期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 120, 期 12, 页码 7919-7933出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015JC011143
关键词
Southern Ocean; momentum balance; topographic form stress; wind stress; Antarctic Circumpolar Current; bottom form stress
类别
资金
- National Science Foundation [PLR-1141922, PLR-0961218]
- Department of Defense through the National Defense Science and Engineering Graduate Fellowship Program
- NSF [OCE-1234473, PLR-1425989, MCA06N007]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1425989] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1234473] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1141922] Funding Source: National Science Foundation
We diagnose the Southern Ocean momentum balance in a 6 year, eddy-permitting state estimate of the Southern Ocean. We find that 95% of the zonal momentum input via wind stress at the surface is balanced by topographic form stress across ocean ridges, while the remaining 5% is balanced via bottom friction and momentum flux divergences at the northern and southern boundaries of the analysis domain. While the time-mean zonal wind stress field exhibits a relatively uniform spatial distribution, time-mean topographic form stress concentrates at shallow ridges and across the continents that lie within the Antarctic Circumpolar Current (ACC) latitudes; nearly 40% of topographic form stress occurs across South America, while the remaining 60% occurs across the major submerged ridges that underlie the ACC. Topographic form stress can be divided into shallow and deep regimes: the shallow regime contributes most of the westward form stress that serves as a momentum sink for the ACC system, while the deep regime consists of strong eastward and westward form stresses that largely cancel in the zonal integral. The time-varying form stress signal, integrated longitudinally and over the ACC latitudes, tracks closely with the wind stress signal integrated over the same domain; at zero lag, 88% of the variance in the 6 year form stress time series can be explained by the wind stress signal, suggesting that changes in the integrated wind stress signal are communicated via rapid barotropic response down to the level of bottom topography.
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