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A Suppositional Experiment about the Impact of Groundwater Drawdown on Regional Climate Change in Northwest China

BAO Yan1,2,LI Yao-hui1,CHEN Ren-sheng2,ZHANG Yu2,KANG Feng-qin1,WANG Xiao-yong3,SU Yong-hong2(1.Institute of Arid Meteorology,China Meteorological Administration,Lanzhou 730000,China;2.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China;3.Gansu Province Center of Meteorological Science and Technology Services,Lanzhou 73000,China)  
In this paper,the impacts of climate change caused actually by groundwater drawdown in arid and semiarid regions in northwest China are lucubrated using numerical simulation and a regional climatic model,and the feedback mechanism between groundwater drawdown and precipitation is analyzed.The results show that the serious groundwater drawdown in arid and semiarid regions in northwest China results in the distinctive climate effects,such as the sharp precipitation reduction,air temperature increase,drying of air near ground surface,change of boundary structure and ground-air flux exchange,and also affects strongly soil moisture regime.Thus,the low-atmospheric circulation in troposphere is changed,and the climate change in arid areas is affected.Although a suppositional experiment is carried out only,it reveals that groundwater drawdown affects seriously the soil moisture content,precipitation,water circle,climate change,etc.in arid areas.The results also show that it is necessary to consider the dynamic change of groundwater level and its impacts on precipitation,soil moisture content and surface water.
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