López-Martinez, C. and Grimalt, J. O. and Hoogakker, B. A. A. and Gruetzner, J. and Vautravers, M. J. and McCave, I. N. (2006) Abrupt wind regime changes in the North Atlantic Ocean during the past 30,000-60,000 years. Paleoceanography, 21 (4). PA4215; http://dx.doi.org/10.1029/2006PA001275. DOI https://doi.org/10.1029/2006PA001275
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Abstract
The inputs of higher plants in Blake Outer Ridge (subtropical western North Atlantic) during marine isotope stage 3 (MIS3) have been recorded at high resolution by quantification of C23–C33 odd carbon numbered n-alkanes and C20–C30 even carbon numbered n-alkan-1-ols in sediment sections of Ocean Drilling Program Site 1060. The changes of these proxies at this open marine site are mainly related to eolian inputs. Their concentrations and fluxes exhibit major abrupt variations that are correlated with Dansgaard/Oeschger (D/O) patterns in Greenland ice cores. The ratios between interstadials and stadials range between 2 and 9 times. The intense flux increases in the D/O stadials are linked to strong enhancements of the westerly wind regime at these subtropical latitudes during stadials. The observed variation was paralleled by changes in wind-blown dust and the polar circulation index in Greenland ice, which is in agreement with previously hypothesized atmospheric teleconnections between northern and middle-low latitudes of the Northern Hemisphere. The close correspondence between sedimentary and ice core proxies is evidence that crossings of the glacial climate thresholds involved major reorganizations of the troposphere. The observed large rise in higher plant biomarkers indicates that climate stabilization in the D/O stadial conditions led to main increases in wind intensity.
Item Type: | Article |
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Uncontrolled Keywords: | 2006 AREP IA52 2006 P |
Subjects: | 01 - Climate Change and Earth-Ocean Atmosphere Systems |
Divisions: | 01 - Climate Change and Earth-Ocean Atmosphere Systems |
Journal or Publication Title: | Paleoceanography |
Volume: | 21 |
Page Range: | PA4215; http://dx.doi.org/10.1029/2006PA001275 |
Identification Number: | https://doi.org/10.1029/2006PA001275 |
Depositing User: | Sarah Humbert |
Date Deposited: | 16 Feb 2009 13:03 |
Last Modified: | 23 Jul 2013 10:07 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/485 |
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