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Formaldehyde and Glyoxal: New Products in the SCIAMACHY Operational Processor

Hrechanyy, Serhiy und De Smedt, Isabelle und Kretschel, Klaus und Lichtenberg, Günter und Meringer, Markus und Wittrock, Folkard (2010) Formaldehyde and Glyoxal: New Products in the SCIAMACHY Operational Processor. COSPAR 2010, 17-24 Jul 2010, Bremen, Germany.

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In sommer of 2010 version 6 of the SCIAMACHY operational processor is planned to be delivered to ESA. The SCIAMACHY Quality Working Group recommended an implementation of the formaldehyde (HCHO) and glyoxal (CHOCHO) vertical columns into version 6 of the off-line processor. They are formed during the oxidation of volatile organic compounds (VOCs) emitted by plants, anthropogenic activities, and biomass burning. Due to a rather short lifetime of formaldehyde and glyoxal, their distribution maps, obtained by the SCIAMACHY, represent the emission fields of their precursors, VOCs. The descriptions of reference algorithm as well as all the cross-sections for formaldehyde and glyoxal retrievals were delivered to DLR by the Belgian Institute for Space Aeronomy (BIRA) (I. De Smedt, 2008) and by the IUP (F. Wittrock, 2006), respectively. Both retrievals are based on the DOAS technique. For the formaldehyde retrieval the spectral region of 328.5-346 nm was recommended. The absorption cross-sections of HCHO, O3, NO2, BrO, OClO, a Ring spectrum and a polynomial of the fifth order are included into the fitting procedure. Before conversion to the vertical columns, the slant columns have to be normalized by subtracting the slant columns measured over Pacific ocean, where the only source of formaldehyde is methane oxidation. After the conversion to the vertical columns, part of HCHO removed during the previous procedure has to be re-added to the final vertical column by adding of the mean vertical column calculated by the tropospheric chemistry model IMAGES (J.-F. Müller, 1995). This normalization is necessary to compensate for the offset introduced by the solar reference measurements and interferences by other absorbers. For the determination of glyoxal columns, the spectral region 435-457 nm was selected. In this case, the absorption cross-sections of CHOCHO, O3, NO2, H2O, O4, a Ring spectrum and a cubic polynomial are included in the fitting procedure. The normalization of the CHOCHO slant columns is performed in the same way as for formaldehyde.

Dokumentart:Konferenzbeitrag (Poster)
Titel:Formaldehyde and Glyoxal: New Products in the SCIAMACHY Operational Processor
AutorenInstitution oder E-Mail-Adresse der Autoren
Hrechanyy, SerhiySerhiy.Hrechanyy@dlr.de
De Smedt, IsabelleIsabelle.Desmedt@aeronomie.be
Kretschel, KlausKlaus.Kretschel@dlr.de
Lichtenberg, GünterGuenter.Lichtenberg@dlr.de
Meringer, MarkusMarkus.Meringer@dlr.de
Wittrock, Folkardfolkard@iup.physik.uni-bremen.de
Datum:20 Juli 2010
Stichwörter:SCIAMACHY, formaldehyde, glyoxal, DOAS
Veranstaltungstitel:COSPAR 2010
Veranstaltungsort:Bremen, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:17-24 Jul 2010
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 - Projekt ENVISAT (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Atmosphärenprozessoren
Hinterlegt von: Serhiy Hrechanyy
Hinterlegt am:29 Okt 2010 08:00
Letzte Änderung:12 Dez 2013 21:03

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