南海表面浮力通量、水型变性及南海"暖水"的消长分析

利用英国南安普敦海洋中心(SOC)海-气界面的热量和淡水通量资料以及世界大洋图集(WOA01)的海面温度和盐度资料计算了南海表面各月的有效浮力通量及水型变性矢量场,分析了南海表层暖水形成和发展的季节性特征。研究结果表明,南海表层暖水的发展、维持以及消亡在很大程度上受到海洋表层浮力通量的影响;此外,南海上层水体密度的垂直结构和变化也深受表面浮力通量和表层水型变性的影响。在中、北部,南海的垂向结构季节性变化较为明显,其中冬季表层水体的下沉强度最大,深度最深,而夏季表层水体却无下沉趋势。

Buoyancy flux, water type conversion and warm water variation of surface sea water in South China Sea

The buoyancy flux and water type conversion of the sea surface due to the air-sea exchanges in the South China Sea(SCS) are estimated by using the air-sea flux data of the Southampton Oceanography Centre(SOC) and the World Ocean Atlas 2001(WOA01).The result shows that the distribution pattern of warm water in the South China Sea is quite similar to that of buoyancy flux except with a time lag about one month.The positive buoyancy flux(buoyancy gain of water body) corresponds to the formation and development of the surface warm water in the SCS;while the negative buoyancy flux(buoyancy loss of water body) means flinch and sinking of the surface warm water.The main sinking source is located in the northern SCS,and it reaches to its maximum depth in winter,which can be found from the surface water type conversion vector.