Radiocarbon measurements from planktic and benthic foraminifera in the eastern Pacific during the last deglaciation determined from core MAZ-1E-04 collected on cruise MAZ-I aboard the R/V El Puma in April 2015

The structure and drivers of oxygen minimum zone (OMZ) evolution in the Eastern Tropical North Pacific (ETNP) are investigated from ~20.7-10 ka using a multi-proxy from core MAZ-1E-04 (22°54.29’N, 106°54.59’W; 1463 m depth). Understanding how OMZ vertical structure changed during past glacial/interglacial cycles will help elucidate the drivers and patterns of OMZ expansion/contraction on longer timescales.

Here, radiocarbon measurements from planktic and benthic foraminifera from core MAZ-1E-04 collected on cruise MAZ-I aboard the R/V El Puma in April 2015 are used to construct an age model and calculate ventilation ages. Universidad Nacional Autónoma de México financed ship time and M. Alejandro Rodríguez Ramírez directed the oceanographic campaign to retrieve the core.

本研究依托采自MAZ-1E-04岩芯（22°54.29’N，106°54.59’W，水深1463米）的多代用指标数据，对约20.7~10 ka期间东热带北太平洋（Eastern Tropical North Pacific, ETNP）低氧区（oxygen minimum zone, OMZ）的结构及其演化驱动机制展开研究。厘清冰期-间冰期旋回中低氧区垂直结构的演化规律，有助于阐明更长时间尺度下低氧区扩张与收缩的驱动机制与分布模式。

本研究利用2015年4月搭乘“埃尔普马号”（R/V El Puma）科考船MAZ-I航次获取的MAZ-1E-04岩芯中浮游有孔虫与底栖有孔虫的放射性碳测年数据，构建年代模型并计算通风年龄。墨西哥国立自治大学（Universidad Nacional Autónoma de México）资助了本次航次的船时费用，由M. Alejandro Rodríguez Ramírez主持此次海洋科考航次以获取该岩芯。