Mapping of a Hydrological Ice Sheet Drainage Basin on the West Greenland Ice Sheet Margin from ERS-1/2 SAR Interferometry, Ice-Radar Measurement, and Modelling

Andreas P. Ahlstrøm, C.E. Bøggild, L. Stenseng, Johan Jacob Mohr, Niels Reeh, Erik Lintz Christensen, O.B. Olesen, K. Keller

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The hydrological ice-sheet basin draining into the Tasersiaq lake, West Greenland (66°13'N, 50°30'W), was delineated, First using standard digital elevation models (DEMs) for ice-sheet surface and bedrock, and subsequently using a new high-resolution dataset, with a surface DEM derived from repeat-track interferometric synthetic aperture radar (SAR) and a bedrock topography derived from an airborne 60 MHz ice-penetrating radar. The extent of the delineation was calculated from a water-pressure potential as a function of the ice-sheet surface and bedrock elevations and a hydraulic factor κ describing the relative importance of the potential of the ice overburden pressure compared to the bedrock topography. The meltwater run-off for the basin delineations was modelled with an energy-balance model calibrated with observed ice-sheet ablation and compared to a 25 year time series of measured basin run-off. The standard DEMs were found to be inadequate for delineation purposes, whereas delineations from high-resolution data were found to be very sensitive to changes in κ in a non-linear way, causing a factor 5 change of basin area, corresponding to a doubling of the modelled runoff. The 50% standard deviation of the measured basin run-off could thus be explained by small year-to-year variations of the κ-factor
Original languageEnglish
JournalAnnals of Glaciology
Volume34
Pages (from-to)309-314
ISSN0260-3055
DOIs
Publication statusPublished - 2002

Cite this

Ahlstrøm, Andreas P. ; Bøggild, C.E. ; Stenseng, L. ; Mohr, Johan Jacob ; Reeh, Niels ; Christensen, Erik Lintz ; Olesen, O.B. ; Keller, K. / Mapping of a Hydrological Ice Sheet Drainage Basin on the West Greenland Ice Sheet Margin from ERS-1/2 SAR Interferometry, Ice-Radar Measurement, and Modelling. In: Annals of Glaciology. 2002 ; Vol. 34. pp. 309-314.
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title = "Mapping of a Hydrological Ice Sheet Drainage Basin on the West Greenland Ice Sheet Margin from ERS-1/2 SAR Interferometry, Ice-Radar Measurement, and Modelling",
abstract = "The hydrological ice-sheet basin draining into the Tasersiaq lake, West Greenland (66°13'N, 50°30'W), was delineated, First using standard digital elevation models (DEMs) for ice-sheet surface and bedrock, and subsequently using a new high-resolution dataset, with a surface DEM derived from repeat-track interferometric synthetic aperture radar (SAR) and a bedrock topography derived from an airborne 60 MHz ice-penetrating radar. The extent of the delineation was calculated from a water-pressure potential as a function of the ice-sheet surface and bedrock elevations and a hydraulic factor κ describing the relative importance of the potential of the ice overburden pressure compared to the bedrock topography. The meltwater run-off for the basin delineations was modelled with an energy-balance model calibrated with observed ice-sheet ablation and compared to a 25 year time series of measured basin run-off. The standard DEMs were found to be inadequate for delineation purposes, whereas delineations from high-resolution data were found to be very sensitive to changes in κ in a non-linear way, causing a factor 5 change of basin area, corresponding to a doubling of the modelled runoff. The 50{\%} standard deviation of the measured basin run-off could thus be explained by small year-to-year variations of the κ-factor",
author = "Ahlstr{\o}m, {Andreas P.} and C.E. B{\o}ggild and L. Stenseng and Mohr, {Johan Jacob} and Niels Reeh and Christensen, {Erik Lintz} and O.B. Olesen and K. Keller",
year = "2002",
doi = "10.3189/172756402781817860",
language = "English",
volume = "34",
pages = "309--314",
journal = "Annals of Glaciology",
issn = "0260-3055",
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Mapping of a Hydrological Ice Sheet Drainage Basin on the West Greenland Ice Sheet Margin from ERS-1/2 SAR Interferometry, Ice-Radar Measurement, and Modelling. / Ahlstrøm, Andreas P.; Bøggild, C.E.; Stenseng, L.; Mohr, Johan Jacob; Reeh, Niels; Christensen, Erik Lintz; Olesen, O.B.; Keller, K.

In: Annals of Glaciology, Vol. 34, 2002, p. 309-314.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Mapping of a Hydrological Ice Sheet Drainage Basin on the West Greenland Ice Sheet Margin from ERS-1/2 SAR Interferometry, Ice-Radar Measurement, and Modelling

AU - Ahlstrøm, Andreas P.

AU - Bøggild, C.E.

AU - Stenseng, L.

AU - Mohr, Johan Jacob

AU - Reeh, Niels

AU - Christensen, Erik Lintz

AU - Olesen, O.B.

AU - Keller, K.

PY - 2002

Y1 - 2002

N2 - The hydrological ice-sheet basin draining into the Tasersiaq lake, West Greenland (66°13'N, 50°30'W), was delineated, First using standard digital elevation models (DEMs) for ice-sheet surface and bedrock, and subsequently using a new high-resolution dataset, with a surface DEM derived from repeat-track interferometric synthetic aperture radar (SAR) and a bedrock topography derived from an airborne 60 MHz ice-penetrating radar. The extent of the delineation was calculated from a water-pressure potential as a function of the ice-sheet surface and bedrock elevations and a hydraulic factor κ describing the relative importance of the potential of the ice overburden pressure compared to the bedrock topography. The meltwater run-off for the basin delineations was modelled with an energy-balance model calibrated with observed ice-sheet ablation and compared to a 25 year time series of measured basin run-off. The standard DEMs were found to be inadequate for delineation purposes, whereas delineations from high-resolution data were found to be very sensitive to changes in κ in a non-linear way, causing a factor 5 change of basin area, corresponding to a doubling of the modelled runoff. The 50% standard deviation of the measured basin run-off could thus be explained by small year-to-year variations of the κ-factor

AB - The hydrological ice-sheet basin draining into the Tasersiaq lake, West Greenland (66°13'N, 50°30'W), was delineated, First using standard digital elevation models (DEMs) for ice-sheet surface and bedrock, and subsequently using a new high-resolution dataset, with a surface DEM derived from repeat-track interferometric synthetic aperture radar (SAR) and a bedrock topography derived from an airborne 60 MHz ice-penetrating radar. The extent of the delineation was calculated from a water-pressure potential as a function of the ice-sheet surface and bedrock elevations and a hydraulic factor κ describing the relative importance of the potential of the ice overburden pressure compared to the bedrock topography. The meltwater run-off for the basin delineations was modelled with an energy-balance model calibrated with observed ice-sheet ablation and compared to a 25 year time series of measured basin run-off. The standard DEMs were found to be inadequate for delineation purposes, whereas delineations from high-resolution data were found to be very sensitive to changes in κ in a non-linear way, causing a factor 5 change of basin area, corresponding to a doubling of the modelled runoff. The 50% standard deviation of the measured basin run-off could thus be explained by small year-to-year variations of the κ-factor

U2 - 10.3189/172756402781817860

DO - 10.3189/172756402781817860

M3 - Journal article

VL - 34

SP - 309

EP - 314

JO - Annals of Glaciology

JF - Annals of Glaciology

SN - 0260-3055

ER -