Recurring dynamically induced thinning during 1985-2010 on Upernavik Isstrøm, West Greenland

Shfaqat Abbas Khan; Kurt H. Kjær; Niels Jákup Korsgaard; John Wahr; Ian R. Joughin; Lars H. Timm; Jonathan L Bamber; Michiel R. van den Broeke; Leigh A. Stearns; Gordon S. Hamilton; Bea M. Csatho; Karina Nielsen; Ruud Hurkmans; Greg Babonis

doi:10.1029/2012jf002481

Recurring dynamically induced thinning during 1985-2010 on Upernavik Isstrøm, West Greenland

Shfaqat Abbas Khan, Kurt H. Kjær, Niels Jákup Korsgaard, John Wahr, Ian R. Joughin, Lars H. Timm, Jonathan L Bamber, Michiel R. van den Broeke, Leigh A. Stearns, Gordon S. Hamilton, Bea M. Csatho, Karina Nielsen, Ruud Hurkmans, Greg Babonis

22 Citationer (Scopus)

Abstract

Many glaciers along the southeast and northwest coasts of Greenland have accelerated, increasing the ice sheet's contribution to global sea-level rise. In this article, we map elevation changes on Upernavik Isstrøm (UI), West Greenland, during 2003to 2009 using high-resolution ice, cloud and land elevation satellite laser altimeter data supplemented with altimeter surveys from NASA's Airborne Topographic Mapper during 2002 to 2010. To assess thinning prior to 2002, we analyze aerial photographs from 1985. We document at least two distinct periods of dynamically induced ice loss during 1985 to 2010 characterized by a rapid retreat of the calving front, increased ice speed, and lowering of the ice surface. The first period occurred before 1991, whereas the latter occurred during 2005 to 2009. Analyses of air and sea-surface temperature suggest a combination of relatively warm air and ocean water as a potential trigger for the dynamically induced ice loss. We estimate a total catchment-wide ice-mass loss of UI caused by the two events of 72.3 ± 15.8 Gt during 1985 to 2010, whereas the total melt-induced ice-mass loss during this same period is 19.8 ± 2.8 Gt. Thus, 79% of the total ice-mass loss of the UI catchment was caused by ice dynamics, indicating the importance of including dynamically induced ice loss in the total mass change budget of the Greenland ice sheet.

Originalsprog	Engelsk
Tidsskrift	Journal of Geophysical Research: Earth Surface
Vol/bind	118
Udgave nummer	1
Sider (fra-til)	111–121
Antal sider	11
ISSN	2169-9003
DOI	https://doi.org/10.1029/2012jf002481
Status	Udgivet - 1 mar. 2013

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10.1029/2012jf002481

2012JF002481Forlagets udgivne version, 11 MB

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Khan, S. A., Kjær, K. H., Korsgaard, N. J., Wahr, J., Joughin, I. R., Timm, L. H., Bamber, J. L., van den Broeke, M. R., Stearns, L. A., Hamilton, G. S., Csatho, B. M., Nielsen, K., Hurkmans, R., & Babonis, G. (2013). Recurring dynamically induced thinning during 1985-2010 on Upernavik Isstrøm, West Greenland. Journal of Geophysical Research: Earth Surface, 118(1), 111–121. https://doi.org/10.1029/2012jf002481

Khan, SA, Kjær, KH, Korsgaard, NJ, Wahr, J, Joughin, IR, Timm, LH, Bamber, JL, van den Broeke, MR, Stearns, LA, Hamilton, GS, Csatho, BM, Nielsen, K, Hurkmans, R & Babonis, G 2013, 'Recurring dynamically induced thinning during 1985-2010 on Upernavik Isstrøm, West Greenland', Journal of Geophysical Research: Earth Surface, bind 118, nr. 1, s. 111–121. https://doi.org/10.1029/2012jf002481

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title = "Recurring dynamically induced thinning during 1985-2010 on Upernavik Isstr{\o}m, West Greenland",

abstract = "Many glaciers along the southeast and northwest coasts of Greenland have accelerated, increasing the ice sheet's contribution to global sea-level rise. In this article, we map elevation changes on Upernavik Isstr{\o}m (UI), West Greenland, during 2003to 2009 using high-resolution ice, cloud and land elevation satellite laser altimeter data supplemented with altimeter surveys from NASA's Airborne Topographic Mapper during 2002 to 2010. To assess thinning prior to 2002, we analyze aerial photographs from 1985. We document at least two distinct periods of dynamically induced ice loss during 1985 to 2010 characterized by a rapid retreat of the calving front, increased ice speed, and lowering of the ice surface. The first period occurred before 1991, whereas the latter occurred during 2005 to 2009. Analyses of air and sea-surface temperature suggest a combination of relatively warm air and ocean water as a potential trigger for the dynamically induced ice loss. We estimate a total catchment-wide ice-mass loss of UI caused by the two events of 72.3 ± 15.8 Gt during 1985 to 2010, whereas the total melt-induced ice-mass loss during this same period is 19.8 ± 2.8 Gt. Thus, 79% of the total ice-mass loss of the UI catchment was caused by ice dynamics, indicating the importance of including dynamically induced ice loss in the total mass change budget of the Greenland ice sheet.",

author = "Khan, {Shfaqat Abbas} and Kj{\ae}r, {Kurt H.} and Korsgaard, {Niels J{\'a}kup} and John Wahr and Joughin, {Ian R.} and Timm, {Lars H.} and Bamber, {Jonathan L} and {van den Broeke}, {Michiel R.} and Stearns, {Leigh A.} and Hamilton, {Gordon S.} and Csatho, {Bea M.} and Karina Nielsen and Ruud Hurkmans and Greg Babonis",

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doi = "10.1029/2012jf002481",

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T1 - Recurring dynamically induced thinning during 1985-2010 on Upernavik Isstrøm, West Greenland

AU - Khan, Shfaqat Abbas

AU - Kjær, Kurt H.

AU - Korsgaard, Niels Jákup

AU - Wahr, John

AU - Joughin, Ian R.

AU - Timm, Lars H.

AU - Bamber, Jonathan L

AU - van den Broeke, Michiel R.

AU - Stearns, Leigh A.

AU - Hamilton, Gordon S.

AU - Csatho, Bea M.

AU - Nielsen, Karina

AU - Hurkmans, Ruud

AU - Babonis, Greg

PY - 2013/3/1

Y1 - 2013/3/1

N2 - Many glaciers along the southeast and northwest coasts of Greenland have accelerated, increasing the ice sheet's contribution to global sea-level rise. In this article, we map elevation changes on Upernavik Isstrøm (UI), West Greenland, during 2003to 2009 using high-resolution ice, cloud and land elevation satellite laser altimeter data supplemented with altimeter surveys from NASA's Airborne Topographic Mapper during 2002 to 2010. To assess thinning prior to 2002, we analyze aerial photographs from 1985. We document at least two distinct periods of dynamically induced ice loss during 1985 to 2010 characterized by a rapid retreat of the calving front, increased ice speed, and lowering of the ice surface. The first period occurred before 1991, whereas the latter occurred during 2005 to 2009. Analyses of air and sea-surface temperature suggest a combination of relatively warm air and ocean water as a potential trigger for the dynamically induced ice loss. We estimate a total catchment-wide ice-mass loss of UI caused by the two events of 72.3 ± 15.8 Gt during 1985 to 2010, whereas the total melt-induced ice-mass loss during this same period is 19.8 ± 2.8 Gt. Thus, 79% of the total ice-mass loss of the UI catchment was caused by ice dynamics, indicating the importance of including dynamically induced ice loss in the total mass change budget of the Greenland ice sheet.

AB - Many glaciers along the southeast and northwest coasts of Greenland have accelerated, increasing the ice sheet's contribution to global sea-level rise. In this article, we map elevation changes on Upernavik Isstrøm (UI), West Greenland, during 2003to 2009 using high-resolution ice, cloud and land elevation satellite laser altimeter data supplemented with altimeter surveys from NASA's Airborne Topographic Mapper during 2002 to 2010. To assess thinning prior to 2002, we analyze aerial photographs from 1985. We document at least two distinct periods of dynamically induced ice loss during 1985 to 2010 characterized by a rapid retreat of the calving front, increased ice speed, and lowering of the ice surface. The first period occurred before 1991, whereas the latter occurred during 2005 to 2009. Analyses of air and sea-surface temperature suggest a combination of relatively warm air and ocean water as a potential trigger for the dynamically induced ice loss. We estimate a total catchment-wide ice-mass loss of UI caused by the two events of 72.3 ± 15.8 Gt during 1985 to 2010, whereas the total melt-induced ice-mass loss during this same period is 19.8 ± 2.8 Gt. Thus, 79% of the total ice-mass loss of the UI catchment was caused by ice dynamics, indicating the importance of including dynamically induced ice loss in the total mass change budget of the Greenland ice sheet.

U2 - 10.1029/2012jf002481

DO - 10.1029/2012jf002481

M3 - Journal article

SN - 0148-0227

VL - 118

SP - 111

EP - 121

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

IS - 1

ER -

Recurring dynamically induced thinning during 1985-2010 on Upernavik Isstrøm, West Greenland

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