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Dissertations / Theses on the topic 'Meridional overturning'

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Published: 2 June 2025

Last updated: 31 July 2025

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1

Boos, William R. (William Ronald) 1975. "Diapycnal mixing transience and the meridional overturning circulation." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/53161.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2002.<br>Includes bibliographical references (leaves 27-28).<br>Diapycnal mixing of ocean waters is crucial to the dynamics and associated heat transport of the meridional overturning circulation, yet uncertainty exists regarding the distribution and physical mechanisms of this mixing. This study uses a highly-idealized, single-hemisphere model of buoyancy-forced flow to examine the examine the effects of the transience of diapycnal mixing on the MOC. The strength of the MOC was found to

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2

Buckley, Martha Weaver. "Decadal variability of the Atlantic Meridional Overturning Circulation." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68891.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 141-149).<br>In the mean, the Atlantic Ocean transports 1 to 1.5 PW of heat northward, and estimates suggest that 60% of this heat transport is associated with a circulation that reaches the cold waters of the abyss. Due to the role of the Atlantic Meridional Overturning Circulation (AMOC) in ocean heat transport, numerous studies have suggested that AMOC variability plays a role in climate variabi

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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

Widener, David J. "Influence of the Antarctic Circumpolar Current on the Atlantic meridional circulation." Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/March/09Mar%5FWidener.pdf.

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Thesis (M.S. in Physical Oceanography)--Naval Postgraduate School, March 2009.<br>Thesis Advisor(s): Radko, Timour. "March 2009." Description based on title screen as viewed on April 23, 2009. Author(s) subject terms: Meridional overturning circulation, MOC, Antarctic Circumpolar Current, ACC, thermohaline circulation. Includes bibliographical references (p. 47-48). Also available in print.

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5

Galeotti, Chiara. "Multi-annual predictability of the Atlantic Meridional Overturning Circulation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23508/.

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Decadal climate predictions have the main feature of being initialized, hence lying midway between initialized seasonal forecasts and forced multi-decadal projections. The North Atlantic is among the few places where decadal variations are considered potentially predictable with an added value of the initialization due to the Atlantic Meridional Overturning Circulation (AMOC), which exhibits slow multi-annual fluctuations. A correct representation of this process is fundamental to skillfully predict climate variability in the Northern Hemisphere at these timescales. In this thesis, AMOC pred

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6

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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7

Atkinson, Christopher Paul. "Variability of the Atlantic Meridional Overturning Circulation at 26°N." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/338869/.

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The Atlantic Meridional Overturning Circulation (AMOC) and its variability has received considerable attention, motivated by its major role in the global climate system. Observations of AMOC strength at 26�N made by Rapid-WATCH (Rapid climate change - Will the Atlantic Thermohaline Circulation Halt) provide our best current estimate of the state of the AMOC. This study aims to improve understanding of ongoing measurements of AMOC variability made by Rapid-WATCH, and provide context for the 5-year timeseries presently available. The Rapid-WATCH system combines Gulf Stream transport, zonally int

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8

Butler, Edward D. "The global Meridional Overturning Circulation's response to variable buoyancy forcing." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/378965/.

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The meridional overturning circulation (MOC) is a large-scale circulation throughout the global ocean and plays a significant role in the complex global climate system. However, our traditional understanding of the processes driving the MOC has been questioned in recent years. In particular, it has been suggested that surface buoyancy forcing plays little energetic role in driving the MOC. Furthermore, doubt has also been cast over the relationship between meridional overturning and meridional density gradients. In this thesis, we revisit these two ideas using a series of equilibrium and trans

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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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10

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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11

Thomas, Matthew. "Sverdrup balance and three dimensional variability of the meridional overturning circulation." Thesis, University of East Anglia, 2012. https://ueaeprints.uea.ac.uk/48025/.

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Two numerical models are used to gain an understanding of the spatial structure of Atlantic Meridional Overturning Circulation changes and the dynamical framework within which those changes occur. Sverdrup balance is studied using the 16 year ECCO-GODAE state estimation. It is shown to hold well in the interior subtropics when integrating to a mid-depth level and when considered at spatial scales larger than approximately 5◦. Outside of the subtropics, in western boundary currents and at short spatial scales, significant departures occur mostly due to a failure in the assumption that there is

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12

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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13

Shaw, Benjamin Stuard. "Structure and Variability of the North Atlantic Meridional Overturning Circulation from Observations and Numerical Models." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_theses/74.

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This study presents an analysis of observed Atlantic Meridional Overturning Circulation (AMOC) variability at 26.5°N on submonthly to interannual time scales compared to variability characteristics produced by a selection of five high- and low-resolution, synoptically and climatologically forced OGCMs. The focus of the analysis is on the relative contributions of ocean mesoscale eddies and synoptic atmospheric forcing to the overall AMOC variability. Observations used in this study were collected within the framework of the joint U.K.-U.S. Rapid Climate Change (RAPID)-Meridional Overturning Ci

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14

Dare, Pierre-Yves. "Residual-mean analysis of the air-sea fluxes and associated oceanic meridional overturning." Thesis, Monterey, California. Naval Postgraduate School, 2006. http://hdl.handle.net/10945/2513.

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The dynamic response of the oceanic mixed-layer to the thermodynamic forcing at the sea surface is analyzed in order to describe the pattern of the oceanic meridional overturning. The technique proposed in this study is based on residual-mean theory, which takes into account the transport of buoyancy and tracers by transient eddies. From the observed air-sea density flux and mixed-layer density distributions, we estimate the two components of the Meridional Overturning Circulation (MOC) corresponding to the adiabatic (along-isopycnal) advection and the diabatic (cross-isopycnal) flux. Cal

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15

Fu, Yao [Verfasser]. "Meridional Overturning Circulation in the Tropical Atlantic - On the Meridional Ageostrophic and Geostrophic Transports, and Water Mass Properties / Yao Fu." Kiel : Universitätsbibliothek Kiel, 2018. http://d-nb.info/1151120448/34.

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16

Lewis, David Reid. "Sensitivity of the meridional overturning circulation to the pattern of the surface density flux." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/5195.

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Approved for public release; distribution is unlimited<br>The dynamic response of the thermocline to the thermodynamic forcing at the sea surface is analyzed in terms of its ability to influence the pattern of the oceanic meridional overturning. The technique utilized in this study expands upon an improved version of Walin's (1982) water-mass transformation theory, developed by Radko et al. (2008). Utilizing a general circulation model (GCM), two series of experiments are performed where surface air-sea density flux distributions are systematically perturbed in different locations to test the

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17

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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18

Myerscough, Richard. "The effect of model complexity on the stability of the Atlantic Meridional Overturning Circulation." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/72148/.

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The Atlantic Meridional Overturning Circulation (AMOC) represents a key component of the climate system. Previous studies indicate the present-day configuration of the circulation is highly sensitive to freshwater forcing, and appears able to exhibit bistability whereby contrasting states of circulation can exist under the same freshwater forcing, the choice of which is determined by the system’s history. This thesis presents an investigation into the dynamics and bistability of the AMOC in the context of the intermediate complexity Earth System Model, GENIE. Investigation of the dynamics of t

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19

Armstrong, Edward James. "Investigating the feedbacks between CO₂, the land surface and the Atlantic Meridional Overturning Circulation." Thesis, University of Bristol, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.743040.

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20

Bakker, P., A. Schmittner, J. T. M. Lenaerts, et al. "Fate of the Atlantic Meridional Overturning Circulation: Strong decline under continued warming and Greenland melting." AMER GEOPHYSICAL UNION, 2016. http://hdl.handle.net/10150/622754.

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The most recent Intergovernmental Panel on Climate Change assessment report concludes that the Atlantic Meridional Overturning Circulation (AMOC) could weaken substantially but is very unlikely to collapse in the 21st century. However, the assessment largely neglected Greenland Ice Sheet (GrIS) mass loss, lacked a comprehensive uncertainty analysis, and was limited to the 21st century. Here in a community effort, improved estimates of GrIS mass loss are included in multicentennial projections using eight state-of-the-science climate models, and an AMOC emulator is used to provide a probabilist

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21

Scott, Jeffery R. "The roles of mixing, geothermal heating, and surface buoyancy forcing in ocean meridional overturning dynamics." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/59091.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2000.<br>Includes bibliographical references (p. 121-128).<br>The dynamics of the oceanic large-scale meridional overturning circulation are investigated through a series of numerical experiments using an idealized single-hemisphere general circulation model. In addition to the system's scaling behavior, the consequences of diapycnal mixing location, the impact of deep buoyancy fluxes, and the importance of the surface restoring timescale are considered. As required by advective-diffusiv

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22

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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23

Jochum, Markus 1969. "On the pathways of the return flow of the meridional overturning circulation in the tropical Atlantic." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29062.

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Thesis (Ph. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Science; and the Woods Hole Oceanographic Institution), 2002.<br>Includes bibliographical references (p. 134-138).<br>A numerical model of the tropical Atlantic ocean is used to investigate the upper layer pathways of the Meridional Overturning Circulation (MOC) in the tropical Atlantic. The main focus of this thesis is on those parts of the tropical circulation that are thought to be important for the MOC return flow, but whose dynamics have not been under

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Persechino, Aurelie S. A. "A model study of decadal climate variability and predictability associated with the Atlantic Meridional Overturning Circulation." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/353096/.

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This study addresses the decadal variability and predictability of the Atlantic Meridional Overturning Circulation (AMOC), and associated key variables, in two IPCC-class climate models. The AMOC variability is analyzed in a new climate model CHIME, which features a novel (largely isopycnic) ocean component. Power Spectral analysis reveals enhanced variability for periods in the range 15-30 years. The primary mode of variability is associated with decadal changes in the Labrador and the Greenland-Iceland-Norwegian (GIN) seas, in both cases linked to the tropical activity about 15 years earlier

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25

Longworth, H. R. "Constraining variability of the Atlantic Meridional Overturning Circulation at 25ºN from historical observations, 1980 to 2005." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/48835/.

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The Atlantic Meridional Overturning Circulation (MOC) plays an important role in maintaining western Europe’s moderate climate. Although expected to weaken under increasing greenhouse gas concentrations, the magnitude of the response remains uncertain. Monitoring of the Atlantic MOC strength at 25ºN commenced in 2004 as part of the UK Rapid Climate Change programme. Prior to this, detection of such a slowing of the MOC and its associated meridional heat transport was inhibited by the temporally sparse observations of its strength. This thesis aims to extend the time series of Atlantic MOC at 2

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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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Ng, Hong Chin. "Investigation of sedimentary ²³¹Pa/²³ºTh as a proxy of Atlantic Meridional Overturning Circulation rate and its deglacial application." Thesis, University of Bristol, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707758.

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28

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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Han, MyeongHee. "A Study on the Relationship between the Air-Sea Density Flux and Isopycnal Meridional Overturning Circulation in a Warming Climate." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_theses/253.

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The Meridional Overturning Circulation (MOC) plays an important part in the Earth's climate, but the mechanisms that determine MOC response to climate change remain unclear. In particular, the relative importance of the adiabatic and diabatic dynamics in MOC is still under debate. This study aims to explore the relationship between the air-sea density flux and isopycnal MOC, and examine the possibility of diagnosing the adiabatic component of MOC from the air-sea density flux. This is done here using the concept of the "push-pull" mode, which consists of the adiabatic push into the deep oce

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Martínez, Méndez Gema. "Surface and Deep Circulation off South Africa: Agulhas Leakage Influence on the Meridional Overturning Circulation During the Last 345 kyr." Doctoral thesis, Universitat Autònoma de Barcelona, 2008. http://hdl.handle.net/10803/5816.

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Investigaciones paleocenográficas y simulaciones numéricas están mostrando que el Hemisferio Sur desempeña un papel importante, tanto en los cambios de la circulación global como en la definición del estado climático terrestre. <br/>Una región clave para la circulación global se encuentra en la región alrededor de Sudáfrica. Aquí, aguas superficiales y de termoclina del Océano Índico son transferidas al Atlántico a través de anillos y de filamentos de la Corriente de Agulhas. En profundidad, la transferencia de agua se produce en la dirección opuesta, con Agua Profunda del Atlántico Norte (No

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31

Beadling, Rebecca Lynn. "Impact of the Melting of the Greenland Ice Sheet on the Atlantic Meridional Overturning Circulation in 21st Century Model Projections." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/613379.

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Contemporary observations show an increase in the melting of the Greenland Ice Sheet (GrIS) since the early 21st century. Located near the critical sites of oceanic deep convection and deep water formation, the melting of the GrIS has the potential to directly impact the Atlantic Meridional Overturning Circulation (AMOC) by freshening ocean surface waters in these regions. The majority of the Coupled Model Intercomparison Project Phase 5 (CMIP5) models project a decline in AMOC strength by 10-50% during the 21st century, in response to the increase in atmospheric greenhouse gas (GHG) concentra

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32

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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Calixto, Pedro Silveira. "Vórtices da Corrente de Contorno Oeste Profunda do Atlântico ao largo da costa leste brasileira." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/21/21135/tde-24022017-173746/.

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A Corrente de Contorno Oeste Profunda (CCP) é um dos principais componentes da Célula de Revolvimento Meridional do Atlântico e, portanto, é determinante para a manutenção do clima global. Ela é gerada nas regiões subpolares do Atlântico Norte e transporta as águas formadas neste sítio para o Hemisfério Sul. A sua trajetória bem como a sua variabilidade têm sido estudada ao longo dos tempos, mas informações acerva desta corrente no Atlântico Sul ainda são escassas. Estudos recentes mostram que ao sul da latitude de 8ºS a CCP se quebra em vórtices anticiclônicos e se propagam para sul. Reu

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Clement, Louis. "The effect of eddies and Rossby waves on the Atlantic meridional overturning circulation at 26.5N and their decay at the western boundary." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/374818/.

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The meridional overturning circulation (MOC) at 26.5N in the Atlantic has a standard deviation of 4.9 Sv and contains large fluctuations at subannual periods. The geostrophic component of the MOC is believed to be influenced on subannual timescales by eddies and Rossby waves. To quantify this effect, the vertical structure and surface characteristics of westward propagating signals are studied using altimetry data and full-depth mooring measurements from the RAPID array at 26.5N. Westward propagating features are observed in the western North Atlantic in both datasets and have periods of 80-25

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Herrford, Josefine [Verfasser], Peter [Akademischer Betreuer] Brandt, and Arne [Gutachter] Biastoch. "Observing seasonal to decadal variability related to the Atlantic meridional overturning circulation at 11°S / Josefine Herrford ; Gutachter: Arne Biastoch ; Betreuer: Peter Brandt." Kiel : Universitätsbibliothek Kiel, 2021. http://d-nb.info/1234981475/34.

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Stanford, Jennifer D. "Meltwater injections and their impact on Atlantic meridional overturning circulation and climate during the time period of Heinrich Event 1 and the last deglaciation." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/66346/.

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The temporal relationship between meltwater pulse 1a (mwp-1a) and the climate history of the last deglaciation remains a subject of debate. By combining the GRIP δ18O ice core record on the new Greenland Ice Core Chronology 2005 (GICC05) timescale with the U/Th-dated Barbados coral record, it is conclusively derived that mwp-1a did not coincide with the sharp Bølling warming, but with the abrupt cooling of the Older Dryas. To evaluate whether there is a relationship between meltwater injections, North Atlantic Deep Water (NADW) formation and climate change (i.e., the long term change in the av

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Mielke, Charlotte Laura [Verfasser], and Johanna [Akademischer Betreuer] Baehr. "The North Atlantic Deep Western Boundary Current : seasonal cycle, decadal variability and relation to the Atlantic Meridional Overturning Circulation / Charlotte Laura Mielke. Betreuer: Johanna Baehr." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2015. http://d-nb.info/1068931078/34.

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Zhang, Xiao [Verfasser], Michael [Akademischer Betreuer] Schulz, and Gerrit [Akademischer Betreuer] Lohmann. "On the stability of the Atlantic Meridional Overturning Circulation and its climate impact during Late Neogene / Xiao Zhang. Gutachter: Michael Schulz ; Gerrit Lohmann. Betreuer: Michael Schulz." Bremen : Staats- und Universitätsbibliothek Bremen, 2014. http://d-nb.info/1072226391/34.

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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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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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Zhang, Yancheng [Verfasser], Gerold [Akademischer Betreuer] [Gutachter] Wefer, and Dierk [Gutachter] Hebbeln. "Impact of millennial-scale Atlantic meridional overturning circulation (AMOC) changes on tropical South American precipitation during the last glacial period / Yancheng Zhang ; Gutachter: Gerold Wefer, Dierk Hebbeln ; Betreuer: Gerold Wefer." Bremen : Staats- und Universitätsbibliothek Bremen, 2016. http://d-nb.info/1116600102/34.

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Huang, Enqing [Verfasser], Michael [Akademischer Betreuer] Schulz, and Michal [Akademischer Betreuer] Kucera. "Atlantic Meridional Overturning Circulation during the Last Glacial and Deglacial: Inferences from the Atlantic Tropical Thermocline Temperature and Seawater Radiocarbon Activity / Enqing Huang. Gutachter: Michael Schulz ; Michal Kucera. Betreuer: Michael Schulz." Bremen : Staats- und Universitätsbibliothek Bremen, 2013. http://d-nb.info/1072077094/34.

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Santarosa, Ana Claudia Aoki. "Respostas dos foraminíferos planctônicos às variações da Célula de Revolvimento Meridional do Atlântico (AMOC) desde o Último Máximo Glacial na Bacia de Campos." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/21/21136/tde-17012019-180044/.

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O objetivo do presente estudo foi investigar a resposta da assembleia de foraminíferos planctônicos frente às variações paleoceanográficas superficiais na porção oeste do Atlântico Sul, o qual desempenha um papel fundamental na Célula de Revolvimento Meridional do Atlântico (AMOC, Meridional Overturning Circulation). Para esta finalidade, foi analisado um registro sedimentar marinho contínuo desde o Último Máximo Glacial até o presente, com base na assembleia de foraminíferos planctônicos, isótopos de oxigênio e na razão Mg/Ca. Adicionalmente, foram avaliadas as variações na ocorrência e na ge

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Santos, Thiago Pereira dos. "Variações da temperatura do atlântico equatorial oeste ao longo dos últimos 40.000 anos." Niterói, 2017. https://app.uff.br/riuff/handle/1/4687.

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Submitted by Biblioteca de Pós-Graduação em Geoquímica BGQ (bgq@ndc.uff.br) on 2017-09-27T14:22:18Z No. of bitstreams: 1 Dissertac...pdf: 4004750 bytes, checksum: c28f16763d698bcdf286109327f4a3a0 (MD5)<br>Made available in DSpace on 2017-09-27T14:22:18Z (GMT). No. of bitstreams: 1 Dissertac...pdf: 4004750 bytes, checksum: c28f16763d698bcdf286109327f4a3a0 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Universidade Federal Fluminense. Instituto de Química. Programa de Pós-Graduação em Geoquímica, Niterói, RJ<br>A porção equatorial Oeste do Atlântico Sul é uma região-ch

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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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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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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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Weijer, Wilbert. "Impact of interocean exchange on the Atlantic overturning circulation = Invloed van uitwisseling tussen oceanen op de Atlantische omwentelingscirculatie /." 2000. http://bibpurl.oclc.org/web/22538.

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Bower, AS, MS Lozier, SF Gary, and CW Böning. "Interior pathways of the North Atlantic meridional overturning circulation." Thesis, 2009. http://hdl.handle.net/10161/4980.

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To understand how our global climate will change in response to natural and anthropogenic forcing, it is essential to determine how quickly and by what pathways climate change signals are transported throughout the global ocean, a vast reservoir for heat and carbon dioxide. Labrador Sea Water (LSW), formed by open ocean convection in the subpolar North Atlantic, is a particularly sensitive indicator of climate change on interannual to decadal timescales. Hydrographic observations made anywhere along the western boundary of the North Atlantic reveal a core of LSW at intermediate depths advected

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Haines, Brian Andrew. "Sensitivity of the Ocean's Meridional Overturning Circulation to Surface Conditions in the Paleogene." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11576.

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Deep circulations in the ocean affect the distribution of physical, chemical, and biological properties, and are intimately entwined with the planetary-scale climate. Numerous proxies, including neodymium (Nd) in fossil fish teeth, point to a source region in the South Pacific for much of the low-latitude deep-water during the early Paleogene. We use the MIT general circulation model (MITgcm) to test the sensitivity of deep-water formation to uncertainty in surface boundary conditions in a number of numerical modeling experiments with realistic and idealized bathymetries. Finally, the MITgcm i

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