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冰川冻土  2013 

基于MODIS数据的石羊河流域地表温度空间格局

DOI: 10.7522/j.issn.1000-0240.2013.0007, PP. 57-64

Keywords: 小流域热环境,地表温度反演,分裂窗口算法,MODIS,石羊河流域

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Abstract:

利用2010年4期MODIS影像,基于植被指数、地表比辐射率、大气透过率和星上亮度温度,采用分裂窗口算法,反演石羊河流域不同季节地表温度并对其进行验证.结果表明石羊河流域四季地表温度变化明显,昼夜温差很大,其中,春季温度分布在-13.45~29.27℃之间;夏季温度分布在-3.75~56.29℃之间;秋季温度分布在-10.15~32.67℃之间;冬季温度分布在-17.15~12.75℃之间.从地表温度空间分布上看,在武威、民勤、古浪等绿洲地区地表热量丰富,水土和植被效应显著,热量呈圈状空间递减趋势;在下游地区腾格里沙漠和巴丹吉林沙漠地区夏季温度最高,祁连山东端的石羊河上游地区由于受常年积雪、河流、地表植被和海拔等因素影响地表温度较低.MODIS数据为宏观小流域热环境监测提供了新的途径,且将遥感数据和地表下垫面数据相结合能提高反演精度.

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