青藏高原UTLS区域水汽输送特征分析

Characters of the Distribution and Variation of Water Vapor on the Qinghai-Tibet Plateau UTLS Area

研究水蒸气的分布和变化对全球气候变化具有一定的现实意义。基于欧洲中心(ECMWF)30年(1982年1月—2012年12月)0.5°×0.5°逐月比湿,纬向风和经向风资料的资料,初步分析了青藏高原UTLS(上对流层至下平流层)区域水汽分布及变化特征。结果显示:青藏高原地区上空对流层区域水汽分布存在明显的季节变化,在春季,对流层水汽含量增加;夏季,水汽的含量也达到了最高,同时,在反气旋环流的作用下,使对流层的水汽不断的向平流层输送;秋季,高原对流层水汽含量减少;冬季,水汽的含量下降至较低值,并且向平流层的水汽输送也逐渐减少。

Studying the distribution and variation of water vapor has some practical significance to global climate change.Based on the European Centre(ECMWF) 30 years(January 1982 to December 2012) monthly data with the resolution of 0.5°× 0.5°,specific humidity,zonal wind,meridional wind selected,a preliminary analysis to the character of the distribution and variation of water vapor on the Qinghai-Tibet Plateau UTLS area( upper troposphere to lower stratosphere) were carried out.The results showed that: The obvious presence of tropospheric water vapor distribution over the Tibetan Plateau region has a seasonal variation.In the spring,an increase in tropospheric water vapor content were appeared; In the summer,the content of water vapor also reached the highest.Under the influence of anti-cyclonic circulation,water vapor had transformed from troposphere to stratosphere; In autumn,the plateau tropospheric water vapor content had decreased; while in the winter,moisture content get its minimum,and may also reduced the water vapor transporting to stratosphere.