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

Boessenkool, K. P. and Hall, I. R. and 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. ISSN 0094-8276 DOI 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
Uncontrolled Keywords: 2007 AREP IA55 2007 P
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Geophysical Research Letters
Volume: 34
Page Range: L13614
Identification Number: 10.1029/2007GL030285
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:01
Last Modified: 23 Jul 2013 10:01
URI: http://eprints.esc.cam.ac.uk/id/eprint/152

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