中国地区近10年地表反照率变化趋势

Trend of Surface Albedo Changes in China in Last Decade

利用EOS-MODIS卫星的地表反照率数据(MCD43C3的L3等级)和一元线性回归法分析了2000年3月至2009年2月中国区域地表反照率的分布特征及年际、季节变化趋势。结果表明:中国区域地表反照率分布西高东低,随海拔和纬度分布;中国大部分地区近10年的年平均地表反照率有增长趋势,东南部的增长范围最广,高海拔和高纬度地区以增长为主;河套地区以及松辽平原的地表反照率减小最快。四季变化中,冬季有明显变化趋势的范围最广;中国地区东南部四季都有明显的增长趋势(0.0005/年～0.001/年),河套地区除冬季外都有明显的减小趋势;秋冬两季,青藏高原有明显变化趋势的范围最广,高原西部腹地有减小趋势,四周山脉冰川有增长趋势。

EOS-MODIS satellite data on surface albedo（MCD43C3 on Level3） are used to analyze the regional distribution of surface albedo features in China,as well as the inter-annual and quarterly trends from March 2000 to February 2009.The results show that the regional surface albedo in China was high in the west and low in the east,and varied with altitude and latitude;for nearly 10 years in most areas of China,the annual mean surface albedo had an increase trend,with the southeastern China being most extensive and high-altitude and high latitude regions being growth-oriented;in the Hetao region and Songliao Plain,the surface albedo decreased most quickly.As for seasonal change,there was the most extensive area with variation trends in winter.There were sharply increase trends（0.0005 to 0.001 per year） in the southeastern China in four seasons,and significantly decreasing trends in Hetao,except in winter.In autumn and winter,there was the extensive area with significant variation trends in the Tibetan Plateau,decreasing in the western hinterland of the plateau and increasing around the mountain glaciers.