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Terrestrial impact of abrupt changes in the North Atlantic thermohaline circulation; early Holocene, UK

Jim D. Marshall, Barbara Lang, Stephen F. Crowley, Graham P. Weedon, Peter van Calsteren, Elizabeth H. Fisher, Richard Holme, Jonathan A. Holmes, Richard T. Jones, Alan Bedford, Steven J. Brooks, Jan Bloemendal, Kostas Kiriakoulakis and James D. Ball
Terrestrial impact of abrupt changes in the North Atlantic thermohaline circulation; early Holocene, UK
Geology (Boulder) (July 2007) 35 (7): 639-642

Abstract

Abrupt cooling events are features of Holocene climate and may recur in the future. We use lake records from Hawes Water, NW England, to quantify the impact of two prominent early Holocene climatic events. Subdecadal oxygen isotope records from sedimentary carbonate ( (super 18) delta O (sub c) ), dated using thermal ionization mass spectrometry (TIMS) U-series analyses, provide evidence for abrupt cold events, lasting approximately 50 and approximately 150 yr at 9350 and 8380 yr ago, which correlate with the 9.3 ka and 8.2 ka events recognized in Greenland ice cores. At Hawes Water, mean July air temperatures, inferred from chironomid assemblages, decreased by approximately 1.6 degrees C during each event. Calculations show that the isotopic excursions were dominantly caused by decreases in the isotopic composition of meteoric precipitation ( (super 18) delta O (sub p) ) by approximately 1.3 per mil; this is interpreted as a direct downstream response to cooling and freshening of northeast Atlantic surface water by melting ice sheets. Intermediate in magnitude between events observed in Greenland and central Europe, the effects are consistent with a partial shutdown of the North Atlantic thermohaline circulation.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 35
Serial Issue: 7
Title: Terrestrial impact of abrupt changes in the North Atlantic thermohaline circulation; early Holocene, UK
Affiliation: University of Liverpool, Department of Earth and Ocean Sciences, Liverpool, United Kingdom
Pages: 639-642
Published: 200707
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 19
Accession Number: 2007-075940
Categories: Quaternary geologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2007158
Illustration Description: illus.
N54°10'58" - N54°10'58", W02°48'10" - W02°48'10"
Secondary Affiliation: University of Wales, GBR, United KingdomOpen University, GBR, United KingdomUniversity College London, GBR, United KingdomUniversity of Exeter, GBR, United KingdomEdge Hill University, GBR, United KingdomNatural History Museum, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200735
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