YIN Shuyue,ZHOU Yunjun,GAO Zhibo,et al.Analysis of Stratification Conditions for Formation of Cumulonimbus Clouds in Chengdu[J].Journal of Chengdu University of Information Technology,2019,(02):149-161.[doi:10.16836/j.cnki.jcuit.2019.02.009]
成都积雨云形成的层结条件分析
- Title:
- Analysis of Stratification Conditions for Formation of Cumulonimbus Clouds in Chengdu
- 文章编号:
- 2096-1618(2019)02-0149-13
- Keywords:
- atmospheric physics; cumulonimbus cloud; atmospheric stratification; convection index; southwest vortex; shear line
- 分类号:
- P426.5+1
- 文献标志码:
- A
- 摘要:
- 为了研究成都积雨云发生时的层结条件,采用中国气象局的探空资料和地面观测资料统计了成都地区2009-2013年积雨云出现时的对流指数和500 hPa、700 hPa、850 hPa 3个层次的物理量,分析了西南涡、低空切变线、低空急流4个影响系统下积雨云产生时的各指数演变图,得出以下结论:(1)春季,K指数在22 ℃～34 ℃, SI在1 ℃～8 ℃,对流稳定指数在-1 ℃～12 ℃,抬升指数在0 ℃～7 ℃,A指数在0 ℃～14 ℃,成都易有积雨云产生。(2)夏季,K指数在33 ℃～41 ℃,SI在-2 ℃～3 ℃,对流稳定指数在-15 ℃～2 ℃,抬升指数在-3 ℃～1 ℃,A指数在2 ℃～15 ℃,成都易有积雨云产生。(3)秋季,K指数在29 ℃～39 ℃,SI在-2 ℃～5 ℃,对流稳定指数在-13 ℃～5 ℃,抬升指数在-2 ℃～4 ℃,A指数在3 ℃～15 ℃,成都易有积雨云发生。
- Abstract:
- In order to study the stratification conditions of cumulonimbus clouds in Chengdu, the convection index of cumulonimbus clouds in Chengdu from 2009 to 2013 and the physical quantities at three levels of 500 hPa,700 hPa and 850 hPa were calculated by using the sounding data and ground observation data from China Meteorological Administration. The exponential evolution diagrams of cumulonimbus clouds under the four influence systems of southwest vortex, low-altitude shear line and low-altitude jet are analyzed, and the following conclusions are obtained:(1)In spring, the K index is between 22 ℃ and 34 ℃, SI is between 1 ℃ and 8 ℃,convection stability index is between 1 ℃ and 12 ℃, uplift index is between 0 ℃ and7 ℃ and A index is between 0 ℃ and 14 ℃.(2)In summer,K index is between 33 ℃ and 41 ℃, SI is between -2 ℃ and 3 ℃, convection stability index is between -15 ℃ and 2 ℃,uplift index is between -3 ℃ and1 ℃,A index is between 2 ℃ to 15 ℃. It is easy to produce cumulonimbus clouds in Chengdu.(3)In autumn, the K index is between 29 ℃ and 39 ℃,the SI index is between -2 ℃ and 5 ℃, the convection stability index is between -13 ℃ and 5 ℃, and the uplift index is between -2 ℃ and 4 ℃,A index between 3 ℃ and 15 ℃ and the cumulonimbus is easy to occur in Chengdu.
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备注/Memo
收稿日期:2018-06-11