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Formaldehyde and Glyoxal: New Products in the SCIAMACHY Operational Processor

Hrechanyy, Serhiy and De Smedt, Isabelle and Kretschel, Klaus and Lichtenberg, Günter and Meringer, Markus and 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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Abstract

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.

Document Type:Conference or Workshop Item (Poster)
Title:Formaldehyde and Glyoxal: New Products in the SCIAMACHY Operational Processor
Authors:
AuthorsInstitution or Email of Authors
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
Date:20 July 2010
Status:Published
Keywords:SCIAMACHY, formaldehyde, glyoxal, DOAS
Event Title:COSPAR 2010
Event Location:Bremen, Germany
Event Type:international Conference
Event Dates:17-24 Jul 2010
Organizer:COMMITTEE ON SPACE RESEARCH
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Projekt ENVISAT (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Serhiy Hrechanyy
Deposited On:29 Oct 2010 08:00
Last Modified:12 Dec 2013 21:03

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