基于MODIS双卫星积雪遥感数据的积雪日数空间分布研究

Validation of MODIS Snow Covered Days by the Combined Using of MODIS Aqua and Terra Snow Cover Products and In-Situ Observations All over China

结合Terra和Aqua卫星的积雪产品,获取2001—2006年全国新的逐日积雪覆盖数据,并利用此数据通过两种方案获取了全国积雪日数分布,对比发现3大稳定积雪区中,新疆地区积雪稳定性及连续性最好,东北其次,而青藏高原地区最差;通过595个气象台站年积雪日数数据分区分不同植被类型修正MODIS获得的年积雪日数.结果表明:我国稳定积雪334.4×104 km2,不稳定积雪区490.6×104 km2.东北-内蒙古地区、青藏高原和新疆地区稳定积雪面积分别为117.9×104 km2、153.7×104 km2和56.8×104 km2.

New snow cover products are produced by combination of Aqua and Terra MODIS snow cover products from 2001.Then MODIS snow-covered days are produced by this new snow cover products through two standards.Through comparison of these two different snow-covered days all over China,it is found that among the three major snow cover centers,snow cover is more stable in Xinjiang Region than that in the other two regions,including the Tibetan Plateau and Northeast China-Inner Mongolia Region.The MODIS snow cover days are validated and calibrated by using 595 in-situ observations of snow cover days all over China after 2001.The outcome indicates that the unstable and stable snow-covered areas reach to 490.6 104 km2 and 334.4×104 km2,respectively.The stable snow-covered area in the Tibetan Plateau,Xinjiang Region and Northeast China-Inner Mongolia Region is about 153.7×104 km2,56.8×104 km2 and 117.9×104 km2,respectively.