Pathways of ocean heat towards Pine Island and Thwaites grounding lines
In the Amundsen Sea, modified Circumpolar Deep Water (mCDW) intrudes into ice shelf cavities, causing high ice shelf melting near the ice sheet grounding lines, accelerating ice flow, and controlling the pace of future Antarctic contributions to global sea level. The pathways of mCDW towards groundi...
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ftarchimer:oai:archimer.ifremer.fr:70560 2023-05-15T13:24:05+02:00 Pathways of ocean heat towards Pine Island and Thwaites grounding lines Nakayama, Yoshihiro Manucharyan, Georgy Zhang, Hong Dutrieux, Pierre Torres, Hector S. Klein, Patrice Seroussi, Helene Schodlok, Michael Rignot, Eric Menemenlis, Dimitris 2019-11 application/pdf https://archimer.ifremer.fr/doc/00593/70560/68742.pdf https://archimer.ifremer.fr/doc/00593/70560/68743.pdf https://doi.org/10.1038/s41598-019-53190-6 https://archimer.ifremer.fr/doc/00593/70560/ eng eng Springer Science and Business Media LLC https://archimer.ifremer.fr/doc/00593/70560/68742.pdf https://archimer.ifremer.fr/doc/00593/70560/68743.pdf doi:10.1038/s41598-019-53190-6 https://archimer.ifremer.fr/doc/00593/70560/ info:eu-repo/semantics/openAccess restricted use Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2019-11 , Vol. 9 , N. 1 , P. 16649 (9p.) text Publication info:eu-repo/semantics/article 2019 ftarchimer https://doi.org/10.1038/s41598-019-53190-6 2021-09-23T20:33:54Z In the Amundsen Sea, modified Circumpolar Deep Water (mCDW) intrudes into ice shelf cavities, causing high ice shelf melting near the ice sheet grounding lines, accelerating ice flow, and controlling the pace of future Antarctic contributions to global sea level. The pathways of mCDW towards grounding lines are crucial as they directly control the heat reaching the ice. A realistic representation of mCDW circulation, however, remains challenging due to the sparsity of in-situ observations and the difficulty of ocean models to reproduce the available observations. In this study, we use an unprecedentedly high-resolution (200 m horizontal and 10 m vertical grid spacing) ocean model that resolves shelf-sea and sub-ice-shelf environments in qualitative agreement with existing observations during austral summer conditions. We demonstrate that the waters reaching the Pine Island and Thwaites grounding lines follow specific, topographically-constrained routes, all passing through a relatively small area located around 104°W and 74.3°S. The temporal and spatial variabilities of ice shelf melt rates are dominantly controlled by the sub-ice shelf ocean current. Our findings highlight the importance of accurate and high-resolution ocean bathymetry and subglacial topography for determining mCDW pathways and ice shelf melt rates. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Amundsen Sea Antarctic Austral Scientific Reports 9 1 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
In the Amundsen Sea, modified Circumpolar Deep Water (mCDW) intrudes into ice shelf cavities, causing high ice shelf melting near the ice sheet grounding lines, accelerating ice flow, and controlling the pace of future Antarctic contributions to global sea level. The pathways of mCDW towards grounding lines are crucial as they directly control the heat reaching the ice. A realistic representation of mCDW circulation, however, remains challenging due to the sparsity of in-situ observations and the difficulty of ocean models to reproduce the available observations. In this study, we use an unprecedentedly high-resolution (200 m horizontal and 10 m vertical grid spacing) ocean model that resolves shelf-sea and sub-ice-shelf environments in qualitative agreement with existing observations during austral summer conditions. We demonstrate that the waters reaching the Pine Island and Thwaites grounding lines follow specific, topographically-constrained routes, all passing through a relatively small area located around 104°W and 74.3°S. The temporal and spatial variabilities of ice shelf melt rates are dominantly controlled by the sub-ice shelf ocean current. Our findings highlight the importance of accurate and high-resolution ocean bathymetry and subglacial topography for determining mCDW pathways and ice shelf melt rates. |
format |
Article in Journal/Newspaper |
author |
Nakayama, Yoshihiro Manucharyan, Georgy Zhang, Hong Dutrieux, Pierre Torres, Hector S. Klein, Patrice Seroussi, Helene Schodlok, Michael Rignot, Eric Menemenlis, Dimitris |
spellingShingle |
Nakayama, Yoshihiro Manucharyan, Georgy Zhang, Hong Dutrieux, Pierre Torres, Hector S. Klein, Patrice Seroussi, Helene Schodlok, Michael Rignot, Eric Menemenlis, Dimitris Pathways of ocean heat towards Pine Island and Thwaites grounding lines |
author_facet |
Nakayama, Yoshihiro Manucharyan, Georgy Zhang, Hong Dutrieux, Pierre Torres, Hector S. Klein, Patrice Seroussi, Helene Schodlok, Michael Rignot, Eric Menemenlis, Dimitris |
author_sort |
Nakayama, Yoshihiro |
title |
Pathways of ocean heat towards Pine Island and Thwaites grounding lines |
title_short |
Pathways of ocean heat towards Pine Island and Thwaites grounding lines |
title_full |
Pathways of ocean heat towards Pine Island and Thwaites grounding lines |
title_fullStr |
Pathways of ocean heat towards Pine Island and Thwaites grounding lines |
title_full_unstemmed |
Pathways of ocean heat towards Pine Island and Thwaites grounding lines |
title_sort |
pathways of ocean heat towards pine island and thwaites grounding lines |
publisher |
Springer Science and Business Media LLC |
publishDate |
2019 |
url |
https://archimer.ifremer.fr/doc/00593/70560/68742.pdf https://archimer.ifremer.fr/doc/00593/70560/68743.pdf https://doi.org/10.1038/s41598-019-53190-6 https://archimer.ifremer.fr/doc/00593/70560/ |
geographic |
Amundsen Sea Antarctic Austral |
geographic_facet |
Amundsen Sea Antarctic Austral |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Ice Shelf |
op_source |
Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2019-11 , Vol. 9 , N. 1 , P. 16649 (9p.) |
op_relation |
https://archimer.ifremer.fr/doc/00593/70560/68742.pdf https://archimer.ifremer.fr/doc/00593/70560/68743.pdf doi:10.1038/s41598-019-53190-6 https://archimer.ifremer.fr/doc/00593/70560/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1038/s41598-019-53190-6 |
container_title |
Scientific Reports |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766377314262712320 |