5
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

      The timing of the last deglaciation in North Atlantic climate records.

      1 , , , , ,
      Nature

      Read this article at

      ScienceOpenPublisherPubMed
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          To determine the mechanisms governing the last deglaciation and the sequence of events that lead to deglaciation, it is important to obtain a temporal framework that applies to both continental and marine climate records. Radiocarbon dating has been widely used to derive calendar dates for marine sediments, but it rests on the assumption that the 'apparent age' of surface water (the age of surface water relative to the atmosphere) has remained constant over time. Here we present new evidence for variation in the apparent age of surface water (or reservoir age) in the North Atlantic ocean north of 40 degrees N over the past 20,000 years. In two cores we found apparent surface-water ages to be larger than those of today by 1,230 +/- 600 and 1,940 +/- 750 years at the end of the Heinrich 1 surge event (15,000 years BP) and by 820 +/- 430 to 1,010 +/- 340 years at the end of the Younger Dryas cold episode. During the warm Bølling-Allerød period, between these two periods of large reservoir ages, apparent surface-water ages were comparable to present values. Our results allow us to reconcile the chronologies from ice cores and the North Atlantic marine records over the entire deglaciation period. Moreover, the data imply that marine carbon dates from the North Atlantic north of 40 degrees N will need to be corrected for these highly variable effects.

          Related collections

          Author and article information

          Journal
          Nature
          Nature
          0028-0836
          0028-0836
          Aug 16 2001
          : 412
          : 6848
          Affiliations
          [1 ] Laboratoire des Sciences du Climat et de l'Environnement, Domaine du CNRS, bât. 12, 91198 Gif-sur-Yvette, France. Claire.Waelbroeck@lsce.cnrs-gif.fr
          Article
          35089060
          10.1038/35089060
          11507637
          6473c2e5-906d-4d3d-9c8d-d6e90b432bd2
          History

          Comments

          Comment on this article