| 拉萨地区汛期积状云及其人工增雨作业研究 |
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| 引用本文： | 央金卓玛,杨刚,周洪莉,余忠水.拉萨地区汛期积状云及其人工增雨作业研究[J].四川气象,2013(4):69-73. |
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| 作者姓名： | 央金卓玛 杨刚 周洪莉 余忠水 |
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| 作者单位： | 西藏自治区人工影响天气中心,拉萨850000 |
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| 摘 要： | 本文利用拉萨地区1981 ～2010年汛期5～9月4个台站的地面观测资料,统计分析了汛期5～9月各类积云的发生频率及其降水过程,分析了各类积云的降水能力;从卫星云图、天气雷达图识别及目测三个方面对拉萨地区汛期适宜高炮（火箭）人工增雨作业云系做了初步探讨.结果表明：拉萨地区平均每年有40d以上的积云降水;其中伴随碎雨云的积雨云（Cb＋Fn）降水概率最大.各县区平均积云降水过程占总降水过程的52.6％,平均积云降水量占总降水量的54.8％;汛期降水过程中由积云带来的降水占一半以上,一般产生小雨及小到中雨的雨量,产生大雨及暴雨的概率极小.降水性积云不仅人工增雨潜力很大,实施人工增雨催化作业的机会也较多.适合人工增雨作业影响的积云降水云系按其对降水量的贡献大小依次为伴随碎雨云出现的积雨云（Cb＋ Fn）、伴随碎积云出现的混合层积云（Sc＋Fc）、积雨云（Cb）、层积云（Sc）.
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| 关 键 词： | 积云 人工增雨 汛期 拉萨 西藏 |
Analysis on Cumulus Clouds and Cloud System of Artificial Rainfall Operation during Raining Season in Lhasa Area |
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| YANG Chendolma,YANG Gang,ZHOU Hongli,YU Zhongshui.Analysis on Cumulus Clouds and Cloud System of Artificial Rainfall Operation during Raining Season in Lhasa Area[J].Journal of Sichuan Meteorology,2013(4):69-73. |
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| Authors: | YANG Chendolma YANG Gang ZHOU Hongli YU Zhongshui |
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| Institution: | ( The Tibet Autonomous Region Centre of Weather Modification,Lhasa 850000, China) |
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| Abstract: | In this paper, the frequency, rainfall process and rainfall ability of various cumulus clouds are analyzed using the ground observation data from 4 meteorological stations in Lhasa area during raining season from May to September of 1981 to 2010. The preliminary discussion for cloud system suitable for artificial rainfall operation in Lhasa area using antiaircraft gun （rockets） is also made from satellite cloud image, radar map and visual inspection. The result shows that annual average rain- fall caused by cumulus cloud is over 40 days in Lhasa area with maximum rainfall frequency of cumulus clouds along with fracto - nimbus （Fn）. Average rainfall process of cumulus clouds is accounting for 52.6% in total rainfall process and its rainfall a- mount is 54.8% of total rainfall in different counties of Lhasa. The rainfall process caused by cumulus cloud is over half of to- tal rainfall during raining season, which generally produces light, light to moderate rain and the probability of producing heavy rain and storm is very small. Therefore, there are not only great artificial rainfall potentials but also more opportunities to imple- ment artificial rainfall seeding in precipitating cumulus. Cumulus cloud system which is suitable for artificial rainfall operations based on their contribution to rainfall amount in order is cumulonimbus with fracto - nimbus （ Cb ＋ Fn）, mixed stratocumulus with fractocumulus （ Sc ＋ Fc） , cumulonimbus （Cb） and stratocumulus （Sc）. |
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| Keywords: | cumulus cloud artificial rainfall enhancement raining season Lhasa Tibet |
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