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基于岸基实测数据的FY-3A近红外通道海洋大气水汽反演

Keywords: 近红外,大气水汽含量,中分辨率成像光谱仪(MERSI),通道比值法

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Abstract:

即利用全自动太阳光度计(CE-318)野外定点长时间序列现场观测数据,验证传统大气水汽反演算法,结果表明,反演结果精度较低,不适于该研究区域大气水汽含量反演。因而,给出了近红外波段大气水汽含量探测的原理,对自主卫星FY-3A中分辨率成像光谱仪MERSI(MediumResolutionSpectralImager)反演大气水汽含量算法作了推导、分析。基于长时间序列现场观测数据集,建立了局地化的FY-3A海洋大气水汽反演算法,并用于研究区实际大气水汽含量反演.通过双通道比值法和三通道比值法反演结果与现场实测CE-318数据比较,得出以下结论:模型受下垫面反射率影响较大;三通道比值法较双通道比值法反演结果精度更高,双通道比值法误差为16.1%,三通道比值法误差为14.3%;实测数据验证和改进后算法精度更高。

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