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《Oceanologia Et Limnologia Sinica》 1995-02
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STUDY ON THE RESPONSE OF OCEAN TO TROPICAL CYCLONES Ⅰ. THE RESPONSE OF OCEAN TO STATIONARY AND DIFFERENT SPEED TROPICAL CYCLONES

Zhu Jianrong(Institute of Estuarine and Coastal Research, East China Normal University, Shanghai 200062)Qin Zenghao(Shanghai Typhoon Institute, Shanghai 200030)  
A two-layer. nonlinear primitive equation model based on the mass continuity,momentum and heat balance is developed to study the response of ocean to a tropical cyclone (TC). A turbulent kinetic energy budget is used to parameterize the wind stress-induced vertical mixing (entrainment). The domain of numerical calculation is the northwest Pacific and the real shape of the coast is considered. Numerical experiments indicate that oceanic response to stationary TC is asymmetric due to the Coriolis parameter's change with latitude. The mixed layer (ML) becomesshallower due to pumping induced by the strong divergency of current at the TC center. Within the maximum wind radius of the TC, the ML becomes obviously deeper and the sea surface temperature (SST) drops mainly due to gale entrainment.The rightward trend of the current response is obviously related to the moving TC track. This is because the wind speed on the right side of the track is larger than that on the left side; more important, on the right side, the wind stress vector turns clockwise with time which is roughly resonant with the current which also turns clockwise because of the Coriolis force. Whereas this process is just inverse on the left side of the TC track. Because the time scale of current response to wind stress is shorter, the TC moving speed does not greatly affect current velocity.The time scale of response of the ML and SST is longer, thus the moving speed determines how long the ocean is forced by the ga1e stress. As a result, their value and area changes are very sensitive to the TC moving speed. The response of the ML and SST to the moving TC has a rightward trend, and is more obvious when the TC moves faster.
【Fund】: 国家“八五”科技攻关906项目;;07专题部分资助
【CateGory Index】: P733.4
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