TY - JOUR

T1 - Bedrock displacements in Greenland manifest ice mass variations, climate cycles and climate change

A1 - Bevis,Michael

A1 - Wahr,John

A1 - Khan,Shfaqat Abbas

A1 - Madsen,Finn Bo

A1 - Brown,Abel

A1 - Willis,Michael

A1 - Kendrick,Eric

A1 - Knudsen,Per

A1 - Box,Jason E.

A1 - van Dam,Tonie

A1 - Caccamise,Dana J., II

A1 - Johns,Bjorn

A1 - Nylen,Thomas

A1 - Abbott,Robin

A1 - White,Seth

A1 - Miner,Jeremy

A1 - Forsberg,René

A1 - Zhou,Hao

A1 - Wang,Jian

A1 - Wilson,Terry

A1 - Bromwich,David

A1 - Francis,Olivier

AU - Bevis,Michael

AU - Wahr,John

AU - Khan,Shfaqat Abbas

AU - Madsen,Finn Bo

AU - Brown,Abel

AU - Willis,Michael

AU - Kendrick,Eric

AU - Knudsen,Per

AU - Box,Jason E.

AU - van Dam,Tonie

AU - Caccamise,Dana J., II

AU - Johns,Bjorn

AU - Nylen,Thomas

AU - Abbott,Robin

AU - White,Seth

AU - Miner,Jeremy

AU - Forsberg,René

AU - Zhou,Hao

AU - Wang,Jian

AU - Wilson,Terry

AU - Bromwich,David

AU - Francis,Olivier

PB - National Academy of Sciences

PY - 2012

Y1 - 2012

N2 - The Greenland GPS Network (GNET) uses the Global Positioning System (GPS) to measure the displacement of bedrock exposed near the margins of the Greenland ice sheet. The entire network is uplifting in response to past and present-day changes in ice mass. Crustal displacement is largely accounted for by an annual oscillation superimposed on a sustained trend. The oscillation is driven by earth’s elastic response to seasonal variations in ice mass and air mass (i.e., atmospheric pressure). Observed vertical velocities are higher and often much higher than predicted rates of postglacial rebound (PGR), implying that uplift is usually dominated by the solid earth’s instantaneous elastic response to contemporary losses in ice mass rather than PGR. Superimposed on longer-term trends, an anomalous ‘pulse’ of uplift accumulated at many GNET stations during an approximate six-month period in 2010. This anomalous uplift is spatially correlated with the 2010 melting day anomaly.

AB - The Greenland GPS Network (GNET) uses the Global Positioning System (GPS) to measure the displacement of bedrock exposed near the margins of the Greenland ice sheet. The entire network is uplifting in response to past and present-day changes in ice mass. Crustal displacement is largely accounted for by an annual oscillation superimposed on a sustained trend. The oscillation is driven by earth’s elastic response to seasonal variations in ice mass and air mass (i.e., atmospheric pressure). Observed vertical velocities are higher and often much higher than predicted rates of postglacial rebound (PGR), implying that uplift is usually dominated by the solid earth’s instantaneous elastic response to contemporary losses in ice mass rather than PGR. Superimposed on longer-term trends, an anomalous ‘pulse’ of uplift accumulated at many GNET stations during an approximate six-month period in 2010. This anomalous uplift is spatially correlated with the 2010 melting day anomaly.

KW - Climate change

KW - Climate cycles

KW - Elasticity

KW - Crustal motion geodesy

U2 - 10.1073/pnas.1204664109

DO - 10.1073/pnas.1204664109

JO - National Academy of Sciences. Proceedings

JF - National Academy of Sciences. Proceedings

SN - 0027-8424

IS - 30

VL - 109

SP - 11944

EP - 11948

ER -