10Be/9Be Ratios Reflect Antarctic Ice Sheet Freshwater Discharge During Pliocene Warming

Rachel D. Valletta; Jane K. Willenbring; Sandra Passchier; Chiara Elmi

doi:10.1029/2017PA003283

¹⁰Be/⁹Be Ratios Reflect Antarctic Ice Sheet Freshwater Discharge During Pliocene Warming

Rachel D. Valletta, Jane K. Willenbring, Sandra Passchier, Chiara Elmi

Earth and Environmental Studies

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

15 Scopus citations

Abstract

Along glaciated margins, ratios of meteoric cosmogenic beryllium-10, ¹⁰Be, normalized to its stable isotope, ⁹Be, reflect an environmental signal, driven ultimately by climatic change. We explore the application of this isotopic pair as a proxy for East Antarctic Ice Sheet dynamics. We analyze ¹⁰Be/⁹Be in middle Pliocene glaciomarine sediments offshore the Wilkes Land Region (Integrated Ocean Drilling Program (IODP) Site U1361A) and examine our new record alongside existing biochemical/geochemical records (Ba/Al, opal %_wt, εNd, and ⁸⁷Sr/⁸⁶Sr). ¹⁰Be/⁹Be ratios reach local maxima during pulsed, mild warming events and are strongly correlated with existing records that indicate concurrent ice sheet retraction and increased bioproductivity. We suggest climate change as the primary driver of the ¹⁰Be/⁹Be record near glaciated margins, whereby increased warming drives ice sheet retraction, discharging freshwaters and diluting the open ocean ¹⁰Be/⁹Be signal recorded in authigenic minerals.

Original language	English
Pages (from-to)	934-944
Number of pages	11
Journal	Paleoceanography and Paleoclimatology
Volume	33
Issue number	9
DOIs	https://doi.org/10.1029/2017PA003283
State	Published - Sep 2018

Keywords

East Antarctic Ice Sheet
Wilkes Land
beryllium-10
freshwater discharge

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Access to Document

10.1029/2017PA003283

Cite this

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title = "10Be/9Be Ratios Reflect Antarctic Ice Sheet Freshwater Discharge During Pliocene Warming",

abstract = "Along glaciated margins, ratios of meteoric cosmogenic beryllium-10, 10Be, normalized to its stable isotope, 9Be, reflect an environmental signal, driven ultimately by climatic change. We explore the application of this isotopic pair as a proxy for East Antarctic Ice Sheet dynamics. We analyze 10Be/9Be in middle Pliocene glaciomarine sediments offshore the Wilkes Land Region (Integrated Ocean Drilling Program (IODP) Site U1361A) and examine our new record alongside existing biochemical/geochemical records (Ba/Al, opal %wt, εNd, and 87Sr/86Sr). 10Be/9Be ratios reach local maxima during pulsed, mild warming events and are strongly correlated with existing records that indicate concurrent ice sheet retraction and increased bioproductivity. We suggest climate change as the primary driver of the 10Be/9Be record near glaciated margins, whereby increased warming drives ice sheet retraction, discharging freshwaters and diluting the open ocean 10Be/9Be signal recorded in authigenic minerals.",

keywords = "East Antarctic Ice Sheet, Wilkes Land, beryllium-10, freshwater discharge",

author = "Valletta, {Rachel D.} and Willenbring, {Jane K.} and Sandra Passchier and Chiara Elmi",

year = "2018",

month = sep,

doi = "10.1029/2017PA003283",

language = "English",

volume = "33",

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T1 - 10Be/9Be Ratios Reflect Antarctic Ice Sheet Freshwater Discharge During Pliocene Warming

AU - Valletta, Rachel D.

AU - Willenbring, Jane K.

AU - Passchier, Sandra

AU - Elmi, Chiara

PY - 2018/9

Y1 - 2018/9

N2 - Along glaciated margins, ratios of meteoric cosmogenic beryllium-10, 10Be, normalized to its stable isotope, 9Be, reflect an environmental signal, driven ultimately by climatic change. We explore the application of this isotopic pair as a proxy for East Antarctic Ice Sheet dynamics. We analyze 10Be/9Be in middle Pliocene glaciomarine sediments offshore the Wilkes Land Region (Integrated Ocean Drilling Program (IODP) Site U1361A) and examine our new record alongside existing biochemical/geochemical records (Ba/Al, opal %wt, εNd, and 87Sr/86Sr). 10Be/9Be ratios reach local maxima during pulsed, mild warming events and are strongly correlated with existing records that indicate concurrent ice sheet retraction and increased bioproductivity. We suggest climate change as the primary driver of the 10Be/9Be record near glaciated margins, whereby increased warming drives ice sheet retraction, discharging freshwaters and diluting the open ocean 10Be/9Be signal recorded in authigenic minerals.

AB - Along glaciated margins, ratios of meteoric cosmogenic beryllium-10, 10Be, normalized to its stable isotope, 9Be, reflect an environmental signal, driven ultimately by climatic change. We explore the application of this isotopic pair as a proxy for East Antarctic Ice Sheet dynamics. We analyze 10Be/9Be in middle Pliocene glaciomarine sediments offshore the Wilkes Land Region (Integrated Ocean Drilling Program (IODP) Site U1361A) and examine our new record alongside existing biochemical/geochemical records (Ba/Al, opal %wt, εNd, and 87Sr/86Sr). 10Be/9Be ratios reach local maxima during pulsed, mild warming events and are strongly correlated with existing records that indicate concurrent ice sheet retraction and increased bioproductivity. We suggest climate change as the primary driver of the 10Be/9Be record near glaciated margins, whereby increased warming drives ice sheet retraction, discharging freshwaters and diluting the open ocean 10Be/9Be signal recorded in authigenic minerals.

KW - East Antarctic Ice Sheet

KW - Wilkes Land

KW - beryllium-10

KW - freshwater discharge

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