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SUMMARY:Simulating radiocarbon in ocean and atmosphere through the deglaci
 ation - Mathis Hain\, University of Southampton
DTSTART:20141111T160000Z
DTEND:20141111T170000Z
UID:TALK53932@talks.cam.ac.uk
CONTACT:Natalie Roberts
DESCRIPTION:Radiocarbon (14C) is produced by spallation reactions in the a
 tmosphere\, mixes with the stable carbon isotopes and becomes part of the 
 global carbon cycle.\nThe large oceanic carbon reservoir hosts the majorit
 y of 14C decay\, and thus the partitioning of radiocarbon between atmosphe
 re and ocean holds key information on the exchange of carbon between ocean
  and atmosphere as well as the rate of ocean overturning and the ventilati
 on of deep waters. During the Last Glacial Maximum (LGM) atmospheric 14C/C
  was ~40% greater than in the pre-nuclear modern\, and 14C/C declined over
  the course of the deglacial in a manner that very much mirrors the rise o
 f atmospheric CO2. Furthermore\, anomalously low 14C/C reconstructions cor
 related to deglacial climate swings and CO2 rise have been interpreted as 
 the release of a hypothesised\, previously stagnated deep ocean reservoir 
 of sequestered CO2. This talk describes numerical model results that speak
  to the occurrence (or not) of deep ocean stagnation during the LGM and me
 chanisms that explain (or not) the deglacial decline of atmospheric 14C/C.
 \n\nReferences: \n\nHain et al (2014) Distinct roles of the Southern Ocean
  and North Atlantic in the deglacial atmospheric radiocarbon decline. EPSL
  394\, 198-208\n\nHain et al (2014) The biological pump in the past. Treat
 ise on geochemistry\, vol 8 pp 485 - 517 (email nr297@cam.ac.uk if you wou
 ld like a copy)
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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