Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age

Shfaqat Abbas Khan, Kristian Kjellerup Kjeldsen, Kurt H. Kjær, Suzanne Bevan, Adrian Luckman, A. Aschwanden, Anders Anker Bjørk, Niels J. Korsgaard, Jason E. Box, Michiel R van den Broeke, Tonie M van Dam, Antje Fitzner

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Abstract

Observations over the past decade show significant ice loss associated with the speed-up of glaciers in southeast Greenland from 2003, followed by a deceleration from 2006. These short-term, episodic, dynamic perturbations have a major impact on the mass balance on the decadal scale. To improve the projection of future sea level rise, a long-term data record that reveals the mass balance beyond such episodic events is required. Here, we extend the observational record of marginal thinning of Helheim and Kangerdlugssuaq glaciers from 10 to more than 80 years. We show that, although the frontal portion of Helheim Glacier thinned by more than 100 m between 2003 and 2006, it thickened by more than 50 m during the previous two decades. In contrast, Kangerdlugssuaq Glacier underwent minor thinning of 40–50 m from 1981 to 1998 and major thinning of more than 100 m after 2003. Extending the record back to the end of the Little Ice Age (prior to 1930) shows no thinning of Helheim Glacier from its maximum extent during the Little Ice Age to 1981, while Kangerdlugssuaq Glacier underwent substantial thinning of 230 to 265 m. Comparison of sub-surface water temperature anomalies and variations in air temperature to records of thickness and velocity change suggest that both glaciers are highly sensitive to short-term atmospheric and ocean forcing, and respond very quickly to small fluctuations. On century timescales, however, multiple external parameters (e.g. outlet glacier shape) may dominate the mass change. These findings suggest that special care must be taken in the projection of future dynamic ice loss.
Original languageEnglish
JournalCryosphere
Volume8
Pages (from-to)1497-1507
ISSN1994-0416
DOIs
Publication statusPublished - 2014

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Cite this

Khan, S. A., Kjeldsen, K. K., Kjær, K. H., Bevan, S., Luckman, A., Aschwanden, A., ... Fitzner, A. (2014). Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age. Cryosphere, 8, 1497-1507. https://doi.org/10.5194/tc-8-1497-2014
Khan, Shfaqat Abbas ; Kjeldsen, Kristian Kjellerup ; Kjær, Kurt H. ; Bevan, Suzanne ; Luckman, Adrian ; Aschwanden, A. ; Bjørk, Anders Anker ; Korsgaard, Niels J. ; Box, Jason E. ; van den Broeke, Michiel R ; van Dam, Tonie M ; Fitzner, Antje. / Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age. In: Cryosphere. 2014 ; Vol. 8. pp. 1497-1507.
@article{06f7891ea8ff4d6e8b7ff2162afdaa4c,
title = "Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age",
abstract = "Observations over the past decade show significant ice loss associated with the speed-up of glaciers in southeast Greenland from 2003, followed by a deceleration from 2006. These short-term, episodic, dynamic perturbations have a major impact on the mass balance on the decadal scale. To improve the projection of future sea level rise, a long-term data record that reveals the mass balance beyond such episodic events is required. Here, we extend the observational record of marginal thinning of Helheim and Kangerdlugssuaq glaciers from 10 to more than 80 years. We show that, although the frontal portion of Helheim Glacier thinned by more than 100 m between 2003 and 2006, it thickened by more than 50 m during the previous two decades. In contrast, Kangerdlugssuaq Glacier underwent minor thinning of 40–50 m from 1981 to 1998 and major thinning of more than 100 m after 2003. Extending the record back to the end of the Little Ice Age (prior to 1930) shows no thinning of Helheim Glacier from its maximum extent during the Little Ice Age to 1981, while Kangerdlugssuaq Glacier underwent substantial thinning of 230 to 265 m. Comparison of sub-surface water temperature anomalies and variations in air temperature to records of thickness and velocity change suggest that both glaciers are highly sensitive to short-term atmospheric and ocean forcing, and respond very quickly to small fluctuations. On century timescales, however, multiple external parameters (e.g. outlet glacier shape) may dominate the mass change. These findings suggest that special care must be taken in the projection of future dynamic ice loss.",
author = "Khan, {Shfaqat Abbas} and Kjeldsen, {Kristian Kjellerup} and Kj{\ae}r, {Kurt H.} and Suzanne Bevan and Adrian Luckman and A. Aschwanden and Bj{\o}rk, {Anders Anker} and Korsgaard, {Niels J.} and Box, {Jason E.} and {van den Broeke}, {Michiel R} and {van Dam}, {Tonie M} and Antje Fitzner",
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year = "2014",
doi = "10.5194/tc-8-1497-2014",
language = "English",
volume = "8",
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Khan, SA, Kjeldsen, KK, Kjær, KH, Bevan, S, Luckman, A, Aschwanden, A, Bjørk, AA, Korsgaard, NJ, Box, JE, van den Broeke, MR, van Dam, TM & Fitzner, A 2014, 'Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age', Cryosphere, vol. 8, pp. 1497-1507. https://doi.org/10.5194/tc-8-1497-2014

Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age. / Khan, Shfaqat Abbas; Kjeldsen, Kristian Kjellerup; Kjær, Kurt H.; Bevan, Suzanne; Luckman, Adrian; Aschwanden, A.; Bjørk, Anders Anker; Korsgaard, Niels J.; Box, Jason E.; van den Broeke, Michiel R; van Dam, Tonie M; Fitzner, Antje.

In: Cryosphere, Vol. 8, 2014, p. 1497-1507.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age

AU - Khan, Shfaqat Abbas

AU - Kjeldsen, Kristian Kjellerup

AU - Kjær, Kurt H.

AU - Bevan, Suzanne

AU - Luckman, Adrian

AU - Aschwanden, A.

AU - Bjørk, Anders Anker

AU - Korsgaard, Niels J.

AU - Box, Jason E.

AU - van den Broeke, Michiel R

AU - van Dam, Tonie M

AU - Fitzner, Antje

N1 - CC Attribution 3.0 License

PY - 2014

Y1 - 2014

N2 - Observations over the past decade show significant ice loss associated with the speed-up of glaciers in southeast Greenland from 2003, followed by a deceleration from 2006. These short-term, episodic, dynamic perturbations have a major impact on the mass balance on the decadal scale. To improve the projection of future sea level rise, a long-term data record that reveals the mass balance beyond such episodic events is required. Here, we extend the observational record of marginal thinning of Helheim and Kangerdlugssuaq glaciers from 10 to more than 80 years. We show that, although the frontal portion of Helheim Glacier thinned by more than 100 m between 2003 and 2006, it thickened by more than 50 m during the previous two decades. In contrast, Kangerdlugssuaq Glacier underwent minor thinning of 40–50 m from 1981 to 1998 and major thinning of more than 100 m after 2003. Extending the record back to the end of the Little Ice Age (prior to 1930) shows no thinning of Helheim Glacier from its maximum extent during the Little Ice Age to 1981, while Kangerdlugssuaq Glacier underwent substantial thinning of 230 to 265 m. Comparison of sub-surface water temperature anomalies and variations in air temperature to records of thickness and velocity change suggest that both glaciers are highly sensitive to short-term atmospheric and ocean forcing, and respond very quickly to small fluctuations. On century timescales, however, multiple external parameters (e.g. outlet glacier shape) may dominate the mass change. These findings suggest that special care must be taken in the projection of future dynamic ice loss.

AB - Observations over the past decade show significant ice loss associated with the speed-up of glaciers in southeast Greenland from 2003, followed by a deceleration from 2006. These short-term, episodic, dynamic perturbations have a major impact on the mass balance on the decadal scale. To improve the projection of future sea level rise, a long-term data record that reveals the mass balance beyond such episodic events is required. Here, we extend the observational record of marginal thinning of Helheim and Kangerdlugssuaq glaciers from 10 to more than 80 years. We show that, although the frontal portion of Helheim Glacier thinned by more than 100 m between 2003 and 2006, it thickened by more than 50 m during the previous two decades. In contrast, Kangerdlugssuaq Glacier underwent minor thinning of 40–50 m from 1981 to 1998 and major thinning of more than 100 m after 2003. Extending the record back to the end of the Little Ice Age (prior to 1930) shows no thinning of Helheim Glacier from its maximum extent during the Little Ice Age to 1981, while Kangerdlugssuaq Glacier underwent substantial thinning of 230 to 265 m. Comparison of sub-surface water temperature anomalies and variations in air temperature to records of thickness and velocity change suggest that both glaciers are highly sensitive to short-term atmospheric and ocean forcing, and respond very quickly to small fluctuations. On century timescales, however, multiple external parameters (e.g. outlet glacier shape) may dominate the mass change. These findings suggest that special care must be taken in the projection of future dynamic ice loss.

U2 - 10.5194/tc-8-1497-2014

DO - 10.5194/tc-8-1497-2014

M3 - Journal article

VL - 8

SP - 1497

EP - 1507

JO - Cryosphere

JF - Cryosphere

SN - 1994-0416

ER -