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CO Total Column Retrieval from SCIAMACHY: Full-Mission Validation with NDACC and TCCON

Hochstaffl, Philipp und Schreier, Franz und Gimeno-Garcia, Sebastian und Lichtenberg, Günter (2017) CO Total Column Retrieval from SCIAMACHY: Full-Mission Validation with NDACC and TCCON. IWGGMS #13 Helsinki, 2017-06-06 - 2017-06-08, Helsinki.

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Kurzfassung

Verification and validation are critical elements of any code development, and mandatory for the assessment of spaceborne remote sensing products. The objective was to perform intercomparisons of CO columns estimated from SCIAMACHY with temporal coincidented and co-located retrievals provided by ground-based Fourier transform infrared spectroscopy. More specifically, we used column averaged dry air mole fractions from several NDACC (Network for the Detection of Atmospheric Composition Change) and TCCON (Total Carbon Column Observing Network) stations. Like SCIAMACHY's channel 8 the TCCON instruments utilize the 2.3 mue band of carbon monoxide, whereas NDACC observes the CO mid infrared absorption. In most cases, satellite validation is based on statistical comparison (specifically true for SCIAMACHY with its large signal to noise ratio per observation (Gimeno Garcia et al. 2011)) with reference data. However, satellite and reference measurements do neither exactly match in time and space (mistime and misdistance) nor address the same volume of air (misintegration). Hence, the natural atmospheric variability leads to differences between both data sets and these differences must not be interpreted in terms of a satellites instrument malfunction (Verhoelst et al. 2015). The validation strategy presented here accounts for spatial (and in selected cases temporal) induced mismatches. The outcome of the study demonstrates that spatial (and temporal) averaging is required in order to minimize representation errors. Increased deviations of the spaceborne and ground-based columns in the later years of the mission clearly demonstrated the impact of the degrading channel 8 detector. Therefore, in order to perform a comprehensive full-mission (2003 - 2012) validation of the SCIAMACHY dataset, an approach providing more observations within a given time interval and sampling area had been utilized. The results reveal that the combination of these methods lead to acceptable agreement of SCIAMACHY CO data with most g-b reference sites (within the standard deviation). In addition the effect of whether using the mean or median of the datasets for comparison was investigated. The outcome demonstrates that the differences between the SCIAMACHY CO mean and median values are within 1-10 percent in most cases and within the standard deviation of the reference observations.

elib-URL des Eintrags:https://elib.dlr.de/113843/
Dokumentart:Konferenzbeitrag (Poster)
Titel:CO Total Column Retrieval from SCIAMACHY: Full-Mission Validation with NDACC and TCCON
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Hochstaffl, Philippphilipp.hochstaffl (at) dlr.dehttps://orcid.org/0000-0001-9537-3050NICHT SPEZIFIZIERT
Schreier, FranzFranz.Schreier (at) dlr.dehttps://orcid.org/0000-0001-7196-6599NICHT SPEZIFIZIERT
Gimeno-Garcia, Sebastiansebastian.gimenogarcia (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Lichtenberg, Günterguenter.lichtenberg (at) dlr.dehttps://orcid.org/0000-0002-3335-2008NICHT SPEZIFIZIERT
Datum:Juni 2017
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:validation SCIAMACHY NDACC TCCON groundbased carbon-monoxide weighting mismatch representation-errors
Veranstaltungstitel:IWGGMS #13 Helsinki
Veranstaltungsort:Helsinki
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:6 Juni 2017
Veranstaltungsende:8 Juni 2017
Veranstalter :Finnish Meteorological Institute
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):Vorhaben Spektroskopische Verfahren in der Fernerkundung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Atmosphärenprozessoren
Hinterlegt von: Hochstaffl, Dr. Philipp
Hinterlegt am:31 Aug 2017 10:35
Letzte Änderung:24 Apr 2024 20:18

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