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本文根据1978—1987年OSL的可见光影像及地面台站积雪记录,评价了NASA的用微波亮温反演积雪深度的算式。还根据DEM资料,用GIS技术把中国西部分成高山、高原、低山、丘陵及盆地五个单元,分别求得各区域订正算式,并以此计算了中国西部1978—1987年各季的平均雪盖率与雪量及它们的年际变化,为本区积雪影响东亚气候研究,提供了可靠基础资料。
Based on the OSL visible light images from 1978 to 1987 and the snow records from the ground station, this paper evaluates NASA’s snow depth inversion algorithm using microwave brightness temperature. Based on the DEM data and the GIS technology, the western part of China is divided into five units: alpine, plateau, hilly, hilly and basin, and the correction formulas for each region are respectively calculated. Based on this, the average snow in western China from 1978 to 1987 The coverage rate and amount of snow and their annual variation provide a reliable basis for the research on the influence of snow on the East Asian climate in this area.