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North Atlantic climate and deep-ocean flow speed changes during the last 230 years

Boessenkool, Karin Petra, Hall, Ian Robert, Elderfield, H. and Yashayaev, I. 2007. North Atlantic climate and deep-ocean flow speed changes during the last 230 years. Geophysical Research Letters 34 (13) , L13614. 10.1029/2007GL030285

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Abstract

Variations in the near-bottom flow speed of Iceland-Scotland Overflow Water (ISOW) are documented in a 230-year-long deep-sea sediment record from the eastern flank of Reykjanes Ridge in the subpolar North Atlantic at (sub)decadal time scales. For recent decades, the ISOW palaeocurrent reconstructions show similarities with observational hydrographic data. Furthermore, recent ISOW flow changes fall mostly within the range of its variability of the past 230 years. The record also reveals a hitherto unrecognized coupling of deep flow speeds in the subpolar North Atlantic with the North Atlantic Oscillation (NAO) index, with more (less) vigorous ISOW flow during negative (positive) phases of the NAO. Our results suggest that the changes in ISOW vigor are largely controlled by the transport and characteristics of Labrador Sea Water rather than variations in the overflow itself, with implications for the meridional overturning of the Atlantic Ocean and climate.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GC Oceanography
Uncontrolled Keywords: deep ocean circulation; North Atlantic Oscillation; drift sediments
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0094-8276/ (accessed 20/02/2014).
Publisher: American Geophysical Union
ISSN: 0094-8276
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 04:00
URI: http://orca.cf.ac.uk/id/eprint/30498

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