Basin-scale partitioning of Greenland ice sheet mass balance components (2007-2011)

M. L. Andersen; L. Stenseng; H. Skourup; W. Colgan; S. A. Khan; S. S. Kristensen; S. B. Andersen; J. E. Box; A. P. Ahlstrøm; X. Fettweis; R. Forsberg

doi:10.1016/j.epsl.2014.10.015

Basin-scale partitioning of Greenland ice sheet mass balance components (2007-2011)

M. L. Andersen^*, L. Stenseng, H. Skourup, W. Colgan, S. A. Khan, S. S. Kristensen, S. B. Andersen, J. E. Box, A. P. Ahlstrøm, X. Fettweis, R. Forsberg

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59 Citationer (Scopus)

Abstract

The current deficit in Greenland ice sheet mass balance is due to both a decrease in surface mass balance (SMB) input and an increase in ice discharge (D) output. While SMB processes are beginning to be well captured by observationally-constrained climate modeling, insight into D is relatively limited. We use InSAR-derived velocities, in combination with ice thickness observations, to quantify the mass flux (F) across a flux perimeter around the ice sheet at ~1700 m elevation. To quantify D, we correct F for SMB, as well as changes in volume due to ice dynamics, in the area downstream of the gate. Using a 1961-1990 reference climatology SMB field from the MAR regional climate model, we quantify ice sheet mass balance within eighteen basins. We find a 2007-2011 mean D of 515±57 Gtyr ^-1 . We find a 2007-2011 mean total mass balance of -262±21 Gtyr ^-1 , which is equal to a 0.73 mm yr ^-1 global sea level rise contribution. This mass loss is dominated by SMB, which accounts for 61% of mass loss in the basins where partitioning is possible.

Originalsprog	Engelsk
Tidsskrift	Earth and Planetary Science Letters
Vol/bind	409
Sider (fra-til)	89-95
Antal sider	7
ISSN	0012-821X
DOI	https://doi.org/10.1016/j.epsl.2014.10.015
Status	Udgivet - 1 jan. 2015
Udgivet eksternt	Ja

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10.1016/j.epsl.2014.10.015

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Citationsformater

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title = "Basin-scale partitioning of Greenland ice sheet mass balance components (2007-2011)",

abstract = " The current deficit in Greenland ice sheet mass balance is due to both a decrease in surface mass balance (SMB) input and an increase in ice discharge (D) output. While SMB processes are beginning to be well captured by observationally-constrained climate modeling, insight into D is relatively limited. We use InSAR-derived velocities, in combination with ice thickness observations, to quantify the mass flux (F) across a flux perimeter around the ice sheet at ~1700 m elevation. To quantify D, we correct F for SMB, as well as changes in volume due to ice dynamics, in the area downstream of the gate. Using a 1961-1990 reference climatology SMB field from the MAR regional climate model, we quantify ice sheet mass balance within eighteen basins. We find a 2007-2011 mean D of 515±57 Gtyr -1 . We find a 2007-2011 mean total mass balance of -262±21 Gtyr -1 , which is equal to a 0.73 mm yr -1 global sea level rise contribution. This mass loss is dominated by SMB, which accounts for 61% of mass loss in the basins where partitioning is possible. ",

keywords = "Airborne survey, Flux gate, Greenland ice sheet, Ice discharge, Mass loss partition, Surface mass balance",

author = "Andersen, {M. L.} and L. Stenseng and H. Skourup and W. Colgan and Khan, {S. A.} and Kristensen, {S. S.} and Andersen, {S. B.} and Box, {J. E.} and Ahlstr{\o}m, {A. P.} and X. Fettweis and R. Forsberg",

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TY - JOUR

T1 - Basin-scale partitioning of Greenland ice sheet mass balance components (2007-2011)

AU - Andersen, M. L.

AU - Stenseng, L.

AU - Skourup, H.

AU - Colgan, W.

AU - Khan, S. A.

AU - Kristensen, S. S.

AU - Andersen, S. B.

AU - Box, J. E.

AU - Ahlstrøm, A. P.

AU - Fettweis, X.

AU - Forsberg, R.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - The current deficit in Greenland ice sheet mass balance is due to both a decrease in surface mass balance (SMB) input and an increase in ice discharge (D) output. While SMB processes are beginning to be well captured by observationally-constrained climate modeling, insight into D is relatively limited. We use InSAR-derived velocities, in combination with ice thickness observations, to quantify the mass flux (F) across a flux perimeter around the ice sheet at ~1700 m elevation. To quantify D, we correct F for SMB, as well as changes in volume due to ice dynamics, in the area downstream of the gate. Using a 1961-1990 reference climatology SMB field from the MAR regional climate model, we quantify ice sheet mass balance within eighteen basins. We find a 2007-2011 mean D of 515±57 Gtyr -1 . We find a 2007-2011 mean total mass balance of -262±21 Gtyr -1 , which is equal to a 0.73 mm yr -1 global sea level rise contribution. This mass loss is dominated by SMB, which accounts for 61% of mass loss in the basins where partitioning is possible.

AB - The current deficit in Greenland ice sheet mass balance is due to both a decrease in surface mass balance (SMB) input and an increase in ice discharge (D) output. While SMB processes are beginning to be well captured by observationally-constrained climate modeling, insight into D is relatively limited. We use InSAR-derived velocities, in combination with ice thickness observations, to quantify the mass flux (F) across a flux perimeter around the ice sheet at ~1700 m elevation. To quantify D, we correct F for SMB, as well as changes in volume due to ice dynamics, in the area downstream of the gate. Using a 1961-1990 reference climatology SMB field from the MAR regional climate model, we quantify ice sheet mass balance within eighteen basins. We find a 2007-2011 mean D of 515±57 Gtyr -1 . We find a 2007-2011 mean total mass balance of -262±21 Gtyr -1 , which is equal to a 0.73 mm yr -1 global sea level rise contribution. This mass loss is dominated by SMB, which accounts for 61% of mass loss in the basins where partitioning is possible.

KW - Airborne survey

KW - Flux gate

KW - Greenland ice sheet

KW - Ice discharge

KW - Mass loss partition

KW - Surface mass balance

UR - http://www.scopus.com/inward/record.url?scp=84910682257&partnerID=8YFLogxK

U2 - 10.1016/j.epsl.2014.10.015

DO - 10.1016/j.epsl.2014.10.015

M3 - Journal article

AN - SCOPUS:84910682257

SN - 0012-821X

VL - 409

SP - 89

EP - 95

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

ER -

Basin-scale partitioning of Greenland ice sheet mass balance components (2007-2011)

Abstract

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