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Airborne DOAS limb measurements of tropospheric trace gas profiles: case study on the profile retrieval of O4 and BrO

Prados-Roman, C. und Butz, A. und Deutschmann, T. und Dorf, M. und Kritten, L. und Minikin, Andreas und Platt, U. und Schlager, Hans und Sihler, H. und Theys, N. und Van Roozendael, M. und Wagner, T. und Pfeilsticker, K. (2011) Airborne DOAS limb measurements of tropospheric trace gas profiles: case study on the profile retrieval of O4 and BrO. Atmospheric Measurement Techniques, 4, Seiten 1241-1260. European Geosciences Union. DOI: 10.5194/amt-4-1241-2011.

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Offizielle URL: http://www.atmos-meas-tech.net/4/1241/2011/amt-4-1241-2011.html

Kurzfassung

A novel limb scanning mini-DOAS spectrometer for the detection of UV/vis absorbing radicals (e.g., O3, BrO, IO, HONO) was deployed on the DLR-Falcon (Deutsches Zentrum f�¼r Luft- und Raumfahrt) aircraft and tested during the ASTAR 2007 campaign (Arctic Study of Tropospheric Aerosol, Clouds and Radiation) that took place at Svalbard (78�° N) in spring 2007. Our main objectives during this campaign were to test the instrument, and to perform spectral and profile retrievals of tropospheric trace gases, with particular interest on investigating the distribution of halogen compounds (e.g., BrO) during the so-called ozone depletion events (ODEs). In the present work, a new method for the retrieval of vertical profiles of tropospheric trace gases from tropospheric DOAS limb observations is presented. Major challenges arise from modeling the radiative transfer in an aerosol and cloud particle loaded atmosphere, and from overcoming the lack of a priori knowledge of the targeted trace gas vertical distribution (e.g., unknown tropospheric BrO vertical distribution). Here, those challenges are tackled by a mathematical inversion of tropospheric trace gas profiles using a regularization approach constrained by a retrieved vertical profile of the aerosols extinction coefficient EM. The validity and limitations of the algorithm are tested with in situ measured EM, and with an absorber of known vertical profile (O4). The method is then used for retrieving vertical profiles of tropospheric BrO. Results indicate that, for aircraft ascent/descent observations, the limit for the BrO detection is roughly 1.5 pptv (pmol molâ��1), and the BrO profiles inferred from the boundary layer up to the upper troposphere and lower stratosphere have around 10 degrees of freedom. For the ASTAR 2007 deployments during ODEs, the retrieved BrO vertical profiles consistently indicate high BrO mixing ratios (â�¼15 pptv) within the boundary layer, low BrO mixing ratios (â�¤1.5 pptv) in the free troposphere, occasionally enhanced BrO mixing ratios (â�¼1.5 pptv) in the upper troposphere, and increasing BrO mixing ratios with altitude in the lowermost stratosphere. These findings agree reasonably well with satellite and balloon-borne soundings of total and partial BrO atmospheric column densities.

Dokumentart:Zeitschriftenbeitrag
Titel:Airborne DOAS limb measurements of tropospheric trace gas profiles: case study on the profile retrieval of O4 and BrO
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Prados-Roman, C.Univ. of Heidelberg
Butz, A.SRON, Utrecht, NL
Deutschmann, T.Univ. of Heidelberg
Dorf, M.Univ. of Heidelberg
Kritten, L.Univ. of Heidelberg
Minikin, AndreasNICHT SPEZIFIZIERT
Platt, U.Univ. of Heidelberg
Schlager, HansNICHT SPEZIFIZIERT
Sihler, H.Univ. of Heidelberg
Theys, N.BIRA-IASB, B
Van Roozendael, M.BIRA-IASB, B
Wagner, T.MPIC, Mainz
Pfeilsticker, K.Univ. of Heidelberg
Datum:2011
Erschienen in:Atmospheric Measurement Techniques
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:4
DOI :10.5194/amt-4-1241-2011
Seitenbereich:Seiten 1241-1260
Verlag:European Geosciences Union
Status:veröffentlicht
Stichwörter:DOAS, ASTAR, Falcon, tropospheric trace gas profiles, Svalbard
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Atmosphären- und Klimaforschung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Dr.rer.nat. Andreas Minikin
Hinterlegt am:07 Dez 2011 14:04
Letzte Änderung:12 Dez 2013 21:27

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