On the use of IASI spectrally resolved radiances to test the EC-Earth climate model (v3.3.3) in clear-sky conditions
The long-term comparison between simulated and observed spectrally resolved radiances can represent a stringent test for the direct verification and improvement of General Circulation Models (GCMs). From the mid of 2000s, stable hyperspectral observations of the Mid-Infrared region (667 to 2750 cm-1...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00062088 2023-05-15T18:18:51+02:00 On the use of IASI spectrally resolved radiances to test the EC-Earth climate model (v3.3.3) in clear-sky conditions Della Fera, Stefano Fabiano, Federico Raspollini, Piera Ridolfi, Marco Cortesi, Ugo Barbara, Flavio von Hardenberg, Jost 2022-08 electronic https://doi.org/10.5194/egusphere-2022-479 https://noa.gwlb.de/receive/cop_mods_00062088 https://egusphere.copernicus.org/preprints/egusphere-2022-479/egusphere-2022-479.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2022-479 https://noa.gwlb.de/receive/cop_mods_00062088 https://egusphere.copernicus.org/preprints/egusphere-2022-479/egusphere-2022-479.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/egusphere-2022-479 2022-08-07T23:11:57Z The long-term comparison between simulated and observed spectrally resolved radiances can represent a stringent test for the direct verification and improvement of General Circulation Models (GCMs). From the mid of 2000s, stable hyperspectral observations of the Mid-Infrared region (667 to 2750 cm-1) the Earth emission spectrum have been provided by different sensors (e.g., AIRS, IASI and CrIS). In addition, the FORUM mission, selected to be the ninth ESA Earth Explorer mission, will measure, starting from 2027, the terrestrial radiation emitted to space at the top of the atmosphere (TOA) from 100 to 1600 cm-1 filling the observational gap in the far-infrared (FIR) region, from 100 to 667 cm-1. In this work, in anticipation of FORUM measurements, we compare existing IASI observations to radiances simulated on the basis of the atmospheric fields predicted by the EC-Earth GCM (version 3.3.3) in clear-sky conditions. In order to simulate spectra based on the atmospheric and surface state provided by the climate model, the radiative transfer model σ-IASI has been implemented in the Cloud Feedback Model Intercomparison Project (COSP) package. Therefore, on-line simulations provided by EC-Earth model equipped with the new COSP + σ-IASI module have been performed in clear-sky conditions with prescribed sea surface temperature and sea-ice cover, every 6 hours, over a timeframe consistent with the availability of IASI data. Systematic comparisons between observed IASI MetOp-A L1C data and model outputs have been performed in 10 cm-1 spectral intervals, on global and regional scales, by distinguishing the surface type (land, sea). The long term analysis shows a warm bias of the climate model in the roto-vibrational water vapour bands and in the CO2 absorption band. These biases represent a strong evidence of a temperature bias of the model in the upper-troposphere and in the stratosphere, while a cold bias occurs over land. Article in Journal/Newspaper Sea ice Cris Niedersächsisches Online-Archiv NOA |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Della Fera, Stefano Fabiano, Federico Raspollini, Piera Ridolfi, Marco Cortesi, Ugo Barbara, Flavio von Hardenberg, Jost On the use of IASI spectrally resolved radiances to test the EC-Earth climate model (v3.3.3) in clear-sky conditions |
topic_facet |
article Verlagsveröffentlichung |
description |
The long-term comparison between simulated and observed spectrally resolved radiances can represent a stringent test for the direct verification and improvement of General Circulation Models (GCMs). From the mid of 2000s, stable hyperspectral observations of the Mid-Infrared region (667 to 2750 cm-1) the Earth emission spectrum have been provided by different sensors (e.g., AIRS, IASI and CrIS). In addition, the FORUM mission, selected to be the ninth ESA Earth Explorer mission, will measure, starting from 2027, the terrestrial radiation emitted to space at the top of the atmosphere (TOA) from 100 to 1600 cm-1 filling the observational gap in the far-infrared (FIR) region, from 100 to 667 cm-1. In this work, in anticipation of FORUM measurements, we compare existing IASI observations to radiances simulated on the basis of the atmospheric fields predicted by the EC-Earth GCM (version 3.3.3) in clear-sky conditions. In order to simulate spectra based on the atmospheric and surface state provided by the climate model, the radiative transfer model σ-IASI has been implemented in the Cloud Feedback Model Intercomparison Project (COSP) package. Therefore, on-line simulations provided by EC-Earth model equipped with the new COSP + σ-IASI module have been performed in clear-sky conditions with prescribed sea surface temperature and sea-ice cover, every 6 hours, over a timeframe consistent with the availability of IASI data. Systematic comparisons between observed IASI MetOp-A L1C data and model outputs have been performed in 10 cm-1 spectral intervals, on global and regional scales, by distinguishing the surface type (land, sea). The long term analysis shows a warm bias of the climate model in the roto-vibrational water vapour bands and in the CO2 absorption band. These biases represent a strong evidence of a temperature bias of the model in the upper-troposphere and in the stratosphere, while a cold bias occurs over land. |
format |
Article in Journal/Newspaper |
author |
Della Fera, Stefano Fabiano, Federico Raspollini, Piera Ridolfi, Marco Cortesi, Ugo Barbara, Flavio von Hardenberg, Jost |
author_facet |
Della Fera, Stefano Fabiano, Federico Raspollini, Piera Ridolfi, Marco Cortesi, Ugo Barbara, Flavio von Hardenberg, Jost |
author_sort |
Della Fera, Stefano |
title |
On the use of IASI spectrally resolved radiances to test the EC-Earth climate model (v3.3.3) in clear-sky conditions |
title_short |
On the use of IASI spectrally resolved radiances to test the EC-Earth climate model (v3.3.3) in clear-sky conditions |
title_full |
On the use of IASI spectrally resolved radiances to test the EC-Earth climate model (v3.3.3) in clear-sky conditions |
title_fullStr |
On the use of IASI spectrally resolved radiances to test the EC-Earth climate model (v3.3.3) in clear-sky conditions |
title_full_unstemmed |
On the use of IASI spectrally resolved radiances to test the EC-Earth climate model (v3.3.3) in clear-sky conditions |
title_sort |
on the use of iasi spectrally resolved radiances to test the ec-earth climate model (v3.3.3) in clear-sky conditions |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-479 https://noa.gwlb.de/receive/cop_mods_00062088 https://egusphere.copernicus.org/preprints/egusphere-2022-479/egusphere-2022-479.pdf |
genre |
Sea ice Cris |
genre_facet |
Sea ice Cris |
op_relation |
https://doi.org/10.5194/egusphere-2022-479 https://noa.gwlb.de/receive/cop_mods_00062088 https://egusphere.copernicus.org/preprints/egusphere-2022-479/egusphere-2022-479.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/egusphere-2022-479 |
_version_ |
1766195587664838656 |