影响副高活动的热力强迫作用——动力学解析模型

The thermal forcing efficiency of influencing subtropical high activity—a simple dynamic analytical model

采用最优化搜索方法,对影响副高活动的东亚季风区位势场和季风雨带降水场进行了函数拟合,并用拟合出的函数作为基函数和热力强迫因子代入正压涡度方程,对涡度方程解的性质进行了讨论。分析和模拟结果表明:中心位于我国华北一带东亚季风雨带凝结潜热释放易导致副高的西伸和北抬;而中心位于赤道附近的南海季风槽降水热力作用可导致副高出现东退和西伸两种可能。

By using an optimization search technique,the potential height field and monsoon rainfall field of east-Asia monsoon region were fitted as some reasonable base-function,then the fitted function has been taken into the barotropic vorticity equation in the form of spatial base-function and thermal forcing factors,finally,the characteristic solution of the vorticity equation was analyzed and discussed.The analyzed and simulated results showed that the condensation latent heating over mid-northern China was easy to induce WPSH west-extending and north-advancing,and the rainfall condensation latent heating over south China Sea or near equator can induce WPSH both west-extending and east-receding.