Calving rates at tidewater glaciers vary strongly with ocean temperature

TerraSAR-X data were provided by DLR (project OCE1503), and funded by the Conoco Phillips-Lundin Northern Area Program through the CRIOS project (Calving Rates and Impact on Sea level). A.L. and S.B. are affiliated to the Climate Change Consortium of Wales (C3W). Mooring work is supported by the UK...

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Bibliographic Details
Published in:Nature Communications
Main Authors: Luckman, A., Benn, Doug I, Cottier, F., Bevan, S., Nilsen, F., Inall, M.
Other Authors: University of St Andrews. Bell-Edwards Geographic Data Institute, University of St Andrews. School of Geography & Sustainable Development, University of St Andrews. Geography & Sustainable Development
Format: Article in Journal/Newspaper
Language:English
Published: 2015
Subjects:
GC Oceanography
GE Environmental Sciences
3rd-NDAS
BDC
R2C
GC
GE
Norway
Svalbard
glacier
Tidewater
Online Access:http://hdl.handle.net/10023/7747
https://doi.org/10.1038/ncomms9566
Description
Summary:TerraSAR-X data were provided by DLR (project OCE1503), and funded by the Conoco Phillips-Lundin Northern Area Program through the CRIOS project (Calving Rates and Impact on Sea level). A.L. and S.B. are affiliated to the Climate Change Consortium of Wales (C3W). Mooring work is supported by the UK Natural Environment Research Council (Oceans 2025 and Northern Sea Program) and the Research Council of Norway (projects Cleopatra: 178766, Cleopatra II: 216537, and Circa: 214271/F20). Contribution by F.C. was undertaken through the Scottish Alliance for Geoscience Environment and Society (SAGES). Rates of ice mass loss at the calving margins of tidewater glaciers (frontal ablation rates) are a key uncertainty in sea level rise projections. Measurements are difficult because mass lost is replaced by ice flow at variable rates, and frontal ablation incorporates sub-aerial calving, and submarine melt and calving. Here we derive frontal ablation rates for three dynamically contrasting glaciers in Svalbard from an unusually dense series of satellite images. We combine ocean data, ice-front position and terminus velocity to investigate controls on frontal ablation. We find that frontal ablation is not dependent on ice dynamics, nor reduced by glacier surface freeze-up, but varies strongly with sub-surface water temperature. We conclude that calving proceeds by melt undercutting and ice-front collapse, a process that may dominate frontal ablation where submarine melt can outpace ice flow. Our findings illustrate the potential for deriving simple models of tidewater glacier response to oceanographic forcing. Publisher PDF Peer reviewed

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