Ice-dammed lake drainage in west Greenland: Drainage pattern and implications on ice flow and bedrock motion

Kristian Kjellerup Kjeldsen*, Shfaqat Abbas Khan, Anders Bjørk, Karina Nielsen, Jeremie Mouginot

*Corresponding author for this work

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Abstract

Ice-dammed lakes drain frequently in Greenland, but the impacts of these events differ between sites. Here we study the quasi-cyclic behavior of the ~40 km2 Lake Tininnilik in west Greenland and its impact on ice flow and crustal deformation. Data reveal rapid drainage of 1.83 ± 0.17 km3 of water in less than 7 days in 2010, leading to a speedup of the damming glacier, and an instantaneous modeled elastic bedrock uplift of 18.6 ± 0.1 mm confirmed by an independent lakeside GPS record. Since ice-dammed lakes are common on Greenland, our results highlight the importance of including other sources of surface loading in addition to ice mass change, when assessing glacial isostatic adjustment or elastic rebound using geodetic data. Moreover, the results illustrates a linkage between subglacial discharge and ice surface velocity, important for assessing ice flux, and thus mass balance, in a future warming climate.

Original languageEnglish
JournalGeophysical Research Letters
Volume44
Pages (from-to)7320-7327
ISSN0094-8276
DOIs
Publication statusPublished - 2017

Keywords

  • Bedrock motion
  • Drainage pattern
  • Greenland
  • Ice flow
  • Ice-dammed lake

Cite this

@article{61c52b44b9184e18832dba350b4f6343,
title = "Ice-dammed lake drainage in west Greenland: Drainage pattern and implications on ice flow and bedrock motion",
abstract = "Ice-dammed lakes drain frequently in Greenland, but the impacts of these events differ between sites. Here we study the quasi-cyclic behavior of the ~40 km2 Lake Tininnilik in west Greenland and its impact on ice flow and crustal deformation. Data reveal rapid drainage of 1.83 ± 0.17 km3 of water in less than 7 days in 2010, leading to a speedup of the damming glacier, and an instantaneous modeled elastic bedrock uplift of 18.6 ± 0.1 mm confirmed by an independent lakeside GPS record. Since ice-dammed lakes are common on Greenland, our results highlight the importance of including other sources of surface loading in addition to ice mass change, when assessing glacial isostatic adjustment or elastic rebound using geodetic data. Moreover, the results illustrates a linkage between subglacial discharge and ice surface velocity, important for assessing ice flux, and thus mass balance, in a future warming climate.",
keywords = "Bedrock motion, Drainage pattern, Greenland, Ice flow, Ice-dammed lake",
author = "Kjeldsen, {Kristian Kjellerup} and Khan, {Shfaqat Abbas} and Anders Bj{\o}rk and Karina Nielsen and Jeremie Mouginot",
year = "2017",
doi = "10.1002/2017GL074081",
language = "English",
volume = "44",
pages = "7320--7327",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "Wiley-Blackwell",

}

Ice-dammed lake drainage in west Greenland: Drainage pattern and implications on ice flow and bedrock motion. / Kjeldsen, Kristian Kjellerup; Khan, Shfaqat Abbas; Bjørk, Anders; Nielsen, Karina; Mouginot, Jeremie.

In: Geophysical Research Letters, Vol. 44, 2017, p. 7320-7327.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Ice-dammed lake drainage in west Greenland: Drainage pattern and implications on ice flow and bedrock motion

AU - Kjeldsen, Kristian Kjellerup

AU - Khan, Shfaqat Abbas

AU - Bjørk, Anders

AU - Nielsen, Karina

AU - Mouginot, Jeremie

PY - 2017

Y1 - 2017

N2 - Ice-dammed lakes drain frequently in Greenland, but the impacts of these events differ between sites. Here we study the quasi-cyclic behavior of the ~40 km2 Lake Tininnilik in west Greenland and its impact on ice flow and crustal deformation. Data reveal rapid drainage of 1.83 ± 0.17 km3 of water in less than 7 days in 2010, leading to a speedup of the damming glacier, and an instantaneous modeled elastic bedrock uplift of 18.6 ± 0.1 mm confirmed by an independent lakeside GPS record. Since ice-dammed lakes are common on Greenland, our results highlight the importance of including other sources of surface loading in addition to ice mass change, when assessing glacial isostatic adjustment or elastic rebound using geodetic data. Moreover, the results illustrates a linkage between subglacial discharge and ice surface velocity, important for assessing ice flux, and thus mass balance, in a future warming climate.

AB - Ice-dammed lakes drain frequently in Greenland, but the impacts of these events differ between sites. Here we study the quasi-cyclic behavior of the ~40 km2 Lake Tininnilik in west Greenland and its impact on ice flow and crustal deformation. Data reveal rapid drainage of 1.83 ± 0.17 km3 of water in less than 7 days in 2010, leading to a speedup of the damming glacier, and an instantaneous modeled elastic bedrock uplift of 18.6 ± 0.1 mm confirmed by an independent lakeside GPS record. Since ice-dammed lakes are common on Greenland, our results highlight the importance of including other sources of surface loading in addition to ice mass change, when assessing glacial isostatic adjustment or elastic rebound using geodetic data. Moreover, the results illustrates a linkage between subglacial discharge and ice surface velocity, important for assessing ice flux, and thus mass balance, in a future warming climate.

KW - Bedrock motion

KW - Drainage pattern

KW - Greenland

KW - Ice flow

KW - Ice-dammed lake

U2 - 10.1002/2017GL074081

DO - 10.1002/2017GL074081

M3 - Journal article

AN - SCOPUS:85024398787

VL - 44

SP - 7320

EP - 7327

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

ER -