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本文利用Sawyer—Eliassen急流—锋面型非地转次级环流流函数方程,对中国东部一次入海气旋的数值模拟结果进行诊断计算和分析。结果得出:(1)中纬度入海气旋发展过程中非地转次级环流具有明显的变化特征。(2)潜热释放是产生非地转次级环流的主要因子,对中纬度入海气旋的发展加深有重要作用。(3)积云混合强迫中,积云热量混合起主要作用。(4)海温异常不仅通过海洋感热通量,而且通过潜热释放和地转形变等因子影响气旋系统及其次级环流的发展。海温水平梯度及大范围的海温异常对气旋暖区的降水有重要影响。
In this paper, the Sawyer-Eliassen jet-front non-geostrophic circulation function equation is used to diagnose and analyze the numerical simulation results of a cyclone entering the sea in eastern China. The results are as follows: (1) The non-geostrophic secondary circulation in the process of mid-latitude sea entry has obvious variation characteristics. (2) Latent heat release is the main factor of non-geostrophic circulation, which plays an important role in deepening the development of cyclone at mid-latitude. (3) Cumulus mixed force, cumulus heat mixing plays a major role. (4) SST anomalies affect the development of the cyclone system and its secondary circulation not only through ocean sensible heat flux, but also through factors such as latent heat release and geodetic deformation. SST anomaly and large-scale SST anomalies have an important impact on the precipitation in cyclone warm area.