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Applying Helicity to Analysis of Torrential Rain over the Changjiang Gorges
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摘要: 用螺旋度分析了1982年7月16日三峡区间出现的近27年来最大一次暴雨。结果表明，①在垂直剖面图上，在雨区上空300 hPa附近，螺旋度有一个负的极小值中心；在600 hPa附近，有一个正的极大值中心。②300 hPa螺旋度分布图上的极小值中心位置，与主要雨区中心位置非常靠近，相距约60 km。Abstract: The helicity was applied to analyse a torrential rain event, which was the heaviest one during 1964~1990, occurred on July 16,1982 over the Changjiang Gorges. The results show that: (1) on the vertical section chart, there was a negative minimum center of the helicity near 300 hPa; and a positive maximum center of the helicity near 600 hPa over the heavy rain area. (2) on the 300 hPa chart, the center negative minimum of the helicity was most close to the center of the main heavy rain area, the distance between them was about 60 km
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Key words:
- Helicity;
- Changjing Gorges;
- Torrential rain
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