Physical conditions of fast glacier flow3. Seasonally-evolving ice deformation on Store Glacier, West Greenland

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Physical conditions of fast glacier flow : 3. Seasonally-evolving ice deformation on Store Glacier, West Greenland. / Young, T. J.; Christoffersen, P.; Doyle, S. H.; Nicholls, K. W.; Stewart, C. L.; Hubbard, B.; Hubbard, A.; Lok, L. B.; Brennan, P.; Benn, D. I.; Luckman, A.; Bougamont, M.

In: Journal of Geophysical Research: Earth Surface, Vol. 124, No. 1, 08.01.2019, p. 245-267.

Research output: Contribution to journalArticle

Harvard

Young, TJ, Christoffersen, P, Doyle, SH, Nicholls, KW, Stewart, CL, Hubbard, B, Hubbard, A, Lok, LB, Brennan, P, Benn, DI, Luckman, A & Bougamont, M 2019, 'Physical conditions of fast glacier flow: 3. Seasonally-evolving ice deformation on Store Glacier, West Greenland', Journal of Geophysical Research: Earth Surface, vol. 124, no. 1, pp. 245-267. https://doi.org/10.1029/2018JF004821

APA

Young, T. J., Christoffersen, P., Doyle, S. H., Nicholls, K. W., Stewart, C. L., Hubbard, B., Hubbard, A., Lok, L. B., Brennan, P., Benn, D. I., Luckman, A., & Bougamont, M. (2019). Physical conditions of fast glacier flow: 3. Seasonally-evolving ice deformation on Store Glacier, West Greenland. Journal of Geophysical Research: Earth Surface, 124(1), 245-267. https://doi.org/10.1029/2018JF004821

Vancouver

Young TJ, Christoffersen P, Doyle SH, Nicholls KW, Stewart CL, Hubbard B et al. Physical conditions of fast glacier flow: 3. Seasonally-evolving ice deformation on Store Glacier, West Greenland. Journal of Geophysical Research: Earth Surface. 2019 Jan 8;124(1):245-267. https://doi.org/10.1029/2018JF004821

Author

Young, T. J. ; Christoffersen, P. ; Doyle, S. H. ; Nicholls, K. W. ; Stewart, C. L. ; Hubbard, B. ; Hubbard, A. ; Lok, L. B. ; Brennan, P. ; Benn, D. I. ; Luckman, A. ; Bougamont, M. / Physical conditions of fast glacier flow : 3. Seasonally-evolving ice deformation on Store Glacier, West Greenland. In: Journal of Geophysical Research: Earth Surface. 2019 ; Vol. 124, No. 1. pp. 245-267.

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@article{809fd04fd2874ceeaf78160a9d23aaa8,
title = "Physical conditions of fast glacier flow: 3. Seasonally-evolving ice deformation on Store Glacier, West Greenland",
abstract = "Temporal variations in ice sheet flow directly impact the internal structure within ice sheets through englacial deformation. Large‐scale changes in the vertical stratigraphy within ice sheets have been previously conducted on centennial to millennial timescales; however, intra‐annual changes in the morphology of internal layers have yet to be explored. Over a period of two years, we use autonomous phase‐sensitive radio‐echo sounding (ApRES) to track the daily displacement of internal layers on Store Glacier, West Greenland to millimeter accuracy. At a site located ∼30 km from the calving terminus, where the ice is ∼600m thick and flows at ∼700m a−1, we measure distinct seasonal variations in vertical velocities and vertical strain rates over a two‐year period. Prior to the melt season (March–June), we observe increasingly non‐linear englacial deformation with negative vertical strain rates (i.e. strain thinning) in the upper half of the ice column of ∼‐0.03a−1, whereas the ice below thickens under vertical strain reaching up to 0.16a−1. Early in the melt season (June–July), vertical thinning gradually ceases as the glacier increasingly thickens. During late summer to midwinter (August–February), vertical thickening occurs linearly throughout the entire ice column, with strain rates averaging 0.016a−1. We show that these complex variations are unrelated to topographic setting and localized basal slip, and hypothesize that this seasonality is driven by far‐field perturbations in the glacier's force balance, in this case generated by variations in basal hydrology near the glacier's terminus and propagated tens of kilometers upstream through longitudinal coupling",
keywords = "Greenland, glacier, radar, strain, ice sheet",
author = "Young, {T. J.} and P. Christoffersen and Doyle, {S. H.} and Nicholls, {K. W.} and Stewart, {C. L.} and B. Hubbard and A. Hubbard and Lok, {L. B.} and P. Brennan and Benn, {D. I.} and A. Luckman and M. Bougamont",
year = "2019",
month = jan,
day = "8",
doi = "10.1029/2018JF004821",
language = "English",
volume = "124",
pages = "245--267",
journal = "Journal of Geophysical Research: Earth Surface",
issn = "2169-9003",
publisher = "Wiley",
number = "1",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Physical conditions of fast glacier flow

T2 - 3. Seasonally-evolving ice deformation on Store Glacier, West Greenland

AU - Young, T. J.

AU - Christoffersen, P.

AU - Doyle, S. H.

AU - Nicholls, K. W.

AU - Stewart, C. L.

AU - Hubbard, B.

AU - Hubbard, A.

AU - Lok, L. B.

AU - Brennan, P.

AU - Benn, D. I.

AU - Luckman, A.

AU - Bougamont, M.

PY - 2019/1/8

Y1 - 2019/1/8

N2 - Temporal variations in ice sheet flow directly impact the internal structure within ice sheets through englacial deformation. Large‐scale changes in the vertical stratigraphy within ice sheets have been previously conducted on centennial to millennial timescales; however, intra‐annual changes in the morphology of internal layers have yet to be explored. Over a period of two years, we use autonomous phase‐sensitive radio‐echo sounding (ApRES) to track the daily displacement of internal layers on Store Glacier, West Greenland to millimeter accuracy. At a site located ∼30 km from the calving terminus, where the ice is ∼600m thick and flows at ∼700m a−1, we measure distinct seasonal variations in vertical velocities and vertical strain rates over a two‐year period. Prior to the melt season (March–June), we observe increasingly non‐linear englacial deformation with negative vertical strain rates (i.e. strain thinning) in the upper half of the ice column of ∼‐0.03a−1, whereas the ice below thickens under vertical strain reaching up to 0.16a−1. Early in the melt season (June–July), vertical thinning gradually ceases as the glacier increasingly thickens. During late summer to midwinter (August–February), vertical thickening occurs linearly throughout the entire ice column, with strain rates averaging 0.016a−1. We show that these complex variations are unrelated to topographic setting and localized basal slip, and hypothesize that this seasonality is driven by far‐field perturbations in the glacier's force balance, in this case generated by variations in basal hydrology near the glacier's terminus and propagated tens of kilometers upstream through longitudinal coupling

AB - Temporal variations in ice sheet flow directly impact the internal structure within ice sheets through englacial deformation. Large‐scale changes in the vertical stratigraphy within ice sheets have been previously conducted on centennial to millennial timescales; however, intra‐annual changes in the morphology of internal layers have yet to be explored. Over a period of two years, we use autonomous phase‐sensitive radio‐echo sounding (ApRES) to track the daily displacement of internal layers on Store Glacier, West Greenland to millimeter accuracy. At a site located ∼30 km from the calving terminus, where the ice is ∼600m thick and flows at ∼700m a−1, we measure distinct seasonal variations in vertical velocities and vertical strain rates over a two‐year period. Prior to the melt season (March–June), we observe increasingly non‐linear englacial deformation with negative vertical strain rates (i.e. strain thinning) in the upper half of the ice column of ∼‐0.03a−1, whereas the ice below thickens under vertical strain reaching up to 0.16a−1. Early in the melt season (June–July), vertical thinning gradually ceases as the glacier increasingly thickens. During late summer to midwinter (August–February), vertical thickening occurs linearly throughout the entire ice column, with strain rates averaging 0.016a−1. We show that these complex variations are unrelated to topographic setting and localized basal slip, and hypothesize that this seasonality is driven by far‐field perturbations in the glacier's force balance, in this case generated by variations in basal hydrology near the glacier's terminus and propagated tens of kilometers upstream through longitudinal coupling

KW - Greenland

KW - glacier

KW - radar

KW - strain

KW - ice sheet

U2 - 10.1029/2018JF004821

DO - 10.1029/2018JF004821

M3 - Article

C2 - 31007992

VL - 124

SP - 245

EP - 267

JO - Journal of Geophysical Research: Earth Surface

JF - Journal of Geophysical Research: Earth Surface

SN - 2169-9003

IS - 1

ER -

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