Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 19 2007 10.5194/acp-7-5197-2007 http://www.atmos-chem-phys.net/7/5197/2007/ http://www.atmos-chem-phys.net/7/5197/2007/acp-7-5197-2007.html http://www.atmos-chem-phys.net/7/5197/2007/acp-7-5197-2007.pdf 5197 5206 2007-10-09 A scheme for calculating soil moisture content by using routine weather data K. Z. Shang kezheng_shang@yahoo.com.cn S. G. Wang Y. X. Ma Z. J. Zhou J. Y. Wang H. L. Liu Y. Q. Wang Gansu Key Laboratory of Climate Change and Reducing Disaster, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, P.R. China National Meteorological Center, CMA, Beijing 100081, P.R. China Chinese Academy of Meteorological Sciences, CMA, Beijing 100081, P.R. China Soil moisture content is one of the most important parameters as input conditions in forecasting model systems of dust storm, but it can not be directly obtained from daily routine weather report. In this paper, a scheme is developed to calculate the surface soil moisture content in China by using both precipitation and evaporation. Precipitation is directly from routine weather report, while evaporation is indirectly calculated by using meteorological elements which are also from routine weather report. According to the formula by Penman, evaporation can be considered as a linear composition of dynamic evaporation and thermodynamic evaporation caused by radiation. First, an equation for calculating daily global radiation within China is given by using regression analysis and the data of global radiation and cloud cover from 116 meteorological stations in China. Then, an equation for calculating evaporation within China is given by using regression analysis and the data of cloud cover, air temperature, precipitation, relative humidity, and wind velocity from 701 meteorological stations. 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