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Retrieval of temperature profiles from CHAMP for climate monitoring: intercomparison with Envisat MIPAS and GOMOS and different atmospheric analyses

Gobiet, A.; Kirchengast, G.; Manney, G. L.; Borsche, M.; Retscher, C.; Stiller, G. ORCID iD icon 1
1 Forschungszentrum Karlsruhe (FZKA)


This study describes and evaluates a Global Navigation Satellite System (GNSS) radio occultation (RO) retrieval scheme particularly aimed at delivering bias-free atmospheric parameters for climate monitoring and research. The focus of the retrieval is on the sensible use of a priori information for careful high-altitude initialisation in order to maximise the usable altitude range. The RO retrieval scheme has been meanwhile applied to more than five years of data (September 2001 to present) from the German CHAllenging Minisatellite Payload for geoscientific research (CHAMP) satellite. In this study it was validated against various correlative datasets including the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) and the Global Ozone Monitoring for Occultation of Stars (GOMOS) sensors on Envisat, five different atmospheric analyses, and the operational CHAMP retrieval product from GeoForschungsZentrum (GFZ) Potsdam. In the global mean within 10 to 30 km altitude we find that the present validation observationally constrains the potential RO temperature bias to be <0.2 K. Latitudinally resolved analyses show biases to be observationally constrained to <0.2–0.5K up to 35 km in most cases, and up to 30 km in any case, even if severely biased (about 10K or more) a priori information is used in the high altitude initialisation of the retrieval. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000071686
Veröffentlicht am 25.05.2018
DOI: 10.5194/acp-7-3519-2007
Zitationen: 48
Zitationen: 58
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2007
Sprache Englisch
Identifikator ISSN: 1680-7324, 1680-7316
KITopen-ID: 1000071686
HGF-Programm 12.04.02 (POF I, LK 01) Dynamik und Chemie der Stratosphäre
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 7
Heft 13
Seiten 3519–3536
Nachgewiesen in Scopus
Web of Science
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