Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N).

Autor:	Bendtsen J; Arctic Research Centre, Aarhus University, 8000, Aarhus, Denmark. jb@climatelab.dk.; ClimateLab, Symbion Science Park, Fruebjergvej 3, 2100, Copenhagen O, Denmark. jb@climatelab.dk., Mortensen J; Greenland Climate Research Centre, Greenland Institute of Natural Resources, PO Box 570, 3900, Nuuk, Greenland., Lennert K; Greenland Climate Research Centre, Greenland Institute of Natural Resources, PO Box 570, 3900, Nuuk, Greenland., K Ehn J; Centre for Earth Observation Science, CHR Faculty of Environment, Earth, and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, MB R3T 2N2, Canada., Boone W; Centre for Earth Observation Science, CHR Faculty of Environment, Earth, and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, MB R3T 2N2, Canada., Galindo V; Centre for Earth Observation Science, CHR Faculty of Environment, Earth, and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, MB R3T 2N2, Canada., Hu YB; Centre for Earth Observation Science, CHR Faculty of Environment, Earth, and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, MB R3T 2N2, Canada., Dmitrenko IA; Centre for Earth Observation Science, CHR Faculty of Environment, Earth, and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, MB R3T 2N2, Canada., Kirillov SA; Centre for Earth Observation Science, CHR Faculty of Environment, Earth, and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, MB R3T 2N2, Canada., Kjeldsen KK; Department of Earth Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.; Centre for GeoGenetics, Natural History Museum, University of Copenhagen, Øster Voldgade 5-7, 1350, Copenhagen K, Denmark., Kristoffersen Y; Department of Earth Science, University of Bergen, Bergen, Norway., G Barber D; Centre for Earth Observation Science, CHR Faculty of Environment, Earth, and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, MB R3T 2N2, Canada., Rysgaard S; Arctic Research Centre, Aarhus University, 8000, Aarhus, Denmark.; Greenland Climate Research Centre, Greenland Institute of Natural Resources, PO Box 570, 3900, Nuuk, Greenland.; Centre for Earth Observation Science, CHR Faculty of Environment, Earth, and Resources, University of Manitoba, 499 Wallace Building, Winnipeg, MB R3T 2N2, Canada.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2017 Jul 10; Vol. 7 (1), pp. 4941. Date of Electronic Publication: 2017 Jul 10.
DOI:	10.1038/s41598-017-05089-3
Abstrakt:	Rising temperatures in the Arctic cause accelerated mass loss from the Greenland Ice Sheet and reduced sea ice cover. Tidewater outlet glaciers represent direct connections between glaciers and the ocean where melt rates at the ice-ocean interface are influenced by ocean temperature and circulation. However, few measurements exist near outlet glaciers from the northern coast towards the Arctic Ocean that has remained nearly permanently ice covered. Here we present hydrographic measurements along the terminus of a major retreating tidewater outlet glacier from Flade Isblink Ice Cap. We show that the region is characterized by a relatively large change of the seasonal freshwater content, corresponding to ~2 m of freshwater, and that solar heating during the short open water period results in surface layer temperatures above 1 °C. Observations of temperature and salinity supported that the outlet glacier is a floating ice shelf with near-glacial subsurface temperatures at the freezing point. Melting from the surface layer significantly influenced the ice foot morphology of the glacier terminus. Hence, melting of the tidewater outlet glacier was found to be critically dependent on the retreat of sea ice adjacent to the terminus and the duration of open water.
Databáze:	MEDLINE
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