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

SCIAMACHY: Spectral Calibration in the SWIR Channels

Lichtenberg, Günter und Hamidouche, Mourad und Schreier, Franz und Hochstaffl, Philipp und Meringer, Markus (2016) SCIAMACHY: Spectral Calibration in the SWIR Channels. ACVE 2016 Atmospheric Composition Validation and Evolution, 2016-10-18 - 2016-10-20, ESA ESRIN Frascati, Italy.

[img] PDF
23MB

Kurzfassung

SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) is a scanning nadir and limb spectrometer covering the wavelength range from 212 nm to 2386 nm in 8 channels. It is a joint project of Germany, the Netherlands and Belgium and was launched in February 2002 on the ENVISAT platform. After the platform failure in April 2012, SCIAMACHY is now in the postprocessing phase F. SCIAMACHY's originally specified in-orbit lifetime was double the planned lifetime. SCIAMACHY was designed to measure column densities and vertical profiles of trace gas species in the mesosphere, in the stratosphere and in the troposphere (Bovensmann et al., 1999). It can detect a large amount of atmospheric gases (e.g. O3, H2CO, CHOCHO, SO2, BrO, OClO, NO2, H2O, CO, CH4, among others ) and can provide information about aerosols and clouds. The standard spectral calibration of the SCIAMACHY detectors is done with an on-board Spectral Line Source (SLS) by comparing theoretical line positions with line positions retrieved during calibration measurements. However, the used PtCrNe lamp does not have enough strong lines in the SWIR range (channels 6 -8 ) upwards of 1000 nm. The retrieval of in-flight line positions is additionally hampered by many damaged detector pixels of the SWIR detectors. An analysis of the mission data showed that for channels 6-8 no in-flight correction of the on-ground spectral calibration can be done with the standard approach, even at the beginning of the mission with a significant lower number of damaged pixels. We therefore started a study to investigate an alternative spectral calibration approach. In this approach a highly resolved reference spectrum is fitted with a DOAS like algorithm to retrieve the wavelength for each detector pixel. This approach was already tested by us for the Sentinel-4 UVN and the former Earth Explorer 8 candidate mission CarbonSat. For the method to work it is essential to have a good knowledge of the in-flight spectral response function and its change over time. Preliminary results show that the shape of the response function deviates from the current assumption of a Gaussian. For a successful fit it is also necessary to handle the many outliers caused by the bad pixels in an appropriate way. In this paper we present the first results of our investigations, focussing on channel 6 and the methane retrieval window.

elib-URL des Eintrags:https://elib.dlr.de/108654/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:SCIAMACHY: Spectral Calibration in the SWIR Channels
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Lichtenberg, GünterGuenter.Lichtenberg (at) dlr.dehttps://orcid.org/0000-0002-3335-2008NICHT SPEZIFIZIERT
Hamidouche, Mouradmourad.hamidouche (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schreier, FranzFranz.Schreier (at) dlr.dehttps://orcid.org/0000-0001-7196-6599NICHT SPEZIFIZIERT
Hochstaffl, Philippphilipp.hochstaffl (at) dlr.dehttps://orcid.org/0000-0001-9537-3050NICHT SPEZIFIZIERT
Meringer, MarkusMarkus.Meringer (at) dlr.dehttps://orcid.org/0000-0001-8526-2429NICHT SPEZIFIZIERT
Datum:18 Oktober 2016
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:SCIAMACHY spectral calibration atmosphere
Veranstaltungstitel:ACVE 2016 Atmospheric Composition Validation and Evolution
Veranstaltungsort:ESA ESRIN Frascati, Italy
Veranstaltungsart:Workshop
Veranstaltungsbeginn:18 Oktober 2016
Veranstaltungsende:20 Oktober 2016
Veranstalter :ESA
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 - Projekt ENVISAT (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Atmosphärenprozessoren
Hinterlegt von: Lichtenberg, Günter
Hinterlegt am:30 Nov 2016 17:59
Letzte Änderung:24 Apr 2024 20:13

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

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