北京地区改进SYNTAM算法反演AOT有效性验证

Primary validation of improved SYNTAM aerosol retrieval model in Beijing region using AERONET data

本文利用了改进的SYNTAM算法反演了北京地区气溶胶光学厚度,并利用AERONET站点观测值进行验证比对分析:(1)基于设定的卷积窗口统计计算反演的相应气溶胶光学厚度参量值;(2)利用匹配对应时间尺度范围的AERONET站点值进行相关性分析,合理评估双星协同反演算法的有效性。结果表明:在北京地区该算法具有良好的适用性和可用性,反演所得大气气溶胶光学厚度与地面监测值具有高度的一致性,其对该区大气质量环境监测和农业生产光照胁迫性分析具有很好的实用价值。

In this paper,a synergy of the moderate resolution imaging Spectroradiometer(MODIS) onboard Terra and Aqua satellites(SYNTAM) algorithm was improved to retrieve the atmospheric aerosol optical thickness(AOT) in Beijing region,and its results were compared with the Aerosol Robotic Network(AERONET) observations as ground truth in order to be validated.Firstly,a series of statistical values were obtained based on the corresponding AOT values from retrieval,in accordance with a convolution scheme with a pre-defined fixed window size.Secondly,the results of the AERONET observations associated with both spatially and temporally were contrastively analyzed to find the relevant correlations between the fore and the latter,and the effectiveness of the SYNTAM algorithm was properly assessed.The results show that the improved algorithm is greatly applicable and available in Beijing region because the AOT values,retrieved by it,are very highly consistent with the real values on related ground sites,and is quite significant with respect to air environmental monitoring and effect analysis of sun-light stress for crop growing.