引入切变风螺旋度和热成风螺旋度，并将其应用于东北冷涡暴雨的诊断分析。
The shearing wind helicity and thermal wind helicity are introduced and applied to a northeastern cold vortex rainfall event.
主要结果为：(1)初夏东北冷涡活动显著异常与上游乌拉尔山附近和下游日本附近的持续性异常环流相对应。
It is shown that: (1) the anomalous cold vortex activity in Northeast China in the early summer is quite in concert with persistent circulation anomalies near the Ural Mountains and Japan.
主要结果为：(1)初夏东北冷涡活动显著异常与上游乌拉尔山附近和下游日本附近的持续性异常环流相对应。
It is shown that: (1) the anomalous cold vortex activity in Northeast China in the early summer is quite in concert with persistent circulation anomalies near the Ural Mountains and Japan.
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