| 摘要: |
| 针对冬、春季南海海区风场，表层海流、海温场的季节变化，选用了21/2层海洋模式和简单一层大气边界层模式，研究了冬、春季东北风作用下南海上层海洋环流的基本形态及其对SST的影响，估算了这种影响对海面风场的反馈效应。研究结果表明，冬、春季东北季风与南海环流的相互作用对吕宋岛两部海域的气旋式冷涡的形成和维持有利。冬季（1月）强东北风作用使南海上层为一气旋式环流，上层环流对季风的反馈作用可使南海西北部东北风减弱，东南部东北风略加强，由北向南的越赤道流略强；春季（4月）弱东北风作用使南海南部、北部上层各有一气旋式环流，两个气旋式环流之间有一个反气旋式的环流，上层环流对季风的反馈作用使东北季风风速更弱，有利于越赤道流的转向和南海夏季风的形成。 |
| 关键词: 东北季风 南海环流 相互作用 反馈 越赤道流 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，49636230，49476269号 |
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| INTERACTION BETWEEN THE NORTHEAST MONSOON AND OCEAN CIRCULATION IN SOUTH CHINA SEA |
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Lu Qinyu, Li Wei, Xu Qichun
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Institute of Physical Oceanography and Physical Oceanography Laboratory ,Ocean University of Qingdao, Qingdao 266003
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| Abstract: |
| The air-sea interaction of time scale larger than month is an important mechanism of low frequency anomaly in the upper layer ocean and atmosphere A 21/2-layer ocean model and a simple one-layer model of the boundary layer in atmosphere are used in this paper to simulate the seasonal variation of the sea surface wind, surface current and SST in the South China Sea (SCS). The basic pattern of the SCS's upper layer ocean circulation forced by the northeast monsoon and its effect on the SST are studied. Furthermore, feedback of SST on sea surface wind are calculated.
The results show that the interaction between the northeast monsoon and SCS circulation favors the formation and maintenance of the cyclonic cool eddy west of Luzon Island during winter and spring. In winter (January), there is a cyclonic circulation forced by the strong northeast monsoon in the upper ocean. The feedback effect of the cyclonic circulation on the monsoon could make the northeasterly get weaker in the northwest and a little stronger in the southeast of the SCS, and make the cross-equatorial flow (from north to south) get stronger. In spring (April), the northeast monsoon is weaker, a cyclonic circulation occurs in the south and the north, and an anticyclonic circulation occurs between them. The feedback of the upper layer ocean circulation on the monsoon could make the northeasterly get weaker in the SCS, and favors changing of the cross-equatorial flow and formatting of the summer monsoon. |
| Key words: Northeast monsoon, South China Sea circulation, Interaction, Feedback, Cross-equatorial flow |
