NOAA卫星遥感与常规观测中国积雪的对比研究

利用30 a来NOAA卫星遥感和常规观测的中国积雪资料, 对比研究了二者在不同季节和不同年代的逐月积雪日数.研究表明: 全年、秋季、冬季和春季全国64%以上地区卫星遥感与常规观测的月积雪日数显著相关, 其中东北(包括内蒙东部)和北疆地区显著相关; 华北和内蒙中部冬季相关最为显著; 青藏高原相关程度明显偏低.值得注意的是, 高原上无测站分布地区对于NOAA卫星遥感的高原空间平均年积雪日数影响不显著.NOAA卫星遥感与常规观测的青藏高原空间平均全年积雪日数未达到显著相关, 二者年际变化存在一定差异.

Snow Cover in China, Derived from NOAA Satellite Remote Sensing and Conventional Observation

Based on NOAA satellite remote sensing data and conventional observations of snow cover in China, a comparison was conducted on snow cover in China is carried out. It is found that correlation between coefficient of monthly number of snow cover days from NOAA satellite data and furfacesurface ground station observations is was significant at 95% level in more than 64% areas of China. In North East (including east of Inner Mongolia) and northern Xinjiang, the correlation coefficient is highly significant. In North China and central middle of Inner Mongolia, the correlation coefficient is more significant in winter. The correlation coefficient in the Tibetan Plateau is lower as compared with other regions. According to NOAAoaa satellite data, the correlation of the regions where there is is no surface observations for ground to the number of snow cover days in the Tibet Plateau is not significant. The relationship between annual spatial mean numbers of snow cover days in the Tibet Plateau derived from satellite remote sensing and from station observations is insignificant. In general, variation of annual number of snow cover days in the Tibetan Plateau derived from NOAA satellite data and ground observation is different.