Hydroclimatic changes during the 8.2 ka event inferred from Irish subfossil pines

Max C.A. Torbenson, Gill Plunkett, David Brown

Research output: Contribution to conferencePoster

Abstract

A significant cold event, derived from the Greenland ice cores, took place between 8200 and 8000 cal. BP. Modeling of the event suggests that higher northern latitudes would have experienced considerable decreases in precipitation and that Ireland would have witnessed one of the greatest depressions. However, no well-dated proxy record exists from the British Isles to test the model results. Here we present independent evidence for a phase of major pine recruitment on Irish bogs at around 8150 cal. BP. Dendrochronological dating of subfossil trees from three sites reveal synchronicity in germination across the region, indicative of a regional forcing, and allows for high-precision radiocarbon based dates. The inner-rings of 40% of all samples from the north of Ireland dating to the period 8,500-7,500 cal. BP fall within a 25-year window. The concurrent colonization of pine on peatland is interpreted as drier conditions in the region and provide the first substantive proxy data in support of a significant hydrological change in the north of Ireland accompanying the 8.2 ka event. Our results also indicate that the apparent temporal asynchrony between anomalies in proxy records at the time could be a result of differences in dating methods.
Original languageEnglish
PagesPP11A-1797
Publication statusPublished - Dec 2013
EventAmerican Geophysical Union Fall Meeting - San Francisco, United States
Duration: 09 Dec 201313 Dec 2013

Conference

ConferenceAmerican Geophysical Union Fall Meeting
CountryUnited States
CitySan Francisco
Period09/12/201313/12/2013

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