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Dissertations / Theses on the topic 'Meridional ocean circulation'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Friedrichs, Marjorie Anne MacWhorter. "Meridional circulation in the tropical North Atlantic /." Online version of thesis as technical report, 1993. http://hdl.handle.net/1912/616.

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2

Goodman, Paul Joseph. "The role of North Atlantic Deep Water formation in the thermohaline circulation /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/10025.

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3

Edwards, Erick Lee. "The pattern and dynamics of the meridional overturning Circulation in the upper ocean." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Sept/08Sep%5FEdwards.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, September 2008.<br>Thesis Advisor(s): Radko, Timour. "September 2008." Description based on title screen as viewed on November 4, 2008. Includes bibliographical references (p. 99-101). Also available in print.

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4

Pillar, Helen. "Sensitivity of the Atlantic meridional overturning circulation to surface forcing." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:42366dc7-e699-4349-95d2-89a97033d957.

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The determination of the mechanisms setting the strength and structure of the large scale circulation is a fundamental and long-standing problem in physical oceanography. In this thesis, we seek to explore the mechanisms contributing to the steady state and variability of the large scale flow, with a focus on better understanding the dynamics of the Atlantic meridional overturning circulation (AMOC). In the first part of this thesis, we explore the linear sensitivity of the monthly mean subtropical AMOC to surface fluxes of buoyancy and momentum. Our approach is to use a numerical adjoint. Key

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5

Broadbridge, Maria Barbara. "Forcing of the Southern Ocean meridional overturning circulation by internal wave breaking." Thesis, University of Southampton, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664982.

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The Southern Ocean is governed by strong wind forcing, energetic eddies and probably intense internal wave fields, which are considered to be generated in part by interaction of the eddy field with bottom topography. While wind and eddy forcing have been recognized in the dynamical balance of the Southern Ocean Meridional Overturning Circulation (MOC), the role of internal waves remains uncertain. The present study aims to investigate the extent to which the interaction of an energetic eddy field with realistic bottom topography, leading to diabatic forcing of the interior stratification throu

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6

Eichelberger, Scott James. "The effects of meridional heating gradients on the atmospheric general circulation and its variability /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/10029.

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7

Howe, Jacob Nathan William. "Investigating Atlantic meridional overturning circulation in the Quarternary using neodymium isotopes." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709394.

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8

Mazloff, Matthew R. "The southern ocean meridional overturning circulation as diagnosed from an eddy permitting state estimate." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45781.

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Thesis (Ph. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2008.<br>Includes bibliographical references (p. 115-127).<br>A modern general circulation model of the Southern Ocean with one-sixth of a degree resolution is optimized to the observed ocean in a weighted least squares sense. Convergence to the state estimate solution is carried out by systematically adjusting the control variables (atmospheric state and initial conditions) using the adjoint model. A

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9

Marson, Juliana Marini. "Meltwater Impacts on the Ocean Circulation since the Last Glacial Maximum." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/21/21135/tde-29052015-165852/.

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During the last 21,000 years, the planet underwent major changes. The atmospheric CO2 concentration increased ∼50% (Monnin et al., 2001) and the mean global temperature increased 4.0±0.8°C until pre-industrial times (Annan and Hargreaves, 2013). As a consequence of this warming, the huge ice sheets that covered North America, Northern Europe and part of Eurasia melted and the polar and subpolar ocean surface received a large amount of freshwater from these retracting ice sheets. The input of freshwater alters pressure gradients on the sea surface and also the density of water masses

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10

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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11

Pereira, Ligia Sauaya. "Reconstruction of the ocean circulation in the subtropical western South Atlantic during the last 40,000 years." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/21/21136/tde-18022019-155731/.

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The Atlantic meridional overturning circulation (AMOC) has a central role in the interhemispheric transport of heat and changes in its intensity are known to have profound impact on global climate. Disturbances in the AMOC are also supposedly associated with the past changes in marine productivity and oceanic uptake of atmospheric carbon dioxide, which contributed to the global climate changes that led to the termination of the last glacial cycle. Although the South Atlantic Ocean constitutes an important pathway for the return flow of the AMOC, the changing impacts of the AMOC especially in t

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12

Luo, Yiming. "Applications of U-decay series isotopes to studying the meridional overturning circulation and particle dynamics in the ocean." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44210.

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Two important questions in the fields of paleoceanography and marine biogeochemistry (the reconstruction of past changes in the strength and geometry of the ocean’s overturning circulation and the quantification of particle flux to the seafloor) are addressed using three isotopes from the U-decay series (²³⁴Th, ²³⁰Th and ²³¹Pa). Two-dimensional scavenging models of the Atlantic and Pacific Ocean were tuned to reproduce the ²³⁰Th and ²³¹Pa seawater activity profiles measured in these oceans and used to establish the distribution of sediment ²³¹Pa/²³⁰Th generated by simple meridional overturning

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13

Griesel, Alexa. "Modelling large scale ocean circulation : the role of mixing location and meridional pressure gradients for the Atlantic overturning dynamics." Phd thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975678671.

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14

Johnston, Barbara Mary. "Decadal-Scale Variability in the Meridional Circulation of Upper Circumpolar Deep Water and its Impact on Primary Production in the Southern Ocean." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366209.

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The Southern Ocean is vitally important in understanding climate change, both regionally and globally. This is due partly to physical factors such as the Antarctic Circumpolar Current (ACC), which facilitates the interchange of heat, nutrients and carbon dioxide between the world oceans. These physical factors also include the seasonal variation in sea-ice around the Antarctic continent and the strong Southern Hemisphere westerly winds, which are responsible for the divergence-driven upwelling of deep water to the surface, south of the Polar Front. The Upper branch of the Circumpolar Deep Wate

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15

Signorelli, Natália Tasso. "Indirect investigations of the Atlantic Meridional Overturning changes in the South Atlantic Ocean in numerical models for the 20th century." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/21/21135/tde-27032014-111133/.

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The South Atlantic has a relevant role on the AMOC variability as it includes two main conduits of its upper-ocean return flow: the NBUC and the IWBC that carry, mainly, the SACW and the AAIW and are originated from the bifurcation of the SEC. One of the hypotheses of this work is that analyzing the bifurcation variability it is possible to get an index of the AMOC changes. Another hypothesis is that in a global warming scenario, changes in the hydrological cycle would drive modifications in the water masses that are part of the AMOC, and thus, contribute to its variability. Four global model

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16

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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17

Wang, Jinbo Ph D. Massachusetts Institute of Technology. "Instabilities of an eastern boundary current with and without Large-scale Flow Influence." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68890.

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Thesis (Ph. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 221-227).<br>Eastern oceanic boundary currents are subject to hydrodynamic instability, generate small scale features that are visible in satellite images and may radiate westward into the interior, where they can be modified by the large-scale circulations. This thesis studies the stability of an eastern boundar

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18

Nwaodua, Emmanuel C. "Last Deglacial Arctic to Pacific Transgressions via the Bering Strait: Implications for Climate, Meltwater Source, Ecosystems and Southern Ocean Wind Strength." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1385374398.

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19

Desbruyères, Damien. "Variabilité de la circulation méridienne de retournement et du contenu de chaleur dans le gyre subpolaire de l'Atlantique Nord." Thesis, Brest, 2013. http://www.theses.fr/2013BRES0074/document.

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La circulation méridienne de retournement (MOC) de l’Atlantique Nord est une composante clé du système climatique global, via son rôle dans la redistribution de chaleur, d’eau douce et de propriétés chimiques entre hautes et basses latitudes. Aux moyennes et hautes latitudes, le Courant Nord-Atlantique(NAC) forme la branche haute de la MOC. Il s’écoule vers le nord-est à la frontière des gyres subpolaire et subtropical, et se divise en deux branches principales dans l’est du gyre subpolaire : une branche nord qui recircule vers l’ouest dans le gyre subpolaire et une branche sud qui alimente le

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20

Stewart, Kial Douglas. "The effects of sills and mixing on the meridional overturning circulation." Phd thesis, 2012. http://hdl.handle.net/1885/149648.

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The meridional overturning circulation of the global oceans is thought to be a result of an interplay, not yet well understood, of surface buoyancy fluxes, wind-driven upwelling and turbulent mixing. One factor believed to be important to this interplay is the latitudinal distribution of the surface buoyancy fluxes. The resulting convective circulation can be modeled in idealized laboratory experiments and numerical solutions. The convection has a number of features in common with the meridional overturning circulation and is used in this thesis to examine the effects of topography and turbule

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21

Spence, John Paul Gordon. "The impact of tropical Atlantic freshwater fluxes on the north Atlantic meridional overturning circulation." 2005. http://hdl.handle.net/1828/823.

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22

Mashayekhi, Alireza. "Diapycnal Mixing in the Ocean: From Dissipation Scale to Large Scale Meridional Overturning Circulation." Thesis, 2013. http://hdl.handle.net/1807/43660.

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In this thesis we will investigate the role of diapycnal mixing on the ocean general circulation. This thesis is divided into three main parts. In the first part we show that there exists an almost infinite number of pathways to turbulence in oceanic energetic shear zones at high Reynolds number. Such a large number of accessible routes to truly chaotic motion is not typical of most of the existing body of laboratory and numerical experiments of shear-induced diapycnal mixing, but is shown to be of relevance to diapycnal mixing in geophysical flows. A key finding is that the use of generall

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23

Wan, Xiuquan. "Effect of Atlantic Meridional Overturning Circulation Changes on Tropical Coupled Ocean-Atmosphere System." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-6975.

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The objective of this study is to investigate the effect of Atlantic meridional overturning circulation (AMOC) changes on tropical coupled ocean-atmosphere system via oceanic and atmospheric processes. A suite of numerical simulations have been conducted and the results show that both oceanic and atmospheric circulation changes induced by AMOC changes can have a profound impact on tropical sea surface temperature (SST) and sea surface salinity (SSS) conditions, but their dominance varies in different parts of the tropical oceans. The oceanic process has a dominant control on SST and SSS respon

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24

Stanley, Geoffrey John. "From winds to eddies to diapycnal mixing of the deep ocean: the abyssal meridional overturning circulation driven by the surface wind-stress." Thesis, 2013. http://hdl.handle.net/1828/4686.

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Previous numerical and theoretical results based on constant diapycnal diffusivity suggested the abyssal meridional overturning circulation (MOC) should weaken as winds over the Southern Ocean intensify. We corroborate this result in a simple ocean model, but find it does not hold in more complex models. First, models with a variable eddy transfer coefficient and simple yet dynamic atmosphere and sea-ice models show an increase, albeit slightly, of the abyssal MOC under increasing winds. Second, the abyssal MOC significantly strengthens with winds when diapycnal diffusivity is parameterized to

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25

Mullarney, Julia C. "Thermal and thermohaline convection models for the meridional overturning circulation of the oceans." Phd thesis, 2004. http://hdl.handle.net/1885/146265.

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26

Griesel, Alexa [Verfasser]. "Modelling large scale ocean circulation: the role of mixing location and meridional pressure gradients for the Atlantic overturning dynamics / von Alexa Griesel." 2005. http://d-nb.info/975678671/34.

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27

Sharif, Jahfer. "Impact of river runoff into the ocean on climate in a coupled model." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4378.

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In order to study the impact of global runoff, sensitivity experiment (NoRiv) was carried out by shutting down the entire runoff into the ocean for a period of 200 years. The changes in NoRiv, compared to the reference simulation (CR), shows the impact of global runoff (NoRiv minus CR). The evolution of mean ocean SSS in the major ocean basins show that the upper– ocean reached a quasi-stabilized stage in the first 100 years in the NoRiv. Globally, when there is no runoff, the surface ocean turns saltier with the largest increase occurring off the mouths of major river systems. High sali

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28

Palter, Jaime Beth. "On the Horizontal Advection and Biogeochemical Impacts of North Atlantic Mode Waters and Boundary Currents." Diss., 2007. http://hdl.handle.net/10161/386.

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29

Shen, Min-Hua, and 沈敏樺. "Changes of Oceanic Meridional Overturning Circulation under Global Warming: Contrast between Atlantic and Pacific Oceans." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/p3eh6t.

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