Lake isotope records of the 8200-year cooling event in western Ireland: Comparison with model simulations

Holmes, Jonathan A, Tindall, Julia, Roberts, Neil, Marshall, William, Marshall, Jim D, Bingham, Ann, Feeser, Ingo, O'Connell, Michael, Atkinson, Tim, Jourdan, Anne-Lise
et al (show 2 more authors) (2016) Lake isotope records of the 8200-year cooling event in western Ireland: Comparison with model simulations. Quaternary Science Reviews: the international multidisciplinary research and review journal, 131 (Part B). 341 - 349.

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The early Holocene cooling, which occurred around 8200 calendar years before present, was a prominent abrupt event around the north Atlantic region. Here, we investigate the timing, duration, magnitude and regional coherence of the event as expressed in carbonate oxygen-isotope records from three lakes on northwest Europe's Atlantic margin in western Ireland, namely Loch Avolla, Loch Gealáin and Lough Corrib. An abrupt negative oxygen-isotope excursion lasted about 200 years. Comparison of records from three sites suggests that the excursion was primarily the result of a reduction of the oxygen-isotope values of precipitation, which was likely caused by lowered air temperatures, possibly coupled with a change in atmospheric circulation. Comparison of records from two of the lakes (Loch Avolla and Loch Gealáin), which have differing bathymetries, further suggests a reduction in evaporative loss of lake water during the cooling episode. Comparison of climate model experiments with lake-sediment isotope data indicates that effective moisture may have increased along this part of the northeast Atlantic seaboard during the 8200-year climatic event, as lower evaporation compensated for reduced precipitation.

Item Type: Article
Uncontrolled Keywords: 8200-year event, Oxygen-isotopes, Isotope-enabled GCM, Early Holocene, Ireland
Depositing User: Symplectic Admin
Date Deposited: 28 Jun 2018 15:22
Last Modified: 06 Sep 2022 11:55
DOI: 10.1016/j.quascirev.2015.06.027
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