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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Published in:Journal of Climate
Main Author: Kusahara, K
Format: Article in Journal/Newspaper
Language:English
Published: Amer Meteorological Soc 2020
Subjects:
Earth Sciences
Oceanography
Physical oceanography
Antarctic
Southern Ocean
The Antarctic
Antarc*
Ice Shelf
Ice Shelves
Sea ice
Online Access:https://doi.org/10.1175/JCLI-D-19-0659.1
http://ecite.utas.edu.au/143659
id ftunivtasecite:oai:ecite.utas.edu.au:143659
record_format openpolar
spelling ftunivtasecite:oai:ecite.utas.edu.au:143659 2023-05-15T13:59:46+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://doi.org/10.1175/JCLI-D-19-0659.1 http://ecite.utas.edu.au/143659 en eng Amer Meteorological Soc http://ecite.utas.edu.au/143659/1/143659 - Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction.pdf http://dx.doi.org/10.1175/JCLI-D-19-0659.1 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, Journal of Climate, 33, (12) pp. 4941-4973. ISSN 0894-8755 (2020) [Refereed Article] http://ecite.utas.edu.au/143659 Earth Sciences Oceanography Physical oceanography Refereed Article PeerReviewed 2020 ftunivtasecite https://doi.org/10.1175/JCLI-D-19-0659.1 2021-11-01T23:17:54Z 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 eCite UTAS (University of Tasmania) Antarctic Southern Ocean The Antarctic Journal of Climate 33 12 4941 4973
institution Open Polar
collection eCite UTAS (University of Tasmania)
op_collection_id ftunivtasecite
language English
topic Earth Sciences
Oceanography
Physical oceanography
spellingShingle Earth Sciences
Oceanography
Physical oceanography
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 Earth Sciences
Oceanography
Physical oceanography
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://doi.org/10.1175/JCLI-D-19-0659.1
http://ecite.utas.edu.au/143659
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 http://ecite.utas.edu.au/143659/1/143659 - Interannual-to-multidecadal responses of Antarctic ice shelf-ocean interaction.pdf
http://dx.doi.org/10.1175/JCLI-D-19-0659.1
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, Journal of Climate, 33, (12) pp. 4941-4973. ISSN 0894-8755 (2020) [Refereed Article]
http://ecite.utas.edu.au/143659
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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