南沙暖水形成的动力和热动力过程的初步数值研究  

Preliminary Numerical Study on the Dynamic and Thermodynamic Process of Nansha Warm Water

作　　者：蔡树群[1] 甘子钧[1] 李志伟[2] 龙小敏[1] 董丹鹏[1] 

机构地区：[1]中国科学院南海海洋研究所LED重点实验室,广东广州510301 [2]香港理工大学

出　　处：《海洋科学进展》2004年第2期138-146,共9页Advances in Marine Science

基　　金：中国科学院南海海洋研究所知识创新工程领域前沿项目(LYQY200310);国家自然科学基金资助项目--南海南部流场季节性变化与中尺度波动特征的研究(40376003);全球海洋和南海局域熵及其时-空结构的研究(40276004);国家"十五"科技攻关项目--南沙群岛及其邻近海区综合调查课题(2001DIA50041)

摘　　要：利用一个简化的上混合层垂直积分模式,对南海南部"南沙暖水"形成的动力和热动力过程进行数值研究。结果表明:(1)在春季,南沙暖水的形成主要来自海面净热通量的贡献,而通过热平流、苏禄海或巽它陆架以南的暖水进入的贡献甚小;(2)在冬季,南沙群岛海区流场强度增大,热平流项的贡献大于或等于海面净热通量的贡献,海温的降低幅度也较其他深海区的要大。但由于该海区在此前的季节中初始温度场较高,因而使得该海区的海温仍保持较高的水平;(3)南沙暖水的形成和维持高温的机制是随着季节的变化而变化的。A reduced vertically integrated upper mixed model is used to numerically study the dynamic and thermodynamic process of formation of Nansha Water Water(NWW) in the southern South China Sea. It is shown from the study results that (1) in spring, the formation of NWW is mainly due to the sea surface net heat flux, and the contribution of the thermal advection and the entered warm water from Sulu Sea or the area south of the Sunda Shelf are small; (2) in winter, the strength of the current field in the Nansha Islands sea areas increases, and the contribution of the thermal advection is greater than or equal to that of the sea surface net heat flux, so the drop in sea temperature is greater than that in other deep sea areas, but the sea temperature in the sea area still keeps high because the initial sea temperature field in the preceding season is higher; (3) the mechanism of formation and maintenance of high temperature of NWW varies with season.

关 键 词：南沙群岛 南沙暖水 动力过程 热动力过程 数值模式 

分 类 号：P731.2[天文地球—海洋科学] P722.7