A 10Be production‐rate calibration for the Arctic. (10th July 2013)

• Record Type: Journal Article
• Authors: YOUNG, NICOLÁs E.; SCHAEFER, JOERG M.; BRINER, JASON P.; GOEHRING, BRENT M.
• Is Part Of: Journal of quaternary science. Volume 28:Number 5(2013)
• Page Start: 515
• Page End: 526
• Publication Date: 2013-07-10
• Subjects: Geology, Stratigraphic -- Quaternary -- Periodicals; Paleontology -- Quaternary -- Periodicals; 551.79
• DOI: 10.1002/jqs.2642
• Languages: English
• ISSNs: 0267-8179

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>ABSTRACT</title> <sec id="jqs2642-sec-0001" sec-type="section"> <p>We present a Baffin Bay <sup>10</sup>Be production‐rate calibration derived from glacial deposits in western Greenland and Baffin Island, and test our results against published <sup>10</sup>Be calibration datasets to develop an Arctic <sup>10</sup>Be production rate. Our calibration comprises: (i) <sup>10</sup>Be measurements from moraine boulders linked to a <sup>14</sup>C‐dated moraine at Jakobshavn Isfjord in western Greenland, (ii) an independent and previously published <sup>10</sup>Be production rate at Jakobshavn Isfjord and (iii) re‐measured <sup>10</sup>Be concentrations from a Baffin Island calibration site that is included in the north‐eastern North America dataset. Combined, we calculate a sea‐level/high‐latitude <sup>10</sup>Be production rate for the Baffin Bay region of 3.96 ± 0.07 atoms g<sup>−1</sup> a<sup>−1</sup> (Lal/Stone scaling model). After testing the Baffin Bay rate against calibration sites in Norway and north‐eastern North America, we calculate a more conservative Arctic production rate of 3.96 ± 0.15 atoms g<sup>−1</sup> a<sup>−1</sup>. The Baffin Bay and Arctic <sup>10</sup>Be production rates are indistinguishable from the north‐eastern North America <sup>10</sup>Be production rate (3.91 ± 0.19 atoms g<sup>−1</sup> a<sup>−1</sup>) and yield overall uncertainties of <2–3.7% (1σ). These production rates reduce systematic uncertainties in <sup>10</sup>Be‐based chronologies of ice‐margin change and allow <sup>10</sup>Be‐based chronologies to be more confidently compared with high‐resolution climate records, such as those from Greenland ice cores.</p> </sec> </abstract>