Evaluating Aerosol Optical Depth From Himawari‐8 With Sun Photometer Network
Evaluating Aerosol Optical Depth From Himawari‐8 With Sun Photometer Network
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DOI：
10.1029/2018jd028599
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发表时间：
2019-05
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通讯作者：
Wei Wang;Feiyue Mao;Zengxin Pan;W. Gong;Mayumi Yoshida;Bin Zou;Huiyun Ma
中科院分区：
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作者：
Wei Wang;Feiyue Mao;Zengxin Pan;W. Gong;Mayumi Yoshida;Bin Zou;Huiyun Ma
先进的Himawari成像仪（AHI）是日本Himawari-8地球同步卫星上的主要传感器，以高时空分辨率测量区域气溶胶观测。为了提高产品质量和科学应用，我们对AHI气雾剂产品进行了全面评价（1.0版）。我们比较了近2年（2015年7月15日至2017年6月31日）AHI气溶胶光学厚度（AOD 500）与气溶胶机器人网络（AERONET）和海上气溶胶网络（MAN）的AOD。结果表明，在陆地上，AHI反演显示出-0.062的大的总体偏差，R为0.78;在海洋上，平均偏差为0.036（MAN为0.051），R为0.89（MAN为0.95）。AHI反演与AERONET AOD（τA）搭配显示了以下预期的AHI AOD误差：陆地（−0.66 × τA + 0.02，−0.34 × τA + 0.16）和海洋（−0.24 × τA + 0.03，0.10 × τA + 0.11）。AHI检索的性能下降与不同区域、角度、气溶胶类型和地表类型相关，这表明可以通过改变气溶胶光学模型、使用更好的云过滤器以及结合多种方法来估计地面反射率来改进AHI气溶胶算法。AHI-中等分辨率成像光谱仪-AERONET的同位比较表明，在陆地上，当排除具有大观察天顶角和小散射角的反演时，AHI日间AOD明显改善。
The Advanced Himawari Imager (AHI), the primary sensor aboard the Japanese Himawari‐8 geostationary satellite, measures regional aerosol observations with high temporal‐spatial resolution. To improve product quality and scientific applications, we performed a comprehensive evaluation of AHI aerosol products (version 1.0). We compared nearly 2 years (15 July 2015 to 31 June 2017) of AHI aerosol optical depth at 500 nm (AOD500) with AODs from the Aerosol Robotic Network (AERONET) and the Maritime Aerosol Network (MAN). Results showed that, over land, AHI retrievals exhibit a large overall bias of −0.062, with an R of 0.78; over ocean, average bias measured 0.036 (0.051 for MAN), with an R of 0.89 (0.95 for MAN). AHI retrievals collocated with AERONET AODs (τA) showed the following expected AHI AOD errors: (−0.66 × τA + 0.02, −0.34 × τA + 0.16) over land and (−0.24 × τA + 0.03, 0.10 × τA + 0.11) over ocean. AHI retrievals with degraded performance correlated to different regions, angles, aerosol types, and surface types, suggesting that the AHI aerosol algorithm can be improved by changing aerosol optical models, using better cloud filters, and combining multiple methods to estimate ground reflectance. Collocated comparisons of AHI‐MODerate‐resolution Imaging Spectroradiometer‐AERONET demonstrate that, over land, AHI daytime AODs clearly improve when retrievals with a large viewing zenith angle and small scattering angle are excluded.