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An improved TROPOMI tropospheric HCHO retrieval over China

Su, W. and Liu, C. and Chan, Ka Lok and Hu, Q. and Liu, H. and Ji, X. and Zhu, Y. and Liu, T. and Zhang, Chengxin and Chen, Y. and Liu, J. (2020) An improved TROPOMI tropospheric HCHO retrieval over China. Atmospheric Measurement Techniques (AMT), 13 (11), pp. 6271-6292. Copernicus Publications. doi: 10.5194/amt-13-6271-2020. ISSN 1867-1381.

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Official URL: https://amt.copernicus.org/articles/13/6271/2020/

Abstract

We present an improved TROPOspheric Monitoring Instrument (TROPOMI) retrieval of formaldehyde (HCHO) over China. The new retrieval optimizes the slant column density (SCD) retrieval and air mass factor (AMF) calculation for TROPOMI observations of HCHO over China. Retrieval of HCHO differential SCDs (DSCDs) is improved using the basic optical differential spectroscopy (BOAS) technique resulting in lower noise and smaller random error, while AMFs are improved with a priori HCHO profiles from a higher resolution regional chemistry transport model. Compared to the operational product, the new TROPOMI HCHO retrieval shows better agreement with ground-based Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements in Beijing. The improvements are mainly related to the AMF calculation with more precise a priori profiles in winter. Using more precise a priori profiles in general reduces HCHO vertical column densities (VCDs) by 52.37 % (± 27.09 %) in winter. Considering the aerosol effect in AMF calculation reduces the operational product by 11.46 % (± 1.48 %) and our retrieval by 17.61 % (± 1.92 %) in winter. The improved and operational HCHO are also used to investigate the spatial–temporal characteristics of HCHO over China. The result shows that both improved and operational HCHO VCDs reach maximum in summer and minimum in winter. High HCHO VCDs mainly located over populated areas, i.e., Sichuan Basin and central and eastern China, indicate a significant contribution of anthropogenic emissions. The hotspots are more obvious on the map of the improved HCHO retrieval than the operational product. The result indicates that the improved TROPOMI HCHO retrieval is more suitable for the analysis of regional- and city-scale pollution in China.

Item URL in elib:https://elib.dlr.de/139682/
Document Type:Article
Title:An improved TROPOMI tropospheric HCHO retrieval over China
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Su, W.University of Science and Technology of ChinaUNSPECIFIED
Liu, C.University of Science and Technology of ChinaUNSPECIFIED
Chan, Ka LokKa.Chan (at) dlr.deUNSPECIFIED
Hu, Q.Anhui Institute of Optics and Fine MechanicsUNSPECIFIED
Liu, H.University of Science and Technology of ChinaUNSPECIFIED
Ji, X.University of Science and Technology of ChinaUNSPECIFIED
Zhu, Y.Anhui Institute of Optics and Fine MechanicsUNSPECIFIED
Liu, T.University of Science and Technology of ChinaUNSPECIFIED
Zhang, ChengxinUniversity of Science and Technology of ChinaUNSPECIFIED
Chen, Y.Anhui Institute of Optics and Fine MechanicsUNSPECIFIED
Liu, J.Anhui Institute of Optics and Fine MechanicsUNSPECIFIED
Date:23 November 2020
Journal or Publication Title:Atmospheric Measurement Techniques (AMT)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:13
DOI :10.5194/amt-13-6271-2020
Page Range:pp. 6271-6292
Publisher:Copernicus Publications
ISSN:1867-1381
Status:Published
Keywords:TROPOMI, S5P, HCHO, China
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Remote Sensing and Geo Research, Vorhaben Spectroscopic Methods in Remote Sensing (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Chan, Ka Lok
Deposited On:17 Dec 2020 19:00
Last Modified:10 Feb 2021 17:29

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