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MAX-DOAS measurements of tropospheric NO₂ and HCHO in Munich and the comparison to OMI and TROPOMI satellite observations

Chan, Ka Lok and Wiegner, M. and van Geffen, J. and De Smedt, I. and Alberti, C. and Cheng, Zhibin and Ye, S. and Wenig, M. (2020) MAX-DOAS measurements of tropospheric NO₂ and HCHO in Munich and the comparison to OMI and TROPOMI satellite observations. Atmospheric Measurement Techniques (AMT), 13 (8), pp. 4499-4520. Copernicus Publications. doi: 10.5194/amt-13-4499-2020. ISSN 1867-1381.

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Official URL: https://amt.copernicus.org/articles/13/4499/2020/

Abstract

We present two-dimensional scanning Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations of nitrogen dioxide (NO2) and formaldehyde (HCHO) in Munich. Vertical columns and vertical distribution profiles of aerosol extinction coefficient, NO2 and HCHO are retrieved from the 2D MAX-DOAS observations. The measured surface aerosol extinction coefficients and NO2 mixing ratios derived from the retrieved profiles are compared to in situ monitoring data, and the surface NO2 mixing ratios show a good agreement with in situ monitoring data with a Pearson correlation coefficient (R) of 0.91. The aerosol optical depths (AODs) show good agreement as well (R = 0.80) when compared to sun photometer measurements. Tropospheric vertical column densities (VCDs) of NO2 and HCHO derived from the MAX-DOAS measurements are also used to validate Ozone Monitoring Instrument (OMI) and TROPOspheric Monitoring Instrument (TROPOMI) satellite observations. Monthly averaged data show a good correlation; however, satellite observations are on average 30 % lower than the MAX-DOAS measurements. Furthermore, the MAX-DOAS observations are used to investigate the spatiotemporal characteristic of NO2 and HCHO in Munich. Analysis of the relations between aerosol, NO2 and HCHO shows higher aerosol-to-HCHO ratios in winter, which reflects a longer atmospheric lifetime of secondary aerosol and HCHO during winter. The analysis also suggests that secondary aerosol formation is the major source of these aerosols in Munich.

Item URL in elib:https://elib.dlr.de/136288/
Document Type:Article
Title:MAX-DOAS measurements of tropospheric NO₂ and HCHO in Munich and the comparison to OMI and TROPOMI satellite observations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Chan, Ka LokKa.Chan (at) dlr.deUNSPECIFIED
Wiegner, M.matthias.wiegner (at) lmu.deUNSPECIFIED
van Geffen, J.geffen (at) knmi.nlUNSPECIFIED
De Smedt, I.isabelle.desmedt (at) aeronomie.beUNSPECIFIED
Alberti, C.carlos.alberti (at) kit.eduUNSPECIFIED
Cheng, ZhibinZhibin.Cheng (at) dlr.deUNSPECIFIED
Ye, S.sheng.ye (at) physik.uni-muenchen.deUNSPECIFIED
Wenig, M.mark.wenig (at) lmu.deUNSPECIFIED
Date:19 August 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-13-4499-2020
Page Range:pp. 4499-4520
Publisher:Copernicus Publications
ISSN:1867-1381
Status:Published
Keywords:MAX-DOAS, NO2, HCHO, pollution, transport
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):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:09 Oct 2020 09:03
Last Modified:15 Jul 2021 16:26

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