1、海拔.海拔高,空气稀薄,太阳辐射在到达地表前经过的大气路径短,大气对太阳辐射的削弱作用小,太阳辐射量大.
2、天气.云雨少,晴天多,日照时间长,太阳辐射量大.
3、大气洁净度.大气越纯净,太阳辐射越强.
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