Variability and trends in Southern Ocean eddy activity in 1/12° ocean model simulations

被引:45
作者
Patara, Lavinia [1 ]
Boening, Claus W. [1 ]
Biastoch, Arne [1 ]
机构
[1] GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany
关键词
ANTARCTIC CIRCUMPOLAR CURRENT; ANNULAR MODE; CLIMATE-CHANGE; MESOSCALE EDDIES; CIRCULATION; TRANSPORT; SATURATION; IMPACT; SINK;
D O I
10.1002/2016GL069026
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The response of eddy kinetic energy (EKE) to the strengthening of Southern Hemisphere winds occurring since the 1950s is investigated with a global ocean model having a resolution of 1/12 degrees in the Antarctic Circumpolar Current domain. The simulations expose regional differences in the relative importance of stochastic and wind-related contributions to interannual EKE changes. In the Pacific and Indian sectors the model captures the EKE variability observed since 1993 and confirms previous hypotheses of a lagged response to regional wind stress anomalies. Here the multidecadal trend in wind stress is reflected in an increase in EKE typically exceeding 5 cm(2) s(-2) decade(-1). In the western Atlantic, EKE variability is mostly stochastic, is weakly correlated with wind fluctuations, and its multidecadal trends are close to zero. The nonuniform distribution of wind-related changes in the eddy activity could affect the regional patterns of ocean circulation and biogeochemical responses to future climate change.
引用
收藏
页码:4517 / 4523
页数:7
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