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Pathways of ocean heat towards Pine Island and Thwaites grounding lines

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Title: Pathways of ocean heat towards Pine Island and Thwaites grounding lines
Authors: Nakayama, Yoshihiro Browse this author
Manucharyan, Georgy Browse this author
Zhang, Hong Browse this author
Dutrieux, Pierre Browse this author
Torres, Hector S. Browse this author
Klein, Patrice Browse this author
Seroussi, Helene Browse this author
Schodlok, Michael Browse this author
Rignot, Eric Browse this author
Menemenlis, Dimitris Browse this author
Issue Date: 22-Nov-2019
Publisher: Nature Publishing Group
Journal Title: Scientific reports
Volume: 9
Start Page: 16649
Publisher DOI: 10.1038/s41598-019-53190-6
Abstract: 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 degrees W and 74.3 degrees 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.
Rights: https://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/76431
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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