摘要
利用１９９５～１９９７年静止气象卫星（ＧＭＳ）红外通道的数据，采用综合了时间判断法、空间判断法和红外阈值法等特征的一种综合判断有云无云的方法，统计分析了中国地区较高空间分辨率（优于２０ｋｍ）和时间分辨率（优于１ｈ）的晴空概率和天文夜晴空概率的分布．分析结果表明，全年天文夜晴空概率的极值出现在我国的西部和北部．冬半年的最大天文夜晴空概率值大于夏半年．其中西藏地区１２月的天文夜晴空概率可达到９５％．
using infrared cloud imagery data of Geostationary Meteorological satellite(GMS)between 1995~1997, and a combined, temporal, spatial and infrared threshold criterion forcloud, we analyze the probability distributions of clear sky and clear astronomical night skyover China with a spatial resolution better than 20km and a temporal resolution betterthan 1 hr. The results show that the peak in the probability distribution of astronomicalnight sky over the whole year occurs in the western and northern parts of our country, thatthe maximum probability of astronomical night sky is higher in the winter half of the yearthan in the summer half and that the probability of astronomical night can be as high as95% in December in Tibet Region.
基金
中国科学院天文委员会基金
