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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 |
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| Authors: | Aaron F Diefendorf William P Patterson |
| Institution: | a Department of Geological Sciences, 114 Science Place Drive, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2 b Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, NY 13244, USA c Department of Environmental Science and Geology, University of Mary Washington, Jepson Science Center, 1301 College Ave, Fredericksburg, VA 22401, USA d Department of Geology, Amherst College, Amherst, MA 01002, USA |
| Abstract: | 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. |
| Keywords: | Oxygen isotopes Lake sediment Ireland Late Glacial Holocene Atmospheric circulation Climate change |
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