elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

First remote sensing measurements of ClOOCl along with ClO and ClONO2 in activated and deactivated Arctic vortex conditions using new ClOOCl IR absorption cross sections

Wetzel, G. und Oelhaf, H. und Kirner, O. und Ruhnke, R. und Friedl-Vallon, F. und Kleinert, A. und Maucher, G. und Fischer, H. und Birk, Manfred und Wagner, Georg und Engel, A. (2010) First remote sensing measurements of ClOOCl along with ClO and ClONO2 in activated and deactivated Arctic vortex conditions using new ClOOCl IR absorption cross sections. Atmospheric Chemistry and Physics, 10, Seiten 931-945. Copernicus Publications on behalf of the European Geosciences Union.

[img]
Vorschau
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
1MB

Kurzfassung

Abstract. Active chlorine species play a dominant role in the catalytic destruction of stratospheric ozone in the polar vortices during the late winter and early spring seasons. Recently, the correct understanding of the ClO dimer cycle was challenged by the release of new laboratory absorption cross sections (Pope et al., 2007) yielding significant model underestimates of observed ClO and ozone loss (von Hobe et al., 2007). Under this aspect, nocturnal Arctic stratospheric limb emission measurements carried out by the balloon version of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS-B) from Kiruna (Sweden) on 11 January 2001 and 20/21 March 2003 have been reanalyzed with regard to the chlorine reservoir species ClONO2 and the active species, ClO and ClOOCl (Cl2O2). New laboratory measurements of IR absorption cross sections of ClOOCl for various temperatures and pressures allowed for the first time the retrieval of ClOOCl mixing ratios from remote sensing measurements. High values of active chlorine (ClOx) of roughly 2.3 ppbv at 20 km were observed by MIPAS-B in the cold mid-winter Arctic vortex on 11 January 2001. While nighttime ClOOCl shows enhanced values of nearly 1.1 ppbv at 20 km, ClONO2 mixing ratios are less than 0.1 ppbv at this altitude. In contrast, high ClONO2 mixing ratios of nearly 2.4 ppbv at 20 km have been observed in the late winter Arctic vortex on 20 March 2003. No significant ClOx amounts are detectable on this date since most of the active chlorine has already recovered to its main reservoir species ClONO2. The observed values of ClOx and ClONO2 are in line with the established polar chlorine chemistry. The thermal equilibrium constants between the dimer formation and its dissociation, as derived from the balloon measurements, are on the lower side of reported data and in good agreement with values recommended by von Hobe et al. (2007). Calculations with the ECHAM/MESSy Atmospheric Chemistry model (EMAC) using established kinetics show similar chlorine activation and deactivation, compared to the measurements in January 2001 and March 2003, respectively.

Dokumentart:Zeitschriftenbeitrag
Titel:First remote sensing measurements of ClOOCl along with ClO and ClONO2 in activated and deactivated Arctic vortex conditions using new ClOOCl IR absorption cross sections
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Wetzel, G.Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany
Oelhaf, H.Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany
Kirner, O.Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany
Ruhnke, R.Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany
Friedl-Vallon, F.Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany
Kleinert, A.Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany
Maucher, G.Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany
Fischer, H.Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany
Birk, Manfredmanfred.birk@dlr.de
Wagner, Georggeorg.wagner@dlr.de
Engel, A.Institut für Atmosphäre und Umwelt, J. W. Goethe Universität Frankfurt, Frankfurt, Germany
Datum:2010
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:10
Seitenbereich:Seiten 931-945
Verlag:Copernicus Publications on behalf of the European Geosciences Union
Status:veröffentlicht
Stichwörter:atmospheric remote sensing, MIPAS-B, chlorine, ClOOCl, ClO dimer, chlorine peroxide, infrared absorption cross sections, arctic perturbed chemistry
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Experimentelle Verfahren
Hinterlegt von: Dr.rer.nat. Georg Wagner
Hinterlegt am:05 Jul 2010 10:13
Letzte Änderung:12 Dez 2013 20:58

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.