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Persistent millennial-scale glacier fluctuations in Ireland between 24 ka and 10 ka

Barth, Aaron M, Clark, Peter U, Clark, Jorie, Roe, Gerard H, Marcott, Shaun A, McCabe, AM, Caffee, Marc W, Cuzzone, Joshua K and Dunlop, P. (2017) Persistent millennial-scale glacier fluctuations in Ireland between 24 ka and 10 ka. Geology, 46 (2). pp. 151-154. [Journal article]

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URL: https://doi.org/10.1130/G39796.1

DOI: 10.1130/G39796.1

Abstract

We report 80 10Be ages on 14 moraines from Irish cirques that show a previously unrecognized signal of at least eight millennial-scale fluctuations between 24.5±0.7 ka and 11.0±0.3 ka. Several moraine ages may be correlative with abrupt warming at the onset of the Bølling (14.7 ka) and the end of the Younger Dryas (11.7 ka), suggesting a forced response. Our ages also identify glacier fluctuations that occurred when regional temperatures were relatively stable. This finding is consistent with modeling results showing several hundred-meter-scale glacier fluctuations in response to interannual variability. At the same time, our composite record of cirque-glacier average equilibrium line altitudes (ELAs) shows a response to warming due to increasing greenhouse gases and summer insolation modulated by abrupt climate changes. Our new 10Be chronology thus records both forced and unforced millennial-scale glacier fluctuations superimposed on a lower frequency ELA signal of forced response to climate change.

Item Type:Journal article
Keywords:Glacier, Cirque, Glaciation, Ice Sheet
Faculties and Schools:Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Environmental Sciences Research Institute > Quaternary Environmental Change
Environmental Sciences Research Institute
ID Code:39058
Deposited By: Dr Paul Dunlop
Deposited On:28 Nov 2017 16:52
Last Modified:12 Dec 2018 23:23

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