四川地区近60a大气可降水量分析  

Analysis on Precipitable Water in Sichuan in Recent 60 Years

作　　者：王维佳[1] 

机构地区：[1]四川省人工影响天气办公室,四川成都610072

出　　处：《干旱气象》2009年第4期346-349,357,共5页Journal of Arid Meteorology

基　　金：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

摘　　要：利用60a的NCEP2．5°×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181．30kg·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（74．33kg·m^-2），秋季次之，冬季最少；大气可降水量1月最少（5．82kg·m^-2），7月最多（25．77kg·m^-2），2月开始逐月增加，8月开始又逐月减少。60a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。60a来，大气可降水量在平均状态附近波动，略有减少。Based on the NCEP reanalysis data（2.5°×2.5°） from 1948 to 2007, this paper analyzed the long - term mean characteristics and the seasonal, annual and deeadal variations of precipitable water in Sichuan in recent 60 years. It is found that annual precipitable water in Sichuan is 181.30 kg ·m^-2, and the spatial distribution of precipitable water is obviously unequal with high in West Sichuan Plateau and low in Siehuan Basin. The preeipitable water varies with season obviously, which is most （74.33 kg ·m^-2） in summer and least in winter. The monthly precipitable water is least （5.82 kg ·m^-2 ） in January and most （25.77 kg ·m^-2 ） in July, and it increases from February while decreases from August. In recent 60 years, precipitable water waves around the average level with a slight downward tendency. Meanwhile, the preeipitable water in rainy years is 1.15 times as much as that in dry years.

关 键 词：NCEP再分析资料 大气可降水量 四川地区 年代际变化 

分 类 号：P468.024[天文地球—大气科学及气象学]