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      Coccolithophore paleoproductivity and ecology response to deglacial and Holocene changes in the Azores Current System : AZF AND PP DYNAMICS DURING LAST 16 KYR

      , , ,
      Paleoceanography
      American Geophysical Union (AGU)

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          IntCal09 and Marine09 Radiocarbon Age Calibration Curves, 0–50,000 Years cal BP

          The IntCal04 and Marine04 radiocarbon calibration curves have been updated from 12 cal kBP (cal kBP is here defined as thousands of calibrated years before AD 1950), and extended to 50 cal kBP, utilizing newly available data sets that meet the IntCal Working Group criteria for pristine corals and other carbonates and for quantification of uncertainty in both the14C and calendar timescales as established in 2002. No change was made to the curves from 0–12 cal kBP. The curves were constructed using a Markov chain Monte Carlo (MCMC) implementation of the random walk model used for IntCal04 and Marine04. The new curves were ratified at the 20th International Radiocarbon Conference in June 2009 and are available in the Supplemental Material atwww.radiocarbon.org.
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            A Pervasive Millennial-Scale Cycle in North Atlantic Holocene and Glacial Climates

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              Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes.

              The Atlantic meridional overturning circulation is widely believed to affect climate. Changes in ocean circulation have been inferred from records of the deep water chemical composition derived from sedimentary nutrient proxies, but their impact on climate is difficult to assess because such reconstructions provide insufficient constraints on the rate of overturning. Here we report measurements of 231Pa/230Th, a kinematic proxy for the meridional overturning circulation, in a sediment core from the subtropical North Atlantic Ocean. We find that the meridional overturning was nearly, or completely, eliminated during the coldest deglacial interval in the North Atlantic region, beginning with the catastrophic iceberg discharge Heinrich event H1, 17,500 yr ago, and declined sharply but briefly into the Younger Dryas cold event, about 12,700 yr ago. Following these cold events, the 231Pa/230Th record indicates that rapid accelerations of the meridional overturning circulation were concurrent with the two strongest regional warming events during deglaciation. These results confirm the significance of variations in the rate of the Atlantic meridional overturning circulation for abrupt climate changes.
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                Author and article information

                Journal
                Paleoceanography
                Paleoceanography
                American Geophysical Union (AGU)
                08838305
                September 2012
                September 2012
                August 08 2012
                : 27
                : 3
                : n/a
                Article
                10.1029/2012PA002281
                5bae4efc-26d8-4b0f-985a-742aff1348e6
                © 2012

                http://doi.wiley.com/10.1002/tdm_license_1.1

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