ORCID

Abstract

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.

DOI

10.1016/j.quascirev.2015.06.027

Publication Date

2015-12-31

Publication Title

Quaternary Science Reviews

Volume

131

First Page

341

Last Page

349

ISSN

0277-3791

Embargo Period

2017-01-01

Organisational Unit

Faculty of Science and Engineering

Keywords

8200-year event, Early Holocene, Ireland, Isotope-enabled GCM, Oxygen-isotopes

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