Journal of Arid Meteorology ›› 2009, Vol. 27 ›› Issue (4): 346-349.

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Analysis on Precipitable Water in Sichuan in Recent 60 Years

 WANG Wei-Jia   

  1. (WeatherModification Office ofSichuan Province, Chengdu610072, China)
  • Received:2009-07-07 Revised:2009-09-10 Online:2010-12-30 Published:2009-12-30

四川地区近60 a大气可降水量分析

王维佳   

  1. 四川省人工影响天气办公室,四川 成都 610072
  • 作者简介:王维佳(1980-),女,工程师,主要从事人工影响天气业务和研究. E-mai:l wjwang999@ sohu. com
  • 基金资助:

    四川省气象局应用开发课题“四川省空中水资源评估技术研究”(应08 -14),国家“十一五”科技支撑计划重大课题(2006BAD04807-3)共同资助
      

Abstract:

Based on theNCEP reanalysis data(2. 5°×2. 5°) from 1948 to 2007, this paper analyzed the long-term mean characteristics and the seasona,l annual and decadalvariations ofprecipitablewater in Sichuan in recent60 years. It is found thatannualprecipitablewater in Sichuan is 181. 30 kg·m-2, and the spatialdistribution ofprecipitablewater is obviously unequalwith high inWestSichuan Plateau and low in Sichuan Basin. The precipitable water varies with season obviously, which ismost (74. 33 kg·m-2) in summer and least in winter. Themonthly precipitablewater is least(5. 82 kg·m-2) in January andmost(25. 77 kg·m-2) in July,and it increases from Februarywhile decreases from August. In recent60 years, precipitablewaterwaves around the average levelwith a slightdownward tendency. Meanwhile, the precipitablewater in rainy years is 1. 15 times asmuch as that in dry years.

Key words: NCEP reanalysis data, precipitablewater, Sichuan, interdecadal variation

摘要:

 利用60 a的NCEP 2. 5°×2. 5°再分析资料,分析了四川地区大气可降水量的长期平均特征及其季节、年际与年代际变化。结果表明:四川地区年大气可降水量为181. 30 kg·m-2;大气可降水量的空间分布明显不均匀,川西高原的大气可降水量明显低于四川盆地;大气可降水量季节变化显著,一年中夏季(6~8月)最多(74. 33 kg·m-2),秋季次之,冬季最少;大气可降水量1月最少(5. 82 kg·m-2), 7月最多(25. 77 kg·m-2), 2月开始逐月增加, 8月开始又逐月减少。60 a中大气可降水量年际变化小,丰年大气可降水量为枯年的1. 15倍。60 a来,大气可降水量在平均状态附近波动,略有减少。

关键词: NCEP再分析资料, 大气可降水量, 四川地区, 年代际变化

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