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Upper ocean response to tropical cyclone wind forcing: A case study of typhoon Rammasun(2008)

Science China Earth Sciences 2015年第9期58卷 1623-1632页

作者： PEI YuHua ZHANG RongHua CHEN DaKe College of Physical and Environmental Oceanography Ocean University of China State Key Laboratory of satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences

The characteristics of the upper ocean response to tropical cyclone wind （TCW） forcing in the northwestern Pacific were in- vestigated using satellite and argo data, as well as an ocean general circulation model. In particular, a case study was carried out on typhoon Rammasun, which passed through our study area during May 6-13, 2008. It is found that the local response fight under the TCW forcing is characterized by a quick deepening of the surface mixed layer, a strong latent heat loss to the atmosphere, and an intense upwelling near the center of typhoon, leading to a cooling of the oceanic surface layer that persists as a cold wake along the typhoon track. More interestingly, the upper ocean response exhibits a four-layer thermal structure, including a cooling layer near the surface and a warming layer right below, accompanied by another pair of cooling/warming layers in the thermocline. The formation of the surface cooling/warming layers can be readily explained by the strong vertical mixing induced by TCW forcing, while the thermal response in the thermocline is probably a result of the cyclone-driven upwelling and the associated advective processes.

关键词： tropical cyclone wind forcing upper ocean response satellite and argo data ocean modeling

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