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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ftmdpi:oai:mdpi.com:/2072-4292/13/18/3675/ 2023-08-20T04:08:28+02:00 Retrieval of Water Vapour Profiles from GLORIA Nadir Observations Nils König Gerald Wetzel Michael Höpfner Felix Friedl-Vallon Sören Johansson Anne Kleinert Matthias Schneider Benjamin Ertl Jörn Ungermann agris 2021-09-14 application/pdf https://doi.org/10.3390/rs13183675 EN eng Multidisciplinary Digital Publishing Institute Atmospheric Remote Sensing https://dx.doi.org/10.3390/rs13183675 https://creativecommons.org/licenses/by/4.0/ Remote Sensing; Volume 13; Issue 18; Pages: 3675 atmospheric remote sensing water vapour nadir viewing limb viewing infrared Fourier-transform infrared spectroscopy Text 2021 ftmdpi https://doi.org/10.3390/rs13183675 2023-08-01T02:42:01Z 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. Text North Atlantic MDPI Open Access Publishing Remote Sensing 13 18 3675 |
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Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
atmospheric remote sensing water vapour nadir viewing limb viewing infrared Fourier-transform infrared spectroscopy |
spellingShingle |
atmospheric remote sensing water vapour nadir viewing limb viewing infrared Fourier-transform infrared spectroscopy Nils König Gerald Wetzel Michael Höpfner Felix Friedl-Vallon Sören Johansson Anne Kleinert Matthias Schneider Benjamin Ertl Jörn Ungermann 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 |
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 |
Text |
author |
Nils König Gerald Wetzel Michael Höpfner Felix Friedl-Vallon Sören Johansson Anne Kleinert Matthias Schneider Benjamin Ertl Jörn Ungermann |
author_facet |
Nils König Gerald Wetzel Michael Höpfner Felix Friedl-Vallon Sören Johansson Anne Kleinert Matthias Schneider Benjamin Ertl Jörn Ungermann |
author_sort |
Nils König |
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 |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/rs13183675 |
op_coverage |
agris |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Remote Sensing; Volume 13; Issue 18; Pages: 3675 |
op_relation |
Atmospheric Remote Sensing https://dx.doi.org/10.3390/rs13183675 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/rs13183675 |
container_title |
Remote Sensing |
container_volume |
13 |
container_issue |
18 |
container_start_page |
3675 |
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1774720750723268608 |