Rapid dynamic thinning on Upernavik Icestream, West Greenland

Shfaqat Abbas Khan, Kurt H. Kjær, Niels Jákup Korsgaard, Bea M Csatho, Ian R Joughin, Jonathan L Bamber, Lars Hjortborg Timm, John M Wahr

Research output: Contribution to journalConference abstract in journalResearch

Abstract

The main outlet glaciers in Greenland have more than doubled their contribution to global sea level rise over the last decade. Several studies have shown increase in ice discharge from the main outlet glaciers (notably Kangerdlugssuaq (KG) and Helheim glaciers (HG) in Southeast Greenland, and Jakobshavn Isbræ (JI) in West
Greenland) as a result of significant accelerations in flow speed. The situation across Greenland continues to evolve. Evidence from GRACE (Velicogna, 2009), GPS (Khan, 2010) and ICESat (Pritchard, 2009) suggest that there is an ongoing northward migration of increasing ice loss. Here, we focus on Upernavik Icesteam, Northwest Greenland, and show that dynamic thinning on short timescales has been dominating the region at least twice between 1985 and 2010. We map changes on Upernavik Icesteram during 2003-2009 using high-resolution ICESat (Ice, Cloud and land Elevation Satellite) laser altimetry data supplemented with altimeter surveys from NASA’s Airborne Topographic Mapper (ATM). To assess thinning prior to 2003, we analyze 1985 aerial photos
and derived a 2x2 m grid digital elevation model (DEM).
Original languageEnglish
JournalGeophysical Research Abstracts
Volume13
ISSN1607-7962
Publication statusPublished - 2011
EventEuropean Geosciences Union General Assembly 2011 - Vienna, Austria
Duration: 3 Apr 20118 Apr 2011
http://meetings.copernicus.org/egu2011/home.html

Conference

ConferenceEuropean Geosciences Union General Assembly 2011
CountryAustria
CityVienna
Period03/04/201108/04/2011
Internet address

Cite this

Khan, S. A., Kjær, K. H., Korsgaard, N. J., Csatho, B. M., Joughin, I. R., Bamber, J. L., ... Wahr, J. M. (2011). Rapid dynamic thinning on Upernavik Icestream, West Greenland. Geophysical Research Abstracts, 13.
Khan, Shfaqat Abbas ; Kjær, Kurt H. ; Korsgaard, Niels Jákup ; Csatho, Bea M ; Joughin, Ian R ; Bamber, Jonathan L ; Hjortborg Timm, Lars ; Wahr, John M. / Rapid dynamic thinning on Upernavik Icestream, West Greenland. In: Geophysical Research Abstracts. 2011 ; Vol. 13.
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title = "Rapid dynamic thinning on Upernavik Icestream, West Greenland",
abstract = "The main outlet glaciers in Greenland have more than doubled their contribution to global sea level rise over the last decade. Several studies have shown increase in ice discharge from the main outlet glaciers (notably Kangerdlugssuaq (KG) and Helheim glaciers (HG) in Southeast Greenland, and Jakobshavn Isbr{\ae} (JI) in WestGreenland) as a result of significant accelerations in flow speed. The situation across Greenland continues to evolve. Evidence from GRACE (Velicogna, 2009), GPS (Khan, 2010) and ICESat (Pritchard, 2009) suggest that there is an ongoing northward migration of increasing ice loss. Here, we focus on Upernavik Icesteam, Northwest Greenland, and show that dynamic thinning on short timescales has been dominating the region at least twice between 1985 and 2010. We map changes on Upernavik Icesteram during 2003-2009 using high-resolution ICESat (Ice, Cloud and land Elevation Satellite) laser altimetry data supplemented with altimeter surveys from NASA’s Airborne Topographic Mapper (ATM). To assess thinning prior to 2003, we analyze 1985 aerial photosand derived a 2x2 m grid digital elevation model (DEM).",
author = "Khan, {Shfaqat Abbas} and Kj{\ae}r, {Kurt H.} and Korsgaard, {Niels J{\'a}kup} and Csatho, {Bea M} and Joughin, {Ian R} and Bamber, {Jonathan L} and {Hjortborg Timm}, Lars and Wahr, {John M}",
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Khan, SA, Kjær, KH, Korsgaard, NJ, Csatho, BM, Joughin, IR, Bamber, JL, Hjortborg Timm, L & Wahr, JM 2011, 'Rapid dynamic thinning on Upernavik Icestream, West Greenland', Geophysical Research Abstracts, vol. 13.

Rapid dynamic thinning on Upernavik Icestream, West Greenland. / Khan, Shfaqat Abbas; Kjær, Kurt H.; Korsgaard, Niels Jákup; Csatho, Bea M; Joughin, Ian R; Bamber, Jonathan L; Hjortborg Timm, Lars; Wahr, John M.

In: Geophysical Research Abstracts, Vol. 13, 2011.

Research output: Contribution to journalConference abstract in journalResearch

TY - ABST

T1 - Rapid dynamic thinning on Upernavik Icestream, West Greenland

AU - Khan, Shfaqat Abbas

AU - Kjær, Kurt H.

AU - Korsgaard, Niels Jákup

AU - Csatho, Bea M

AU - Joughin, Ian R

AU - Bamber, Jonathan L

AU - Hjortborg Timm, Lars

AU - Wahr, John M

PY - 2011

Y1 - 2011

N2 - The main outlet glaciers in Greenland have more than doubled their contribution to global sea level rise over the last decade. Several studies have shown increase in ice discharge from the main outlet glaciers (notably Kangerdlugssuaq (KG) and Helheim glaciers (HG) in Southeast Greenland, and Jakobshavn Isbræ (JI) in WestGreenland) as a result of significant accelerations in flow speed. The situation across Greenland continues to evolve. Evidence from GRACE (Velicogna, 2009), GPS (Khan, 2010) and ICESat (Pritchard, 2009) suggest that there is an ongoing northward migration of increasing ice loss. Here, we focus on Upernavik Icesteam, Northwest Greenland, and show that dynamic thinning on short timescales has been dominating the region at least twice between 1985 and 2010. We map changes on Upernavik Icesteram during 2003-2009 using high-resolution ICESat (Ice, Cloud and land Elevation Satellite) laser altimetry data supplemented with altimeter surveys from NASA’s Airborne Topographic Mapper (ATM). To assess thinning prior to 2003, we analyze 1985 aerial photosand derived a 2x2 m grid digital elevation model (DEM).

AB - The main outlet glaciers in Greenland have more than doubled their contribution to global sea level rise over the last decade. Several studies have shown increase in ice discharge from the main outlet glaciers (notably Kangerdlugssuaq (KG) and Helheim glaciers (HG) in Southeast Greenland, and Jakobshavn Isbræ (JI) in WestGreenland) as a result of significant accelerations in flow speed. The situation across Greenland continues to evolve. Evidence from GRACE (Velicogna, 2009), GPS (Khan, 2010) and ICESat (Pritchard, 2009) suggest that there is an ongoing northward migration of increasing ice loss. Here, we focus on Upernavik Icesteam, Northwest Greenland, and show that dynamic thinning on short timescales has been dominating the region at least twice between 1985 and 2010. We map changes on Upernavik Icesteram during 2003-2009 using high-resolution ICESat (Ice, Cloud and land Elevation Satellite) laser altimetry data supplemented with altimeter surveys from NASA’s Airborne Topographic Mapper (ATM). To assess thinning prior to 2003, we analyze 1985 aerial photosand derived a 2x2 m grid digital elevation model (DEM).

M3 - Conference abstract in journal

VL - 13

JO - Geophysical Research Abstracts

JF - Geophysical Research Abstracts

SN - 1607-7962

ER -

Khan SA, Kjær KH, Korsgaard NJ, Csatho BM, Joughin IR, Bamber JL et al. Rapid dynamic thinning on Upernavik Icestream, West Greenland. Geophysical Research Abstracts. 2011;13.