North Atlantic surface ocean 14C variability between 30 – 40 kyr. BP

Jesper Olsen, Fadil Inceoglu, Joy Singarayer, Tine Rasmussen, Paula Reimer

Research output: Contribution to conferencePaper

Abstract

The Faroe-Shetland channel is situated in the main path of the inflow of warm North Atlantic surface water to the Nordic seas and further provides an escape route for the cold Norwegian Sea Deep Water. AMS 14C dates of planktonic foraminifera covering Marine Isotope Stage 3 from two cores in the Faroe-Shetland channel will be used to trace past variability of the Atlantic Meridional Overturning Circulation (AMOC). The reservoir age R shows considerable variability ranging between 50 to 2750 14C years. In particular high R values are observed during Heinrich event 4 (H4) with values around 1550 14C years and during the Laschamp magnetic excursion with R values as high as 2700 14C years. The period between Greenland interstadial 8 (GI8) and GI5 show highly variable R values with interstadial R values around 500 – 650 14C years, i.e. slightly higher than ‘normal’, whereas stadials show either significantly higher or lower R values. From GI5 towards the Last Glacial Maximum R values are generally around 1000 14C years or higher. Using magnetic susceptibility, IRD and δ13C and δ18O values measured on the planktic foraminifera species Neogloboquadrina pachyderma, we compare the observed R variability with reconstructed changes in the Atlantic Meridional Overturning Circulation (AMOC). Furthermore a climate model of intermediate complexity (GENIE) including 14C is used as conceptual tool for identifying oceanographic configuration explaining the observed R variability.
Original languageEnglish
Publication statusPublished - 21 Aug 2014
EventRadiocarbon in the Environment 2014 - Northern Ireland, Belfast, United Kingdom
Duration: 18 Aug 201422 Aug 2014

Conference

ConferenceRadiocarbon in the Environment 2014
CountryUnited Kingdom
CityBelfast
Period18/08/201422/08/2014

Keywords

  • radiocarbon
  • Ocean dynamics

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    Olsen, J., Inceoglu, F., Singarayer, J., Rasmussen, T., & Reimer, P. (2014). North Atlantic surface ocean 14C variability between 30 – 40 kyr. BP. Paper presented at Radiocarbon in the Environment 2014, Belfast, United Kingdom. http://www.qub.ac.uk/sites/14C/ConferenceProgramme/