Size-fractionated major, minor, & trace particle composition and concentration from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct to Nov 2018

Size-fractionated particles were collected by in-situ filtration on the U.S. GEOTRACES GP15 Pacific Meridional Transect (PMT), which sampled from Alaska to Tahiti along 152°W Sept-Nov 2018. The PMT expedition was divided into two legs, with cruise IDs RR1814 and RR1815. This dataset results from leg 2, RR1815; data from RR1814 are available in a separate BCO-DMO dataset. This dataset includes a suite of trace elements (e.g. iron, aluminum, zinc, manganese, cadmium, copper, cobalt, titanium, and barium), some of which are required for life, and others that act as tracers of oceanographic processes, and major biologically-produced carrier phases (e.g. particulate organic carbon and the biominerals, calcium carbonate and biogenic silica) in the size-fractionated particles collected from the US PMT section. Along with collaboration with researchers from other institutions, these data are used to assess the relative importance of particle concentration, composition, and size distribution on the cycling and removal of trace elements and their isotopes (TEIs).本数据集的样品采集自美国GEOTRACES计划GP15太平洋经向断面（Pacific Meridional Transect, PMT）航次：该航次于2018年9月至11月沿152°W经线从阿拉斯加延伸至塔希提海域，通过原位过滤（in-situ filtration）收集分粒径颗粒（size-fractionated particles）样品。该PMT航次划分为两个航段，航次编号分别为RR1814与RR1815。本数据集对应第二航段RR1815的观测结果，RR1814航段的相关数据已发布于独立的BCO-DMO数据集。 本数据集包含多类痕量元素（trace elements），包括铁、铝、锌、锰、镉、铜、钴、钛与钡，其中部分为生命活动必需元素，其余可作为海洋学过程示踪剂；同时涵盖本次PMT航次采集的分粒径颗粒中生物成因的主要载体相，即颗粒有机碳、碳酸钙与生物硅等生物矿物。本数据集联合其他科研机构的研究人员开展协同分析，用于评估颗粒浓度、组成与粒径分布在痕量元素及其同位素（trace elements and their isotopes, TEIs）的循环与移除过程中的相对重要性。