Estimation of Hourly Ground-Level PM?.? Concentration Based on Himawari-8 Apparent Reflectance

Wenzhi Fan; Kai Qin; Yilong CuiDing LiMuhammad Bilal

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Estimation of Hourly Ground-Level PM?.? Concentration Based on Himawari-8 Apparent Reflectance

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Satellite aerosol optical depth (AOD) is a quantitative parameter frequently used to estimate ground-level fine particulate matters (PMamp;subamp;2.5amp;/subamp;)at regional to global scales. In this article, Himawari-8 apparent reflectance (top-of-atmosphere reflectance) data were used to estimate the hourly ground-level PMamp;subamp;2.5amp;/subamp; concentrations (Ref-PMamp;subamp;2.5amp;/subamp;) using deep neural networks (DNNs), and comparison was conducted with the AOD-based PMamp;subamp;2.5amp;/subamp; estimation method (AOD-PMamp;subamp;2.5amp;/subamp;). In high-density site areas, the Ref-PMamp;subamp;2.5amp;/subamp; method was closer to the actual situation and more capable of PMamp;subamp;2.5amp;/subamp; estimation compared with the AOD-PMamp;subamp;2.5amp;/subamp; method. The PMamp;subamp;2.5amp;/subamp; samples used in the AOD-PMamp;subamp;2.5amp;/subamp; method were less than one-half of the Ref-PMamp;subamp;2.5amp;/subamp; method due to unavailability of AOD observations, which might be due to strict surface assumptions, cloud detection, and error in the aerosol scheme used in the AOD inversion method. This led to many missing values of AOD-derived PMamp;subamp;2.5amp;/subamp; in the spatial distribution map of a single day. Moreover, similar hourly variations in PMamp;subamp;2.5amp;/subamp; were observed for both the methods, and the highest concentration of PMamp;subamp;2.5amp;/subamp; appeared at the junction of Jiangsu, Anhui, and Shandong at 08:00, 09:00, and 10:00 in local time, which gradually decreased at 11:00 and reached to a minimum value at 16:00 and 18:00.

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《IEEE Transactions on Geoscience and Remote Sensing》 |2021年第1期|76-85|共10页
作者
Wenzhi Fan; Kai Qin; Yilong CuiDing LiMuhammad Bilal;
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作者单位

School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China;

School of Environment Science and Spatial Informatics and Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou, China;

School of Computer Science and Engineering, University of Electrical Science and Technology of China, Chengdu, ChinaSchool of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China;

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正文语种英语
中图分类地球物理学;遥感技术;
关键词
Aerosols; Atmospheric modeling; Estimation; Satellites; Spatial resolution; Monitoring; MODIS; Aerosol optical depth (AOD); apparent reflectance; deep neural network (DNN); Himawari-8; particulate matter (PM?.?);

Estimation of Hourly Ground-Level PM?.? Concentration Based on Himawari-8 Apparent Reflectance

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