Dissolved aluminum and manganese concentrations from samples collected on Northern Gulf of Alaska LTER (NGA LTER) site seasonal cruises in the Gulf of Alaska in 2018-2019

This dataset describes the concentration of dissolved (<0.2 micron) aluminum (dAl) and dissolved manganese (dMn) collected during seasonal cruises in 2018 and 2019 as part of the Northern Gulf of Alaska LTER site (NGA LTER). Surface samples for dAl and dMn were collected on all cruises using a towed system deployed on the side of the ship that served to pump water into a trace metal clean sampling station on the vessel, and samples for depth profiles were collected on the spring 2018 and summer 2019 cruises using a trace metal clean sampling rosette. Concentrations are reported in nanomoles per liter seawater (nM) and the file format is .csv, with one file per cruise. Aluminum and manganese are lithogenic elements that mainly enter NGA waters via freshwater input. Aluminum is not required for biological processes while Mn is a micronutrient, but it is not a limiting nutrient in this area. Together Al and Mn data can contribute to understanding the inputs of iron, whose availability has been shown to influence phytoplankton communities in this region.

本数据集收录了2018至2019年季节性科考航次中采集的溶解态（粒径<0.2微米）铝（dAl, dissolved aluminum）与溶解态锰（dMn, dissolved manganese）浓度数据，相关采样工作隶属于北阿拉斯加湾长期生态研究站点（Northern Gulf of Alaska LTER, NGA LTER）项目。所有航次均通过安装于船舶舷侧的拖曳系统采集表层dAl、dMn样品，该系统将海水泵入船舶上的痕量金属洁净采样站；2018年春季与2019年夏季航次则采用痕量金属洁净多联采水器（sampling rosette）采集深度剖面样品。浓度单位为纳摩尔每升海水（nM），数据文件格式为.csv，每个航次对应一份独立数据文件。铝与锰均为陆源成因元素，主要通过淡水输入进入北阿拉斯加湾海域。铝并非生物过程必需元素，而锰虽为微量营养元素，但在该海域并非限制性营养盐。铝、锰的联合监测数据，可助力理解铁的输入过程——已有研究表明，铁的生物可利用性会影响该区域的浮游植物群落结构。