Evaluation of downward and upward solar irradiances simulated by the Integrated Forecasting System of ECMWF using airborne observations above Arctic low-level clouds
The simulations of upward and downward irradiances by the Integrated Forecasting System (IFS) of the European Centre for Medium-Range Weather Forecasts are compared to broadband solar irradiance measurements from the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) cam...
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2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00069821 2023-12-10T09:39:12+01:00 Evaluation of downward and upward solar irradiances simulated by the Integrated Forecasting System of ECMWF using airborne observations above Arctic low-level clouds Müller, Hanno Ehrlich, André Jäkel, Evelyn Röttenbacher, Johannes Kirbus, Benjamin Schäfer, Michael Hogan, Robin J. Wendisch, Manfred 2023-11 electronic https://doi.org/10.5194/egusphere-2023-2443 https://noa.gwlb.de/receive/cop_mods_00069821 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068192/egusphere-2023-2443.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2443/egusphere-2023-2443.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-2443 https://noa.gwlb.de/receive/cop_mods_00069821 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068192/egusphere-2023-2443.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2443/egusphere-2023-2443.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/egusphere-2023-2443 2023-11-13T00:22:45Z The simulations of upward and downward irradiances by the Integrated Forecasting System (IFS) of the European Centre for Medium-Range Weather Forecasts are compared to broadband solar irradiance measurements from the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign. For this purpose, offline radiative transfer simulations with the ecRad radiation scheme using the operational IFS output were performed. The simulations of the downward solar irradiance agree within the measurement uncertainty. However, the IFS underestimates the reflected solar irradiances above sea ice significantly by −35 Wm−2. Above open ocean, the agreement is closer with an overestimation of 29 Wm−2. A sensitivity study using measured surface and cloud properties is performed with ecRad to quantify the contributions of the surface albedo, cloud fraction, ice and liquid water path and cloud droplet number concentration to the observed bias. It shows that the IFS sea ice albedo climatology underestimates the observed sea ice albedo, causing more than 50 % of the bias. Considering the higher variability of in situ observations in the parameterization of the cloud droplet number concentration leads to a smaller bias of −27 Wm−2 above sea ice and a larger bias of 48 Wm−2 above open ocean by increasing the range from 36–69 cm−3 to 36–200 cm−3. Above sea ice, realistic surface albedos, cloud droplet number concentrations and liquid water paths contribute most to a bias improvement. Above open ocean, realistic cloud fractions and liquid water paths are most important to reduce the model-observation differences. Article in Journal/Newspaper albedo Arctic Sea ice Niedersächsisches Online-Archiv NOA Arctic |
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Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Müller, Hanno Ehrlich, André Jäkel, Evelyn Röttenbacher, Johannes Kirbus, Benjamin Schäfer, Michael Hogan, Robin J. Wendisch, Manfred Evaluation of downward and upward solar irradiances simulated by the Integrated Forecasting System of ECMWF using airborne observations above Arctic low-level clouds |
topic_facet |
article Verlagsveröffentlichung |
description |
The simulations of upward and downward irradiances by the Integrated Forecasting System (IFS) of the European Centre for Medium-Range Weather Forecasts are compared to broadband solar irradiance measurements from the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign. For this purpose, offline radiative transfer simulations with the ecRad radiation scheme using the operational IFS output were performed. The simulations of the downward solar irradiance agree within the measurement uncertainty. However, the IFS underestimates the reflected solar irradiances above sea ice significantly by −35 Wm−2. Above open ocean, the agreement is closer with an overestimation of 29 Wm−2. A sensitivity study using measured surface and cloud properties is performed with ecRad to quantify the contributions of the surface albedo, cloud fraction, ice and liquid water path and cloud droplet number concentration to the observed bias. It shows that the IFS sea ice albedo climatology underestimates the observed sea ice albedo, causing more than 50 % of the bias. Considering the higher variability of in situ observations in the parameterization of the cloud droplet number concentration leads to a smaller bias of −27 Wm−2 above sea ice and a larger bias of 48 Wm−2 above open ocean by increasing the range from 36–69 cm−3 to 36–200 cm−3. Above sea ice, realistic surface albedos, cloud droplet number concentrations and liquid water paths contribute most to a bias improvement. Above open ocean, realistic cloud fractions and liquid water paths are most important to reduce the model-observation differences. |
format |
Article in Journal/Newspaper |
author |
Müller, Hanno Ehrlich, André Jäkel, Evelyn Röttenbacher, Johannes Kirbus, Benjamin Schäfer, Michael Hogan, Robin J. Wendisch, Manfred |
author_facet |
Müller, Hanno Ehrlich, André Jäkel, Evelyn Röttenbacher, Johannes Kirbus, Benjamin Schäfer, Michael Hogan, Robin J. Wendisch, Manfred |
author_sort |
Müller, Hanno |
title |
Evaluation of downward and upward solar irradiances simulated by the Integrated Forecasting System of ECMWF using airborne observations above Arctic low-level clouds |
title_short |
Evaluation of downward and upward solar irradiances simulated by the Integrated Forecasting System of ECMWF using airborne observations above Arctic low-level clouds |
title_full |
Evaluation of downward and upward solar irradiances simulated by the Integrated Forecasting System of ECMWF using airborne observations above Arctic low-level clouds |
title_fullStr |
Evaluation of downward and upward solar irradiances simulated by the Integrated Forecasting System of ECMWF using airborne observations above Arctic low-level clouds |
title_full_unstemmed |
Evaluation of downward and upward solar irradiances simulated by the Integrated Forecasting System of ECMWF using airborne observations above Arctic low-level clouds |
title_sort |
evaluation of downward and upward solar irradiances simulated by the integrated forecasting system of ecmwf using airborne observations above arctic low-level clouds |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-2443 https://noa.gwlb.de/receive/cop_mods_00069821 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068192/egusphere-2023-2443.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2443/egusphere-2023-2443.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic Sea ice |
genre_facet |
albedo Arctic Sea ice |
op_relation |
https://doi.org/10.5194/egusphere-2023-2443 https://noa.gwlb.de/receive/cop_mods_00069821 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068192/egusphere-2023-2443.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2443/egusphere-2023-2443.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2023-2443 |
_version_ |
1784902539809914880 |