Surface energy and water vapor fluxes observed on a megadune in the Badain Jaran Desert, China

作     者：HU Wenfeng WANG Nai'ang ZHAO Liqiang NING Kai ZHANG Xunhe SUN Jie 

作者机构：Center for Climate Change and Hydrologic Cycle in Arid Region College of Earth and Environmental Science Lanzhou University College of Geographical Science and Tourism Xinjiang Normal University 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2015年第7卷第5期

页      面：579-589页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by Special Fund for National Environmental Protection Industry Scientific Research in the Public Welfare (201209034) the National Natural Science Foundation of China (41371114) the Fundamental Research Funds for the Central Universities (lzujbky-2-14-275) 

主　　题：eddy covariance technology energy and water vapor fluxes precipitation evaporation 

摘      要：The Badain Jaran Desert is the second-largest area of shifting sands in China. Our first measurements of the energy components and water vapor fluxes on a megadune using eddy covariance technology were taken from April 2012 to April 2013. The results indicate that the Iongwave and shortwave radiative fluxes exhibited large fluctuations and seasonal dynamics. The total radiative energy loss by Iongwave and shortwave radiation was greater on the megadune than from other underlying surfaces. The radiation partitioning was different in different seasons. The land-atmosphere interaction was primarily represented by the sensible heat flux. The average sensi- ble heat flux （40.1 W/m2） was much larger than the average latent heat flux （14.5 W/m2）. Soil heat flux played an important role in the energy balance. The mean actual evaporation was 0.41 mm/d, and the cumulative actual evaporation was approximately 150 mm/a. The water vapor would transport downwardly and appear as dew con- densation water. The amount of precipitation determined the actual evaporation. The actual evaporation was sup- posed to be equal to the precipitation on the megadune and the precipitation was difficult to recharge the ground- water. Our study can provide a foundation for further research on land-atmosphere interactions in this area.