Abstract: A large number of lakes are distributed in the Badain Jaran Desert located in northwest China.Water evaporation is a key factor in lacustrine water cycle and even an entire desert.In this paper,the dynamic relationships between evaporation and meteorological factors were analyzed based on the long-term meteorological and evaporative data monitored by automatic weather station at the Sumu Barun Jaran Lake from September 11,2012 to March 26,2013 and from May 8,2013 to June 23,2015 as well as the pressure intensity data at the lake bottom observed from September 13,2012 to June 20,2014.The multiple linear regression model,nonlinear aerodynamic model and Penman equation were used to simulate and analyze the hourly,daily and monthly evaporations.The results indicated that the correlations between evaporation and meteorological factors were enhanced with the time prolonging.At the hourly time scale,the correlations between evaporation and meteorological factors were poor,and the evaporation could not be simulated well by the multiple linear regression model.At the daily and monthly time scales,evaporation was closely correlated with air temperature and water temperature in the same period,and the evaporation could be modeled well by the multiple linear regression model and nonlinear aerodynamic model.The daily evaporation modeled by Penman equation was higher in summer but lower in winter.The results could provide a scientific basis for assessing the water consumption by lake surface evaporation in desert.

Key words: lake, evaporation, meteorological factor, multiple linear regression, Sumu Barun Jaran, Badain Jaran Desert