Pathways of ocean heat towards Pine Island and Thwaites grounding lines

Type Article
Date 2019-11
Language English
Author(s) Nakayama Yoshihiro1, 2, Manucharyan Georgy3, Zhang Hong1, Dutrieux Pierre4, Torres Hector S.1, Klein Patrice1, 5, Seroussi Helene1, Schodlok Michael1, Rignot Eric1, Menemenlis Dimitris1, 6
Affiliation(s) 1 : Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, USA
2 : Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan
3 : California Institute of Technology, Pasadena, CA, USA
4 : Lamont-Doherty Earth Observatory, Columbia University, NY, USA
5 : Laboratoire de Physique des Océans, IFREMER‐CNRS‐IRD‐UBO, Plouzané, France
6 : Earth System Science, University of California Irvine, CA, USA
Source Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2019-11 , Vol. 9 , N. 1 , P. 16649 (9p.)
DOI 10.1038/s41598-019-53190-6
WOS© Times Cited 23

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.

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Nakayama Yoshihiro, Manucharyan Georgy, Zhang Hong, Dutrieux Pierre, Torres Hector S., Klein Patrice, Seroussi Helene, Schodlok Michael, Rignot Eric, Menemenlis Dimitris (2019). Pathways of ocean heat towards Pine Island and Thwaites grounding lines. Scientific Reports, 9(1), 16649 (9p.). Publisher's official version : , Open Access version :