The response of sea ice and high-salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations
Coastal polynyas in the Ross Sea are important source regions of high-salinity shelf water (HSSW) – the precursor of Antarctic Bottom Water that supplies the lower limb of the thermohaline circulation. Here, the response of sea ice production and HSSW formation to synoptic-scale and mesoscale cyclon...
Published in: | The Cryosphere |
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Online Access: | https://doi.org/10.5194/tc-17-1107-2023 https://tc.copernicus.org/articles/17/1107/2023/ |
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ftcopernicus:oai:publications.copernicus.org:tc105578 2023-05-15T13:46:32+02:00 The response of sea ice and high-salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations Wang, Xiaoqiao Zhang, Zhaoru Dinniman, Michael S. Uotila, Petteri Li, Xichen Zhou, Meng 2023-03-06 application/pdf https://doi.org/10.5194/tc-17-1107-2023 https://tc.copernicus.org/articles/17/1107/2023/ eng eng doi:10.5194/tc-17-1107-2023 https://tc.copernicus.org/articles/17/1107/2023/ eISSN: 1994-0424 Text 2023 ftcopernicus https://doi.org/10.5194/tc-17-1107-2023 2023-03-13T17:23:11Z Coastal polynyas in the Ross Sea are important source regions of high-salinity shelf water (HSSW) – the precursor of Antarctic Bottom Water that supplies the lower limb of the thermohaline circulation. Here, the response of sea ice production and HSSW formation to synoptic-scale and mesoscale cyclones was investigated for the Ross Ice Shelf Polynya (RISP) using a coupled ocean–sea ice–ice shelf model targeted on the Ross Sea. When synoptic-scale cyclones prevailed over RISP, sea ice production (SIP) increased rapidly by 20 %–30 % over the entire RISP. During the passage of mesoscale cyclones, SIP increased by about 2 times over the western RISP but decreased over the eastern RISP, resulting respectively from enhancement in the offshore and onshore winds. HSSW formation mainly occurred in the western RISP and was enhanced responding to the SIP increase under both types of cyclones. Promoted HSSW formation could persist for 12–60 h after the decay of the cyclones. The HSSW exports across the Drygalski Trough and the Glomar Challenger Trough were positively correlated with the meridional wind. Such correlations are mainly controlled by variations in geostrophic ocean currents that result from sea surface elevation change and density differences. Text Antarc* Antarctic Ice Shelf Ross Ice Shelf Ross Sea Sea ice Copernicus Publications: E-Journals Antarctic Drygalski ENVELOPE(-61.000,-61.000,-64.717,-64.717) Ross Ice Shelf Ross Sea The Cryosphere 17 3 1107 1126 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Coastal polynyas in the Ross Sea are important source regions of high-salinity shelf water (HSSW) – the precursor of Antarctic Bottom Water that supplies the lower limb of the thermohaline circulation. Here, the response of sea ice production and HSSW formation to synoptic-scale and mesoscale cyclones was investigated for the Ross Ice Shelf Polynya (RISP) using a coupled ocean–sea ice–ice shelf model targeted on the Ross Sea. When synoptic-scale cyclones prevailed over RISP, sea ice production (SIP) increased rapidly by 20 %–30 % over the entire RISP. During the passage of mesoscale cyclones, SIP increased by about 2 times over the western RISP but decreased over the eastern RISP, resulting respectively from enhancement in the offshore and onshore winds. HSSW formation mainly occurred in the western RISP and was enhanced responding to the SIP increase under both types of cyclones. Promoted HSSW formation could persist for 12–60 h after the decay of the cyclones. The HSSW exports across the Drygalski Trough and the Glomar Challenger Trough were positively correlated with the meridional wind. Such correlations are mainly controlled by variations in geostrophic ocean currents that result from sea surface elevation change and density differences. |
format |
Text |
author |
Wang, Xiaoqiao Zhang, Zhaoru Dinniman, Michael S. Uotila, Petteri Li, Xichen Zhou, Meng |
spellingShingle |
Wang, Xiaoqiao Zhang, Zhaoru Dinniman, Michael S. Uotila, Petteri Li, Xichen Zhou, Meng The response of sea ice and high-salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations |
author_facet |
Wang, Xiaoqiao Zhang, Zhaoru Dinniman, Michael S. Uotila, Petteri Li, Xichen Zhou, Meng |
author_sort |
Wang, Xiaoqiao |
title |
The response of sea ice and high-salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations |
title_short |
The response of sea ice and high-salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations |
title_full |
The response of sea ice and high-salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations |
title_fullStr |
The response of sea ice and high-salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations |
title_full_unstemmed |
The response of sea ice and high-salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations |
title_sort |
response of sea ice and high-salinity shelf water in the ross ice shelf polynya to cyclonic atmosphere circulations |
publishDate |
2023 |
url |
https://doi.org/10.5194/tc-17-1107-2023 https://tc.copernicus.org/articles/17/1107/2023/ |
long_lat |
ENVELOPE(-61.000,-61.000,-64.717,-64.717) |
geographic |
Antarctic Drygalski Ross Ice Shelf Ross Sea |
geographic_facet |
Antarctic Drygalski Ross Ice Shelf Ross Sea |
genre |
Antarc* Antarctic Ice Shelf Ross Ice Shelf Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Ice Shelf Ross Ice Shelf Ross Sea Sea ice |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-17-1107-2023 https://tc.copernicus.org/articles/17/1107/2023/ |
op_doi |
https://doi.org/10.5194/tc-17-1107-2023 |
container_title |
The Cryosphere |
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17 |
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3 |
container_start_page |
1107 |
op_container_end_page |
1126 |
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1766243883929305088 |