中国北方旱区陆地水储量变化特征及其归因分析  

Characteristic and cause analysis of terrestrial water storage change in drylands of northern China

作　　者：安琳莉 黄建平[1] 任钰 张国龙[1] AN Linli;HUANG Jianping;REN Yu;ZHANG Guolong(Collaborative Innovation Center for West Ecological Safety,College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学西部生态安全协同创新中心,兰州大学大气科学学院,甘肃兰州730000

出　　处：《干旱气象》2022年第2期169-178,共10页Journal of Arid Meteorology

基　　金：国家自然科学基金项目(41991231,42041004)资助。

摘　　要：基于重力反演与气候实验(Gravity Recovery and Climate Experiment,GRACE)卫星观测数据分析中国北方旱区近20 a的陆地水储量变化,并结合多种观测和模式数据分析其变化特征和原因。结果表明,2002—2020年中国北方旱区陆地水储量以每年17.80±1.72 Gt的净速率下降。地下水、根区土壤水和表层土壤水均不同程度减少。归因分析发现:在中国北方旱区,地表升温和人为耗水等因素造成蒸散大量增加。蒸散的负向贡献超过同期降水的正向贡献,使得区域净水储量持续减少,区域水资源压力攀升。因此,需要在中国北方旱区采取更有效的节水措施和建立全面的水资源监测系统。Based on GRACE(Gravity Recovery and Climate Experiment) satellite products,the TWS changes were calculated in drylands of northern China during the past two decades.And on this basis,the characteristics and causes of TWS changes were explored by using multi-source observations and model simulations.The results show that TWS in drylands of northern China decreased with a rate of 17.80±1.72 Gt per year during 2002-2020,which was also accompanied by various degrees of reduction in groundwater,root zone soil moisture and surface soil moisture.In drylands of northern China,the effects,such as climate warming and human water consumption,caused a substantial increase of evapotranspiration.The negative contributions of evapotranspiration overpassed the concurrently positive contributions of precipitation,and thus led to the decrease in TWS and increase in regional water stress.

关 键 词：陆地水储量 中国北方旱区 降水 蒸散 

分 类 号：P344[天文地球—水文科学]