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Radiocarbon variability recorded in coral skeletons from the northwest of Luzon Island, Philippines

机译:菲律宾吕宋岛西北部珊瑚骨骼中记录的放射性碳变异性

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Abstract The North Equatorial Current (NEC) bifurcates at the eastern coast of the Philippines and moves northward as the Kuroshio, a North Pacific western boundary current. The NEC bifurcation point and Kuroshio variability are known to be affected by changes in climate such as the El Ni?o–Southern Oscillation and the pacific decadal oscillation. However, observational data are not sufficient to examine the mechanisms of decadal fluctuation. Here, we report seasonal radiocarbon data recorded from 1968 to 1995 in coral skeletons northwest of Luzon Island. The data suggest that the East Asian winter monsoon is a dominant factor in the seasonal fluctuations in water mass northwest of Luzon Island. Compared with other coral records reported for Guam, Ishigaki, Con Dao, and Hon Tre Island, the data suggest that the area of the Kuroshio loop current through the Luzon Strait decreased from the 1970s to 1980s as a result of the change in Kuroshio transport and the migration of the NEC bifurcation latitude after a regime shift in 1976.
机译:摘要北赤道洋流(NEC)在菲律宾东部海岸分叉,向北移动,成为北太平洋西边界流黑潮。众所周知,NEC的分叉点和黑潮的变率受气候变化的影响,例如厄尔尼诺现象-南方涛动和太平洋年代际振荡。但是,观测数据不足以检查年代际波动的机制。在这里,我们报告了1968年至1995年在吕宋岛西北部珊瑚骨架中记录的季节性放射性碳数据。数据表明,东亚冬季风是吕宋岛西北部水量季节性波动的主要因素。与关岛,石垣,昆岛和本岛的其他珊瑚记录相比,该数据表明,由于黑潮的运输和气候变化,流经吕宋海峡的黑潮环流面积从1970年代到1980年代有所减少。 1976年政权转移后NEC分叉纬度的迁移。

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