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Evidence for high-frequency late Glacial to mid-Holocene (16,800 to 5500 cal yr B.P.) climate variability from oxygen isotope values of Lough Inchiquin, Ireland

Published online by Cambridge University Press:  20 January 2017

Aaron F. Diefendorf*
Department of Geological Sciences, 114 Science Place Drive, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2
William P. Patterson
Department of Geological Sciences, 114 Science Place Drive, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2
Henry T. Mullins
Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, NY 13244, USA
Neil Tibert
Department of Environmental Science and Geology, University of Mary Washington, Jepson Science Center, 1301 College Ave, Fredericksburg, VA 22401, USA
Anna Martini
Department of Geology, Amherst College, Amherst, MA 01002, USA
*Corresponding author. Fax: +1 306 966 8593.Email Diefendorf), Patterson), Mullins),, Tibert),, Martini).


A 7.6-m core recovered from Lough Inchiquin, western Ireland provides evidence for rapid and long-term climate change from the Late Glacial period to the Mid-Holocene. We determined percentage of carbonate, total organic matter, mineralogy, and δ18Ocalcite values to provide the first high-resolution record of climate variability for this period in Ireland. Following deglaciation, rapid climate amelioration preceded large increases in GISP2 δ18Oice values by ∼2300 yr. The Oldest Dryas (15,100 to 14,500 cal yr B.P.) Late Glacial event is documented in this record as a decrease in δ18Ocalcite values. Brief warming at ∼12,700 cal yr B.P. was followed by characteristic Younger Dryas cold and dry climate conditions. A rapid increase in δ18Ocalcite values at ∼10,500 cal yr B.P. marked the onset of Boreal warming in western Ireland. The 8200 cal yr B.P. event is represented by a brief cooling in our record. Prior to general warming, a larger and previously undescribed climate anomaly between 7300 and 6700 cal yr B.P. is characterized by low δ18Ocalcite values with high-frequency variability.

Original Articles
University of Washington

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