Tracking millennial-scale Holocene glacial advance and retreat using osmium isotopes: Insights from the Greenland ice sheet

Alan D. Rooney; David Selby; Jeremy M. Lloyd; David H. Roberts; Andreas Lückge; Bradley B. Sageman; Nancy G. Prouty

doi:10.1016/j.quascirev.2016.02.021

Tracking millennial-scale Holocene glacial advance and retreat using osmium isotopes: Insights from the Greenland ice sheet

Alan D. Rooney^*, David Selby, Jeremy M. Lloyd, David H. Roberts, Andreas Lückge, Bradley B. Sageman, Nancy G. Prouty

^*Corresponding author for this work

Earth and Planetary Sciences

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

37 Scopus citations

Abstract

High-resolution Os isotope stratigraphy can aid in reconstructing Pleistocene ice sheet fluctuation and elucidating the role of local and regional weathering fluxes on the marine Os residence time. This paper presents new Os isotope data from ocean cores adjacent to the West Greenland ice sheet that have excellent chronological controls. Cores MSM-520 and DA00-06 represent distal to proximal sites adjacent to two West Greenland ice streams. Core MSM-520 has a steadily decreasing Os signal over the last 10 kyr (¹⁸⁷Os/¹⁸⁸Os = 1.35-0.81). In contrast, Os isotopes from core DA00-06 (proximal to the calving front of Jakobshavn Isbræ) highlight four stages of ice stream retreat and advance over the past 10 kyr (¹⁸⁷Os/¹⁸⁸Os = 2.31; 1.68; 2.09; 1.47). Our high-resolution chemostratigraphic records provide vital benchmarks for ice-sheet modelers as we attempt to better constrain the future response of major ice sheets to climate change. Variations in Os isotope composition from sediment and macro-algae (seaweed) sourced from regional and global settings serve to emphasize the overwhelming effect weathering sources have on seawater Os isotope composition. Further, these findings demonstrate that the residence time of Os is shorter than previous estimates of ~10⁴ yr.

Original language	English (US)
Pages (from-to)	49-61
Number of pages	13
Journal	Quaternary Science Reviews
Volume	138
DOIs	https://doi.org/10.1016/j.quascirev.2016.02.021
State	Published - Apr 15 2016

Funding

We thank Barbara Stroem-Baris, Antony Long and Sarah Woodroffe for seaweed samples and Brice Rea and Tim Lane for assistance in collecting bedrock samples. We acknowledge the Bundesministerium fuer Bildung und Forschung (BMBF, Bonn) for funding the SO139 ( 03G01390A ) and SO130 ( 03G0130A ) cruises. This paper benefited from constructive criticisms from Greg Ravizza and Bernhard Peucker-Ehrenbrink and valuable discussions with Francis Macdonald, Sierra Petersen and Alice Doughty. An anonymous reviewer and editor Neil Glasser are also thanked for improving this manuscript. Durham authors also wish to acknowledge: NERC CIAF Grant No: 9063/0409 , NERC CIAF Grant No: 9106/0411 and NERC Radiocarbon Facility Grant No: 1559.0411 .

Keywords

Greenland ice sheet
Holocene
Ocean-ice interaction
Osmium

ASJC Scopus subject areas

Global and Planetary Change
Ecology, Evolution, Behavior and Systematics
Archaeology
Archaeology
Geology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.quascirev.2016.02.021

Cite this

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title = "Tracking millennial-scale Holocene glacial advance and retreat using osmium isotopes: Insights from the Greenland ice sheet",

abstract = "High-resolution Os isotope stratigraphy can aid in reconstructing Pleistocene ice sheet fluctuation and elucidating the role of local and regional weathering fluxes on the marine Os residence time. This paper presents new Os isotope data from ocean cores adjacent to the West Greenland ice sheet that have excellent chronological controls. Cores MSM-520 and DA00-06 represent distal to proximal sites adjacent to two West Greenland ice streams. Core MSM-520 has a steadily decreasing Os signal over the last 10 kyr (187Os/188Os = 1.35-0.81). In contrast, Os isotopes from core DA00-06 (proximal to the calving front of Jakobshavn Isbr{\ae}) highlight four stages of ice stream retreat and advance over the past 10 kyr (187Os/188Os = 2.31; 1.68; 2.09; 1.47). Our high-resolution chemostratigraphic records provide vital benchmarks for ice-sheet modelers as we attempt to better constrain the future response of major ice sheets to climate change. Variations in Os isotope composition from sediment and macro-algae (seaweed) sourced from regional and global settings serve to emphasize the overwhelming effect weathering sources have on seawater Os isotope composition. Further, these findings demonstrate that the residence time of Os is shorter than previous estimates of ~104 yr.",

keywords = "Greenland ice sheet, Holocene, Ocean-ice interaction, Osmium",

author = "Rooney, {Alan D.} and David Selby and Lloyd, {Jeremy M.} and Roberts, {David H.} and Andreas L{\"u}ckge and Sageman, {Bradley B.} and Prouty, {Nancy G.}",

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T1 - Tracking millennial-scale Holocene glacial advance and retreat using osmium isotopes

T2 - Insights from the Greenland ice sheet

AU - Rooney, Alan D.

AU - Selby, David

AU - Lloyd, Jeremy M.

AU - Roberts, David H.

AU - Lückge, Andreas

AU - Sageman, Bradley B.

AU - Prouty, Nancy G.

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N2 - High-resolution Os isotope stratigraphy can aid in reconstructing Pleistocene ice sheet fluctuation and elucidating the role of local and regional weathering fluxes on the marine Os residence time. This paper presents new Os isotope data from ocean cores adjacent to the West Greenland ice sheet that have excellent chronological controls. Cores MSM-520 and DA00-06 represent distal to proximal sites adjacent to two West Greenland ice streams. Core MSM-520 has a steadily decreasing Os signal over the last 10 kyr (187Os/188Os = 1.35-0.81). In contrast, Os isotopes from core DA00-06 (proximal to the calving front of Jakobshavn Isbræ) highlight four stages of ice stream retreat and advance over the past 10 kyr (187Os/188Os = 2.31; 1.68; 2.09; 1.47). Our high-resolution chemostratigraphic records provide vital benchmarks for ice-sheet modelers as we attempt to better constrain the future response of major ice sheets to climate change. Variations in Os isotope composition from sediment and macro-algae (seaweed) sourced from regional and global settings serve to emphasize the overwhelming effect weathering sources have on seawater Os isotope composition. Further, these findings demonstrate that the residence time of Os is shorter than previous estimates of ~104 yr.

AB - High-resolution Os isotope stratigraphy can aid in reconstructing Pleistocene ice sheet fluctuation and elucidating the role of local and regional weathering fluxes on the marine Os residence time. This paper presents new Os isotope data from ocean cores adjacent to the West Greenland ice sheet that have excellent chronological controls. Cores MSM-520 and DA00-06 represent distal to proximal sites adjacent to two West Greenland ice streams. Core MSM-520 has a steadily decreasing Os signal over the last 10 kyr (187Os/188Os = 1.35-0.81). In contrast, Os isotopes from core DA00-06 (proximal to the calving front of Jakobshavn Isbræ) highlight four stages of ice stream retreat and advance over the past 10 kyr (187Os/188Os = 2.31; 1.68; 2.09; 1.47). Our high-resolution chemostratigraphic records provide vital benchmarks for ice-sheet modelers as we attempt to better constrain the future response of major ice sheets to climate change. Variations in Os isotope composition from sediment and macro-algae (seaweed) sourced from regional and global settings serve to emphasize the overwhelming effect weathering sources have on seawater Os isotope composition. Further, these findings demonstrate that the residence time of Os is shorter than previous estimates of ~104 yr.

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Tracking millennial-scale Holocene glacial advance and retreat using osmium isotopes: Insights from the Greenland ice sheet

Abstract

Funding

Keywords

ASJC Scopus subject areas

UN SDGs

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