A global compolation of late Holocene planktonic foraminiferal δ¹⁸O

We review the different sources of uncertainty affecting the oxygen isotopic composition of planktonic foraminifera and present a global planktonic foraminifera oxygen isotope data set that has been assembled within the MARGO project for the Late Holocene time slice. The data set consists of over 2100 data from recent sediment with thorough age control, that have been checked for internal consistency. We further examine how the oxygen isotopic composition of fossil foraminifera is related to hydrological conditions, based on published results on living foraminifera from plankton tows and cultures. Oxygen isotopic values (delta18O) of MARGO recent fossil foraminifera are 0.2-0.8 per mil higher than those of living foraminifera. Our results show that this discrepancy is related to the stratification of the upper water mass and generally increases at low latitudes. […]

本文综述了影响浮游有孔虫氧同位素组成的各种不确定性来源，并呈现了MARGO项目在晚全新世时段构建的全球浮游有孔虫氧同位素数据集。该数据集由超过2100个近期沉积物数据组成，这些数据经过严格的年代控制，并经过内部一致性检验。我们进一步探讨了化石有孔虫的氧同位素组成与水文条件之间的关系，基于对浮游有孔虫拖网和文化中活有孔虫的已发表研究结果。MARGO近期化石有孔虫的氧同位素值（δ18O）比活有孔虫高0.2-0.8‰。我们的结果表明，这种差异与上层水体的层结有关，并且在低纬度地区通常会增加。