The Impact of Lee Waves on the Southern Ocean Circulation

被引：12

作者：

Yang, Luwei ^{[1
,2
]}

Nikurashin, Maxim ^{[1
,3
]}

Hogg, Andrew McC ^{[4
,5
]}

Sloyan, Bernadette M. ^{[6
,7
]}

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 Tasmania, ARC Ctr Excellence Climate Extremes, Australian Antarctic Program Partnership, Hobart, Tas, Australia

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

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

[6] CSIRO, Oceans & Atmosphere, Hobart, Tas, Australia

[7] Ctr Southern Hemisphere Ocean Res, Hobart, Tas, Australia

来源：

JOURNAL OF PHYSICAL OCEANOGRAPHY | 2021年 / 51卷 / 09期

基金：

澳大利亚研究理事会;

关键词：

Eddies; Internal waves; Ocean circulation; Wind stress; ANTARCTIC CIRCUMPOLAR CURRENT; MERIDIONAL OVERTURNING CIRCULATION; SMALL-SCALE TOPOGRAPHY; INTERNAL WAVES; MESOSCALE EDDIES; TEMPERATURE RESPONSE; DYNAMICAL BALANCE; EDDY SATURATION; DRIVEN; DISSIPATION;

D O I：

10.1175/JPO-D-20-0263.1

中图分类号：

P7 [海洋学];

学科分类号：

0707 ;

摘要：

Lee waves play an important role in transferring energy from the geostrophic eddy field to turbulent mixing in the Southern Ocean. As such, lee waves can impact the Southern Ocean circulation and modulate its response to changing climate through their regulation on the eddy field and turbulent mixing. The drag effect of lee waves on the eddy field and the mixing effect of lee waves on the tracer field have been studied separately to show their importance. However, it remains unclear how the drag and mixing effects act together to modify the Southern Ocean circulation. In this study, a lee-wave parameterization that includes both lee-wave drag and its associated lee-wave-driven mixing is developed and implemented in an eddy-resolving idealized model of the Southern Ocean to simulate and quantify the impacts of lee waves on the Southern Ocean circulation. The results show that lee waves enhance the baroclinic transport of the Antarctic Circumpolar Current (ACC) and strengthen the lower overturning circulation. The impact of lee waves on the large-scale circulation are explained by the control of lee-wave drag on isopycnal slopes through their effect on eddies, and by the control of lee-wave-driven mixing on deep stratification and water mass transformation. The results also show that the drag and mixing effects are coupled such that they act to weaken one another. The implication is that the future parameterization of lee waves in global ocean and climate models should take both drag and mixing effects into consideration for a more accurate representation of their impact on the ocean circulation.

引用

页码：2933 / 2950

页数：18