Mathematics – Logic
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3514707s&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 14, CiteID L14707
Mathematics
Logic
14
Paleoceanography: Cosmogenic Isotopes (1150), Paleoceanography: Abrupt/Rapid Climate Change (1605), Paleoceanography: Thermohaline, Global Change: Earth System Modeling (1225), Geochronology: Quaternary Geochronology
Scientific paper
Variations in carbon-14 to carbon-12 ratio in the atmosphere (Δ14Catm) provide a powerful diagnostic for elucidating the timing and nature of geophysical and anthropological change. The (Atlantic) marine archive suggests a rapid Δ14Catm increase of 50‰ at the onset of the Younger Dryas (YD) cold reversal (12.9-11.7 kyr BP), which has not yet been satisfactorily explained in terms of magnitude or causal mechanism, as either a change in ocean ventilation or production rate. Using Earth-system model simulations and comparison of marine-based radiocarbon records from different ocean basins, we demonstrate that the YD Δ14Catm increase is smaller than suggested by the marine archive. This is due to changes in reservoir age, predominantly caused by reduced ocean ventilation.
Austin William E. N.
Beck Warren J.
Richards David A.
Ridgwell Andy
Singarayer Joy S.
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