scholarly journals The response of Southern Ocean eddies to increased midlatitude westerlies: A non-eddy resolving model study

2011 ◽  
Vol 38 (3) ◽  
pp. n/a-n/a ◽  
Author(s):  
M. Hofmann ◽  
M. A. Morales Maqueda
Keyword(s):  
Southern Ocean ◽  
Ocean Eddies ◽  
Model Study

scholarly journals Dense shelf water spreading from Antarctic coastal polynyas to the deep Southern Ocean: A regional circumpolar model study

2017 ◽  
Vol 122 (8) ◽  
pp. 6238-6253 ◽  
Author(s):  
Kazuya Kusahara ◽  
Guy D. Williams ◽  
Takeshi Tamura ◽  
Robert Massom ◽  
Hiroyasu Hasumi
Keyword(s):  
Southern Ocean ◽  
Shelf Water ◽  
Model Study ◽  
Water Spreading

scholarly journals Does the sensitivity of Southern Ocean circulation depend upon bathymetric details?

2014 ◽  
Vol 372 (2019) ◽  
pp. 20130050 ◽  
Author(s):  
Andrew McC. Hogg ◽  
David R. Munday
Keyword(s):  
Southern Ocean ◽  
Wind Stress ◽  
Ocean Circulation ◽  
Bottom Water ◽  
Deep Ocean ◽  
Ocean Eddies ◽  
Oceanic Response ◽  
Water Formation ◽  
Circumpolar Current ◽  
Bottom Water Formation

The response of the major ocean currents to changes in wind stress forcing is investigated with a series of idealized, but eddy-permitting, model simulations. Previously, ostensibly similar models have shown considerable variation in the oceanic response to changing wind stress forcing. Here, it is shown that a major reason for these differences in model sensitivity is subtle modification of the idealized bathymetry. The key bathymetric parameter is the extent to which the strong eddy field generated in the circumpolar current can interact with the bottom water formation process. The addition of an embayment, which insulates bottom water formation from meridional eddy fluxes, acts to stabilize the deep ocean density and enhances the sensitivity of the circumpolar current. The degree of interaction between Southern Ocean eddies and Antarctic shelf processes may thereby control the sensitivity of the Southern Ocean to change.

scholarly journals The Unusual Surface Chlorophyll Signatures of Southern Ocean Eddies

2018 ◽  
Vol 123 (9) ◽  
pp. 6053-6069 ◽  
Author(s):  
H. R. S. Dawson ◽  
P. G. Strutton ◽  
P. Gaube
Keyword(s):  
Southern Ocean ◽  
Ocean Eddies

scholarly journals Mechanism for potential strengthening of Atlantic overturning prior to collapse

2014 ◽  
Vol 5 (1) ◽  
pp. 29-62
Author(s):  
D. Ehlert ◽  
A. Levermann
Keyword(s):  
Southern Ocean ◽  
North Atlantic ◽  
Climate Models ◽  
Meridional Overturning Circulation ◽  
Freshwater Flux ◽  
Overturning Circulation ◽  
Ocean Eddies ◽  
The North ◽  
Meridional Overturning ◽  
The North Atlantic

Abstract. The Atlantic meridional overturning circulation (AMOC) carries large amounts of heat into the North Atlantic influencing climate regionally as well as globally. Paleorecords and simulations with comprehensive climate models suggest that the positive salt-advection feedback may yield a threshold behaviour of the system. That is to say that beyond a certain amount of freshwater flux into the North Atlantic, no meridional overturning circulation can be sustained. Concepts of monitoring the AMOC and identifying its vicinity to the threshold rely on the fact that the volume flux defining the AMOC will be reduced when approaching the threshold. Here we advance conceptual models that have been used in a paradigmatic way to understand the AMOC, by introducing a density-dependent parameterization for the Southern Ocean eddies. This additional degree of freedom uncovers a mechanism by which the AMOC can increase with additional freshwater flux into the North Atlantic, before it reaches the threshold and collapses: an AMOC that is mainly wind-driven will have a constant upwelling as long as the Southern Ocean winds do not change significantly. The downward transport of tracers occurs either in the northern sinking regions or through Southern Ocean eddies. If freshwater is transported, either atmospherically or via horizontal gyres, from the low- to high-latitudes, this would reduce the eddy transport and by continuity increase the northern sinking which defines the AMOC until a threshold is reached at which the AMOC cannot be sustained. If dominant in the real ocean this mechanism would have significant consequences for monitoring the AMOC.

scholarly journals The Simulated Biological Response to Southern Ocean Eddies via Biological Rate Modification and Physical Transport

2020 ◽  
Vol 34 (6) ◽  
Author(s):  
Tyler Rohr ◽  
Cheryl Harrison ◽  
Matthew C. Long ◽  
Peter Gaube ◽  
Scott C. Doney
Keyword(s):  
Southern Ocean ◽  
Biological Response ◽  
Ocean Eddies
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