Recent secular variations in the extent of Northern Hemisphere snow cover
Recent secular variations in the extent of Northern Hemisphere snow cover
复制标题
DOI：
10.1029/gl017i010p01557
复制
发表时间：
1990-09
影响因子：
5.2
通讯作者：
D. Robinson;K. Dewey
中科院分区：
文献类型：
--
作者：
D. Robinson;K. Dewey
1988年和1989年北半球的积雪面积达到自1972年出现可靠的卫星积雪监测以来的最低程度；比 18 年平均 2570 万平方公里低 8% 至 10%。在这两年中，记录期间的月度最低值出现了六次。总的来说，卫星记录的最后九年的覆盖范围没有 1972-80 年期间那么广泛。 20 世纪 80 年代，欧亚大陆所有季节的负异常最为严重，北美春季的负异常最为严重。最近九年的半球季节性平均值比 1972 年至 1980 年低 3.7% 至 8.4%。结果基于对国家海洋和大气管理局每周积雪图的分析，这些图是根据可见卫星图像生成的。
Northern hemisphere snow cover during 1988 and 1989 was at its lowest extent since the advent of reliable satellite snow-cover monitoring in 1972; running some 8–10% below the eighteen-year annual mean of 25.7 million km2. Monthly minima for the period of record occurred six times during these two years. In general, the last nine years of the satellite record had less extensive cover than the 1972–80 interval. Negative anomalies during the 1980s were largest over Eurasia in all seasons, and in the Spring over North America. Hemispheric seasonal means for the most recent nine years were 3.7% to 8.4% lower than those between 1972 and 1980. Results are based on analyses of National Oceanic and Atmospheric Administration weekly snow charts, which are produced from visible satellite imagery.