Lee Waves Break Eddy Saturation of the Antarctic Circumpolar Current

被引：2

作者：

Yang, Luwei ^{[1
,2
,3
]}

Nikurashin, Maxim ^{[1
,4
,5
,6
]}

Hogg, Andrew McC. ^{[7
,8
]}

Sloyan, Bernadette M. ^{[9
,10
]}

机构：

[1] Univ Tasmania, Inst Marine & Antarctic Studies, Hobart, Tas, Australia

[2] Univ Tasmania, ARC Ctr Excellence Climate Syst Sci, Hobart, Tas, Australia

[3] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA

[4] Univ Tasmania, ARC Ctr Excellence Climate Extremes, Hobart, Tas, Australia

[5] Australian Antarctic Program Partnership, Hobart, Tas, Australia

[6] Australian Ctr Excellence Antarctic Sci, Hobart, Tas, Australia

[7] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia

[8] Australian Natl Univ, ARC Ctr Excellence Climate Extremes, Canberra, ACT, Australia

[9] CSIRO, Environm, Hobart, Tas, Australia

[10] Ctr Southern Hemisphere Oceans Res, Hobart, Tas, Australia

来源：

GEOPHYSICAL RESEARCH LETTERS | 2023年 / 50卷 / 11期

基金：

澳大利亚研究理事会;

关键词：

lee waves; Antarctic Circumpolar Current; sensitivity to wind forcing; SOUTHERN-OCEAN; OVERTURNING CIRCULATION; MESOSCALE EDDIES; INTERNAL WAVES; DRIVEN; SENSITIVITY; ENERGY; IMPACT; DISSIPATION; STATE;

D O I：

10.1029/2023GL103866

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Eddy-resolving ocean models suggest that the transport of the Antarctic Circumpolar Current (ACC) may be insensitive to increasing wind. This insensitivity is due to eddies that flatten the isopycnals and compensate for their wind-driven steepening. However, the eddy-resolving models do not accurately represent the eddy dissipation processes that occur at scales smaller than the model resolution, including lee wave generation at rough topography. Using a lee wave parameterization in an idealized model of the Southern Ocean, we show that the ACC transport becomes more sensitive to wind when the lee wave drag is included. The sensitivity arises from the dependence of the lee wave drag on the bottom stratification. When the bottom stratification increases in response to wind, it increases the lee wave generation, and hence the eddy dissipation, at rough topography. As a result, the ACC shear (baroclinic transport) increases to drive stronger eddy generation to compensate.

引用

页数：9

共 53 条

[1] Topographic Enhancement of Eddy Efficiency in Baroclinic Equilibration [J].