FY-3A/MERSI气溶胶光学厚度资料在北京及其周围地区的精度评价

Accuracy Evaluation of FY-3A/MERSI Aerosol Optical Depth Data in Beijing and Its Adjacent Region

采用波长插值和时空匹配的方法,对气溶胶自动观测网(aerosol robotic network,AERONET)和风云三号卫星中分辨率光谱成像仪(FY-3A/MERSI)气溶胶光学厚度(aerosol optical depth,AOD)产品进行匹配,并进一步使用AERONET AOD数据对北京以及周围地区的FY-3A/MERSI AOD产品精度进行验证分析。实验结果表明:(1)FY-3A AOD与AERONET AOD具有较高的相关性(R=0.733),总体偏低于AERONET AOD(bias=-0.012);(2)下垫面植被覆盖度越高,FY-3A AOD反演精度越高;气溶胶浓度较低精度越高,反之反演精度越低;并且在春冬季节的反演精度高于夏秋季节。此结论可为北方地区的FY-3A/MERSI气溶胶产品使用提供参考。

Automatic aerosol observation network（AERONET） and FY-3 A Moderate Resolution Imaging Spectrometer（FY-3 A/MERSI） are matched by utilizing the method of band interpolation and temporal-spatial matching. The inversion precision of FY-3 A/MERSI AOD products in Beijing, China and adjacent regions is verified and analyzed by using AERONET AOD data. The results show：（1） FY-3 A AOD data presents a high relativity（R=0.733） with AERONET AOD data and generally less than it（bias=-0.012）.（2） The higher the underlying surface vegetation coverage is, the higher the FY-3 A AOD data retrieving accuracy is,and the accuracy in winter-spring season is higher than that in summer-autumn season. Also, the retrieval precision is greater in low aerosol concentration condition. The above conclusions can provide reference for the application of FY-3 A/MERSI aerosol products in northern China.