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首页> 外文期刊>Atmospheric Measurement Techniques Discussions >Validation of MODIS 3?km land aerosol optical depth from NASA's EOS Terra and Aqua missions
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Validation of MODIS 3?km land aerosol optical depth from NASA's EOS Terra and Aqua missions

机译：通过NASA的EOS Terra和Aqua任务验证MODIS 3公里的陆地气溶胶光学深度

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In addition to the standard resolution product (10?km), the MODerate resolution Imaging Spectroradiometer (MODIS) Collection 6 (C006) data release included a higher resolution (3?km). Other than accommodations for the two different resolutions, the 10 and 3?km Dark Target (DT) algorithms are basically the same. In this study, we perform global validation of the higher-resolution aerosol optical depth (AOD) over global land by comparing against AErosol RObotic NETwork (AERONET) measurements. The MODIS–AERONET collocated data sets consist of 161?410 high-confidence AOD pairs from 2000 to 2015 for Terra MODIS and 2003 to 2015 for Aqua MODIS. We find that 62.5 and 68.4?% of AODs retrieved from Terra MODIS and Aqua MODIS, respectively, fall within previously published expected error bounds of ± (0.05 + 0.2 × AOD), with a high correlation ( R= 0.87). The scatter is not random, but exhibits a mean positive bias of ～ 0.06 for Terra and ～ 0.03 for Aqua. These biases for the 3?km product are approximately 0.03 larger than the biases found in similar validations of the 10?km product. The validation results for the 3?km product did not have a relationship to aerosol loading (i.e., true AOD), but did exhibit dependence on quality flags, region, viewing geometry, and aerosol spatial variability. Time series of global MODIS–AERONET differences show that validation is not static, but has changed over the course of both sensors' lifetimes, with Terra MODIS showing more change over time. The likely cause of the change of validation over time is sensor degradation, but changes in the distribution of AERONET stations and differences in the global aerosol system itself could be contributing to the temporal variability of validation.
机译：除了标准分辨率产品（10？km），MODerate分辨率成像光谱仪（MODIS）集合6（C006）数据发布还包括更高的分辨率（3？km）。除了适应两种不同的分辨率外，10和3？km的暗目标（DT）算法基本相同。在这项研究中，我们通过与AErosol机器人网络（AERONET）测量值进行比较，对全球陆地上更高分辨率的气溶胶光学深度（AOD）进行了全球验证。 MODIS–AERONET并置数据集由Terra MODIS的2000年到2015年以及Aqua Aqua的2003年到2015年的161？410个高置信度AOD对组成。我们发现，分别从Terra MODIS和Aqua MODIS检索到的AOD的62.5％和68.4％属于先前发布的预期误差范围±（0.05 + 0.2×AOD），具有高度相关性（R = 0.87）。散布不是随机的，但对Terra表现出约0.06的平均正偏差，对于Aqua表现出约0.03的平均正偏差。 3平方公里乘积的这些偏差大约比10平方公里乘积的类似验证中发现的偏差大0.03。 3平方公里产品的验证结果与气溶胶负荷（即真实的AOD）没有关系，但确实表现出对质量标志，区域，观察几何形状和气溶胶空间变异性的依赖性。全球MODIS-AERONET差异的时间序列表明，验证不是静态的，而是在两个传感器的寿命周期内都发生了变化，Terra MODIS显示了随时间的变化。验证随时间变化的可能原因是传感器性能下降，但是AERONET站点分布的变化以及全球气溶胶系统本身的差异可能会导致验证的时间变化。

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