期刊
JOURNAL OF MARINE SYSTEMS
卷 132, 期 -, 页码 150-161出版社
ELSEVIER
DOI: 10.1016/j.jmarsys.2014.02.002
关键词
Eddies; Ekman pumping; Wind-parallel extension; The South China Sea; Monsoons; Chlorophylls
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA11010203, XDA11020201]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KZCX2-EW-204, SQ201101]
- National Natural Science Foundation of China [U1033003, 41 276022, 41230962]
- NOAA Climate Program Office
Eddy-Ekman pumping was recently proposed as a potential mechanism to explain the high chlorophyll (Chl) concentrations inside anticyclonic eddies (AEs). In this paper, the influence of eddy-shape changes on the strength of eddy-Ekman pumping is investigated for AEs in the South China Sea (SCS) through multi-satellite data and numerical experiments. The results mainly indicate that wind-parallel (-perpendicular) extensions may enhance (reduce) eddy-Ekman pumping inside AEs. First an AE detected in northern SCS winter shows significant Chl-wind relation and uplifted near-surface isopycnals when its shape extension becomes parallel with the wind direction. In addition, satellite observations indicate significant eddy-Ekman-pumping signals appear in the central-northern SCS during the winter monsoon and in the central-eastern SCS during the winter and summer monsoons, whenever and wherever AEs' shapes show wind-parallel extensions. This regional-seasonal characteristic is further confirmed by the numerical experiments, which display a positive linear relationship between wind-parallel projective length and the strength of eddy-Ekman pumping. This study may contribute to extend the theory of eddy-Ekman pumping with emphasizing the importance of eddy shapes and wind directions, especially in the situations that high spatial-temporal variability appears in eddies and/or the wind field. (C) 2014 Elsevier B.V. All rights reserved.
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