云南初夏罕见暴雨的螺旋度分析

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基金项目: 云南应用基金项目(2000D0091M);云南省"十·五"攻关项目(2001NG43)共同资助

HELICITY ANALYSIS FOR HIGH-WIND AND UNCOMMON RAINSTORM PROCESSES OVER YUNNAN IN EARLY SUMMER

摘要: 应用螺旋度理论,对2001年初夏(5～6月)云南罕见的暴雨天气过程进行了诊断分析,结果表明:暴雨产生在低层700hPa正的h_p螺旋度与不稳定能量区重叠的区域内,其变化对天气系统的移动、发展及暴雨的落区和强度有一定的指示意义;暴雨区上空h_p螺旋度呈高层负中心、低层正中心分布;螺旋度还反映了大气垂直运动分布特征和旋转状况。
- 暴雨 /
- 螺旋度 /
- 诊断分析
Abstract: The helicity was applied to analyze several high-wind and rainstorm processes,which occurred from May to June,2001 over Yunnan in early summer. The results of diagnostic analyses show that the rainstorm occurs in the area which h_p is positive at 700hPa and energy is unstable. The change of helicity can reflect the movement and development of synoptic system and the position and intensity of the rainstorm. The value of h_p is a negative center at upper level and a positive at lower level over the rainstorm position; moreover it can reflect the characters of vertical distribution and rotational motion.
- rainstorm /
- helicity /
- diagnostic analyses

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