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Mandatory Fields
Holmes, JA; Tindall, J; Roberts, N; Marshall, W; Marshall, JD; Bingham, A; Feeser, I; O’Connell, M; Atkinson, T; Jourdan, A-L; March, A; Fisher, EH
Quaternary Science Reviews
Lake isotope records of the 8200-year cooling event in western Ireland: comparison with model simulations
Optional Fields
8200-year event; Oxygen-isotopes; Isotope-enabled GCM; Early Holocene; Ireland
NOTE: this paper is open access 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.
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