南海障碍层的季节变化及其与海面通量的关系  

Seasonal Variation of the Barrier Layer in the South China Sea and Its Relationship to the Sea Surface Flux

作　　者：杜岩[1] 王东晓[1] 施平[1] 郭佩芳[2] 陈举[1] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境动力学重点实验室,广州510301 [2]中国海洋大学海洋环境学院,青岛266003

出　　处：《大气科学》2004年第1期101-111,共11页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金资助项目 40 1 760 0 6;"十五"社会公益研究专项 2 0 0 1DIA5 0 0 41;国家重点基础研究发展规划项目G1 9990 43 80 6资助

摘　　要：对气候平均态的温度和盐度分析证实 ,夏、秋季南海南部上层海洋存在障碍层现象。决定障碍层出现的关键因素是净淡水通量 ,而障碍层的深度和厚度分布则受风场的显著影响 ,障碍层受混合层和等温层发展的调制。夏季 ,南海南部上层海洋在东南向Ek man水平输运以及东侧下降运动双重因素作用下 ,较淡的水体在南海东南侧堆积 ,混合层底部高温水脱离混合层保留在等温层中 ,造成障碍层在南海东南侧最为深厚 ,达到 30m。最厚障碍层出现的位置和最厚“南海暖水”出现的位置几乎重合 ,障碍层的“热障”作用促进了“南海暖水”Analysis of the climatological temperature and salinity shows the evidence of the barrier layer(BL) in the southern South China Sea(SCS) in the summer. The net fresh water flux is a key factor to determine the occurrence of the BL. The structure and distribution of the BL is dominated by the wind fields, and adjusted by the development of the mixed layer (ML) and isothermal layer (IL). During summer, the SCS boundaries restrict the easterly Ekman transport, and the Ekman pumping is negative in the eastern SCS. Those two effects result in the fresher water pile up in the southeastern SCS. The high temperature waters detrain from ML and retain in IL, which cause the most deepest and thickest BL in southeastern SCS. The maximum reaches 30 m. The thickest BL occurs where the SCS Warm Water occurs, so the “heat barrier effect” facilitates the development of the SCS Warm Water.

关 键 词：障碍层 净淡水通量 风场 南海 

分 类 号：P732[天文地球—海洋科学]