Premium
An oceanic origin for the increase of atmospheric radiocarbon during the Younger Dryas
Author(s) -
Singarayer Joy S.,
Richards David A.,
Ridgwell Andy,
Valdes Paul J.,
Austin William E. N.,
Beck J. Warren
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl034074
Subject(s) - younger dryas , radiocarbon dating , geology , atmosphere (unit) , oceanography , carbon cycle , quaternary , climatology , climate change , environmental science , paleontology , meteorology , geography , ecology , ecosystem , biology
Variations in carbon‐14 to carbon‐12 ratio in the atmosphere (Δ 14 C atm ) provide a powerful diagnostic for elucidating the timing and nature of geophysical and anthropological change. The (Atlantic) marine archive suggests a rapid Δ 14 C atm 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 Δ 14 C atm increase is smaller than suggested by the marine archive. This is due to changes in reservoir age, predominantly caused by reduced ocean ventilation.