期刊
OCEAN SCIENCE
卷 11, 期 3, 页码 361-371出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/os-11-361-2015
关键词
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资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA11010103]
- Natural Science Foundation of China [41306018]
- National Basic Research Program of China [2010CB950302, 2012CB955603]
- Knowledge Innovation Program of the Chinese Academy of Sciences [SQ201108]
Using a geometric eddy identification method, cyclonic and anticyclonic eddies from submesoscale to mesoscale in the South Indian Ocean (SIO) have been statistically investigated based on 2082 surface drifters from 1979 to 2013. A total of 19 252 eddies are identified, 60% of them anticyclonic eddies. For the submesoscale eddies (radius r < 10 km), the ratio of cyclonic eddies (3183) to anticyclonic eddies (7182) is 1 to 2. In contrast, the number of anticyclonic and cyclonic eddies with radius r >= 10 km is almost equal. Mesoscale and submesoscale eddies show different spatial distributions. Eddies with radius r >= 100 km mainly appear in the Leeuwin Current, a band along 25 degrees S, Mozambique Channel, and Agulhas Current, areas characterized by large eddy kinetic energy. The submesoscale anticyclonic eddies are densely distributed in the subtropical basin in the central SIO. The number of mesoscale eddies shows statistically significant seasonal variability, reaching a maximum in October and minimum in February.
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