Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events

This study investigates the impact of wind-induced sea ice drift on sea ice cover over the Indian Ocean sector of the Southern Ocean (IOS) in the contrasting Southern Annular Mode (SAM) years during a summer (February) and a winter (July) month. Analysis of reanalysis wind shows that during positive...

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Published in:International Journal of Climatology
Main Authors: Deb, Pranab, Dash, Mihir Kumar, Dey, Subhra Prakash, Pandey, Prem Chand
Format: Article in Journal/Newspaper
Language:unknown
Published: Wiley 2017
Subjects:
Online Access:http://nora.nerc.ac.uk/id/eprint/513525/
https://doi.org/10.1002/joc.4730
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spelling ftnerc:oai:nora.nerc.ac.uk:513525 2023-05-15T13:49:32+02:00 Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events Deb, Pranab Dash, Mihir Kumar Dey, Subhra Prakash Pandey, Prem Chand 2017-02 http://nora.nerc.ac.uk/id/eprint/513525/ https://doi.org/10.1002/joc.4730 unknown Wiley Deb, Pranab; Dash, Mihir Kumar; Dey, Subhra Prakash; Pandey, Prem Chand. 2017 Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events. International Journal of Climatology, 37 (2). 648-656. https://doi.org/10.1002/joc.4730 <https://doi.org/10.1002/joc.4730> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1002/joc.4730 2023-02-04T19:42:59Z This study investigates the impact of wind-induced sea ice drift on sea ice cover over the Indian Ocean sector of the Southern Ocean (IOS) in the contrasting Southern Annular Mode (SAM) years during a summer (February) and a winter (July) month. Analysis of reanalysis wind shows that during positive SAM events, westerlies show stronger and more zonal flow over the west IOS (west of 45°E), while a stronger northerly component is seen over the east IOS, to the south of 55°S during both February and July. This is attributed to the zonally asymmetric feature of sea level pressure over the IOS. A coupled ocean–sea ice model was forced with dynamical wind forcing for positive and negative SAM events during above months. The zonal contrast as seen in wind and surface current is transferred to the sea ice drift. A stronger zonal eastward sea ice drift is apparent over the west IOS, suggesting increased transport of sea ice from the Weddell Sea region in July. The eastward advection of sea ice results in piling of sea ice over west IOS and causes an increase in sea ice concentration and thickness. Over east IOS, the sea ice drift shows a strong southeastward anomaly from the sea ice edge towards the coast. This results in a piling of sea ice near the coast and a divergence of sea ice near the edge. This results in a negative anomaly in sea ice concentration and sea ice thickness over east IOS. Thus, the dynamical SAM forcing leads to a non-annular response in sea ice cover over the IOS. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean The Antarctic Weddell Sea Indian Weddell International Journal of Climatology 37 2 648 656
institution Open Polar
collection Natural Environment Research Council: NERC Open Research Archive
op_collection_id ftnerc
language unknown
description This study investigates the impact of wind-induced sea ice drift on sea ice cover over the Indian Ocean sector of the Southern Ocean (IOS) in the contrasting Southern Annular Mode (SAM) years during a summer (February) and a winter (July) month. Analysis of reanalysis wind shows that during positive SAM events, westerlies show stronger and more zonal flow over the west IOS (west of 45°E), while a stronger northerly component is seen over the east IOS, to the south of 55°S during both February and July. This is attributed to the zonally asymmetric feature of sea level pressure over the IOS. A coupled ocean–sea ice model was forced with dynamical wind forcing for positive and negative SAM events during above months. The zonal contrast as seen in wind and surface current is transferred to the sea ice drift. A stronger zonal eastward sea ice drift is apparent over the west IOS, suggesting increased transport of sea ice from the Weddell Sea region in July. The eastward advection of sea ice results in piling of sea ice over west IOS and causes an increase in sea ice concentration and thickness. Over east IOS, the sea ice drift shows a strong southeastward anomaly from the sea ice edge towards the coast. This results in a piling of sea ice near the coast and a divergence of sea ice near the edge. This results in a negative anomaly in sea ice concentration and sea ice thickness over east IOS. Thus, the dynamical SAM forcing leads to a non-annular response in sea ice cover over the IOS.
format Article in Journal/Newspaper
author Deb, Pranab
Dash, Mihir Kumar
Dey, Subhra Prakash
Pandey, Prem Chand
spellingShingle Deb, Pranab
Dash, Mihir Kumar
Dey, Subhra Prakash
Pandey, Prem Chand
Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events
author_facet Deb, Pranab
Dash, Mihir Kumar
Dey, Subhra Prakash
Pandey, Prem Chand
author_sort Deb, Pranab
title Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events
title_short Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events
title_full Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events
title_fullStr Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events
title_full_unstemmed Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events
title_sort non-annular response of sea ice cover in the indian sector of the antarctic during extreme sam events
publisher Wiley
publishDate 2017
url http://nora.nerc.ac.uk/id/eprint/513525/
https://doi.org/10.1002/joc.4730
geographic Antarctic
Southern Ocean
The Antarctic
Weddell Sea
Indian
Weddell
geographic_facet Antarctic
Southern Ocean
The Antarctic
Weddell Sea
Indian
Weddell
genre Antarc*
Antarctic
Sea ice
Southern Ocean
Weddell Sea
genre_facet Antarc*
Antarctic
Sea ice
Southern Ocean
Weddell Sea
op_relation Deb, Pranab; Dash, Mihir Kumar; Dey, Subhra Prakash; Pandey, Prem Chand. 2017 Non-annular response of sea ice cover in the Indian sector of the Antarctic during extreme SAM events. International Journal of Climatology, 37 (2). 648-656. https://doi.org/10.1002/joc.4730 <https://doi.org/10.1002/joc.4730>
op_doi https://doi.org/10.1002/joc.4730
container_title International Journal of Climatology
container_volume 37
container_issue 2
container_start_page 648
op_container_end_page 656
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