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

Michael Bevis; John Wahr; Shfaqat Abbas Khan; Finn Bo Madsen; Abel Brown; Michael Willis; Eric Kendrick; Per Knudsen; Jason E. Box; Tonie van Dam; Dana J., II Caccamise; Bjorn Johns; Thomas Nylen; Robin Abbott; Seth White; Jeremy Miner; René Forsberg; Hao Zhou; Jian Wang; Terry Wilson; David Bromwich; Olivier Francis

doi:10.1073/pnas.1204664109

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

Michael Bevis, John Wahr, Shfaqat Abbas Khan, Finn Bo Madsen, Abel Brown, Michael Willis, Eric Kendrick, Per Knudsen, Jason E. Box, Tonie van Dam, Dana J., II Caccamise, Bjorn Johns, Thomas Nylen, Robin Abbott, Seth White, Jeremy Miner, René Forsberg, Hao Zhou, Jian Wang, Terry WilsonDavid Bromwich, Olivier Francis

National Space Institute

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

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.

Original language	English
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	109
Issue number	30
Pages (from-to)	11944-11948
ISSN	0027-8424
DOIs	https://doi.org/10.1073/pnas.1204664109
Publication status	Published - 2012

Keywords

Climate change
Climate cycles
Elasticity
Crustal motion geodesy

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Bevis, M., Wahr, J., Khan, S. A., Madsen, F. B., Brown, A., Willis, M., Kendrick, E., Knudsen, P., Box, J. E., van Dam, T., Caccamise, D. J. . II., Johns, B., Nylen, T., Abbott, R., White, S., Miner, J., Forsberg, R., Zhou, H., Wang, J., ... Francis, O. (2012). Bedrock displacements in Greenland manifest ice mass variations, climate cycles and climate change. Proceedings of the National Academy of Sciences of the United States of America, 109(30), 11944-11948. https://doi.org/10.1073/pnas.1204664109

Bevis, Michael ; Wahr, John ; Khan, Shfaqat Abbas ; Madsen, Finn Bo ; Brown, Abel ; Willis, Michael ; Kendrick, Eric ; Knudsen, Per ; Box, Jason E. ; van Dam, Tonie ; Caccamise, Dana J., II ; Johns, Bjorn ; Nylen, Thomas ; Abbott, Robin ; White, Seth ; Miner, Jeremy ; Forsberg, René ; Zhou, Hao ; Wang, Jian ; Wilson, Terry ; Bromwich, David ; Francis, Olivier. / Bedrock displacements in Greenland manifest ice mass variations, climate cycles and climate change. In: Proceedings of the National Academy of Sciences of the United States of America. 2012 ; Vol. 109, No. 30. pp. 11944-11948.

@article{07f578295c504c57bba7afe17d95830e,

title = "Bedrock displacements in Greenland manifest ice mass variations, climate cycles and climate change",

abstract = "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{\textquoteright}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{\textquoteright}s instantaneous elastic response to contemporary losses in ice mass rather than PGR. Superimposed on longer-term trends, an anomalous {\textquoteleft}pulse{\textquoteright} 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.",

keywords = "Climate change, Climate cycles, Elasticity, Crustal motion geodesy",

author = "Michael Bevis and John Wahr and Khan, {Shfaqat Abbas} and Madsen, {Finn Bo} and Abel Brown and Michael Willis and Eric Kendrick and Per Knudsen and Box, {Jason E.} and {van Dam}, Tonie and Caccamise, {Dana J., II} and Bjorn Johns and Thomas Nylen and Robin Abbott and Seth White and Jeremy Miner and Ren{\'e} Forsberg and Hao Zhou and Jian Wang and Terry Wilson and David Bromwich and Olivier Francis",

year = "2012",

doi = "10.1073/pnas.1204664109",

language = "English",

volume = "109",

pages = "11944--11948",

journal = "Proceedings of the National Academy of Sciences of the United States of America",

issn = "0027-8424",

publisher = "The National Academy of Sciences of the United States of America",

number = "30",

}

Bevis, M, Wahr, J, Khan, SA , Madsen, FB, Brown, A, Willis, M, Kendrick, E, Knudsen, P, Box, JE, van Dam, T, Caccamise, DJII, Johns, B, Nylen, T, Abbott, R, White, S, Miner, J, Forsberg, R, Zhou, H, Wang, J, Wilson, T, Bromwich, D & Francis, O 2012, 'Bedrock displacements in Greenland manifest ice mass variations, climate cycles and climate change', Proceedings of the National Academy of Sciences of the United States of America, vol. 109, no. 30, pp. 11944-11948. https://doi.org/10.1073/pnas.1204664109

Bedrock displacements in Greenland manifest ice mass variations, climate cycles and climate change. / Bevis, Michael; Wahr, John; Khan, Shfaqat Abbas ; Madsen, Finn Bo; Brown, Abel; Willis, Michael; Kendrick, Eric; Knudsen, Per; Box, Jason E.; van Dam, Tonie; Caccamise, Dana J., II; Johns, Bjorn; Nylen, Thomas; Abbott, Robin; White, Seth; Miner, Jeremy; Forsberg, René; Zhou, Hao; Wang, Jian; Wilson, Terry; Bromwich, David; Francis, Olivier.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 109, No. 30, 2012, p. 11944-11948.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

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

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

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

M3 - Journal article

VL - 109

SP - 11944

EP - 11948

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

SN - 0027-8424

IS - 30

ER -