A comparison of the atmospheric response to the Weddell Sea Polynya in atmospheric general circulation models (AGCMs) of varying resolutions
The Weddell Sea Polynya (WSP) is a large opening within the sea ice cover of the Weddell Sea sector. It has been a rare event in the satellite period, appearing between 1973 and 1976 and again in 2016/2017. Coupled modelling studies have suggested that there may be a large-scale atmospheric response...
Published in: | Weather and Climate Dynamics |
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Copernicus Publications
2024
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00074125 2024-06-23T07:56:44+00:00 A comparison of the atmospheric response to the Weddell Sea Polynya in atmospheric general circulation models (AGCMs) of varying resolutions Ayres, Holly C. Ferreira, David Park, Wonsun Kjellsson, Joakim Ödalen, Malin 2024-06 electronic https://doi.org/10.5194/wcd-5-805-2024 https://noa.gwlb.de/receive/cop_mods_00074125 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00072255/wcd-5-805-2024.pdf https://wcd.copernicus.org/articles/5/805/2024/wcd-5-805-2024.pdf eng eng Copernicus Publications Weather and Climate Dynamics -- https://www.weather-climate-dynamics.net/ -- 2698-4016 https://doi.org/10.5194/wcd-5-805-2024 https://noa.gwlb.de/receive/cop_mods_00074125 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00072255/wcd-5-805-2024.pdf https://wcd.copernicus.org/articles/5/805/2024/wcd-5-805-2024.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/wcd-5-805-2024 2024-06-10T23:38:39Z The Weddell Sea Polynya (WSP) is a large opening within the sea ice cover of the Weddell Sea sector. It has been a rare event in the satellite period, appearing between 1973 and 1976 and again in 2016/2017. Coupled modelling studies have suggested that there may be a large-scale atmospheric response to the WSP. Here, the direct atmospheric response to the WSP is estimated from atmosphere-only numerical experiments. Three different models, the HadGEM3 UK Met Office model, the ECHAM5 Max Planck Institute model, and the OpenIFS ECMWF model, each at two different resolutions, are used to test the robustness of our results. The use of large ensembles reduces the weather variability and isolates the atmospheric response. Results show a large (∼100–200 W m−2) turbulent air–sea flux anomaly above the polynya. The response to the WSP is local and of short duration (barely outlasting the WSP) with a similar magnitude and spatial pattern of lower-tropospheric warming and increase in precipitation in all six configurations. All models show a weak decrease in surface pressure over the WSP, but this response is small (∼2 hPa) in comparison to internal variability. The dynamic response is inconsistent between models and resolutions above the boundary layer, suggesting a weak or null response that is covered by internal variability aloft. The higher resolution does not alter the pattern of the response but increases its magnitude by up ∼50 % in two of the three models. The response is influenced by natural variability in the westerly jet. The models perform well against ERA5 reanalysis data for the 1974 WSP in spatial response and magnitude, showing a turbulent heat flux of approximately 150 W m−2. Article in Journal/Newspaper Sea ice Weddell Sea Niedersächsisches Online-Archiv NOA Weddell Weddell Sea Weather and Climate Dynamics 5 2 805 820 |
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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 Ayres, Holly C. Ferreira, David Park, Wonsun Kjellsson, Joakim Ödalen, Malin A comparison of the atmospheric response to the Weddell Sea Polynya in atmospheric general circulation models (AGCMs) of varying resolutions |
topic_facet |
article Verlagsveröffentlichung |
description |
The Weddell Sea Polynya (WSP) is a large opening within the sea ice cover of the Weddell Sea sector. It has been a rare event in the satellite period, appearing between 1973 and 1976 and again in 2016/2017. Coupled modelling studies have suggested that there may be a large-scale atmospheric response to the WSP. Here, the direct atmospheric response to the WSP is estimated from atmosphere-only numerical experiments. Three different models, the HadGEM3 UK Met Office model, the ECHAM5 Max Planck Institute model, and the OpenIFS ECMWF model, each at two different resolutions, are used to test the robustness of our results. The use of large ensembles reduces the weather variability and isolates the atmospheric response. Results show a large (∼100–200 W m−2) turbulent air–sea flux anomaly above the polynya. The response to the WSP is local and of short duration (barely outlasting the WSP) with a similar magnitude and spatial pattern of lower-tropospheric warming and increase in precipitation in all six configurations. All models show a weak decrease in surface pressure over the WSP, but this response is small (∼2 hPa) in comparison to internal variability. The dynamic response is inconsistent between models and resolutions above the boundary layer, suggesting a weak or null response that is covered by internal variability aloft. The higher resolution does not alter the pattern of the response but increases its magnitude by up ∼50 % in two of the three models. The response is influenced by natural variability in the westerly jet. The models perform well against ERA5 reanalysis data for the 1974 WSP in spatial response and magnitude, showing a turbulent heat flux of approximately 150 W m−2. |
format |
Article in Journal/Newspaper |
author |
Ayres, Holly C. Ferreira, David Park, Wonsun Kjellsson, Joakim Ödalen, Malin |
author_facet |
Ayres, Holly C. Ferreira, David Park, Wonsun Kjellsson, Joakim Ödalen, Malin |
author_sort |
Ayres, Holly C. |
title |
A comparison of the atmospheric response to the Weddell Sea Polynya in atmospheric general circulation models (AGCMs) of varying resolutions |
title_short |
A comparison of the atmospheric response to the Weddell Sea Polynya in atmospheric general circulation models (AGCMs) of varying resolutions |
title_full |
A comparison of the atmospheric response to the Weddell Sea Polynya in atmospheric general circulation models (AGCMs) of varying resolutions |
title_fullStr |
A comparison of the atmospheric response to the Weddell Sea Polynya in atmospheric general circulation models (AGCMs) of varying resolutions |
title_full_unstemmed |
A comparison of the atmospheric response to the Weddell Sea Polynya in atmospheric general circulation models (AGCMs) of varying resolutions |
title_sort |
comparison of the atmospheric response to the weddell sea polynya in atmospheric general circulation models (agcms) of varying resolutions |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/wcd-5-805-2024 https://noa.gwlb.de/receive/cop_mods_00074125 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00072255/wcd-5-805-2024.pdf https://wcd.copernicus.org/articles/5/805/2024/wcd-5-805-2024.pdf |
geographic |
Weddell Weddell Sea |
geographic_facet |
Weddell Weddell Sea |
genre |
Sea ice Weddell Sea |
genre_facet |
Sea ice Weddell Sea |
op_relation |
Weather and Climate Dynamics -- https://www.weather-climate-dynamics.net/ -- 2698-4016 https://doi.org/10.5194/wcd-5-805-2024 https://noa.gwlb.de/receive/cop_mods_00074125 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00072255/wcd-5-805-2024.pdf https://wcd.copernicus.org/articles/5/805/2024/wcd-5-805-2024.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/wcd-5-805-2024 |
container_title |
Weather and Climate Dynamics |
container_volume |
5 |
container_issue |
2 |
container_start_page |
805 |
op_container_end_page |
820 |
_version_ |
1802650031657844736 |