地球水循环系统是周而复始的,作为淡水资源最重要的来源,大气降水实际上来自海洋和陆地水的蒸发;水汽上升,在天空冷却凝结成云,再以雨、雪等形式降落到地面,渗入土壤,或形成径流汇入江河湖海;水再次蒸发,补给大气水汽,循环不已。空中云水资源主要分布在对流层大气中,集中在中低层的云里。据中国气象局的调查数 As the most important source of freshwater resources, the earth’s water cycle system actually comes from the evaporation of oceans and terrestrial waters. As the water vapor rises, it condenses into clouds in the sky and falls to the ground in the form of rain, snow and the like and penetrates into the soil , Or the formation of runoff into rivers and lakes and seas; water evaporated again, the supply of atmospheric water vapor, endless loop. Aerial cloud water resources are mainly distributed in the troposphere, concentrated in the middle and lower clouds. According to the China Meteorological Bureau survey