![](https://d3ilqtpdwi981i.cloudfront.net/5W7dD9dlAoC-vOUOCzurM_1Lf4U=/425x550/smart/https://bepress-attached-resources.s3.amazonaws.com/uploads/e5/0d/61/e50d6199-3003-469a-bcdd-9898856a0e5d/file.png)
Article
Persistent millennial-scale glacier fluctuations in Ireland between 24 ka and 10 ka.
Geology
(2017)
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-Allerød interval (14.7 ka) and the end of the Younger Dryas interval (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.
Disciplines
- Geology and
- Glaciology
Publication Date
December 12, 2017
DOI
10.1130/G39796.1
Citation Information
Aaron M. Barth, Peter U. Clark, Jorie Clark, Gerald H. Roe, et al.. "Persistent millennial-scale glacier fluctuations in Ireland between 24 ka and 10 ka." Geology Vol. 46 Iss. 2 (2017) p. 151 - 154 Available at: http://works.bepress.com/aaron-barth/26/