【摘要】 基于NCEP/NCAR逐日再分析资料及同期逐日降水数据,分析了珠江流域1981~2010年多年平均状况下水汽含量、水汽输送通量和水汽输送通量散度特征,并与流域降水分布特征做了对比分析。结果表明,多年平均水汽含量与年降水量空间分布较为一致,均从西北向东南逐渐增大,而降水时空分布更为复杂;水汽输送季节变化特征具有过渡性和周期性,与水汽输送通量散度变化特征相一致,与降水的季节变化相对应。更多还原

【Abstract】 Based on the NCEP/NCAR daily reanalysis data and precipitation daily data at the corresponding period, the annual average characters of water vapor content,water vapor transport flux and water vapor transport flux divergence are analyzed,which are compared with that of the distribution of precipitation in Pearl River basin from 1981to 2010.The results show that the whole-level water vapor content is similar to average annual precipitation on spatial distribution and both gradually increase from northwest to southeast;however,the temporal and spatial distribution of the precipitation is more complex;the character of water vapor transportation varies transitionally and periodically in four seasons in consistence with that of divergence,which is in response to the variety of precipitation.更多还原