Anker Weidick

Brice R. Rea

Crantz

Cuffey

Dirk Van As

Douglas W.F. Mair

Faezeh M. Nick

Giesecke

J. Edward Schofield

James M. Lea

Kleinschmidt

Kurt H. Kjær

Mathieu Morlighem

Rink

Thorhallesen

Weidick

Journal of Glaciology

English

Lea, James M.

Mair, Douglas W.F.

Nick, Faezeh M.

Rea, Brice R.

Weidick, Anker

Kjaer, Kurt H.

Morlighem, Mathieu

van As, Dirk

Schofield, J. Edward

Research Archive

13 others (2010) History of the Greenland Ice Sheet: paleoclimatic insights.

Calving laws’, ‘sliding laws’ and the stability of tidewater glaciers.

D ðA4Þ This full-depth calving criterion is employed given that instances of full-depth calving behaviour were observed at KNS during fieldwork conducted in

Observations on some Holocene glacier fluctuations in

The sensitivity of flowline models of tidewater glaciers to parameter uncertainty.

Using proglacial-threshold lakes to constrain fluctuations of the Jakobshavn Isbræ ice margin, western Greenland, during the Holocene.

Terminus-driven retreat of a major southwest Greenland tidewater glacier during the early 19th century : insights from glacier reconstructions and numerical modelling

Tidewater glaciers in Greenland experienced widespread retreat during the last century. Information on their behaviour prior to this is often poorly constrained due to lack of observations, while determining the drivers prior to instrumental records is also problematic. Here we present a record of the dynamics of Kangiata Nunaata Sermia (KNS), southwest Greenland, from its Little Ice Age maximum (LIAmax) to 1859 – the period before continuous air temperature observations began at Nuuk in 1866. Using glacial geomorphology, historical accounts, photographs and GIS analyses, we provide evidence KNS was at its LIAmax by 1761, had retreated by ~5 km by 1808 and a further 7 km by 1859. This predates retreat at Jakobshavn Isbræ by 43–113 years, demonstrating the asynchroneity of tidewater glacier terminus response following the LIA. We use a one-dimensional flowband model to determine the relative sensitivity of KNS to atmospheric and oceanic climate forcing. Results demonstrate that terminus forcing rather than surface mass balance drove the retreat. Modelled glacier sensitivity to submarine melt rates is also insufficient to explain the retreat observed. However, moderate increases in crevasse water depth, driving an increase in calving, are capable of causing terminus retreat of the observed magnitude and timing

Lea, James M

Mair, Douglas WF

Nick, Faezeh M

Rea, Brice R

Kjaer, Kurt H

Schofield, J Edward

University of Liverpool Repository

Terminus-driven retreat of a major southwest Greenland tidewater glacier during the early 19th century: insights from glacier reconstructions and numerical modelling

Tidewater glaciers in Greenland experienced widespread retreat during the last century. Information on their behaviour prior to this is often poorly constrained due to lack of observations, while determining the drivers prior to instrumental records is also problematic. Here we present a record of the dynamics of Kangiata Nunaata Sermia (KNS), southwest Greenland, from its Little Ice Age maximum (LIAmax) to 1859 – the period before continuous air temperature observations began at Nuuk in 1866. Using glacial geomorphology, historical accounts, photographs and GIS analyses, we provide evidence KNS was at its LIAmax by 1761, had retreated by ∼5 km by 1808 and a further 7 km by 1859. This predates retreat at Jakobshavn Isbrae by 43–113 years, demonstrating the asynchroneity of tidewater glacier terminus response following the LIA. We use a one-dimensional flowband model to determine the relative sensitivity of KNS to atmospheric and oceanic climate forcing. Results demonstrate that terminus forcing rather than surface mass balance drove the retreat. Modelled glacier sensitivity to submarine melt rates is also insufficient to explain the retreat observed. However, moderate increases in crevasse water depth, driving an increase in calving, are capable of causing terminus retreat of the observed magnitude and timing

Van As, Dirk

eScholarship - University of California

Mair, Douglas W. F.

Kjær, Kurt H.

Copenhagen University Research Information System

Terminus-driven retreat of a major southwest Greenland tidewater glacier during the early 19th century:insights from glacier reconstructions and numerical modelling

AbstractTidewater glaciers in Greenland experienced widespread retreat during the last century. Information on their behaviour prior to this is often poorly constrained due to lack of observations, while determining the drivers prior to instrumental records is also problematic. Here we present a record of the dynamics of Kangiata Nunaata Sermia (KNS), southwest Greenland, from its Little Ice Age maximum (LIAmax) to 1859 – the period before continuous air temperature observations began at Nuuk in 1866. Using glacial geomorphology, historical accounts, photographs and GIS analyses, we provide evidence KNS was at its LIAmax by 1761, had retreated by ~5 km by 1808 and a further 7 km by 1859. This predates retreat at Jakobshavn Isbræ by 43–113 years, demonstrating the asynchroneity of tidewater glacier terminus response following the LIA. We use a one-dimensional flowband model to determine the relative sensitivity of KNS to atmospheric and oceanic climate forcing. Results demonstrate that terminus forcing rather than surface mass balance drove the retreat. Modelled glacier sensitivity to submarine melt rates is also insufficient to explain the retreat observed. However, moderate increases in crevasse water depth, driving an increase in calving, are capable of causing terminus retreat of the observed magnitude and timing.</jats:p

Crossref

Tidewater glaciers in Greenland experienced widespread retreat during the last century. Information on their behaviour prior to this is often poorly constrained due to lack of observations, while determining the drivers prior to instrumental records is also problematic. Here we present a record of the dynamics of Kangiata Nunaata Sermia (KNS), southwest Greenland, from its Little Ice Age maximum (LIAmax) to 1859 - the period before continuous air temperature observations began at Nuuk in 1866. Using glacial geomorphology, historical accounts, photographs and GIS analyses, we provide evidence KNS was at its LIAmax by 1761, had retreated by~5 km by 1808 and a further 7km by 1859. This predates retreat at Jakobshavn Isbræ by 43-113 years, demonstrating the asynchroneity of tidewater glacier terminus response following the LIA. We use a one-dimensional flowband model to determine the relative sensitivity of KNS to atmospheric and oceanic climate forcing. Results demonstrate that terminus forcing rather than surface mass balance drove the retreat. Modelled glacier sensitivity to submarine melt rates is also insufficient toexplain the retreat observed. However, moderate increases in crevasse water depth, driving an increase in calving,are capable of causing terminus retreat of the observed magnitude and timing

Lea, JM

Mair, DWF

Nick, FM

Rea, BR

Weidick, A

Kjær, KH

Morlighem, M

Van As, D

Schofield, JE

Terminus-driven retreat of a major southwest Greenland tidewater glacier during the early 19th century: Insights from glacier reconstructions and numerical modelling

http://livrepository.liverpool.ac.uk/3000089/1/Lea_et_al_2014_JGlac_KNS.pdf

Terminus-driven retreat of a major southwest Greenland tidewater glacier during the early 19th century : insights from glacier reconstructions and numerical modelling

Abstract

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Copenhagen University Research Information System

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eScholarship - University of California