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梅雨锋暴雨的不平衡场
The Imbalance Field of the Heavy Rainfall in the Meiyu Front
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摘要: 中尺度散度及其变化和梅雨锋暴雨有较好的对应关系。在散度方程中，散度的局地变化项与垂直速度（ω）、散度（D）有关的项的量级在强降水区比在弱降水区要大。用中尺度资料计算的不平衡场（U）和不均匀场（A）和强降水区基本一致。因此，计算不平衡场和不均匀场及散度变化可以为暴雨等中尺度天气现象的短时预报提供线索。Abstract: The mesoscale divergence and its change are in good coincidence with the heavy rainfall in the Meiyu front. The orders of the divergence change and the terms related to vertical velocity (ω) and divergence (D) in divergence equation are larger in the region of heavy rainfall than in the region of weak rainfall. The low—level imbalance field (U) and nonhomogeneous field (A) that are calculated using mesoscale data coincide with the region of heavy rainfall. Calculation of these field and divergence change can provide important information for the nowcast of the mesoscale weather phenomena such as heavy rainfall
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