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Etude Des Interactions Ocean Atmosphere Sur Le Gulf Stream
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Book Synopsis Étude des interactions océan-atmosphère sur le Gulf Stream by : Victor Rousseau
Download or read book Étude des interactions océan-atmosphère sur le Gulf Stream written by Victor Rousseau and published by . This book was released on 2020 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le but de cette thèse est de comprendre le rôle des fronts de température de surface de l'océan (SST) dans les interactions océan-atmosphère sur la région du Gulf Stream (GS). Nous étudions la réponse de l'atmosphère aux fronts de SST localement, au sein de la couche limite atmosphérique marine (MABL), mais également dans la troposphère libre. Par ailleurs, nous quantifions l'impact des fronts de SST sur la circulation atmosphérique en Atlantique Nord et en Europe. Nous nous focalisons sur la saison d'hiver (Décembre-Janvier-Février), les contrastes de température entre l'océan et l'atmosphère étant les plus marqués durant cette saison, ce qui induit de forts échanges en termes de flux de chaleur turbulents. Dans cette optique, nous réalisons et analysons des expériences numériques basées sur le modèle atmosphérique global ARPEGEv6, forcé en surface par des données de SSTs observées à haute résolution (1/4°). Dans la première partie de cette thèse, nous étudions les deux mécanismes principaux proposés dans la littérature pour expliquer la réponse de l'atmosphère aux fronts de SST dans la région du Gulf Stream. Ces mécanismes sont ceux du mélange vertical et de l'ajustement de pression. Dans cette étude, nous utilisons deux ensembles de simulations réalisées avec deux configurations du modèle d'atmosphère ARPEGEv6 : une configuration basse résolution (140 km) et une configuration haute résolution (50 km). Nous étudions spécifiquement la réponse de la divergence du vent en surface, un prédicteur important de l'influence des fronts de SST sur la MABL. Là où les études antérieures utilisaient majoritairement des moyennes mensuelles pour étudier la réponse de la divergence du vent aux fronts de SST, nos résultats montrent le rôle clé des perturbations synoptiques atmosphériques pour moduler la contribution relative de chacun de ces deux mécanismes de la MABL, et pour générer de la divergence du vent de surface en hiver. Nous montrons plus particulièrement qu'une grande partie de la divergence du vent simulée en moyenne sur l'hiver est due aux épisodes cycloniques qui ont lieu au cours de situations extrêmes au-dessus de la région du GS. La comparaison des résultats entre la version haute et la version basse résolution du modèle atmosphérique, montre que l'impact de l'augmentation de la résolution du modèle est faible comparée à la variabilité interne climatique et aux incertitudes observationnelles. Afin de mieux isoler l'influence des fronts de SST sur l'atmosphère, nous avons réalisé des expériences idéalisées dans lesquelles les SSTs de la région du GS sont spatialement filtrées. Cette expérience « lissée » ("smooth") est comparée à une expérience de contrôle dans laquelle le même modèle d'atmosphère est forcé à l'échelle globale par des SSTs à très haute résolution (1/12°). La comparaison entre ces deux expériences montre que la variabilité liée à la zone de fronts de SST influence localement les mécanismes de la MABL, mais également la troposphère libre dans son ensemble. En particulier, la bande de précipitations sur le GS est atténuée dans l'expérience smooth. Un gradient de SST mieux résolu dans la région du GS affecte également les routes dépressionnaires et les transports de chaleur et d'humidité par les tourbillons atmosphériques. En particulier, on montre que les fronts de SST provoquent un décalage vers le nord des transports de chaleur et d'humidité par les tourbillons atmosphériques. Ceci est en accord avec un élargissement du courant jet. La réponse du jet la plus intense est située sur l'Atlantique Nord, mais est également visible sur le bassin Pacifique. On montre ensuite qu'en accord avec la réponse du courant jet, les régimes de temps en Atlantique Nord sont également influencés par la présence des fronts de SST [...].
Book Synopsis The Role of Ocean-Atmosphere Interaction Over the Gulf Stream SST-front in North Atlantic Sector Climate by : Ralf Hand
Download or read book The Role of Ocean-Atmosphere Interaction Over the Gulf Stream SST-front in North Atlantic Sector Climate written by Ralf Hand and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Gulf Stream Extension Region by : Martin Claus
Download or read book The Gulf Stream Extension Region written by Martin Claus and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Gulf Stream written by Henry Stommel and published by Univ of California Press. This book was released on 1965-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Role of the Gulf Stream in Ocean to Atmosphere Heat Fluxes by : K. A. Kelly
Download or read book The Role of the Gulf Stream in Ocean to Atmosphere Heat Fluxes written by K. A. Kelly and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A 2-d Coupled Atmosphere-ocean Model Study of Air-sea Interaction Processes During a Cold Air Advection Over the Gulf Stream by : Ziqin Pan
Download or read book A 2-d Coupled Atmosphere-ocean Model Study of Air-sea Interaction Processes During a Cold Air Advection Over the Gulf Stream written by Ziqin Pan and published by . This book was released on 1998 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Gulf Stream by : Bruno Voituriez
Download or read book The Gulf Stream written by Bruno Voituriez and published by . This book was released on 2006 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication explores the extraordinary natural phenomenon of the Gulf Stream effect, tracing its historical discovery and exploration, outlining its causes and dynamics, and examining its profound importance for the marine ecosystems of the Atlantic Ocean.
Book Synopsis Impact of the Current Feedback and Model Resolution on the Atmosphere and Ocean Mixed Layer Over the Gulf Stream by : Jackie Crystal May
Download or read book Impact of the Current Feedback and Model Resolution on the Atmosphere and Ocean Mixed Layer Over the Gulf Stream written by Jackie Crystal May and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The atmosphere and the ocean interact through air-sea heat and momentum fluxes. Thesefluxes are critical in ocean, atmosphere, and coupled modeling across a broad range of spatial and temporal scales, from large-scale global modeling to very high-resolution regional studies and from climate studies to operational forecasting. It is important to minimize the air-sea flux errors in order to obtain accurate and realistic model results. This study investigates two sources of air-sea flux errors within the Gulf Stream region during winter months: the horizontal model resolution of the atmosphere and the ocean, and the dynamical coupling and current feedback between the ocean surface currents and the wind stress. Four different atmospheric and ocean coupled model simulations are completed with various combinations of 2 km (submesoscale resolving) and 6 km (submesoscale permitting) grid spacing. Four additional model simulations are completed using the same model resolutions defined in the first four experiments, but the coupling and feedback between the surface currents and the wind stress is included. The dynamical coupling and the current feedback lead to large changes in the surfacestress and stress curl patterns. This leads to a reduction in the ocean's mean and eddy kinetic energy, which largely controls the Gulf Stream path. The dynamical coupling is also found to control the physical gradient related to the atmospheric horizontal momentum advection. The stress gradient largely explains the variability in the horizontal advection when the dynamical coupling is not included, while the current gradient across current direction largely explains the variability in the horizontal advection when the dynamical coupling is included. Additionally, the dynamical coupling and current feedback is found to be important in regulating the mixed layer depth and SST throughout the warm water to the right of the Gulf Stream path due to the horizontal heat advection in the mixed layer. A high-resolution ocean model is found to also be important in influencing the Gulf Stream path, as well as constraining the submesoscale vertical heat fluxes to the ocean's mixed layer. The atmospheric model resolution is found to impact the magnitude of the stress, wind work, sea surface height, and surface currents, in addition to the strength of the horizontal and vertical winds throughout the atmospheric column. The dynamical coupling and current feedback, as well as having a high-resolution atmosphere and ocean, is further found to be important in the vertical extent of the state parameter fields, as well as in the atmospheric circulation patterns.
Book Synopsis Atmosphere-ocean Interactions by : William Allan Perrie
Download or read book Atmosphere-ocean Interactions written by William Allan Perrie and published by . This book was released on 2002 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalogue of Accessioned Publications by : World Data Center A--Oceanography
Download or read book Catalogue of Accessioned Publications written by World Data Center A--Oceanography and published by . This book was released on 1980 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Gulf Stream by : Thomas Frohock Gaskell
Download or read book The Gulf Stream written by Thomas Frohock Gaskell and published by . This book was released on 1973 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atmospheric Interactions with Gulf Stream Rings by : William K. Dewar
Download or read book Atmospheric Interactions with Gulf Stream Rings written by William K. Dewar and published by . This book was released on 1982 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Forests, Water and People in the Humid Tropics by : M. Bonell
Download or read book Forests, Water and People in the Humid Tropics written by M. Bonell and published by Cambridge University Press. This book was released on 2009-12-17 with total page 970 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forests, Water and People in the Humid Tropics is a comprehensive review of the hydrological and physiological functioning of tropical rain forests, the environmental impacts of their disturbance and conversion to other land uses, and optimum strategies for managing them. The book brings together leading specialists in such diverse fields as tropical anthropology and human geography, environmental economics, climatology and meteorology, hydrology, geomorphology, plant and aquatic ecology, forestry and conservation agronomy. The editors have supplemented the individual contributions with invaluable overviews of the main sections and provide key pointers for future research. Specialists will find authenticated detail in chapters written by experts on a whole range of people-water-land use issues, managers and practitioners will learn more about the implications of ongoing and planned forest conversion, while scientists and students will appreciate a unique review of the literature.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atmospheric Interactions with Gulf Stream Rings by :
Download or read book Atmospheric Interactions with Gulf Stream Rings written by and published by . This book was released on 1910 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present research has been conducted under NOAA contract # NA80AA-D-0057 and NSF contract II OCE-8240455.
Download or read book Le Gulf Stream written by Bruno Voituriez and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthèse sur le courant marin appelé Gulf Stream : son histoire, sa définition scientifique, son impact sur les climats de la Terre et sur les écosystèmes de l'Atlantique Nord.
Download or read book The Gulf Stream written by Henry Stommel and published by . This book was released on 1976 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: