基于TES数据的亚洲大气水汽中δD空间分布特征研究

SPACE DISTRIBUTION OF δD IN ATMOSPHERIC WATER VAPOR BASED ON TES DATA OVER ASIA

基于TES反演的大气水汽及水汽中HDO数据,对亚洲大气水汽中δD在垂直和等压面上的分布特征进行了分析。在垂直方向上:多年平均显示δD值在对流层由低空向高空逐渐降低,最小值出现在80～100hPa的对流层顶,进入平流层后则随高度升高而增加;约从500hPa至对流层顶,等值线非常平直;在500hPa以下的对流层中低层,等值线则存在着波动。在等压面上:δD值的多年平均纬向分布明显,表现出随纬度增加而减小;在低纬地区的同纬度,δD值由海洋向大陆递减。δD的季节差异则显示在中纬度地区的亚洲大陆,ΔδD为正值且自西向东正值的分布范围、大小均逐渐减小;在低纬和高纬地区,ΔδD值则均为负值;在同纬度地区,海洋上的ΔδD明显小于陆地。另外,发现平流层的等压面上,δD的多年平均、季节差异均表现出与对流层相反分布的特点。

Based on retrievals of atmospheric water vapor and HDO from the TES,space distribution of δD in atmospheric water vapor over Asia is studied.In the vertical direction,the annual average δD is decreasing with altitude in the troposphere,minimizing at 80~100 hPa in the tropopause,and increasing with altitude in the stratosphere.δD isoline is straight between 500 hPa and tropopause,and shows more fluctuant below 500 hPa.In the isobaric surface,the annual average δD shows marked zonal distribution in the troposphere,and generally decreases with latitude.δD decreases from ocean to mainland at same latitude in low latitude area.The seasonal differences are positive in the Asian continent which is at middle latitude.Both the magnitude and the distribution scope of positive ΔδD values are gradually decreasing from west to east.ΔδD values is negative both at low latitude and high latitude area.ΔδD values in ocean is significantly lower than that in land at the same latitude.In addition,we find that distribution of both annual average and seasonal differences of δD in the isobaric surface in the stratosphere is contrary to that in the troposphere.