Ryder Glacier in northwest Greenland is shielded from warm Atlantic water by a bathymetric sill
| Autor: | John W. Farrell, Elizabeth Weidner, Björn Eriksson, Abhay Prakash, Lee-Gray Boze, Emelie Ståhl, Anna Glueder, Laura Gemery, Brett F. Thornton, Adam Ulfsbo, Julia Muchowski, Johan Nilsson, Felicity A. Holmes, Gabriel West, Sam Reed, Volker Brüchert, Thomas M. Cronin, Kevin Jerram, Brian R. Calder, Brendan T Reilly, Christian Stranne, Jonas Fredriksson, Matt O'Regan, Larry A. Mayer, Julek Chawarski, Tamara Handl, Alan C. Mix, Martin Jakobsson, Nina Kirchner, Henning Åkesson, June Padman |
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| Rok vydání: | 2020 |
| Předmět: |
geography
geography.geographical_feature_category Greenland ice sheet Glacier Fjord 02 engineering and technology Inflow 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Oceanography Sill General Earth and Planetary Sciences Bathymetry 0210 nano-technology Subsurface flow Atlantic water Geology General Environmental Science |
| Zdroj: | Communications Earth & Environment. 1 |
| ISSN: | 2662-4435 |
| Popis: | The processes controlling advance and retreat of outlet glaciers in fjords draining the Greenland Ice Sheet remain poorly known, undermining assessments of their dynamics and associated sea-level rise in a warming climate. Mass loss of the Greenland Ice Sheet has increased six-fold over the last four decades, with discharge and melt from outlet glaciers comprising key components of this loss. Here we acquired oceanographic data and multibeam bathymetry in the previously uncharted Sherard Osborn Fjord in northwest Greenland where Ryder Glacier drains into the Arctic Ocean. Our data show that warmer subsurface water of Atlantic origin enters the fjord, but Ryder Glacier’s floating tongue at its present location is partly protected from the inflow by a bathymetric sill located in the innermost fjord. This reduces under-ice melting of the glacier, providing insight into Ryder Glacier’s dynamics and its vulnerability to inflow of Atlantic warmer water. A bathymetric sill in Sherard Osborn Fjord, northwest Greenland shields Ryder Glacier from melting by warm Atlantic water found at the bottom of the fjord, according to high-resolution bathymetric mapping and oceanographic data. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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