North Atlantic ecosystem sensitivity to Holocene shifts in Meridional overturning circulation

Douarin, M., Elliot, M., Noble, S. R., Moreton, S. G. , Long, D., Sinclair, D., Henry, L.-A. and Roberts, J. M. (2016) North Atlantic ecosystem sensitivity to Holocene shifts in Meridional overturning circulation. Geophysical Research Letters, 43(1), pp. 291-298. (doi: 10.1002/2015GL065999)

Abstract

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 4500 year 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 1.2 kyr B.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 ~ 0.1 kyr B.P.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Moreton, Dr Steven
• Authors: Douarin, M., Elliot, M., Noble, S. R., Moreton, S. G., Long, D., Sinclair, D., Henry, L.-A., and Roberts, J. M.
• College/School: College of Science and Engineering > Scottish Universities Environmental Research Centre
• Journal Name: Geophysical Research Letters
• Publisher: Wiley
• ISSN: 0094-8276
• ISSN (Online): Geophysical Research Letters
• Published Online: 08 January 2016
• Copyright Holders: Copyright © 2015 American Geophysical Union
• First Published: First published in Geophysical Research Letters 43(1):291-298
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher