Journal
JOURNAL OF OCEANOLOGY AND LIMNOLOGY
Volume 39, Issue 3, Pages 785-799Publisher
SCIENCE PRESS
DOI: 10.1007/s00343-020-0182-7
Keywords
mesoscale air-sea coupling; western coast of South America; ocean model simulations; cooling effect; warm bias
Categories
Funding
- National Key Research and Development Program of China [2017YFC1404102, 2017YFC1404100]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA19060102, XDB40000000]
- National Natural Science Foundation of China [41690122, 41690120, 41421005]
- NSFC-Shandong Joint Fund for Marine Science Research Centers [U1406402]
- Taishan Scholarship
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The study used ROMS to investigate the feedback induced by mesoscale wind stress-SST coupling in the western coast of South America. Results showed that this feedback can reduce sea surface temperature through horizontal advection and Ekman pumping effects.
The feedback induced by mesoscale wind stress-SST coupling to the ocean in the western coast of South America was studied using the Regional Ocean Modeling System (ROMS). To represent the feedback, an empirical mesoscale wind stress perturbation model was constructed from satellite observations, and was incorporated into the ocean model. Comparing two experiments with and without the mesoscale wind stress-SST coupling, it was found that SST in the mesoscale coupling experiment was reduced in the western coast of South America, with the maximum values of 0.5 degrees C in the Peru Sea and 0.7 degrees C in the Chile Sea. A mixed layer heat budget analysis indicates that horizontal advection is the main term that explains the reduction in SST. Specifically, the feedback induced by mesoscale wind stress-SST coupling to the ocean can enhance vertical velocity in the nearshore area through the Ekman pumping, which brings subsurface cold water to the sea surface. These results indicate that the feedback due to the mesoscale wind stress-SST coupling to the ocean has the potential for reducing the warm SST bias often seen in the large-scale climate model simulations in this region.
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