| 锡林郭勒草原地表反照率对气候变化的响应 |
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| 引用本文： | 张学珍.锡林郭勒草原地表反照率对气候变化的响应[J].地理研究,2012,31(2):299-310. |
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| 作者姓名： | 张学珍 |
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| 作者单位： | 中国科学院地理科学与资源研究所, 北京 100101 |
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| 基金项目： | 全球变化研究国家重大科学研究计划(2010CB951801、2010CB950903);国家自然科学基金项目(41001122、41030101) |
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| 摘 要： | 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。
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| 关 键 词： | 典型草原 地表反照率 气候变化 MODIS产品 |
| 收稿时间： | 2011-04-13 |
| 修稿时间： | 2011-09-25 |
The responses of surface albedo to climatic changes in Xilin Gol grassland |
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| ZHANG Xue-zhen.The responses of surface albedo to climatic changes in Xilin Gol grassland[J].Geographical Research,2012,31(2):299-310. |
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| Authors: | ZHANG Xue-zhen |
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| Institution: | Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China |
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| Abstract: | This study assessed the reliability of Moderate Resolution Imaging Spectroradiometer(MODIS)-derived land surface albedo products for Xilin Gol grassland,illustrated the seasonal cycles and inter-annual variations of land surface albedo in Xilin Gol grassland,and analyzed correlations between surface albedo variations and climatic changes.The results show MODIS-derived dataset is able to capture seasonal cycle and inter-annual variations of surface albedo,though there is a difference between the MODIS-derived albedo and ground instrumental measurements.The MODIS-derived dataset illustrates that the seasonal cycle patterns of surface albedo vary with spectrum.For the visible band surface albedo,the seasonal cycle presents a "V"-shaped variation with the bottom in the first ten days of August.For the near-infrared band surface albedo,the seasonal cycle is "U"-shaped with the bottom in the period from June to September.However,both visible band surface albedo and near-infrared band surface albedo had consistent inter-annual variations.Moreover,the inter-annual variations of surface albedo were partly attributed to climatic variations.The effects of temperature were significant in the early(April to May) and late(September to November) growth season.The correlation coefficients between temperature and surface albedo were-0.67 and 0.63 in the early and late growth season,respectively.The effects of precipitation were significant through out the growth season.The correlation coefficients between precipitation and surface albedo ranged from-0.54 to-0.76.It is worthy noting that the effects of precipitation were usually lagged by 2-3 months. |
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| Keywords: | grassland surface albedo climate change MODIS products |
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