calls for the studies of the effects of bottom topography on the dynamics of eddies and the eddy-driven jets. The importance of bottom topography in the linear baroclinic instability of zonal flows on the beta-plane is examined by using analytical calculations and a quasi-geostrophic (QG) eddy-resolving numerical model. The particular focus is on the effects of a zonal topographic slope, which are compared with the effects of a meridional slope. A zonal slope always destabilizes background zonal flows that are otherwise stable in the absence of topography, regardless of the slope magnitude, whereas the meridional slopes stabilize/destabilize zonal flows only through changing the lower-level background potential vorticity (PV) gradient beyond a known critical value. Growth rates, phase speeds and vertical structure of the growing solutions strongly depend on the slope magnitude. In the numerical simulations configured with an isolated meridional ridge, unstable modes develop on both sides of the ridge and propagate eastward of the ridge, in agreement with our analytical results. In the second part of this study, we describe a novel mechanism for the generation of oceanic alternating jets by topographic ridges. The dynamics of these jets is examined using a baroclinic QG model configured with an isolated meridional ridge. Zonal topographic slopes of the ridge lead to the formation of a system of currents, consist- ing of mesoscale eddies, meridional currents over the ridge, and multiple zonal jets in the far field. Dynamical analysis shows that transient eddies are vital in sustaining the deep meridional currents, which in turn play a key role in the upper-layer PV balance. The zonal jets owe their existence to the eddy forcing over the ridge but are maintained by the Reynolds and form stresses in the far field. Locally nonzonal mean currents are shown to produce zonal jets in the far field, but the presence of local vorticity source appears to be the truly fundamental cause of jet existence. We conclude that local nonzonality of the mean PV contours, due to either a topographic ridge or a nonzonal background flow, can generate multiple zonal jets through a remote mechanism. Lastly, we explore the relationship between eddies and striations in a baroclinic double gyre ocean. Results show that alternating vertically coherent striations exist in the eastern part of the double gyre in short time mean field. Both the baroclinic QG model simulation and the analysis of altimetry sea level anomalies suggest that striations are intrinsically associated with eddy trains. Eddy vorticity forcing is closely associated with the striations and tends to drive the striations to drift meridionally. The concept of eddies being intrinsically related to striations helps to come up with a better parameterization scheme to represent the effects of eddies/striations in comprehensive models.
Download or read book Efficient Approximation Methods for the Global Long term Behavior of Dynamical Systems written by Péter Koltai and published by Logos Verlag Berlin GmbH. This book was released on 2011 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fur die Analyse des Langzeitverhaltens dynamischer Systeme werden in dieser Dissertation drei neue Ansatze, basierend auf Transferoperator-Methoden, zur Entwicklung effizienter Algorithmen vorgestellt. Zuerst leiten wir eine Diskretisierung auf dunnen Gittern her, um den Fluch der Dimension in den Griff zu bekommen. Die zweite Methode behandelt den infinitesimalen Generator der Transferoperator-Halbgruppe fur zeit-kontinuierliche Systeme. Als Drittes benutzen wir mean-field-Theorie, um die Dynamik von Subsystemen zu beschreiben, wobei besonderes Augenmerk auf die Konformationsanalyse in der Molekuldynamik gerichtet wird. Des Weiteren werden Bedingungen hergeleitet, unter welchen die Galerkin-Projektion des Transferoperators mit einer kleinen zufalligen Storung des zugrunde liegenden Systems in Verbindung gebracht werden kann. In this thesis three new transfer operator based approaches are developed for the analysis of the long-term behavior of dynamical systems. First, a sparse grid discretization is derived in order to deal with the "curse of dimension". The second method considers the infinitesimal generator of the transfer operator semigroup for continuous-time systems. The third method uses mean field theory to describe the dynamics of subsystems; here the main attention is devoted to conformation analysis in molecular dynamics. Further, conditions are derived such that the Galerkin projection of the transfer operator can be related to a small random perturbation of the underlying system.
Download or read book Rotating Thermal Flows in Natural and Industrial Processes written by Marcello Lappa and published by John Wiley & Sons. This book was released on 2012-07-25 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rotating Thermal Flows in Natural and Industrial Processes provides the reader with a systematic description of the different types of thermal convection and flow instabilities in rotating systems, as present in materials, crystal growth, thermal engineering, meteorology, oceanography, geophysics and astrophysics. It expressly shows how the isomorphism between small and large scale phenomena becomes beneficial to the definition and ensuing development of an integrated comprehensive framework. This allows the reader to understand and assimilate the underlying, quintessential mechanisms without requiring familiarity with specific literature on the subject. Topics treated in the first part of the book include: Thermogravitational convection in rotating fluids (from laminar to turbulent states); Stably stratified and unstratified shear flows; Barotropic and baroclinic instabilities; Rossby waves and Centrifugally-driven convection; Potential Vorticity, Quasi-Geostrophic Theory and related theorems; The dynamics of interacting vortices, interacting waves and mixed (hybrid) vortex-wave states; Geostrophic Turbulence and planetary patterns. The second part is entirely devoted to phenomena of practical interest, i.e. subjects relevant to the realms of industry and technology, among them: Surface-tension-driven convection in rotating fluids; Differential-rotation-driven (forced) flows; Crystal Growth from the melt of oxide or semiconductor materials; Directional solidification; Rotating Machinery; Flow control by Rotating magnetic fields; Angular Vibrations and Rocking motions; Covering a truly prodigious range of scales, from atmospheric and oceanic processes and fluid motion in "other solar-system bodies", to convection in its myriad manifestations in a variety of applications of technological relevance, this unifying text is an ideal reference for physicists and engineers, as well as an important resource for advanced students taking courses on the physics of fluids, fluid mechanics, thermal, mechanical and materials engineering, environmental phenomena, meteorology and geophysics.
Download or read book Journal of Physical Oceanography written by and published by . This book was released on 2004 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Nonlinear Geosciences written by Anastasios A. Tsonis and published by Springer. This book was released on 2017-10-13 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Nonlinear Geosciences is a set of contributions from the participants of “30 Years of Nonlinear Dynamics” held July 3-8, 2016 in Rhodes, Greece as part of the Aegean Conferences, as well as from several other experts in the field who could not attend the meeting. The volume brings together up-to-date research from the atmospheric sciences, hydrology, geology, and other areas of geosciences and presents the new advances made in the last 10 years. Topics include chaos synchronization, topological data analysis, new insights on fractals, multifractals and stochasticity, climate dynamics, extreme events, complexity, and causality, among other topics.
Download or read book Marine Turbulence written by Helmut Z. Baumert and published by Cambridge University Press. This book was released on 2005-04-04 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a comprehensive overview of marine turbulence and mixing for students, scientists, engineers.
Download or read book Current Antarctic Literature written by and published by . This book was released on 1995 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oceanic Abstracts written by and published by . This book was released on 1997 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 2004 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Antarctic Bibliography written by and published by . This book was released on 1996 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ocean Circulation and Climate written by and published by Academic Press. This book was released on 2013-10-22 with total page 893 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book represents all the knowledge we currently have on ocean circulation. It presents an up-to-date summary of the state of the science relating to the role of the oceans in the physical climate system. The book is structured to guide the reader through the wide range of world ocean circulation experiment (WOCE) science in a consistent way. Cross-references between contributors have been added, and the book has a comprehensive index and unified reference list. The book is simple to read, at the undergraduate level. It was written by the best scientists in the world who have collaborated to carry out years of experiments to better understand ocean circulation. - Presents in situ and remote observations with worldwide coverage - Provides theoretical understanding of processes within the ocean and at its boundaries to other Earth System components - Allows for simulating ocean and climate processes in the past, present and future using a hierarchy of physical-biogeochemical models
Download or read book Annular Modes in Multiple Migrating Zonal Jet Regime written by Cegeon J. Chan and published by . This book was released on 2006 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) In the model, systematic secondary (weaker) jets migrate equatorward into the primary jet. The total eddy forcing associated with the migrating jets aids in sustaining the primary jet in the presence of frictional forces. Plots of the anomalous eddy fields for both indexes show that the strongest eddy activity in the main jet is associated with the high zonal index. The zonal flow anomalies, which systematically migrate into the poleward flank of the main jet, are largely responsible for causing this positively anomalous eddy forcing. This asymmetrical forcing to the primary jet results in the zonal index variability. In this thesis, the dynamics associated with the secondary jets and its equatorward migration will be examined. We will show that when (1) the sphericity of the earth is accounted for, (2) the interior PV is homogenized, and (3) the width of the baroclinically unstable region exceeds the Rhines scale by several factors, multiple zonal jets emerge and migrate equatorward.
Download or read book Quasi Geostrophic Theory of Oceans and Atmosphere written by Fabio Cavallini and published by Springer Science & Business Media. This book was released on 2012-08-11 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large-scale winds and currents tend to balance Coriolis and pressure gradient forces. The time evolution of these winds and currents is the subject of the quasi-geostrophic theory. Chapter 1 presents concepts and equations of classical inertial fluid mechanics. Chapter 2 deals with the equations of thermodynamics that close the governing equations of the fluids. Then, the motion is reformulated in a uniformly rotating reference frame. Chapter 3 deals with the shallow-water model and the homogeneous model of wind-driven circulation. The chapter also describes a classical application of the Ekman layer to the atmosphere. Chapter 4 considers the two-layer model, as an introduction to baroclinic flows, together with the concept of available potential energy. Chapter 5 takes into account continuously stratified flows in the ocean and in the atmosphere.
