Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 1, Pages 291-298Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL065999
Keywords
marine radiocarbon; cold-water coral reef growth rate; Holocene; Atlantic Meridional Overturning Circulation
Categories
Funding
- British Geological Survey (BGS)
- Scottish Alliance for Geoscience, Environment and Society (SAGES)
- NERC through the UK Ocean Acidification programme and subsequent awards [NE/H017305/1, NE/J021121/1]
- NERC [nigl010001, NRCF010001, NE/H017305/1, NE/J021121/1] Funding Source: UKRI
- Natural Environment Research Council [nigl010001, NRCF010001, NE/J021121/1, NE/H017305/1] Funding Source: researchfish
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Rapid changes in North Atlantic climate over the last millennia were driven by coupled sea surface/atmospheric processes and rates of deep water formation. Holocene climate changes, however, remain poorly documented due to a lack of high-resolution paleoclimate records, and their impacts on marine ecosystems remain unknown. We present a 4500year absolute-dated sea surface radiocarbon record from northeast Atlantic cold-water corals. In contrast to the current view that surface ocean changes occurred on millennial-scale cycles, our record shows more abrupt changes in surface circulation. Changes were centered at 3.4, 2.7, 1.7, and 1.2kyrB.P. and associated with atmospheric reorganization. Solar irradiance may have influenced these anomalies but changes in North Atlantic deep water convection are likely to have amplified these signals. Critically, we provide the first evidence that these perturbations in Atlantic Meridional Overturning Circulation led to the decline of cold-water coral ecosystems from 1.2 to similar to 0.1 kyr B.P.
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