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西南地区云水量与可降水量比值的分布特征和变化趋势

林 丹王维佳   

  1. 四川省人工影响天气办公室,四川 成都 610072  
  • 收稿日期:2013-03-26 修回日期:2013-06-08 出版日期:2013-09-30 发布日期:2013-09-30
  • 作者简介:林丹(1987 - )女,四川成都市人,助理工程师,主要从事应用气象和大气物理方面研究以及人工影响天气业务工作. E - mail:ld8768@ hotmail. com
  • 基金资助:

    西南区域气象中心 2011 年区域重大科研业务项目“西南地区空中云水资源评估和开发利用研究”(西南区域气 2011 -02)资助

     

Trend and Distribution Features of Ratio of Cloud Water to Precipitable Water in Southwest China  

LIN DanWANG Weijia   

  1. Weather Modification Office of Sichuan Province,Chengdu 610072,China
  • Received:2013-03-26 Revised:2013-06-08 Online:2013-09-30 Published:2013-09-30

摘要:

采用 1980 ~2009 年云水量和可降水量的 NCEP 逐月再分析资料,通过统计分析,研究 30 a 来西南地区(云南、贵州、重庆、四川)云水量与可降水量比值的时空分布特征和变化趋势。结果表明:(1)西南地区年、季节云水量与可降水比值均具有明显的地区性差异,由西北向东南递减,高值区位于川西高原;(2)云水量与可降水比值年内分布不均匀,从 2 月到 8 月逐渐减小,9 月至 1 月逐渐增大,同时,季节差异较大,夏季最小,冬季最大;(3)30 a 来,整个西南地区年、夏季和秋季云水量与可降水量比值呈显著减少趋势。

关键词: 西南地区, 可降水量, 云水量, 演变特征

Abstract:

Based on NCEP monthly cloud water and precipitable water data from 1980 to 2009,the spatial and temporal distribution
characteristic and variation trend of ratio of cloud water to precipitable water in southwest China were analyzed in this paper. The results
show that the annual and seasonal ratio of cloud water to precipitable water in southwest China had obvious regional difference,which
decreased from northwest to southeast,and the high value was located in Western Sichuan Plateau. Ratio of cloud water to precipitable
water decreased from February to August,and increased from September to January in a year,and the ratio was minimum in summer
and maximum in winter. There was a clear downward trend for annual ratio of cloud water to precipitable water in 30 years,and the ra-
tio also decreased in summer and autumn.

 

Key words:  southwest China, precipitable water, cloud water, spatial and temporal characteristic

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