气候变化领域集成服务门户(CCPortal): Evaluation and possible uncertainty source analysis of JAXA Himawari-8 aerosol optical depth product over China

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DOI	10.1016/j.atmosres.2020.105248
	Evaluation and possible uncertainty source analysis of JAXA Himawari-8 aerosol optical depth product over China
	Gao L.; Chen L.; Li C.; Li J.; Che H.; Zhang Y.
发表日期	2021
ISSN	0169-8095
卷号	248
英文摘要	The latest version of JAXA aerosol optical depth (AOD) product over China in 2018 from Himawari-8 Advanced Himawari Imager (AHI) was evaluated, including validation with global AErosol RObotic NETwork (AERONET) and China Aerosol Research Network (CARSNET) ground-based observations, and comparison against the Moderate Resolution Imaging Spectroradiometer (MODIS) AOD product. Considering both the quality and quantity of the AHI AOD product, the Quality Assurance Flags (QA_Flags) with “good” and “very good” are chosen for evaluation and analysis. AHI and MODIS AOD products are well correlated and the spatial distributions are similar, even though underestimation from AHI AOD in the morning and overestimation in the afternoon are found when compared with MODIS AOD. Validation with ground-based observations also indicates a good correlation (R > 0.75) when sparsely vegetated surfaces are excluded. It is found that 52.74% fall below the expected error (EE) at 10:30 BJT when compared with CARSNET which has more vegetation sites and 56.91% fall above the EE at 13:30 BJT when compared with AERONET which has more urban sites. The slope of the fit line is around 1.0 for all matched sites, while the scatter plots have divided into two parts as the performance of AHI AOD depends on the observation times and surface types. The temporal variations of AHI and AERONET AODs show that the overestimation from AHI AOD occurs in the afternoon for barren surface while the underestimation occurs in the morning for well-vegetation surface. For monthly variation, the overestimation of AHI AOD is found over Northern China in winter and those seasons when the plants are growing or disappearing rapidly. The assumption that the surface reflectance remains unchanged and the solar geometries are nearly identical within a month causes the underestimation of surface reflectance and thus contributes to the AHI AOD overestimation for low vegetation and bare surfaces in autumn and winter. While over the vegetated surfaces, neglecting the background aerosols causes overestimation of the surface reflectance, and thus leads to underestimation of AHI AOD. The difference between backward and forward scattering contributes to the larger JAXA AHI AOD error in the afternoon, which aggravates positive deviation for barren land sites and alleviates the underestimation for vegetation surface types in the afternoon. In addition, aerosol model selection and cloud contamination also affect the accuracy of aerosol products, especially when AOD is large. Overall, the JAXA AHI AOD provides a high temporal resolution and relative reliable aerosol product for environmental research. The analysis on characteristics and uncertainty sources in this study are to further enhance the understanding of the geostationary satellite aerosol products for applications, and provide useful information for improving the aerosol retrieval algorithm in future. © 2020 The Authors
英文关键词	Aerosol Optical Depth; Evaluation; Himawari-8; Sun photometer measurements; Uncertainty source analysis
语种	英语
scopus关键词	Aerosols; Forward scattering; Geostationary satellites; Optical properties; Quality assurance; Radiometers; Reflection; Temperature measurement; Uncertainty analysis; Urban growth; Vegetation; Aerosol optical depths; Aerosol retrieval algorithms; Environmental researches; Evaluation and analysis; Ground-based observations; High temporal resolution; Moderate resolution imaging spectroradiometer; Uncertainty sources; Quality control; AERONET; aerosol property; geostationary satellite; MODIS; optical depth; photometer; source apportionment; uncertainty analysis; China
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141686
作者单位	National Satellite Meteorological Center, China Meteorological Administration, Beijing, 100081, China; Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China; Cooperative Institute for Meteorological Satellite Studies, University of Wisconsin–Madison, Madison, WI 53706, United States; Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, 100081, China
推荐引用方式 GB/T 7714	Gao L.,Chen L.,Li C.,et al. Evaluation and possible uncertainty source analysis of JAXA Himawari-8 aerosol optical depth product over China[J],2021,248.
APA	Gao L.,Chen L.,Li C.,Li J.,Che H.,&Zhang Y..(2021).Evaluation and possible uncertainty source analysis of JAXA Himawari-8 aerosol optical depth product over China.Atmospheric Research,248.
MLA	Gao L.,et al."Evaluation and possible uncertainty source analysis of JAXA Himawari-8 aerosol optical depth product over China".Atmospheric Research 248(2021).