Calibrated relative sea levels constrain isostatic adjustment and ice history in northwest Greenland

Anna Glueder; Alan C. Mix; Glenn A. Milne; Brendan T. Reilly; Jorie Clark; Martin Jakobsson; Larry Mayer; Stewart J. Fallon; John Southon; June Padman; Andrew Ross; Thomas Cronin; Jennifer L. McKay

doi:10.1016/j.quascirev.2022.107700

Calibrated relative sea levels constrain isostatic adjustment and ice history in northwest Greenland

Anna Glueder^*, Alan C. Mix, Glenn A. Milne, Brendan T. Reilly, Jorie Clark, Martin Jakobsson, Larry Mayer, Stewart J. Fallon, John Southon, June Padman, Andrew Ross, Thomas Cronin, Jennifer L. McKay

^*Corresponding author for this work

Climate and Ocean Geoscience

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Relative Sea Levels (RSLs) derived primarily from marine bivalves near Petermann Glacier, NW Greenland, constrain past regional ice-mass changes through glacial isostatic adjustment (GIA) modeling. Oxygen isotopes measured on bivalves corrected for shell-depth habitat and document changing meltwater input. Rapid RSL fall of up to 62 m/kyr indicates ice loss at or prior to ∼9 ka. Transition to an RSL stillstand starting at ∼6 ka reflects renewed ice-mass loading followed by further mass loss over the past few millennia. GIA simulations of rapid early RSL fall suggest a low regional upper-mantle viscosity. Early loss of grounded ice tracks atmospheric warming and pre-dates the eventual collapse of Petermann Glacier's floating ice tongue near ∼7 ka, suggesting grounding zone stabilization during early phases of deglaciation. We hypothesize mid-Holocene regrowth of regional ice caps in response to cooling and increased precipitation, following loss of the floating shelf ice. Remnants of these ice caps remain present but are now melting.

Original language	English
Article number	107700
Journal	Quaternary Science Reviews
Volume	293
DOIs	https://doi.org/10.1016/j.quascirev.2022.107700
Publication status	Published - 1 Oct 2022

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Glueder, A., Mix, A. C., Milne, G. A., Reilly, B. T., Clark, J., Jakobsson, M., Mayer, L., Fallon, S. J., Southon, J., Padman, J., Ross, A., Cronin, T., & McKay, J. L. (2022). Calibrated relative sea levels constrain isostatic adjustment and ice history in northwest Greenland. Quaternary Science Reviews, 293, Article 107700. https://doi.org/10.1016/j.quascirev.2022.107700

@article{21f244c029aa4c43b1f7f02384c95e5b,

title = "Calibrated relative sea levels constrain isostatic adjustment and ice history in northwest Greenland",

abstract = "Relative Sea Levels (RSLs) derived primarily from marine bivalves near Petermann Glacier, NW Greenland, constrain past regional ice-mass changes through glacial isostatic adjustment (GIA) modeling. Oxygen isotopes measured on bivalves corrected for shell-depth habitat and document changing meltwater input. Rapid RSL fall of up to 62 m/kyr indicates ice loss at or prior to ∼9 ka. Transition to an RSL stillstand starting at ∼6 ka reflects renewed ice-mass loading followed by further mass loss over the past few millennia. GIA simulations of rapid early RSL fall suggest a low regional upper-mantle viscosity. Early loss of grounded ice tracks atmospheric warming and pre-dates the eventual collapse of Petermann Glacier's floating ice tongue near ∼7 ka, suggesting grounding zone stabilization during early phases of deglaciation. We hypothesize mid-Holocene regrowth of regional ice caps in response to cooling and increased precipitation, following loss of the floating shelf ice. Remnants of these ice caps remain present but are now melting.",

keywords = "Bivalves, Glacio-isostatic adjustment, Holocene thermal maximum, Petermann glacier, Relative sea-level, Sea level index points",

author = "Anna Glueder and Mix, {Alan C.} and Milne, {Glenn A.} and Reilly, {Brendan T.} and Jorie Clark and Martin Jakobsson and Larry Mayer and Fallon, {Stewart J.} and John Southon and June Padman and Andrew Ross and Thomas Cronin and McKay, {Jennifer L.}",

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year = "2022",

month = oct,

day = "1",

doi = "10.1016/j.quascirev.2022.107700",

language = "English",

volume = "293",

journal = "Quaternary Science Reviews",

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T1 - Calibrated relative sea levels constrain isostatic adjustment and ice history in northwest Greenland

AU - Glueder, Anna

AU - Mix, Alan C.

AU - Milne, Glenn A.

AU - Reilly, Brendan T.

AU - Clark, Jorie

AU - Jakobsson, Martin

AU - Mayer, Larry

AU - Fallon, Stewart J.

AU - Southon, John

AU - Padman, June

AU - Ross, Andrew

AU - Cronin, Thomas

AU - McKay, Jennifer L.

PY - 2022/10/1

Y1 - 2022/10/1

N2 - Relative Sea Levels (RSLs) derived primarily from marine bivalves near Petermann Glacier, NW Greenland, constrain past regional ice-mass changes through glacial isostatic adjustment (GIA) modeling. Oxygen isotopes measured on bivalves corrected for shell-depth habitat and document changing meltwater input. Rapid RSL fall of up to 62 m/kyr indicates ice loss at or prior to ∼9 ka. Transition to an RSL stillstand starting at ∼6 ka reflects renewed ice-mass loading followed by further mass loss over the past few millennia. GIA simulations of rapid early RSL fall suggest a low regional upper-mantle viscosity. Early loss of grounded ice tracks atmospheric warming and pre-dates the eventual collapse of Petermann Glacier's floating ice tongue near ∼7 ka, suggesting grounding zone stabilization during early phases of deglaciation. We hypothesize mid-Holocene regrowth of regional ice caps in response to cooling and increased precipitation, following loss of the floating shelf ice. Remnants of these ice caps remain present but are now melting.

AB - Relative Sea Levels (RSLs) derived primarily from marine bivalves near Petermann Glacier, NW Greenland, constrain past regional ice-mass changes through glacial isostatic adjustment (GIA) modeling. Oxygen isotopes measured on bivalves corrected for shell-depth habitat and document changing meltwater input. Rapid RSL fall of up to 62 m/kyr indicates ice loss at or prior to ∼9 ka. Transition to an RSL stillstand starting at ∼6 ka reflects renewed ice-mass loading followed by further mass loss over the past few millennia. GIA simulations of rapid early RSL fall suggest a low regional upper-mantle viscosity. Early loss of grounded ice tracks atmospheric warming and pre-dates the eventual collapse of Petermann Glacier's floating ice tongue near ∼7 ka, suggesting grounding zone stabilization during early phases of deglaciation. We hypothesize mid-Holocene regrowth of regional ice caps in response to cooling and increased precipitation, following loss of the floating shelf ice. Remnants of these ice caps remain present but are now melting.

KW - Bivalves

KW - Glacio-isostatic adjustment

KW - Holocene thermal maximum

KW - Petermann glacier

KW - Relative sea-level

KW - Sea level index points

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U2 - 10.1016/j.quascirev.2022.107700

DO - 10.1016/j.quascirev.2022.107700

M3 - Article

SN - 0277-3791

VL - 293

JO - Quaternary Science Reviews

JF - Quaternary Science Reviews

M1 - 107700

ER -

Calibrated relative sea levels constrain isostatic adjustment and ice history in northwest Greenland

Abstract

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