【摘要】 利用NCEP/NCAR全球1948~2003年共56年月平均再分析网格点(2.5°×2.5°)资料,计算并分析了川渝地区(100~110°E,25~35°N)空中水资源的逐年变化特征、时空分布、水汽输送特征、水汽收支状况以及大气可降水能力。结果表明:近56年来,川渝地区整层水汽含量总体是略呈下降趋势,但夏冬两季水汽呈上升态势;区域内水汽含量的水平分布表现为以四川盆地东南部至重庆涪陵为湿中心,自东南向西北逐渐减少的趋势;水汽输送以西南和东南方向为主;全年水汽收支呈现净输入的状态;秋、夏、春三季皆有较大的可降水量,空中潜在水资源丰富。更多还原

【Abstract】 On the basis of the NCEP/ NCAR monthly mean reanalysis data for global 56 years from 1948 to 2003,this paper studies the year-by-year variation characteristics and the temporal-spatial distribution characteristics of in-the-air water resource in the region of Sichuan and Chongqing(100~110°E,25~35°N),the water vapor transportation characteristics there,the water vapor receipts and expenditure condition there,the precipitation capability of the atmosphere there.The results show that: in the recent 56 years the content of the whole layer water vapor has declined a little on the whole in the region of Sichuan and Chongqing,while water vapor in summers and winters has increased gradually;in this region,the level distribution of the water vapor content performance for the wet center on Southeast Sichuan Basin to Fulin of Chongqing,which trends decreasing gradually from southeast to northwest;the water vapor transports southwest and southeast principally;the water vapor receipts and expenditure of the whole year appear clean importing;relatively large achievable precipitation amount exists in autumn,summer and spring,with abundant potential water resource in the air.更多还原