Your browser doesn't support javascript.
Improved Anthropogenic SO2 Retrieval from High-Spatial-Resolution Satellite and its Application during the COVID-19 Pandemic.
Xia, Congzi; Liu, Cheng; Cai, Zhaonan; Duan, Xiaonan; Hu, Qihou; Zhao, Fei; Liu, Haoran; Ji, Xiangguang; Zhang, Chengxin; Liu, Yi.
  • Xia C; School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China.
  • Liu C; Key Lab of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
  • Cai Z; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
  • Duan X; School of Engineering Science, University of Science and Technology of China, Hefei 230026, China.
  • Hu Q; Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230026, China.
  • Zhao F; Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029, China.
  • Liu H; Bureau of Frontier Sciences and Education, Chinese Academy of Sciences, Beijing 100864, China.
  • Ji X; Key Lab of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
  • Zhang C; School of Engineering Science, University of Science and Technology of China, Hefei 230026, China.
  • Liu Y; Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China.
Environ Sci Technol ; 55(17): 11538-11548, 2021 09 07.
Article in English | MEDLINE | ID: covidwho-1397825
ABSTRACT
Sulfur dioxide (SO2) measured by satellites is widely used to estimate anthropogenic emissions. The Sentinel-5 Precursor (S-5P) operational SO2 product is overestimated compared to the ground-based multiaxis differential optical absorption spectroscopy (MAX-DOAS) measurements in China and shows an opposite variation to the surface measurements, which limits the application of TROPOspheric monitoring instrument (TROPOMI) products in emissions research. Radiometric calibration, a priori profiles, and fitting windows might cause the overestimation of S-5P operational SO2 product. Here, we improve the optimal-estimation-based algorithm through several calibration methods. The improved retrieval agrees reasonably well with the ground-based measurements (R > 0.70, bias <13.7%) and has smaller biases (-28.9%) with surface measurements over China and India. It revealed that the SO2 column in March 2020 decreased by 51.6% compared to March 2019 due to the lockdown for curbing the spread of the COVID-19 pandemic, and there was a decrease of 50% during the lockdown than those after the lockdown, similar to the surface measurement trend, while S-5P operational SO2 product showed an unrealistic increase of 19%. In India, the improved retrieval identified obvious "hot spots" and observed a 30% decrease of SO2 columns during the lockdown.
Subject(s)
Keywords

Full text: Available Collection: International databases Database: MEDLINE Main subject: Air Pollutants / Air Pollution / COVID-19 Limits: Humans Language: English Journal: Environ Sci Technol Year: 2021 Document Type: Article Affiliation country: Acs.est.1c01970

Similar

MEDLINE

...
LILACS

LIS


Full text: Available Collection: International databases Database: MEDLINE Main subject: Air Pollutants / Air Pollution / COVID-19 Limits: Humans Language: English Journal: Environ Sci Technol Year: 2021 Document Type: Article Affiliation country: Acs.est.1c01970