Validation of a Physical Retrieval Scheme of Solar Surface Irradiances from Narrowband Satellite Radiances
Validation of a Physical Retrieval Scheme of Solar Surface Irradiances from Narrowband Satellite Radiances
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DOI：
10.1175/jam2290.1
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发表时间：
2005-09
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影响因子：
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通讯作者：
H. Deneke;A. Feijt;A. Lammeren;C. Simmer
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文献类型：
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作者：
H. Deneke;A. Feijt;A. Lammeren;C. Simmer
本文提出了一种由卫星测量的0.63 μm反射率反演下沉太阳表面辐照度的算法，该算法能明确地解释云光学厚度和积分水汽的变化。为了验证，40 356日射强度计测量和1450 NOAA-14高级甚高分辨率辐射计（AVHRR）卫星场景的荷兰的长期数据集。卫星检索的辐照度平均高估7%，这是与许多其他研究报告的大气透射率的正偏差，计算辐射传输方案与测量结果相比，是一致的。这种偏差可以用AVHRR和总日射表的校准和测量不确定性来解释。一个强大的太阳天顶角依赖性的偏差时，发现水云假设在检索。在冰云中没有观察到这种依赖性。目前，还没有足够的信息来解释...
Abstract An algorithm is presented to derive the downwelling solar surface irradiance from satellite measurements of the 0.63-μm reflectance, which explicitly accounts for variations in cloud optical depth and integrated water vapor. For validation, a long-term dataset of 40 356 pyranometer measurements and 1450 NOAA-14 Advanced Very High Resolution Radiometer (AVHRR) satellite scenes of the Netherlands is used. A mean overestimate of the satellite-retrieved irradiance by 7% is found, which is consistent with numerous other studies reporting positive biases of atmospheric transmissivities that are calculated by radiative transfer schemes in comparison with measurements. The bias can be explained by the calibration and measurement uncertainties of both the AVHRR and pyranometer. A strong solar zenith angle dependence of the bias is found when water clouds are assumed in the retrieval. Such a dependence is not observed for ice clouds. Currently, there is not enough information for a conclusive explanation o...