2015年湖南上空水汽时空分布特征分析

利用2015年NCEP逐6 h再分析资料,获取大气可降水量特征因子和各气压层比湿特征因子,较全面地研究了湖南地区水汽在水平平面和垂直各层的日、月、季节时间与空间变化特征,探讨了2015年湖南上空水汽分布及演变特征.结果表明,湖南上空大气水汽含量随着高度的增加而减小,700 hPa以下中低层水汽占水汽总量的90%以上;大气可降水量由南至北递减;不同季节水汽含量夏秋季最大、冬春季最小,到秋季逐月下降;而不同季节水汽总量日变化春秋季最大、冬夏季最小.

Analysis of Temporal and Spatial Distribution of Water Vapor over Hunan Province in 2015

Using the NCEP 6 h reanalysis data in 2015 to obtain the characteristic factors of atmospheric precipitation and the characteristic factors of the specific humidity of each pressure layer, the daily, monthly and seasonal variations of water vapor in the horizontal and vertical layers in Hunan Province were comprehensively studied.The distribution and evolution characteristics of water vapor over Hunan Province in 2015 were discussed.The results showed that the atmospheric water vapor content in Hunan decreased with the increase of altitude, and the lower and middle water vapor below 700 hPa accounted for over 90% of the total water vapor;Water vapor was on the decrease from south to north.In different seasons, the water vapor content was the largest in summer and autumn, the smallest in winter and spring,and fell down month by month in autumn.The diurnal variation of total water vapor in different seasons was the largest in spring and autumn,the smallest in winter and summer.