国家自然科学基金项目41101035;教育部高校博士学科点专项科研基金项目20113424120002,20123424110001;淮河流域气象开放研究基金项目HRM201303National Science Foundation of China Grant No.41101035;Specialized Research Fund for the Doctoral Program of High Education of China Grant No.20113424120002, 20123424110001;Huaihe Basin Meteorological Open Research Fund Grant No.HRM201303