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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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