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Retrieval of Water Vapour Profiles from GLORIA Nadir Observations

König, Nils 1; Wetzel, Gerald 1; Höpfner, Michael ORCID iD icon 1; Friedl-Vallon, Felix 1; Johansson, Sören ORCID iD icon 1; Kleinert, Anne 1; Schneider, Matthias 1; Ertl, Benjamin 1,2; Ungermann, Jörn
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)
2 Steinbuch Centre for Computing (SCC), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

We present the first analysis of water vapour profiles derived from nadir measurements by the infrared imaging Fourier transform spectrometer GLORIA (Gimballed Limb Observer for Radiance Imaging of the Atmosphere). The measurements were performed on 27 September 2017, during the WISE (Wave driven ISentropic Exchange) campaign aboard the HALO aircraft over the North Atlantic in an area between 37°–50°N and 20°–28°W. From each nadir recording of the 2-D imaging spectrometer, the spectral radiances of all non-cloudy pixels have been averaged after application of a newly developed cloud filter. From these mid-infrared nadir spectra, vertical profiles of H2O have been retrieved with a vertical resolution corresponding to five degrees of freedom below the aircraft. Uncertainties in radiometric calibration, temperature and spectroscopy have been identified as dominating error sources. Comparing retrievals resulting from two different a priori assumptions (constant exponential vs. ERA 5 reanalysis data) revealed parts of the flight where the observations clearly show inconsistencies with the ERA 5 water vapour fields. Further, a water vapour inversion at around 6 km altitude could be identified in the nadir retrievals and confirmed by a nearby radiosonde ascent. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000137551
Veröffentlicht am 17.09.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Institut für Meteorologie und Klimaforschung (IMK)
Steinbuch Centre for Computing (SCC)
Universität Karlsruhe (TH) – Zentrale Einrichtungen (Zentrale Einrichtungen)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2072-4292
KITopen-ID: 1000137551
HGF-Programm 12.11.25 (POF IV, LK 01) Atmospheric composition and circulation changes
Weitere HGF-Programme 46.21.01 (POF IV, LK 01) Domain-Specific Simulation & SDLs and Research Groups
Erschienen in Remote sensing
Verlag MDPI
Band 13
Heft 18
Seiten Article no: 3675
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 14.09.2021
Schlagwörter atmospheric remote sensing; water vapour; nadir viewing; limb viewing; infrared; Fourier-transform infrared spectroscopy
Nachgewiesen in Dimensions
Web of Science
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