南海海面高度季节变化规律及机制探讨  

The Seasonal Variation of Sea Surface Height in the South China Sea:Characteristics and Mechanisms

作　　者：曹越男[1] 左军成[1] 杜凌[1] 李培良[1] 李磊[1] 

机构地区：[1]中国海洋大学海洋环境学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2007年第S2期31-38,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(40676015/D0601;40376005);博士学科点专项科研基金项目(20060423014);教育部新世纪优秀人才支持计划项目(NCET-04-0646);908-02-01-04专题:气候变化和海平面上升及对沿海地区社会经济发展的影响项目资助

摘　　要：利用POP模式对南海海面高度(SSH)、环流的季节变化进行了数值模拟,并将模拟得到的海面高度和比容高度(SSL)分别与TOPEX/Poseidon(T/P)高度和Ishii(2005)温盐资料算得的比容高度进行比较。结果表明,本文较好的模拟了南海海面高度和比容高度的季节变化。海面高度和比容高度在冬季和夏季、春季和秋季的空间变化形态相反。动力高度(DSL)与模拟得到的环流结构对应。冬季,吕宋冷涡和越南南部沿岸流转向形成的逆时针环流对应两个低值中心,南海西岸由于Ekman输运海水向岸堆积使西岸动力高度达到全年最高值;夏季,越南沿岸流转向形成的顺时针环流对应高值中心,东岸动力高度相对较高,西岸动力高度达到全年最低值。在南海周边海区动力高度对总的海面高度的贡献非常大,特别是越南、广东沿岸和泰国湾,约为80%~90%。在深水海区,尤其是主要的高值中心和低值中心,动力高度的贡献虽仍比比容高度的贡献大,而其对总的海面变化的贡献却只有50%~60%,这几乎与比容高度的贡献的40%~50%相当。The POP model is used to simulate the Sea Surface Height(SSH) and current circulation in the South China Sea.The simulated SSH is similar with T/P height,while the simulated steric sea level(SSL) also coincides with the SSL computed from Ishii(2005) very well.The sea surface height anomaly and steric sea level anomaly fields are completely opposite between winter and summer,as well as between spring and autumn.The distributions of Dynamic Sea Level(DSL) and current field correspond with each other exactly.In winter,the Luzon cold eddy and the cyclonic circulation along the southeast of the Vietnam coast corresponds with two negative anomaly centres,and the DSL along the west coast of the South China Sea reaches its highest value of the year because of the Ekman Transport;in summer,the anticyclonic circulation southeast of the Vietnam coast corresponds with a positive anomaly centre,the DSL along the east coast is relatively large while the DSL along the west coast falls to its lowest value of the year.In the margin of the South China Sea,the DSL plays a critical role in the seasonal variation of the total SSH.In deep basins,especially in the positive and negative anomaly centers,the contribution of DSL to the SSH is about 50%～60%,while the SSL accounts for about 40%～50% of the SSH.

关 键 词：南海 海平面 比容高度 动力高度 贡献 

分 类 号：P731.23[天文地球—海洋科学]