摘要
针对现有水文循环要素研究中较少关注近地面水汽的问题,以西北地区为例,应用NCEP/NCAR再分析资料分析了水汽垂直分布特征,采用趋势分析法研究了近地面水汽分布特征及其与区域蒸发的响应关系。分析结果界定了西北地区的近地面水汽层,水汽空间分布受地形地势影响十分显著,近50年来近地面水汽含量呈减少的趋势,并与区域蒸发量的变化呈正相关关系,蒸发量减少是造成近地面水汽含量减少的主要因素。
Aiming at the problem of water vapor content near the surface seldom paid attention to the research of hydrologic cycle process, taking northwest China for an example, the vertical distribution characteristics of water vapor content is analyzed with the NCEP/NCAR reanalysis data. And then the relationships between water vapor content near the surface and regional evaporation are analyzed by using the method of tendency analysis. Water vapor layer near the surface is defined in terms of analysis results. The results show that the spatial distribution of water vapor content near the surface is influenced by the regional terrain significantly and it has a decrease trend in recent 50 years, which has a positive correlation between water vapor content near the surface and the regional evaporation. So, it can be deduced that the decease of regional evaporation is a key factor of water vapor content decrease.
出处
《水电能源科学》
北大核心
2012年第12期1-5,共5页
Water Resources and Power
基金
国家自然科学基金资助项目(41101014)
中央高校基本科研业务费专项资金资助项目(2009B06114)
关键词
近地面水汽
区域蒸发
水文循环
西北地区
water vapor content near the surface
regional evaporation
hydrologic cycle
northwest China
