Research Commons
      • Browse 
        • Communities & Collections
        • Titles
        • Authors
        • By Issue Date
        • Subjects
        • Types
        • Series
      • Help 
        • About
        • Collection Policy
        • OA Mandate Guidelines
        • Guidelines FAQ
        • Contact Us
      • My Account 
        • Sign In
        • Register
      View Item 
      •   Research Commons
      • University of Waikato Research
      • Science and Engineering
      • Science and Engineering Papers
      • View Item
      •   Research Commons
      • University of Waikato Research
      • Science and Engineering
      • Science and Engineering Papers
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Multi-decadal variations in Southern Hemisphere atmospheric ¹⁴C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO₂ anomaly.

      Turney, Chris S.M.; Palmer, Jonathan G.; Hogg, Alan G.; Fogwill, Christopher J.; Jones, Richard; Bronk Ramsey, Christopher; Fenwick, Pavla; Grierson, Pauline; Wilmshurst, Janet; O'Donnell, Alison; Thomas, Zoë; Lipson, Mathew
      Thumbnail
      Files
      Turney_et_al-2016-Global_Biogeochemical_Cycles.pdf
      Accepted version, 775.5Kb
      DOI
       10.1002/2015GB005257
      Link
       onlinelibrary.wiley.com
      Find in your library  
      Citation
      Export citation
      Turney, C. S. M., Palmer, J. G., Hogg, A. G., Fogwill, C. J., Jones, R., Bronk Ramsey, C., … Lipson, M. (2016). Multi-decadal variations in Southern Hemisphere atmospheric ¹⁴C: Evidence against a Southern Ocean sink at the end of the Little Ice Age CO₂ anomaly. Global Biogeochemical Cycles, online. http://doi.org/10.1002/2015GB005257
      Permanent Research Commons link: https://hdl.handle.net/10289/9905
      Abstract
      Northern Hemisphere-wide cooling during the Little Ice Age (LIA; CE 1650-1775) is associated with a ~5 ppmv decrease in atmospheric carbon dioxide. Changes in terrestrial and ocean carbon reservoirs have been postulated as possible drivers of this relatively large shift in atmospheric CO₂, potentially providing insights into the mechanisms and sensitivity of the global carbon cycle. Here we report decadally-resolved radiocarbon (¹⁴C) levels in a network of tree rings series spanning CE 1700-1950 located along the northern boundary of, and within, the Southern Ocean. We observe regional dilutions in atmospheric radiocarbon (relative to the Northern Hemisphere) associated with upwelling of ¹⁴CO₂–depleted abyssal waters. We find the inter-hemispheric ¹⁴C offset approaches zero during increasing global atmospheric CO₂ at the end of the LIA, with reduced ventilation in the Southern Ocean and a Northern Hemisphere source of old carbon (most probably originating from deep Arctic peat layers). The coincidence of the atmospheric CO₂ increase and reduction in the inter-hemispheric ¹⁴C offset imply a common climate control. Possible mechanisms of synchronous change in the high latitudes of both hemispheres are discussed.
      Date
      2016
      Type
      Journal Article
      Publisher
      American Geophysical Union
      Rights
      This is an author’s accepted version of an article published in the journal: Global Biogeochemical Cycles. ©2016 American Geophysical Union.
      Collections
      • Science and Engineering Papers [3122]
      Show full item record  

      Usage

      Downloads, last 12 months
      57
       
       
       

      Usage Statistics

      For this itemFor all of Research Commons

      The University of Waikato - Te Whare Wānanga o WaikatoFeedback and RequestsCopyright and Legal Statement