Subsurface water mass variations in the Kuroshio region inferred from 14C age difference of planktic foraminifers with different depth habitat

在黑潮区和西北太平洋副热带涡旋的活塞芯重建了浮游有孔虫与表层浮游有孔虫的年龄和δ^&lt；18&gt；O的差异。虽然全新世的14&C年龄不存在系统差异，但在末次冰川消融和末次冰盛期(LGM)，沉积岩芯中明显存在着超过1000年的年龄差异。为了建立西北太平洋海芯的年龄模型，只需用一种表层水物种进行14&C年龄的测定。

The differences in^<14> C age andδ^<18> O between surface and subsurface planktic foraminifers are reconstructed at the piston cores from the Kuroshio region and the subtropical gyre in the Northwest Pacific. Although there is no systematic difference of^<14> C ages during the Holocene,^<14> C age differences exceeding 1000 years are clearly observed in the sediment cores during the last deglaciation and the last glacial maximum(LGM). To establish an age model of marine core in the Northwest Pacific, it necessary to measure^<14> C age only using a surface water species.