Retrieval of Water Vapour Profiles from GLORIA Nadir Observations
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 IS...
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ftubkarlsruhe:oai:EVASTAR-Karlsruhe.de:1000137551 2023-05-15T17:35:28+02:00 Retrieval of Water Vapour Profiles from GLORIA Nadir Observations König, Nils Wetzel, Gerald Höpfner, Michael Friedl-Vallon, Felix Johansson, Sören Kleinert, Anne Schneider, Matthias Ertl, Benjamin Ungermann, Jörn 2021-09-17 application/pdf https://publikationen.bibliothek.kit.edu/1000137551 https://publikationen.bibliothek.kit.edu/1000137551/126720032 https://doi.org/10.5445/IR/1000137551 eng eng MDPI info:eu-repo/semantics/altIdentifier/wos/000700093100001 info:eu-repo/semantics/altIdentifier/doi/10.3390/rs13183675 info:eu-repo/semantics/altIdentifier/issn/2072-4292 https://publikationen.bibliothek.kit.edu/1000137551 https://publikationen.bibliothek.kit.edu/1000137551/126720032 https://doi.org/10.5445/IR/1000137551 https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess CC-BY Remote sensing, 13 (18), Article no: 3675 ISSN: 2072-4292 atmospheric remote sensing water vapour nadir viewing limb viewing infrared Fourier-transform infrared spectroscopy ddc:550 Earth sciences info:eu-repo/classification/ddc/550 doc-type:article Text info:eu-repo/semantics/article article info:eu-repo/semantics/publishedVersion 2021 ftubkarlsruhe https://doi.org/10.5445/IR/1000137551 https://doi.org/10.3390/rs13183675 2023-01-22T23:31:50Z 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. 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. Article in Journal/Newspaper North Atlantic KITopen (Karlsruhe Institute of Technologie) |
institution |
Open Polar |
collection |
KITopen (Karlsruhe Institute of Technologie) |
op_collection_id |
ftubkarlsruhe |
language |
English |
topic |
atmospheric remote sensing water vapour nadir viewing limb viewing infrared Fourier-transform infrared spectroscopy ddc:550 Earth sciences info:eu-repo/classification/ddc/550 |
spellingShingle |
atmospheric remote sensing water vapour nadir viewing limb viewing infrared Fourier-transform infrared spectroscopy ddc:550 Earth sciences info:eu-repo/classification/ddc/550 König, Nils Wetzel, Gerald Höpfner, Michael Friedl-Vallon, Felix Johansson, Sören Kleinert, Anne Schneider, Matthias Ertl, Benjamin Ungermann, Jörn Retrieval of Water Vapour Profiles from GLORIA Nadir Observations |
topic_facet |
atmospheric remote sensing water vapour nadir viewing limb viewing infrared Fourier-transform infrared spectroscopy ddc:550 Earth sciences info:eu-repo/classification/ddc/550 |
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 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. 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. |
format |
Article in Journal/Newspaper |
author |
König, Nils Wetzel, Gerald Höpfner, Michael Friedl-Vallon, Felix Johansson, Sören Kleinert, Anne Schneider, Matthias Ertl, Benjamin Ungermann, Jörn |
author_facet |
König, Nils Wetzel, Gerald Höpfner, Michael Friedl-Vallon, Felix Johansson, Sören Kleinert, Anne Schneider, Matthias Ertl, Benjamin Ungermann, Jörn |
author_sort |
König, Nils |
title |
Retrieval of Water Vapour Profiles from GLORIA Nadir Observations |
title_short |
Retrieval of Water Vapour Profiles from GLORIA Nadir Observations |
title_full |
Retrieval of Water Vapour Profiles from GLORIA Nadir Observations |
title_fullStr |
Retrieval of Water Vapour Profiles from GLORIA Nadir Observations |
title_full_unstemmed |
Retrieval of Water Vapour Profiles from GLORIA Nadir Observations |
title_sort |
retrieval of water vapour profiles from gloria nadir observations |
publisher |
MDPI |
publishDate |
2021 |
url |
https://publikationen.bibliothek.kit.edu/1000137551 https://publikationen.bibliothek.kit.edu/1000137551/126720032 https://doi.org/10.5445/IR/1000137551 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Remote sensing, 13 (18), Article no: 3675 ISSN: 2072-4292 |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000700093100001 info:eu-repo/semantics/altIdentifier/doi/10.3390/rs13183675 info:eu-repo/semantics/altIdentifier/issn/2072-4292 https://publikationen.bibliothek.kit.edu/1000137551 https://publikationen.bibliothek.kit.edu/1000137551/126720032 https://doi.org/10.5445/IR/1000137551 |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.de info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5445/IR/1000137551 https://doi.org/10.3390/rs13183675 |
_version_ |
1766134644912160768 |