利用NOAA AVHRR数据研究北半球雪盖气候学特征

CLIMATIC CHARACTERISTICS OF THE SNOW COVER OVER THE NORTHERN HEMISPHERE OBSERVED BY SATELLITE

利用NOAA卫星图像,研究了北半球、欧亚、北美和青藏高原雪盖气候学特征及其变化趋势。指出北半球、欧亚和北美雪盖气候变化趋势基本一致,年均雪盖面积在1987年前后明显下降;而青藏高原雪盖面积在1984年后明显下降,说明青藏高原雪盖的年际变化与北半球及欧亚、北美不完全一致。

Climatic characteristics and changes of snow cover over the Northern Hemisphere, the Eurasian Continent, North America and Tibet Plateau were studied based on data of the Northern Hemisphere snow cover area observed by satellite remote sensing from 1966 to 2000. The result shows that the climatic changes are almost the same over such regions as the Northern Hemisphere, the Eurasian Continent and North America, and that an obvious reduction of snow cover area occurred around 1987. Nevertheless, the reduction of the snow cover area in Tibet Plateau happened around 1984. It shows that the internal annual snow cover variation in Tibet Plateau is not quite in agreement with that in other regions.