A comparison of the atmospheric response to the Weddell Sea Polynya in 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 2016/17. Some studies have suggested that there may be a large-scale atmospheric response to the WSP. H...
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Copernicus Publications
2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00068680 2023-10-09T21:55:53+02:00 A comparison of the atmospheric response to the Weddell Sea Polynya in AGCMs of varying resolutions Ayres, Holly Cara Ferreira, David Park, Wonsun Kjellson, Joakim Ödalen, Malin 2023-09 electronic https://doi.org/10.5194/egusphere-2023-1982 https://noa.gwlb.de/receive/cop_mods_00068680 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067099/egusphere-2023-1982.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1982/egusphere-2023-1982.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-1982 https://noa.gwlb.de/receive/cop_mods_00068680 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067099/egusphere-2023-1982.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1982/egusphere-2023-1982.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-2023-1982 2023-09-10T23:21:45Z 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 2016/17. Some studies have suggested that there may be a large-scale atmospheric response to the WSP. Here, we use high and low-resolution atmosphere-only experiments with the HadGEM3 UK Met Office model, the ECHAM5 Max Planck Institute model and the OpenIFS ECMWF model, to isolate the atmospheric response to the WSP. Results show a large (~100–200 Wm-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 6 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, notably above the boundary layer, suggesting a weak or null response that is covered by internal variability aloft. The high resolution does 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 variabilty of 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 Wm-2. Article in Journal/Newspaper Sea ice Weddell Sea Niedersächsisches Online-Archiv NOA Weddell Sea Weddell |
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Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Ayres, Holly Cara Ferreira, David Park, Wonsun Kjellson, Joakim Ödalen, Malin A comparison of the atmospheric response to the Weddell Sea Polynya in 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 2016/17. Some studies have suggested that there may be a large-scale atmospheric response to the WSP. Here, we use high and low-resolution atmosphere-only experiments with the HadGEM3 UK Met Office model, the ECHAM5 Max Planck Institute model and the OpenIFS ECMWF model, to isolate the atmospheric response to the WSP. Results show a large (~100–200 Wm-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 6 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, notably above the boundary layer, suggesting a weak or null response that is covered by internal variability aloft. The high resolution does 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 variabilty of 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 Wm-2. |
format |
Article in Journal/Newspaper |
author |
Ayres, Holly Cara Ferreira, David Park, Wonsun Kjellson, Joakim Ödalen, Malin |
author_facet |
Ayres, Holly Cara Ferreira, David Park, Wonsun Kjellson, Joakim Ödalen, Malin |
author_sort |
Ayres, Holly Cara |
title |
A comparison of the atmospheric response to the Weddell Sea Polynya in AGCMs of varying resolutions |
title_short |
A comparison of the atmospheric response to the Weddell Sea Polynya in AGCMs of varying resolutions |
title_full |
A comparison of the atmospheric response to the Weddell Sea Polynya in AGCMs of varying resolutions |
title_fullStr |
A comparison of the atmospheric response to the Weddell Sea Polynya in AGCMs of varying resolutions |
title_full_unstemmed |
A comparison of the atmospheric response to the Weddell Sea Polynya in AGCMs of varying resolutions |
title_sort |
comparison of the atmospheric response to the weddell sea polynya in agcms of varying resolutions |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-1982 https://noa.gwlb.de/receive/cop_mods_00068680 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067099/egusphere-2023-1982.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1982/egusphere-2023-1982.pdf |
geographic |
Weddell Sea Weddell |
geographic_facet |
Weddell Sea Weddell |
genre |
Sea ice Weddell Sea |
genre_facet |
Sea ice Weddell Sea |
op_relation |
https://doi.org/10.5194/egusphere-2023-1982 https://noa.gwlb.de/receive/cop_mods_00068680 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067099/egusphere-2023-1982.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1982/egusphere-2023-1982.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2023-1982 |
_version_ |
1779320097185202176 |