Journal of Atmospheric and Environmental Optics, Volume. 18, Issue 4, 323(2023)
Spatial distribution of fine-mode aerosol optical depth over land in spring 2022 based on DPC/GF-5(02)
Atmospheric fine-mode aerosols, which are mostly originated from anthropogenic emissions, can reflect human activity's impacts on the atmosphere. Therefore, the fine-mode aerosol optical depth (AODf) is one of the basic parameters in the filed of atmospheric environment. Based on the remote sensing data of Directional Polarimetric Camera (DPC) onboard Gaofen-5(02) satellite, the AODf data over global land of spring 2022 (from March to May) were obtained using the look-up table retrieval method in this study, and then the AODf inversion results were verified using the ground-based observation of AERONET sites. Based on the analysis of AODf distribution, it is found that the distribution of global AODf shows an obvious north-south difference, with low values in the southern hemisphere and high values in the northern hemisphere mainly concentrated in the Asian region. In China, AODf distribution shows considerable differences between the two sides of the "Hu-Huanyong Line". On the south-east side, the high AODf values is mainly concentrated in the Sichuan-Chongqing region, North China Plain and the Guangdong-Guangxi region, while on the north-west side, AODf is generally low over Qinghai-Tibet Plateau and desert area. This kind of spatial distribution pattern of AODf reflects the influence from both anthropogenic factors and natural factors. As for South Asia and Central-North Africa, it is shown that AODf distribution is correlated with smoke and soot emissions from local burning combustion, and meteorological factors such as monsoon. In addition, the AODf retrieval data from DPC were compared with MODIS fine-mode aerosol products, and it is found that the spatial distribution of high AODf from the two datasets is basically consistent, while DPC data have a better coverage for bright surface than MODIS data, which makes it more suitable for providing data support for global and regional monitoring of atmospheric environment.
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Jiantao DONG, Zhengqiang LI, Yisong XIE, Cheng FAN, Jin HONG, Liuxin DAI, Haoran GU, Yang ZHENG. Spatial distribution of fine-mode aerosol optical depth over land in spring 2022 based on DPC/GF-5(02)[J]. Journal of Atmospheric and Environmental Optics, 2023, 18(4): 323
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Received: Feb. 20, 2023
Accepted: --
Published Online: Aug. 24, 2023
The Author Email: XIE Yisong (xieys@radi.ac.cn)