Testing Methods for Reconstructing Glacial Antarctic Circumpolar Current Transport in an Isotope‐enabled Climate Model

2021 ◽  
Author(s):  
Lingwei Li ◽  
Zhengyu Liu ◽  
Jean Lynch‐Stieglitz ◽  
Chengfei He ◽  
Sifan Gu ◽  
...  
Keyword(s):  
Antarctic Circumpolar Current ◽  
Climate Model ◽  
Current Transport ◽  
Testing Methods ◽  
Circumpolar Current

The Impact of Parameterized Lateral Mixing on the Antarctic Circumpolar Current in a Coupled Climate Model

2020 ◽  
Vol 50 (4) ◽  
pp. 965-982 ◽  
Author(s):  
Sarah Ragen ◽  
Marie-Aude Pradal ◽  
Anand Gnanadesikan
Keyword(s):  
Diffusion Coefficient ◽  
Wind Stress ◽  
Antarctic Circumpolar Current ◽  
Climate Model ◽  
Lateral Diffusion ◽  
Intermediate Waters ◽  
Circumpolar Current ◽  
The Antarctic ◽  
The Impact ◽  
Lateral Diffusion Coefficient

AbstractThis study examines the impact of changing the lateral diffusion coefficient ARedi on the transport of the Antarctic Circumpolar Current (ACC). The lateral diffusion coefficient ARedi is poorly constrained, with values ranging across an order of magnitude in climate models. The ACC is difficult to accurately simulate, and there is a large spread in eastward transport in the Southern Ocean (SO) in these models. This paper examines how much of that spread can be attributed to different eddy parameterization coefficients. A coarse-resolution, fully coupled model suite was run with ARedi = 400, 800, 1200, and 2400 m2 s−1. Additionally, two simulations were run with two-dimensional representations of the mixing coefficient based on satellite altimetry. Relative to the 400 m2 s−1 case, the 2400 m2 s−1 case exhibits 1) an 11% decrease in average wind stress from 50° to 65°S, 2) a 20% decrease in zonally averaged eastward transport in the SO, and 3) a 14% weaker transport through the Drake Passage. The decrease in transport is well explained by changes in the thermal current shear, largely due to increases in ocean density occurring on the northern side of the ACC. In intermediate waters these increases are associated with changes in the formation of intermediate waters in the North Pacific. We hypothesize that the deep increases are associated with changes in the wind stress curl allowing Antarctic Bottom Water to escape and flow northward.

scholarly journals Antarctic Circumpolar Current transport and barotropic transition at Macquarie Ridge

2014 ◽  
Vol 41 (20) ◽  
pp. 7254-7261 ◽  
Author(s):  
S. R. Rintoul ◽  
S. Sokolov ◽  
M. J. M. Williams ◽  
B. Peña Molino ◽  
M. Rosenberg ◽  
...  
Keyword(s):  
Antarctic Circumpolar Current ◽  
Current Transport ◽  
Circumpolar Current

Southern Ocean Response to Strengthening Winds in an Eddy-Permitting Global Climate Model

2010 ◽  
Vol 23 (19) ◽  
pp. 5332-5343 ◽  
Author(s):  
Paul Spence ◽  
John C. Fyfe ◽  
Alvaro Montenegro ◽  
Andrew J. Weaver
Keyword(s):  
Southern Ocean ◽  
Antarctic Circumpolar Current ◽  
Climate Model ◽  
Global Climate ◽  
Global Climate Model ◽  
Temperature Response ◽  
Near Surface ◽  
Ocean Response ◽  
Circumpolar Current ◽  
The Antarctic

Abstract A global climate model with horizontal resolutions in the ocean ranging from relatively coarse to eddy permitting is used to investigate the resolution dependence of the Southern Ocean response to poleward intensifying winds through the past and present centuries. The higher-resolution simulations show poleward migration of distinct ocean fronts associated with a more highly localized near-surface temperature response than in the lower-resolution simulations. The higher-resolution simulations also show increasing southward eddy heat transport, less high-latitude cooling, and greater sea ice loss than the lower-resolution simulations. For all resolutions, from relatively coarse to eddy permitting, there is poleward migration of the Antarctic Circumpolar Current in the Atlantic and the western half of the Indian basin. Finally, zonal transports associated with the Antarctic Circumpolar Current are shown to be sensitive to resolution, and this is discussed in the context of recent observed change.

scholarly journals Response of the antarctic circumpolar current transport to global warming in a coupled model

2002 ◽  
Vol 29 (24) ◽  
pp. 26-1-26-4 ◽  
Author(s):  
Daohua Bi ◽  
William F. Budd ◽  
Anthony C. Hirst ◽  
Xingren Wu
Keyword(s):  
Global Warming ◽  
Antarctic Circumpolar Current ◽  
Coupled Model ◽  
Current Transport ◽  
Circumpolar Current ◽  
The Antarctic
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