Responses of Guangdong coastal upwelling to the summertime typhoons of 2006

查看全文 作　　者：PAN [1]AiJun;GUO [1]XiaoGang;XU [1]JinDian;HUANG [1]Jiang;WAN [1]XiaoFang

机构地区：[1]Ocean Dynamics Laboratory,Third Institute of Oceanography,State Oceanic Administration(TIOSOA),Xiamen 361005,China

出　　处：《Science China Earth Sciences》索引2012年第55卷第3期,共12页

基　　金：supported by the Chinese Offshore Physical Oceanography and Marine Meteorology Investigation and Assessment Project (Grant No.908-ZC-I-01);the Chinese Main Estuarine Dynamic Sedimentary Processand Its Impacts on Coastal Economic Development (Grant No.908-02-01-04);the Chinese Main Estuarine and the Adjacent Sea Environmental Quality Evaluation (Grant No. 908-02-02-02);the National Natural Science Foundation of China (Grant Nos. 40806013 and 41176031);the China Ocean University Physical Oceanography Key Laboratory Open Fund (Grant No. 200904) 摘　　要：The effects of typhoon intrusion on the Guangdong coastal upwelling system were investigated on the basis of in situ CTD (conductivity-temperature-depth) cruise observations and especially upward-looking ADCP (Acoustic Doppler Current Profil- ers) measurements obtained from a comprehensive survey of the Guangdong coastal region carried out by the Chinese Off-shore Investigation and Assessment Project in the summer of 2006. It was found that northeastward geostrophic advection driven by the summer monsoon has a significant near-seabed onshore component adjacent to Shantou, which in conjunction with upper-level offshore Ekman flow, constitutes the canonical Guangdong coastal upwelling system. Further analyses suggested that the Guangdong coastal upwelling system is sensitive to subtle changes in the typhoon intensity and migration pathway. On one hand, as a typhoon approaches from north of the upwelling system (e.g. Typhoon 0604 (Bilis) and Typhoon 0605 (Kaemi)) in the early phase of intrusion, the enhanced southwesterly leads to exceptional enhancement of the onshore flow; i.e., enhanced upwelling. Afterward, irrespective of the forced ocean responses resulting from the stronger local winds (Typhoon 0604) or the moderate typhoon-induced inertial oscillations (Typhoon 0605), the situation is not conducive to sustaining a stable, persistent upwelling system. On the other hand, when there is typhoon intrusion south of the upwelling system (e.g. Typhoon 0606 (Prapiroon)), the favorable southwesterly tends to be substituted by an anomalous northeasterly, which destroys the traditional coastal upwelling pattern. However, the canonical upwelling system tends to recover within 1-2 days of the typhoon passing. 关键词：台风强度广东沿海夏季季风反应上升流 ADCP 评估项目沿海地区

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Responses of Guangdong coastal upwelling to the summertime typhoons of 2006

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