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

Jørgen Bendtsen; John Mortensen; Kunuk Lennert; Jens K. Ehn; Wieter Boone; Virginie Galindo; Yu Bin Hu; Igor A. Dmitrenko; Sergei A. Kirillov; Kristian Kjellerup Kjeldsen; Yngve Kristoffersen; David G. Barber; Søren Rysgaard

doi:10.1038/s41598-017-05089-3

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

Jørgen Bendtsen^*, John Mortensen, Kunuk Lennert, Jens K. Ehn, Wieter Boone, Virginie Galindo, Yu Bin Hu, Igor A. Dmitrenko, Sergei A. Kirillov, Kristian Kjellerup Kjeldsen, Yngve Kristoffersen, David G. Barber, Søren Rysgaard

^*Corresponding author for this work

11 Citations (Scopus)

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Abstract

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.

Original language	English
Article number	4941
Journal	Scientific Reports
Volume	7
Number of pages	11
ISSN	2045-2322
DOIs	https://doi.org/10.1038/s41598-017-05089-3
Publication status	Published - 10 Jul 2017

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Bendtsen, J., Mortensen, J., Lennert, K., Ehn, J. K., Boone, W., Galindo, V., Hu, Y. B., Dmitrenko, I. A., Kirillov, S. A., Kjeldsen, K. K., Kristoffersen, Y., Barber, D. G., & Rysgaard, S. (2017). Sea ice breakup and marine melt of a retreating tidewater outlet glacier in northeast Greenland (81°N). Scientific Reports, 7, [4941]. https://doi.org/10.1038/s41598-017-05089-3

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abstract = "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.",

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AU - Bendtsen, Jørgen

AU - Mortensen, John

AU - Lennert, Kunuk

AU - Ehn, Jens K.

AU - Boone, Wieter

AU - Galindo, Virginie

AU - Hu, Yu Bin

AU - Dmitrenko, Igor A.

AU - Kirillov, Sergei A.

AU - Kjeldsen, Kristian Kjellerup

AU - Kristoffersen, Yngve

AU - Barber, David G.

AU - Rysgaard, Søren

PY - 2017/7/10

Y1 - 2017/7/10

N2 - 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.

AB - 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.

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

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