【摘要】 根据 1 998年南海季风实验 (SCSMEX)北部“实验 3号”调查船的观测资料 ,采用一维湍动能模式 (TKE模式 ) ,对春季南海北部的SST及混合层随时间变化特征进行了数值模拟和数值试验。结果表明 ,TKE模式能够很好地模拟南海北部的海表面温度SST和上混合层深度随时间变化基本特征。在南海 5— 6月 ,SST的日振荡主要依赖于短波辐射的日变化 ,短波辐射是SST的主要维持机制 ;短波辐射会使SST升高 1— 4℃ ;风的垂直混合作用主要是抑制了SST的日周期振荡。春季南海海面潜热通量和感热通量与短波辐射和风应力相比较 ,是一个对SST影响较小的量。南海北部 5月份混合层深度的变化趋势和振荡特征受风应力和短波辐射共同控制 ,风应力使混合层深度加深 5— 1 0m ,短波辐射使混合层深度平均变浅 5— 1 0m。而 6月份南海北部 ,在夏季风爆发后短波辐射较小 ,短波辐射的作用只能使混合层深度变浅1— 2m ,潜热通量和感热通量对混合层的作用会使混合层的深度加深 1— 2m ,混合层深度主要受风应力控制。更多还原

【Abstract】 In this paper, a 1 D Turbulence Kinetic Energy (TKE) model was used to simulate and experiment on the SST and upper mixed layer in the northern South China Sea ( SCS ) in spring, and to discuss the relevant mechanisms. The results show that the TKE model can simulate the main features of the time variables of the SST and mixed layer depth. In May and June, 1998, the daily oscillation of the SST was mainly determined by daily variation of the solar short wave radiation, which maintained the SST mainly and caused the SST increase by 1-4℃; the mixing effect of the wind restrained the daily oscillation of the SST . Compared with solar short wave radiation and wind stress, the latent heat and sensible heat flux are a minor factor in controlling the variable of the SST in spring. In May, both wind stress and solar short wave radiation control the depth of the upper mixed layer, and the effect of wind stress caused the mixed layer to grow to 5-10m, and the short wave radiation could reduce the mixed layer depth by 5-10m. However, in June, solar short wave radiation was smaller after summer monsoon onset, reducing the mixed layer depth only by 1-2m, and the latent heat and sensible heat flux further enhanced the mixed layer depth by more than 1-2m, with the depth of mixed layer being controlled mainly by wind stress.更多还原