降水与副热带高压位置和强度变化的数值模拟

NUMERICAL SIMULATION ON THE PRECIPITATION AND VARIATION OF THE LOCATION AND INTENSITY OF THE SUBTROPICAL HIGH

利用国家气象中心的 T63业务数值模式 ,通过不同的对流潜热加热的敏感性试验 ,研究降水对西太平洋反气旋中、短期运动的影响 .结果表明 ,非绝热加热在垂直方向的不均匀将引起加热区附近风场的变化 ,从而影响到副热带高压位置和强度的改变 .而副热带高压的变化又会反过来影响降水区位置的变化 .由此证明 ,在中短期过程中 。

WT5BZ] The operational numerical weather forecasting model T63 is employed to study the impacts of precipitation on the movement of the anticyclone over the Western Pacific. Sensitivity experiments are designed by using different vertical profiles of convective latent heating. Results show that in response to the change of vertically non uniform diabatic heating, the in situ wind fields change correspondingly and thus the location and intensity of the subtropical high are changed. Meanwhile, the changed subtropical high also affects the location of precipitation. It is then concluded that in short and medium terms, there exists interaction between precipitation and variation of the subtropical high.