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利用HJ-1B热红外数据估算晴天大气下行长波辐射

, PP. 256-270

Keywords: 参数化模型,波段亮温,MODIS水汽,地气温差校正

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Abstract:

?针对HJ-1B红外相机只有一个热红外通道的特点,本文利用大气辐射传输模型模拟和统计回归方法,发展了一个利用HJ-1B辐射亮温和大气水汽含量反演高分辨率大气下行长波辐射的参数化模型.为了分析模型的适宜性和误差来源,利用模拟数据对模型进行了精度评价,结果表明模型在大多数气候条件下反演结果较好,但在大气水汽含量较高时存在低估现象.误差分析表明,大气水汽含量、传感器辐射亮度、地表与大气的温差等方面的不确定性会对反演结果产生一定的影响.利用2009~2010年HJ-1B数据反演得到黑河流域和海河流域的瞬时下行长波辐射,并利用6个站点的地面观测数据对反演结果进行了验证.结果表明,除花寨子荒漠站外,其他各站点反演值与实测值的一致性较好,均方根误差在20W/m2左右,略好于MODIS数据的反演结果.花寨子站夏季时存在较多的高估现象,主要由地气温差过大引起,经过地气温差校正后,结果得到明显改善.

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