Atlantic Meridional Transect cruise AMT26 (JR16001) micro-molar nutrient measurements from CTD bottle samples collected in 2016.

This dataset consists of measurements of micromolar nutrient concentrations made on samples collected during the Atlantic Meridional Transect programme cruise 26 (AMT26 JR16001) on the RRS James Clark Ross, between 24th September and 1st November 2016. The cruise track between UK and Port Stanley, Falkland Islands, passed through both north and south Atlantic gyres. This dataset contributes to the AMT time-series of core oceanographic measurements along a north-south transect of the Atlantic Ocean. Samples were collected on a daily basis at all sampled CTD depths (according to GO-SHIP protocols), usually from samples in the upper 500m, using a CTD rosette with 24 x 20L OTE (Ocean Test Equipment) bottles. Samples were analysed within 2-3 hours of collection for nitrate+nitrite, nitrite, phosphate and silicate using a 5-channel Bran and Luebbe AAIII segmented flow, colorimetric, auto-analyser (Brewer and Riley (1965) for nitrate, Grasshoff (1976) for nitrite, and Kirkwood (1989) for phosphate and silicate). Established, proven analytical protocols were used and clean sampling and handling techniques were employed. Certified Nutrient reference materials from KANSO Ltd, Japan (Batch BU), were used during the cruise to ensure good quality control and reliable analytical results.

本数据集包含2016年9月24日至11月1日期间，搭载RRS詹姆斯·克拉克·罗斯号（RRS James Clark Ross）执行大西洋经向断面计划（Atlantic Meridional Transect, AMT）第26航次（AMT26 JR16001）所采集样品的微摩尔级营养盐浓度测量数据。本次航次航线从英国出发，途经福克兰群岛的斯坦利港，横跨北大西洋与南大西洋两大环流区。本数据集为大西洋南北向经向断面的核心海洋观测AMT时间序列提供数据支撑。本次采样按照全球标准船测计划（GO-SHIP）规程进行，使用搭载24个20升OTE（Ocean Test Equipment，海洋测试设备）采水瓶的温盐深（CTD）采水架，每日在所有预设CTD采样深度采集海水样品，采样深度通常覆盖上层500米海域。样品采集后2-3小时内，使用5通道Bran+Luebbe AAIII分段流动比色自动分析仪，对硝酸盐+亚硝酸盐、亚硝酸盐、磷酸盐和硅酸盐进行检测；其中硝酸盐检测方法参考Brewer与Riley（1965）的研究，亚硝酸盐检测参考Grasshoff（1976）的方法，磷酸盐与硅酸盐检测参考Kirkwood（1989）的方法。本次检测采用经过验证的标准分析规程，并严格执行洁净采样与样品处理操作规范。航次期间使用日本KANSO有限公司认证的营养盐标准参考物质（批次BU），以保障分析过程的质量控制与检测结果的可靠性。