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Evaluating different methods for elevation calibration of MAX-DOAS (Multi AXis Differential Optical Absorption Spectroscopy) instruments during the CINDI-2 campaign

Donner, S. and Kuhn, J. and Van Roozendael, M. and Bais, A. and Beirle, S. and Bösch, T. and Bognar, K. and Bruchkouski, I. and Chan, K. L. and Dörner, S. and Drosoglou, T. and Fayt, C. and Frieß, U. and Hendrick, F. and Hermans, C. and Jin, J. and Li, A. and Ma, J. and Peters, E. and Pinardi, G. and Richter, A. and Schreier, S. F. and Seyler, A. and Strong, K. and Tirpitz, J.-L. and Wang, Y. and Xie, P. and Xu, J. and Zhao, X. and Wagner, T. (2020) Evaluating different methods for elevation calibration of MAX-DOAS (Multi AXis Differential Optical Absorption Spectroscopy) instruments during the CINDI-2 campaign. Atmospheric Measurement Techniques (AMT), 13 (2), pp. 685-712. Copernicus Publications. DOI: 10.5194/amt-13-685-2020 ISSN 1867-1381

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Official URL: https://www.atmos-meas-tech.net/13/685/2020/

Abstract

We present different methods for in-field elevation calibration of MAX-DOAS (Multi AXis Differential Optical Absorption Spectroscopy) instruments that were applied and inter-compared during the second Cabauw Intercomparison campaign for Nitrogen Dioxide measuring Instruments (CINDI-2). One necessary prerequisite of consistent MAX-DOAS retrievals is a precise and accurate calibration of the elevation angles of the different measuring systems. Therefore, different methods for this calibration were applied to several instruments during the campaign, and the results were inter-compared. This work first introduces and explains the different methods, namely far- and near-lamp measurements, white-stripe scans, horizon scans and sun scans, using data and results for only one (mainly the Max Planck Institute for Chemistry) instrument. In the second part, the far-lamp measurements and the horizon scans are examined for all participating groups. Here, the results for both methods are first inter-compared for the different instruments; secondly, the two methods are compared amongst each other. All methods turned out to be well-suited for the calibration of the elevation angles of MAX-DOAS systems, with each of them having individual advantages and drawbacks. Considering the results of this study, the systematic uncertainties of the methods can be estimated as ±0.05∘ for the far-lamp measurements and the sun scans, ±0.25∘ for the horizon scans, and around ±0.1∘ for the white-stripe and near-lamp measurements. When comparing the results of far-lamp and horizon-scan measurements, a spread of around 0.9∘ in the elevation calibrations is found between the participating instruments for both methods. This spread is of the order of a typical field of view (FOV) of a MAX-DOAS instrument and therefore affecting the retrieval results. Further, consistent (wavelength dependent) offsets of 0.32∘ and 0.40∘ between far-lamp measurements and horizon scans are found, which can be explained by the fact that, despite the flat topography around the measurement site, obstacles such as trees might mark the visible horizon during daytime. The observed wavelength dependence can be explained by surface albedo effects. Lastly, the results are discussed and recommendations for future campaigns are given.

Item URL in elib:https://elib.dlr.de/134891/
Document Type:Article
Title:Evaluating different methods for elevation calibration of MAX-DOAS (Multi AXis Differential Optical Absorption Spectroscopy) instruments during the CINDI-2 campaign
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Donner, S.Max Planck Institute for Chemistry, Mainz, GermanyUNSPECIFIED
Kuhn, J.Max Planck Institute for Chemistry, Mainz, GermanyUNSPECIFIED
Van Roozendael, M.BIRA-IASB – Royal Belgian Institute for Space Aeronomy, Brussels, BelgiumUNSPECIFIED
Bais, A.Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, GreeceUNSPECIFIED
Beirle, S.Max Planck Institute for Chemistry, Mainz, GermanyUNSPECIFIED
Bösch, T.Institute of Environmental Physics, University of Bremen, Bremen, GermanyUNSPECIFIED
Bognar, K.Department of Physics, University of Toronto, Toronto, CanadaUNSPECIFIED
Bruchkouski, I.National Ozone Monitoring Research and Education Center, Belarusian State University (BSU), Minsk, BelarusUNSPECIFIED
Chan, K. L.ka.chan (at) dlr.deUNSPECIFIED
Dörner, S.Max Planck Institute for Chemistry, Mainz, GermanyUNSPECIFIED
Drosoglou, T.Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, GreeceUNSPECIFIED
Fayt, C.BIRA-IASB – Royal Belgian Institute for Space Aeronomy, Brussels, BelgiumUNSPECIFIED
Frieß, U.Institute of Environmental Physics, University of Heidelberg, Heidelberg, GermanyUNSPECIFIED
Hendrick, F.BIRA-IASB – Royal Belgian Institute for Space Aeronomy, Brussels, BelgiumUNSPECIFIED
Hermans, C.BIRA-IASB – Royal Belgian Institute for Space Aeronomy, Brussels, BelgiumUNSPECIFIED
Jin, J.CMA Meteorological Observation Center, Beijing, ChinaUNSPECIFIED
Li, A.Anhui Institute of Optics and Fine Mechanics, Hefei, ChinaUNSPECIFIED
Ma, J.Chinese Academy of Meteorological Sciences, Beijing, ChinaUNSPECIFIED
Peters, E.Institute of Environmental Physics, University of Bremen, Bremen, GermanyUNSPECIFIED
Pinardi, G.BIRA-IASB – Royal Belgian Institute for Space Aeronomy, Brussels, BelgiumUNSPECIFIED
Richter, A.Institute of Environmental Physics, University of Bremen, Bremen, GermanyUNSPECIFIED
Schreier, S. F.Institute of Meteorology, University of Natural Resources and Life Sciences, Vienna, AustriaUNSPECIFIED
Seyler, A.Institute of Environmental Physics, University of Bremen, Bremen, GermanyUNSPECIFIED
Strong, K.Department of Physics, University of Toronto, Toronto, CanadaUNSPECIFIED
Tirpitz, J.-L.Institute of Environmental Physics, University of Heidelberg, Heidelberg, GermanyUNSPECIFIED
Wang, Y.Max Planck Institute for Chemistry, Mainz, GermanyUNSPECIFIED
Xie, P.Anhui Institute of Optics and Fine Mechanics, Hefei, ChinaUNSPECIFIED
Xu, J.Anhui Institute of Optics and Fine Mechanics, Hefei, ChinaUNSPECIFIED
Zhao, X.Department of Physics, University of Toronto, Toronto, CanadaUNSPECIFIED
Wagner, T.thomas.wagner (at) mpic.deUNSPECIFIED
Date:13 February 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-13-685-2020
Page Range:pp. 685-712
Publisher:Copernicus Publications
ISSN:1867-1381
Status:Published
Keywords:MAX-DOAS, calibration
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):Vorhaben Spectroscopic Methods in Remote Sensing
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Chan, Ka Lok
Deposited On:14 May 2020 11:42
Last Modified:14 May 2020 11:42

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