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在对锡林郭勒草原地区MODIS的地表反照率产品(MCD43C3)的可靠性进行评估的基础上,利用该产品分析了2002～2009年锡林郭勒草原地表反照率的变化及其与温度和降水的关系。结果表明:(1)MODIS的反演结果能够很好地反映地表反照率的季节变化和年际变化特征;(2)锡林郭勒草原可见光波段反照率的季节变化呈V字形,低谷出现在8月上旬,近红外波段的则呈U字形,低值时段为6～9月;(3)可见光和近红外波段反照率的年际变化特征基本一致,其与温度和降水的年际波动有显著相关关系,其中,温度与地表反照率仅在生长季初期和末期显著相关,分别是负相关(相关系数为-0.67)和正相关(0.63),降水量与地表反照率在整个生长季都显著负相关(-0.54～-0.76),并且其影响效果有2～3个月的滞后期。
On the basis of evaluating the reliability of MODIS surface albedo product (MCD43C3) in Xilin Gol prairie region, this paper analyzed the change of surface albedo of Xilin Gol Grassland from 2002 to 2009 and its relationship with temperature and precipitation. The results show that: (1) The inversion results of MODIS can well reflect the seasonal variation and interannual variation of surface albedo; (2) The seasonal variation of Albedo in the visible band of Xilingol Grassland is V-shaped and the trough appears in early August , While the near infrared band was U-shaped with the low value period being from June to September; (3) The annual variation of albedo in the visible and near infrared bands was basically the same, which was significantly correlated with the interannual fluctuation of temperature and precipitation , Of which temperature and surface albedo were significantly correlated only during the early and late growing seasons, with negative correlation (-0.67) and positive correlation (0.63) respectively. Precipitation and surface albedo were negatively correlated throughout the growing season -0.54 ~ -0.76), and its effect has a lag of 2-3 months.