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J. Nycander, J. Nilsson, K. Döös, and G. Broström

1. Introduction Is the ocean circulation thermally or mechanically forced? Already a century ago, Sandström (1908) concluded from his laboratory experiments that the heating and cooling at the ocean surface by itself would not be able to excite a circulation in the interior of the ocean. His arguments were elaborated by Jeffreys (1925) and Defant (1961) , who concluded that the circulation must be mechanically forced. Nevertheless, for a long time, a widespread view among oceanographers

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Kristofer Döös, Joakim Kjellsson, Jan Zika, Frédéric Laliberté, Laurent Brodeau, and Aitor Aldama Campino

1. Introduction The oceanic thermohaline circulation and the global atmospheric circulation are generally analyzed as two separate systems although they influence each other through the surface of the ocean. In the present work both are represented in thermodynamic coordinates and linked to each other. We analyze and visualize how the ocean and atmosphere are closely acting together as a number of overturning cells, expressing the mixing of air and water masses. To do so we use two recently

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Raffaele Ferrari, Louis-Philippe Nadeau, David P. Marshall, Lesley C. Allison, and Helen L. Johnson

1. Introduction The global ocean overturning circulation is a key element of Earth’s climate system and the ocean biogeochemical cycles through its transport of heat, carbon, and nutrients both across latitudes and from one ocean basin to another through the Southern Ocean. Most idealized models and theories of the overturning circulation focus on the zonally averaged transports and ignore the zonal transports. Here we extend those models to capture the zonal interbasin exchanges through the

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Maxim Nikurashin and Geoffrey Vallis

1. Introduction This paper tries to make progress in the problem of understanding the deep stratification and associated overturning circulation in the ocean. In addition to being a fundamental aspect of the Earth’s ocean the deep structure is of direct importance to the climate system; however, compared to some other aspects of the large-scale ocean circulation, it has been inadequately studied and is rather poorly understood. Here, we present a simple theoretical model (or theory, for short

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Jie He, Michael Winton, Gabriel Vecchi, Liwei Jia, and Maria Rugenstein

sinking water masses through the overturning circulation. As a result, the formation of deep water plays an important role in setting the ocean heat content and heat transport. In addition, during the transformation of surface water into dense sinking water, heat is released into the atmosphere, warming the surface climate at high latitudes (e.g., Winton 2003 ; Frierson et al. 2013 ). Changes in circulation, including the convection, are an important factor in the projection of transient warming

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Gaëlle de Coëtlogon, Claude Frankignoul, Mats Bentsen, Claire Delon, Helmuth Haak, Simona Masina, and Anne Pardaens

hydrographic sections, Sato and Rossby (1995) estimated that the decrease in the baroclinic transport was 6 Sv for the same period of time, and they found that their best sample pentads were within 4 Sv of each other. Curry and McCartney (2001) gave observational evidence that the interannual-to-interdecadal variability of the intensity of the North Atlantic gyre circulation largely reflected the integral response of the ocean to the NAO forcing in the subtropical and subpolar gyres, but the

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Kristofer Döös, Johan Nilsson, Jonas Nycander, Laurent Brodeau, and Maxime Ballarotta

1. Introduction The World Ocean thermohaline circulation is frequently idealized as a conveyor belt transporting heat and freshwater from the Indo–Pacific to the Atlantic ( Broecker 1987 ). This interocean exchange of heat and freshwater, closely associated with the formation of North Atlantic Deep Water (NADW), is of key importance for the climatic and hydrographic differences between the North Atlantic and the North Pacific. It should be noted, however, that the freshwater transport into the

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Woo Geun Cheon and Jong-Seong Kug

global ocean circulation are investigated from two perspectives: 1) the buoyancy-driven teleconnection (BDT) mode that results from SO sea ice/ocean interaction and directly controls AABW formation and 2) the Ekman-driven teleconnection (EDT) mode that results from northward Ekman transport and directly controls the upwelling of Circumpolar Deep Water (CDW) and outflow of North Atlantic Deep Water (NADW), as well as remotely influencing the North Pacific and Atlantic surface WBCs and the Atlantic

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Paul Spence, Erik van Sebille, Oleg A. Saenko, and Matthew H. England

1. Introduction The abyssal circulation of the Southern Ocean is often considered, at least in a zonally integrated sense, to consist of two compensating flows. One is associated with the poleward flow of Lower Circumpolar Deep Water (LCDW), and the other is associated with the equatorward flow of Antarctic Bottom Water (AABW) (e.g., Sloyan and Rintoul 2001 ). LCDW is transformed into AABW by surface buoyancy fluxes at several locations near the Antarctic continental shelf and also through

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Jinbo Wang, Matthew R. Mazloff, and Sarah T. Gille

1. Introduction Gill and Bryan (1971 , p. 685) asked, “What would happen to the world’s ocean circulation if the Drake Passage were closed?” By conducting a series of numerical simulations with differing bathymetries, they showed that closing Drake Passage (DP) not only led to the disappearance of the Antarctic Circumpolar Current (ACC) but also had a profound impact on the global-scale circulation and on intermediate water formation in the region. While the Drake Passage allows the ACC to

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