Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing

Much attention has been paid to ocean-cryosphere interactions over the Southern Ocean. Basal melting of Antarctic ice shelves has been reported to be the primary ablation process for the Antarctic ice sheets. Warm waters on the continental shelf, such as Circumpolar Deep Water (CDW) and Antarctic Su...

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Bibliographic Details
Published in:Journal of Climate
Main Author: Kusahara, K
Format: Article in Journal/Newspaper
Language:English
Published: Amer Meteorological Soc 2020
Subjects:
ocean
ice shelves
Southern Ocean
water masses/storage
interannual variability
trends
Antarctic
The Antarctic
Antarc*
Ice Shelf
Ice Shelves
Sea ice
Online Access:https://eprints.utas.edu.au/38127/
https://eprints.utas.edu.au/38127/1/143659%20-%20Interannual-to-multidecadal%20responses%20of%20Antarctic%20ice%20shelf-ocean%20interaction.pdf
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record_format openpolar
spelling ftunivtasmania:oai:eprints.utas.edu.au:38127 2023-05-15T13:42:39+02:00 Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing Kusahara, K 2020 application/pdf https://eprints.utas.edu.au/38127/ https://eprints.utas.edu.au/38127/1/143659%20-%20Interannual-to-multidecadal%20responses%20of%20Antarctic%20ice%20shelf-ocean%20interaction.pdf en eng Amer Meteorological Soc https://eprints.utas.edu.au/38127/1/143659%20-%20Interannual-to-multidecadal%20responses%20of%20Antarctic%20ice%20shelf-ocean%20interaction.pdf Kusahara, K orcid:0000-0003-4067-7959 2020 , 'Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing' , Journal of Climate, vol. 33, no. 12 , pp. 4941-4973 , doi:10.1175/JCLI-D-19-0659.1 <http://dx.doi.org/10.1175/JCLI-D-19-0659.1>. ocean ice shelves Southern Ocean water masses/storage interannual variability trends Article PeerReviewed 2020 ftunivtasmania https://doi.org/10.1175/JCLI-D-19-0659.1 2021-11-01T23:17:55Z Much attention has been paid to ocean-cryosphere interactions over the Southern Ocean. Basal melting of Antarctic ice shelves has been reported to be the primary ablation process for the Antarctic ice sheets. Warm waters on the continental shelf, such as Circumpolar Deep Water (CDW) and Antarctic Surface Water (AASW), play a critical role in active ice shelf basal melting. However, the temporal evolution and mechanisms of the basal melting and warm water intrusions throughout the twentieth century and the early twenty-first century have not been rigorously examined and are not fully understood. Here, we conduct a numerical experiment of an ocean-sea ice-ice shelf model forced with a century-long atmospheric reanalysis for the period 1900-2010. To begin with, we provide an assessment of the atmospheric conditions by comparing with available observation and show biases in warming and stronger westerly trends. Taking into account the limitation, we examine the interannual-to-multidecadal variability in the Antarctic ice shelf basal melting and the role of coastal water masses. A series of numerical experiments demonstrate that wind stress changes over the Southern Ocean drive enhanced poleward heat transport by stronger subpolar gyres and reduce coastal sea ice and cold-water formations, both of which result in an increased ocean heat flux into Antarctic ice shelf cavities. Furthermore, an increase of sea ice-free days leads to enhanced regional AASW contribution to the basal melting. This study demonstrates that changes in Antarctic coastal water masses are key metrics for better understanding of the ocean-cryosphere interaction over the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean The Antarctic Journal of Climate 33 12 4941 4973
institution Open Polar
collection University of Tasmania: UTas ePrints
op_collection_id ftunivtasmania
language English
topic ocean
ice shelves
Southern Ocean
water masses/storage
interannual variability
trends
spellingShingle ocean
ice shelves
Southern Ocean
water masses/storage
interannual variability
trends
Kusahara, K
Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing
topic_facet ocean
ice shelves
Southern Ocean
water masses/storage
interannual variability
trends
description Much attention has been paid to ocean-cryosphere interactions over the Southern Ocean. Basal melting of Antarctic ice shelves has been reported to be the primary ablation process for the Antarctic ice sheets. Warm waters on the continental shelf, such as Circumpolar Deep Water (CDW) and Antarctic Surface Water (AASW), play a critical role in active ice shelf basal melting. However, the temporal evolution and mechanisms of the basal melting and warm water intrusions throughout the twentieth century and the early twenty-first century have not been rigorously examined and are not fully understood. Here, we conduct a numerical experiment of an ocean-sea ice-ice shelf model forced with a century-long atmospheric reanalysis for the period 1900-2010. To begin with, we provide an assessment of the atmospheric conditions by comparing with available observation and show biases in warming and stronger westerly trends. Taking into account the limitation, we examine the interannual-to-multidecadal variability in the Antarctic ice shelf basal melting and the role of coastal water masses. A series of numerical experiments demonstrate that wind stress changes over the Southern Ocean drive enhanced poleward heat transport by stronger subpolar gyres and reduce coastal sea ice and cold-water formations, both of which result in an increased ocean heat flux into Antarctic ice shelf cavities. Furthermore, an increase of sea ice-free days leads to enhanced regional AASW contribution to the basal melting. This study demonstrates that changes in Antarctic coastal water masses are key metrics for better understanding of the ocean-cryosphere interaction over the Southern Ocean.
format Article in Journal/Newspaper
author Kusahara, K
author_facet Kusahara, K
author_sort Kusahara, K
title Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing
title_short Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing
title_full Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing
title_fullStr Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing
title_full_unstemmed Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing
title_sort interannual-to-multidecadal responses of antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing
publisher Amer Meteorological Soc
publishDate 2020
url https://eprints.utas.edu.au/38127/
https://eprints.utas.edu.au/38127/1/143659%20-%20Interannual-to-multidecadal%20responses%20of%20Antarctic%20ice%20shelf-ocean%20interaction.pdf
geographic Antarctic
Southern Ocean
The Antarctic
geographic_facet Antarctic
Southern Ocean
The Antarctic
genre Antarc*
Antarctic
Ice Shelf
Ice Shelves
Sea ice
Southern Ocean
genre_facet Antarc*
Antarctic
Ice Shelf
Ice Shelves
Sea ice
Southern Ocean
op_relation https://eprints.utas.edu.au/38127/1/143659%20-%20Interannual-to-multidecadal%20responses%20of%20Antarctic%20ice%20shelf-ocean%20interaction.pdf
Kusahara, K orcid:0000-0003-4067-7959 2020 , 'Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction and coastal water masses during the twentieth century and the early twenty-first century to dynamic and thermodynamic forcing' , Journal of Climate, vol. 33, no. 12 , pp. 4941-4973 , doi:10.1175/JCLI-D-19-0659.1 <http://dx.doi.org/10.1175/JCLI-D-19-0659.1>.
op_doi https://doi.org/10.1175/JCLI-D-19-0659.1
container_title Journal of Climate
container_volume 33
container_issue 12
container_start_page 4941
op_container_end_page 4973
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