Upper bounds on subglacial channel development for interior regions of the Greenland Ice Sheet

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Upper bounds on subglacial channel development for interior regions of the Greenland Ice Sheet. / Dow, C. F.; Kulessa, B.; Rutt, I. C.; Doyle, Samuel Huckerby; Hubbard, Alun.

Yn: Journal of Glaciology, Cyfrol 60, Rhif 224, 2014, t. 1044-1052.

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

Harvard

Dow, CF, Kulessa, B, Rutt, IC, Doyle, SH & Hubbard, A 2014, 'Upper bounds on subglacial channel development for interior regions of the Greenland Ice Sheet', Journal of Glaciology, cyfrol. 60, rhif 224, tt. 1044-1052. https://doi.org/10.3189/2014JoG14J093

APA

Dow, C. F., Kulessa, B., Rutt, I. C., Doyle, S. H., & Hubbard, A. (2014). Upper bounds on subglacial channel development for interior regions of the Greenland Ice Sheet. Journal of Glaciology, 60(224), 1044-1052. https://doi.org/10.3189/2014JoG14J093

Vancouver

Author

Dow, C. F. ; Kulessa, B. ; Rutt, I. C. ; Doyle, Samuel Huckerby ; Hubbard, Alun. / Upper bounds on subglacial channel development for interior regions of the Greenland Ice Sheet. Yn: Journal of Glaciology. 2014 ; Cyfrol 60, Rhif 224. tt. 1044-1052.

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@article{d1c95d33b81a4435bfe8a1c2b8824c08,
title = "Upper bounds on subglacial channel development for interior regions of the Greenland Ice Sheet",
abstract = "We use a simple numerical model to test whether surface water influx to the bed of the interior Greenland ice sheet has the potential to cause significant subglacial channel growth similar to that observed near the ice-sheet margin and at alpine glaciers. We examine the effects on channel growth from (1) rapid supraglacial lake drainage events and (2) sustained water input into moulins. Byassuming that all drainage occurs through subglacial channels and by prescribing favorable pressure conditions at the domain inlet, the model can provide upper bounds on channel growth. Our results indicate that R-channels do not grow significantly within the limited period of high pressure associatedwith lake drainage events. Subsequent channel growth only occurs with sustained pressures above overburden. Rapid closure of channels at low pressures suggests channels in the interior are unlikely to draw significant quantities of water from nearby distributed networks. These results indicate that other drainage mechanisms such as turbulent sheets or linked-cavity networks are likely to be of greater importance for interior subglacial drainage than the growth of channels.Embargo until 01/07/2015",
keywords = "arctic glaciology, glacier hydrology, glacier modelling, ice-sheetmodelling, subglacial processes",
author = "Dow, {C. F.} and B. Kulessa and Rutt, {I. C.} and Doyle, {Samuel Huckerby} and Alun Hubbard",
note = "Dow, C. F., Kulessa, B., Rutt, I. C., Doyle, S. H., Hubbard, A. (2014). Upper bounds on subglacial channel development for interior regions of the Greenland Ice Sheet. Journal of Glaciology, 60 (224), 1044-1052. Embargo until 01/07/2015",
year = "2014",
doi = "10.3189/2014JoG14J093",
language = "English",
volume = "60",
pages = "1044--1052",
journal = "Journal of Glaciology",
issn = "0022-1430",
publisher = "INT GLACIOL SOC",
number = "224",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Upper bounds on subglacial channel development for interior regions of the Greenland Ice Sheet

AU - Dow, C. F.

AU - Kulessa, B.

AU - Rutt, I. C.

AU - Doyle, Samuel Huckerby

AU - Hubbard, Alun

N1 - Dow, C. F., Kulessa, B., Rutt, I. C., Doyle, S. H., Hubbard, A. (2014). Upper bounds on subglacial channel development for interior regions of the Greenland Ice Sheet. Journal of Glaciology, 60 (224), 1044-1052. Embargo until 01/07/2015

PY - 2014

Y1 - 2014

N2 - We use a simple numerical model to test whether surface water influx to the bed of the interior Greenland ice sheet has the potential to cause significant subglacial channel growth similar to that observed near the ice-sheet margin and at alpine glaciers. We examine the effects on channel growth from (1) rapid supraglacial lake drainage events and (2) sustained water input into moulins. Byassuming that all drainage occurs through subglacial channels and by prescribing favorable pressure conditions at the domain inlet, the model can provide upper bounds on channel growth. Our results indicate that R-channels do not grow significantly within the limited period of high pressure associatedwith lake drainage events. Subsequent channel growth only occurs with sustained pressures above overburden. Rapid closure of channels at low pressures suggests channels in the interior are unlikely to draw significant quantities of water from nearby distributed networks. These results indicate that other drainage mechanisms such as turbulent sheets or linked-cavity networks are likely to be of greater importance for interior subglacial drainage than the growth of channels.Embargo until 01/07/2015

AB - We use a simple numerical model to test whether surface water influx to the bed of the interior Greenland ice sheet has the potential to cause significant subglacial channel growth similar to that observed near the ice-sheet margin and at alpine glaciers. We examine the effects on channel growth from (1) rapid supraglacial lake drainage events and (2) sustained water input into moulins. Byassuming that all drainage occurs through subglacial channels and by prescribing favorable pressure conditions at the domain inlet, the model can provide upper bounds on channel growth. Our results indicate that R-channels do not grow significantly within the limited period of high pressure associatedwith lake drainage events. Subsequent channel growth only occurs with sustained pressures above overburden. Rapid closure of channels at low pressures suggests channels in the interior are unlikely to draw significant quantities of water from nearby distributed networks. These results indicate that other drainage mechanisms such as turbulent sheets or linked-cavity networks are likely to be of greater importance for interior subglacial drainage than the growth of channels.Embargo until 01/07/2015

KW - arctic glaciology

KW - glacier hydrology

KW - glacier modelling

KW - ice-sheetmodelling

KW - subglacial processes

UR - http://hdl.handle.net/2160/27677

U2 - 10.3189/2014JoG14J093

DO - 10.3189/2014JoG14J093

M3 - Article

VL - 60

SP - 1044

EP - 1052

JO - Journal of Glaciology

JF - Journal of Glaciology

SN - 0022-1430

IS - 224

ER -

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