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[日 時]
2014年12月15日(月) 13時30分 ~
[場 所]
応用力学研究所 W501号室
[題 目]
Eddy-wind interaction in the California Current System: Eddy kinetic energy and Ekman pumping.
[講演者]
Dr. Heodae Seo
招聘外国人研究員(Woods Hole Oceanographic Institution(USA))
[Abstract]
The California Current System (CCS) is characterized by energetic mesoscale and filamentary eddies, which are important for sea surface temperature variability and ecosystem response for this region. Recent high-resolution satellite observations show that these mesoscale eddies significantly modify the Ekman pumping velocity through effect of SST and surface currents on wind stress, suggesting that the eddy-wind interaction is an important mechanism for eddy dynamics. The relative importance of the eddy-wind interactions via SST and currents, however, remains poorly understood. Here, we use the high-resolution fully-coupled Scripps Coupled Ocean-Atmosphere Regional (SCOAR) model to address this question by implementing a novel coupling technique that selectively removes the coupling effect due to eddy-induced SST and currents. The result shows that eddy kinetic energy (EKE) is reduced by 25-30% when the eddy-wind coupling is allowed, and this reduction is almost entirely due to effect of eddy currents on the stress, which enhances eddy drag. Also the current-induced and SST-induced Edman pumping velocities produce comparable amplitudes but different spatial patterns, representing different feedback processes to the eddy energetics. Mechanisms for change in EKE and Ekman pumping by eddy-induced SST and surface currents are discussed.
 

[世話人]
東アジア海洋大気環境研究センター 海洋モデリング分野
広瀬 直毅
 
 

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