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Open AccessArticle

Himawari-8/AHI and MODIS Aerosol Optical Depths in China: Evaluation and Comparison

1
Department of Earth System Science, Tsinghua University, Beijing 100084, China
2
Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(9), 1011; https://doi.org/10.3390/rs11091011
Received: 1 March 2019 / Revised: 20 April 2019 / Accepted: 25 April 2019 / Published: 28 April 2019
(This article belongs to the Section Atmosphere Remote Sensing)
The geostationary earth orbit satellite—Himawari-8 loaded with the Advanced Himawari Imager (AHI) has greatly enhanced our capacity of dynamic monitoring in Asia–Pacific area. The Himawari-8/AHI hourly aerosol product is a promising complementary source to the MODerate resolution Imaging Spectroradiometer (MODIS) daily aerosol product for near real-time air pollution observations. However, a comprehensive evaluation of AHI aerosol optical depth (AOD) is still limited, and the difference in performances of AHI and MODIS remains uncertain. In this study, we evaluated the Himawari-8/AHI Level 3 Version 3.0 and MODIS Collection 6.1 Deep Blue AOD products over China against AOD measurements from AErosol RObotic NETwork (AERONET) sites in a spatiotemporal comparison of the products from February 2018 to January 2019. Results showed that AHI AOD achieved a moderate agreement with AERONET with a correlation coefficient of 0.75 and a root-mean-square-error of 0.26, which was slightly inferior to MODIS. The retrieval accuracy was spatially and temporally varied in AHI AOD, with higher accuracies for XiangHe and Lulin sites as well as in the morning and during the summer. The dependency analysis further revealed that the bias in AHI AOD was strongly dependent on aerosol loading and influenced by the Ångström Exponent and NDVI while those for MODIS appeared to be independent of all variables. Fortunately, the biases in AHI AOD could be rectified using a random forest model that contained the appropriate variables to produce sufficiently accurate results with cross-validation R of 0.92 and RMSE of 0.15. With these adjustments, AHI AOD will continue to have great potential in characterizing precise dynamic aerosol variations and air quality at a fine temporal resolution. View Full-Text
Keywords: aerosol optical depth (AOD); Himawari-8; MODIS; validation; China aerosol optical depth (AOD); Himawari-8; MODIS; validation; China
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MDPI and ACS Style

Jiang, T.; Chen, B.; Chan, K.K.Y.; Xu, B. Himawari-8/AHI and MODIS Aerosol Optical Depths in China: Evaluation and Comparison. Remote Sens. 2019, 11, 1011. https://doi.org/10.3390/rs11091011

AMA Style

Jiang T, Chen B, Chan KKY, Xu B. Himawari-8/AHI and MODIS Aerosol Optical Depths in China: Evaluation and Comparison. Remote Sensing. 2019; 11(9):1011. https://doi.org/10.3390/rs11091011

Chicago/Turabian Style

Jiang, Tingting; Chen, Bin; Chan, Karen K.Y.; Xu, Bing. 2019. "Himawari-8/AHI and MODIS Aerosol Optical Depths in China: Evaluation and Comparison" Remote Sens. 11, no. 9: 1011. https://doi.org/10.3390/rs11091011

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