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Poster Presentations
Day 2, June 11（Tue.） Room P1 (Multipurpose Hall)・Room P2 (Conference Room 101+102)
- 2P-23（1A-O1-1415）
Spaciotemporal Variability of Local Marine Reservoir Correction In the North Western Pacific
(1Univ. Tokyo, 2AIST)
oYuning Zeng1, Yusuke Yokoyama1, Yosuke Miyairi1, Shoko Hirabayashi1, Atsushi Suzuki2
The surface ocean exchanges with the atmosphere and the 14C-depleted deep ocean, and has a 14C level intermediate between these two reservoirs. This results in an apparent 14C age of surface ocean samples several hundred years older than contemporaneous terrestrial samples. Such an apparent age is defined as the radiocarbon marine reservoir age (R). As the R value of a given location may be different than the model R of the “global” surface ocean (a difference between 14C age of a marine calibration curve (e.g., Marine20) and that of a terrestrial calibration curve (e.g., IntCal20) at a given time), the 14C age offset between these two values is expressed as the regional marine reservoir correction (ΔR). ΔR values are strongly influenced by regional oceanographic conditions, such as ocean currents, deep-water upwelling, and inflow of freshwater, therefore they were used for reconstructing ocean circulation. Here we report 244 ΔR data in Kikai Island during 1580-1950.