Dissolved Th/Pa measurements from CTD Niskin collected depth profiles from a GEOTRACES transect cruise along the Mid-Atlantic Ridge in the North Atlantic (GA13/JC156) during December 2017 to January 2018

This dataset contains concentrations of dissolved thorium and protactinium isotopes (Th-232, Th-230, Pa-231) in seawater collected during the GEOTRACES transect cruise GA13 (JC156) in winter 2017-2018. Dissolved thorium and protactinium isotopes (Th-232, Th-230, and Pa-231) were analyzed as core parameters on GEOTRACES cruise transect GA13. This cruise transect focused on known hydrothermal venting sites along the mid-Atlantic ridge of the North Atlantic. The Th/Pa isotopes are excellent tracers of inorganic scavenging (chemical adsorption) onto hydrothermal particulate material and help demonstrate the impact particles can have on scavenging other trace metals of biogeochemical interest. A start-up grant from the University of Southern Mississippi funded the analysis at USM. The cruise was funded by the UK NERC.本数据集收录了2017-2018年冬季全球海洋示踪计划（GEOTRACES）GA13断面科考巡航（JC156）期间采集的海水样品中溶解态钍（dissolved thorium）与镤（protactinium）同位素（Th-232、Th-230、Pa-231）的浓度数据。上述溶解态钍与镤同位素（Th-232、Th-230、Pa-231）被列为核心分析参数，在GEOTRACES计划的GA13断面科考巡航中完成检测分析。本次断面科考巡航聚焦于北大西洋中大西洋洋脊（mid-Atlantic ridge）沿线已知的热液喷口（hydrothermal venting sites）区域。钍/镤同位素是热液颗粒物（hydrothermal particulate material）表面无机清除（inorganic scavenging，化学吸附）过程的优良示踪剂，可用于阐明颗粒物对其他具有生物地球化学（biogeochemical）研究价值的痕量金属（trace metals）的清除作用机制。南密西西比大学（University of Southern Mississippi，简称USM）的启动基金为该分析工作提供了资助。本次科考巡航由英国自然环境研究委员会（UK NERC）资助。