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Dissertations / Theses on the topic 'Oceanic gyre'

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Published: 2 June 2025
Last updated: 31 July 2025

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1

Adornato, Lori R. "Oceanic Interfaces: Investigations of Biogeochemical Changes Across Nutriclines and Frontal Boundaries." [Tampa, Fla] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0001891.

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2

Belo, Wellington Ceccopieri. "A Recirculação Interna do Giro Subtropical do Atlântico Sul e a Circulação Oceânica na Região do Pólo Pré-sal da Bacia de Santos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/21/21132/tde-20042012-152310/.

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As células de recirculação interna dos giros subtropicais oceânicos são definidas por subdividilos em feições de circulação anticiclônicas adjacentes ao contorno oeste. A estrutura de recirculação interna do Giro Subtropical do Atlântico Sul (GSAS) difere daquelas originalmente propostas por Tsuchiya (1985), Reid (1989) e Stramma & Peterson (1991). Encontramos que, em termos médios, a recirculação interna é bi-partida na porção central da Bacia de Santos e confinada zonalmente no contorno oeste do GSAS. A célula de recirculação norte (CRN) se estende desde a Cadeia Vitória-Trindade (20º S) até
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3

Leseurre, Coraline. "Mécanismes de contrôle de l’absorption de CO2 anthropique et de l’acidification des eaux dans les océans Atlantique Nord et Indien Austral." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS484.

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L’océan joue un rôle important dans le système climatique du fait des importants échanges de gaz carbonique avec l’atmosphère et du déplacement de ses échanges vers un puits océanique lors de l’Anthropocène. Les océans Atlantique Nord et Austral sont reconnus comme étant des acteurs majeurs de cette séquestration du carbone anthropique (Cant). En effet, ~25% du Cant pénètre dans les eaux de surface de l’Atlantique Nord et ~40% résident dans les eaux modales et intermédiaires de l’océan Austral. Il est clairement établi que le puits de carbone présente des variations dans le temps mais mal conn
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4

Hall, Nicholas Martin Jerome. "Recirculating ocean gyres." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46326.

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5

Locarnini, Ricardo A. "Water masses and circulation in the Ross Gyre and environs." [College Station, Texas] : Texas A & M University, Office of Graduate Studies, 1994. http://catalog.hathitrust.org/api/volumes/oclc/33311210.html.

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6

Tourneur, Francis Bruno. "Meridional heat transport by wind-driven gyres in the oceanic mixed layer." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/58335.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.<br>Includes bibliographical references (leaves 83-85).<br>by Francis Bruno Tourneur.<br>M.S.
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7

Getzlaff, Klaus. "Variability in the South Indian Ocean gyre circulation derived from Argo floats." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/69047/.

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8

Ceballos, Lina Isabel. "North pacific gyre oscillation synchronizes climate fluctuations in the eastern and western boundary systems." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26552.

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Thesis (M. S.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2009.<br>Committee Chair: Di Lorenzo, Emanuele; Committee Member: Bracco, Annalisa; Committee Member: Webster, Peter J.. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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9

Oliveira, Fernanda Marcello de. "Changes in the South Atlantic Subtropical Gyre circulation from the 20th into the 21st century." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/21/21135/tde-09042018-125458/.

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Through analysis of large-scale ocean gyre dynamics from simulation results of the ocean component of the Community Earth System Model version 1 - the Parallel Ocean Program version 2 (CESM1-POP2) - this study builds upon existing research suggesting recent changes in the circulation of global subtropical gyres with respect to the South Atlantic Ocean. Results all point to an increase in the total counterclockwise circulation and a southward displacement of the sub- tropical gyre system. The northern boundary of the South Atlantic Subtropical Gyre (SASG) is represented by the bifurcation of th
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10

Pawlowicz, Ryszard A. (Ryszard Andrzej). "Tomographic observations of deep convection and the thermal evolution of the Greeland Sea Gyre, 1988-1989." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/38000.

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11

Walker, Carolyn Faye, and n/a. "Nutrient dynamics during winter convection in the North Atlantic Subtropical Gyre." University of Otago. Department of Chemistry, 2009. http://adt.otago.ac.nz./public/adt-NZDU20090825.142702.

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Storm-induced open-ocean convective mixing is one of the primary processes controlling the supply of nitrate to the sunlit layer of the oligotrophic North Atlantic Subtropical Gyre (NASG). Yet, the magnitude and timing of nitrate fluxes during winter convection is poorly understood due to an absence of targeted process studies. In the northwest NASG, multiple quasi-Lagrangian studies were conducted during the boreal winters of 2004 and 2005 in an effort to sample strong winter convection. During each of the time-series studies, inventories of vertically fluxed nitrate were quantified approxima
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12

Sommer, Anna. "Salinité de surface dans le gyre subtropical de l'Atlantique Nord (SPURS/SMOS/Mercator)." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066436/document.

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Ce travail a porté sur la variabilité de la salinité de surface (SSS) de l'océan dans le gyre subtropical Nord Atlantique. J'ai étudié la variabilité saisonnière de la SSS en lien avec les flux d'eau douce échangés avec l'atmosphère et la circulation océanique à méso échelle, au cours de plus de deux ans, d'août 2012 à décembre 2014. Les produits issus de la mission satellitaire soil moisture and ocean salinity (SMOS) corrigés de biais systématiques aux grandes échelles ont été testés et utilisés pour restituer la variabilité méso-échelle de SSS. Nous avons de surcroit utilisé les simulations
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13

Fox-Kemper, Baylor 1973. "Eddies and friction : removal of vorticity from the wind-driven gyre." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/39405.

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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences and the Woods Hole Oceanographic Institution), 2003.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 299-310).<br>Inertial terms dominate the single-gyre ocean model and prevent western-intensification when the viscosity is small. This occurs long before the oceanically-appropr
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14

Sommer, Anna. "Salinité de surface dans le gyre subtropical de l'Atlantique Nord (SPURS/SMOS/Mercator)." Electronic Thesis or Diss., Paris 6, 2016. http://www.theses.fr/2016PA066436.

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Ce travail a porté sur la variabilité de la salinité de surface (SSS) de l'océan dans le gyre subtropical Nord Atlantique. J'ai étudié la variabilité saisonnière de la SSS en lien avec les flux d'eau douce échangés avec l'atmosphère et la circulation océanique à méso échelle, au cours de plus de deux ans, d'août 2012 à décembre 2014. Les produits issus de la mission satellitaire soil moisture and ocean salinity (SMOS) corrigés de biais systématiques aux grandes échelles ont été testés et utilisés pour restituer la variabilité méso-échelle de SSS. Nous avons de surcroit utilisé les simulations
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15

Palmer, Matthew D. "Decadal variability of the subtropical gyre and deep meridional overturning circulation of the Indian Ocean." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/25122/.

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The work presented in this Thesis concerns the large-scale circulation of the Indian Ocean and follows three lines of investigation: (i) decadal variability of the subtropical gyre circulation; (ii) decadal variability of the deep meridional overturning circulation (MOC); and (iii) the influence of diapycnal diffusivity on quasi-steady MOC states. The decadal variability of the subtropical gyre transport over the ocean interior (away from boundary currents) is investigated using hydrographic data from 32°S. Estimates of the relative gyre transports are: 41 ± 5.1 Sv (1 Sv = 106 m3s-1) for 1987,
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16

Thomalla, S. J. "Phytoplankton distribution and nitrogen dynamics in the southwest Indian subtropical gyre and Southern Ocean waters." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/6451.

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17

Thibault, Margot. "Composition, abundance, origin and distribution of plastic pollution accumulated in the Southern Indian Ocean gyre." Electronic Thesis or Diss., La Réunion, 2024. https://elgebar.univ-reunion.fr/login?url=http://thesesenligne.univ.run/24_01_M_THIBAULT.pdf.

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La plupart des déchets plastiques mal gérés pénètrent dans l'environnement marin. Une fois dans les océans, ces plastiques dérivent jusqu'à atteindre des zones de convergence subtropicales, où ils s'accumulent pour former des « Garbage Patch ». Cinq de ces zones ont été découvertes,dont l’une dans le sud de l'océan Indien. Cette dernière a fait l'objet de peu d'études d'observation en surface, et plusieurs modèles de dispersion indiquent une localisation différente, la plaçant soit à l’ouest ou à l’est du bassin. Supposée être la deuxième « Garbage Patch » la plus polluée après celle du Pacifi
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18

Walkington, Ian A. "Wind and bouyancy driven models of sub-tropical ocean gyres." Thesis, Keele University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397658.

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19

Talandier, Claude. "La dynamique du courant profond de bord ouest dans l'Atlantique Nord et son influence sur la circulation méridienne moyenne." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0020/document.

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Cette thèse s’intéresse au courant profond de bord ouest dans l’Atlantique Nord, le Deep Western Boundary Current (DWBC). Ce courant transporte des eaux denses, formées dans la gyre subpolaire, vers l’équateur et constitue une des composantes majeures de la circulation méridienne Atlantique, l’AMOC (pour Atlantic Meridional Overturning Circulation). Cette circulation contribue au transport de chaleur vers les hautes latitudes et stabilise le climat actuel. L’AMOC calculée dans différents modèles de circulation générale de l’océan présente une diversité dans son intensité, sa structure spatiale
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20

Braga, Martim Mas e. "Frontal system changes in the Southeastern Atlantic Ocean." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/21/21135/tde-09042018-112125/.

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The transition between the South Atlantic and the Southern Ocean is marked by a frontal system that includes both the South Atlantic Current and the Antarctic Circumpolar Current (ACC). In the eastern part of the basin the latitudinal position of the fronts that compose this system is thought to control the input of warm waters into the Atlantic basin through the Agulhas Leakage. Changes in the Subtropical and Polar regimes associated with the system that marks the boundary between the Subtropical Gyre and the ACC are investigated using the simulation results of the ocean component of the Nati
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21

Olson, Elise Marie Black. "A coupled atmosphere-ocean model of thermohaline circulation, including wind-driven gyre circulation with an analytical solution." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/114324.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2006.<br>Cataloged from PDF version of thesis. "February 2006."<br>Includes bibliographical references (page 35).<br>A parameter representing circulation due to wind forcing is added to the thermohaline circulation model of Marotzke (1996). The model consists of four boxes and is governed by a system of two differential equations governing the temperature and salinity differences between high latitude ocean and low latitude ocean boxes. The modified model is solved numerically for equ
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22

Bertosio, Cécilia. "On the evolution of the halocline in the upper Arctic Ocean since 2007." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS423.

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Dans l'océan Arctique, la stratification est déterminée par la salinité, contrairement aux océans des latitudes moyennes qui sont stratifiés par la température. En d'autres termes, en Arctique, les eaux salées se retrouvent au fond, même si elles sont plus chaudes. La halocline de l'océan Arctique correspond à une couche épaisse de 100-200m avec de forts gradients verticaux de salinité et est située entre 100 et 350m de profondeur. Elle s'insère entre la glace de mer située en surface et la couche relativement chaude des eaux Atlantiques. La halocline isole ainsi la glace du réservoir de chale
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23

Grabon, Jeffrey Scott Lieutenant Commander. "An analysis of Atlantic water in the Arctic Ocean using the Arctic Subpolar gyre state estimate and observations." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/129018.

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Thesis: S.M., Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2020<br>Cataloged from student-submitted PDF of thesis.<br>Includes bibliographical references (pages 91-94).<br>The Atlantic Water (AW) Layer in the Arctic Subpolar gyre sTate Estimate (ASTE), a regional, medium-resolution coupled ocean-sea ice state estimate, is analyzed for the first time using bounding isopycnals. A surge of AW, marked by rapid increases in mean AW Layer potential temperature an
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24

Bouinot, Thomas. "Variabilité de la circulation méridienne dans l’Océan Atlantique Nord au cours des 2000 dernières années." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112322/document.

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L’objectif de ce travail était d’étudier la variabilité de la circulation océanique méridienne aux échelles de temps pluri décennales dans l’océan Atlantique nord au cours des deux mille dernières années, ainsi que son lien avec la variation de l’extension des gyres subtropicales et subpolaires. J’ai donc étudié, à partir de carottes de sédiments marins à fort taux de sédimentation, l’évolution de la température des eaux de surface et de la stratification de la colonne d’eau en lien avec le fonctionnement des gyres subpolaire et subtropicale.Compte tenu des difficultés spécifiques à la période
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25

Le, Corre Mathieu. "Impact de la topographie et de l'activité méso-échelle sur la dynamique de gyre subpolaire Nord Atlantique Barotropic vorticity balance of the North Atlantic subpolar gyre in an eddy-resolving model, in Ocean Science 16(2), April 2020." Thesis, Brest, 2020. http://www.theses.fr/2020BRES0021.

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Le gyre subpolaire Nord Atlantique est une région cruciale pour l’océan et le climat. La circulation dans cette région est complexe et fortement influencée par la topographie. Jusqu’à présent la dynamique a été étudiée principalement dans des modèles basses résolutions ne résolvant que peu l’activité fine échelle ainsi qu’avec une représentation grossière de la topographie. Ici nous revisitons la dynamique du gyre subpolaire Nord Atlantique dans une simulation haute résolution avec des coordonnées verticales suivant la topographie. Cela permet de représenter de manière plus réaliste l’activité
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26

Walicka, Kamila. "Impacts of basin-scale forcing on the circulation of the Faroe-Shetland Channel." Thesis, University of Aberdeen, 2019. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=240735.

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The investigation of the role of basin-scale forcing on the circulation of the Faroe-Shetland Channel (FSC) is important to further understanding of the inter-annual variability of the Atlantic water (AW) fluxes in this region. The FSC plays a key role in the transfer of warm and saline AW towards the Nordic Seas that is an integral part of the Atlantic Meridional Overturning Circulation which is projected to decline over the twenty-first century and might reduce the oceanic heat and salt transports towards the Arctic. So far little attention has been paid to the mechanisms driving the AW flux
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27

McGeehan, Timothy P. "Investigation of 2-dimensional isotropy of under-ice roughness in the Beaufort Gyre and implications for mixed layer ocean turbulence." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FMcGeehan.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, March 2008.<br>Thesis Advisor(s): Stanton, Timothy P. "March 2008." Description based on title screen as viewed on May 5, 2008. Includes bibliographical references (p. 72-74). Also available in print.
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28

Brett, Genevieve Elizabeth. "Chaotic advection, mixing, and property exchange in three-dimensional ocean eddies and gyres." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117913.

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Thesis: Ph. D., Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 259-268).<br>This work investigates how a Lagrangian perspective applies to models of two oceanographic flows: an overturning submesoscale eddy and the Western Alboran Gyre. In the first case, I focus on the importance of diffusion as compared to chaotic advection for tracers in this system. Three methods
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29

Weeber, Amy. "Seasonal and interannual variability of the marine carbonate system at the ice shelf in the eastern Weddell Gyre and its sensitivity to future ocean acidification." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/9807.

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Includes bibliographical references.<br>Ocean Acidification through the uptake of anthropogenic CO₂ is resulting in a decrease in surface water carbonate ion concentration, a critical compound for marine calcifying organisms (Fabry et al., 2008; Orr et al., 2005). Natural seasonal variability is predicted to hasten the effects of Ocean Acidification in the Southern Ocean, resulting in possible surface water wintertime aragonite (the more soluble form of calcium carbonate) undersaturation (Ωarag< 1) south of the Antarctic Polar Front by the year 2030 (McNeil and Matear, 2008). An Ocean Acidific
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30

Al-Rshaidat, Mamoon M. D. "Iron physiological autecology of the vertically migrating diatoms Ethmodiscus spp. and Rhizosolenia spp. in the Central North Pacific (CNP) gyre." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1162834373.

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31

Barrier, Nicolas. "Variability of the ocean circulation in the North-Atlantic in response to atmospheric weather regimes." Thesis, Brest, 2013. http://www.theses.fr/2013BRES0064/document.

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Le but de cette thèse est d’analyser les impacts de la variabilité atmosphérique grande échelle sur la circulation océanique. Ceci a déjà fait l’objet de nombreuses publications, dans lesquelles la variabilité atmosphérique est analysée en termes de modes de variabilité, déterminés par analyse en composantes principales (EOF en anglais) des anomalies de pression de surface. Ces modes sont l’Oscillation Nord-Atlantic (NAO), le Pattern Est-Atlantique (EAP) et le Pattern Scandinave (SCAN). La décomposition en EOF implique que les modes sont orthogonaux et symétriques. Cette dernière hypothèse a é
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32

Rieck, Jan Klaus [Verfasser]. "The Nature and Variability of Eddy Kinetic Energy in an Ocean General Circulation Model With a Focus on the South Pacific Subtropical Gyre and the Labrador Sea / Jan Klaus Rieck." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1182313647/34.

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33

Feucher, Charlène. "Structure de la stratification dans les gyres subtropicaux et sa variabilité décennale dans l'océan Atlantique Nord." Thesis, Brest, 2016. http://www.theses.fr/2016BRES0082/document.

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Les gyres subtropicaux sont au coeur des changements observés au cours des dernières décennies. On y observe entre la surface et la pycnocline permanente une augmentation du contenu thermique de l’océan. La pycnocline permanente délimite un important réservoir de chaleur et joue un rôle majeur en empêchant la chaleur accumulée en surface d’atteindre les profondeurs de l’océan. La pycnocline permanente est donc d’un intérêt important dans un contexte de changement climatique. Pour la première fois et grâce au réseau de données Argo, nous avons été capables de déterminer les propriétés de la pyc
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34

Kannar-Lichtenberger, Lea. "Anthropocene: Human Influence on Evolution and the Biosphere." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14429.

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Through my art investigations I work to bring awareness to the public in order to create understanding of the issues surrounding the human impact on the environment and its long term effects. Further to the island investigations I will be explore evolution and how the Anthropocene is influencing plant selection and behaviour. This is done through the microscopic window of Bio-Art using the Dandelion and Tree Dandelion as my metaphors for the environmental changes that are occurring. The artworks at the centre of this enquiry will consist of (but are not exclusive to) photographic, video, pr
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35

Su, Zhan. "High-Latitude Ocean Convection and Gyre Dynamics." Thesis, 2016. https://thesis.library.caltech.edu/9777/7/su_zhan_2016.pdf.

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<p>High-latitude ocean deep convection substantially contributes to vertical mixing, vertical heat transport, deep-water formation, and sea-ice budget in the World Ocean. However, the extent of this contribution remains poorly constrained. The concept of ocean convective available potential energy (OCAPE) have been developed to improve the understanding and the prediction for these deep convection events. The kinetic energy (KE) budget of deep convection is explored analytically and numerically based on the observations in the Weddell Sea. OCAPE, which is derived from thermobaricity, is identi
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36

Brown, Colbi Gabrielle 1984. "A multi-year study of summer diatom blooms in the North Pacific Subtropical Gyre." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1757.

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In the North Pacific Subtropical Gyre, a nearly-annual phytoplankton bloom forms near the subtropical front at ~30° N. Mixed communities of nitrogen-fixing diatom symbioses (diatom-diazotroph associations) increase 10²-10³ fold in these blooms. In July 2008 (31.46˚N 140.49˚W) and August 2009 (25.18 °N 154 °W), two blooms were sampled to determine diatom-diazotroph association species composition, physical, and chemical characteristics of the water column. In both 2008 and 2009, the dominant diatom-diazotroph association was the Hemiaulus hauckii-Richelia intracellularis symbiosis. The 2009 sub
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37

Siemer, Julian. "Recent trends in SST, Chl-a, productivity and wind speed in upwelling and open ocean areas in the Eastern North Atlantic subtropical gyre." Master's thesis, 2020. http://hdl.handle.net/10400.1/15208.

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The global upper ocean has been warming during the last decades accompanied with a chlorophyll-a (Chl-a) and productivity decrease. Whereas subtropical gyres show the same trends, Eastern Boundary Upwelling Systems (EBUS), are thought to increase in productivity due to increased trade winds. This study intends to analyze recent trends in sea surface temperature (SST), Chl-a, net primary production (NPP) and meridional wind in the North Atlantic subtropical gyre (NASE) in order to examine if the global trends can be detected in open ocean and upwelling areas and how the Chl-a concentration and
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