NDLI: Retrieval of Water Vapour Profiles from GLORIA Nadir Observations

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Retrieval of Water Vapour Profiles from GLORIA Nadir Observations

Content Provider	MDPI
Author	Nils, König Michael, Höpfner Wetzel, Gerald Friedl-Vallon, Felix Johansson, Sören Kleinert, Anne Schneider, Matthias Ertl, Benjamin Ungermann, Jörn
Copyright Year	2021
Description	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 H $2$ O 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. An intercomparison of multiple water vapour profiles from GLORIA in nadir and limb observational modes, IASI (Infrared Atmospheric Sounding Interferometer) satellite data from two different retrieval processors, and radiosonde measurements shows a broad consistency between the profiles. The comparison shows how fine vertical structures are represented by nadir sounders as well as the influence of a priori information on the retrievals.
Starting Page	3675
e-ISSN	20724292
DOI	10.3390/rs13183675
Journal	Remote Sensing
Issue Number	18
Volume Number	13
Language	English
Publisher	MDPI
Publisher Date	2021-09-14
Access Restriction	Open
Subject Keyword	Remote Sensing Marine Engineering Atmospheric Remote Sensing Water Vapour Nadir Viewing Limb Viewing Infrared Fourier-transform Infrared Spectroscopy
Content Type	Text
Resource Type	Article

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