Year-round discrete underway water column Chlorophyll a concentrations from the central Arctic

Near-daily concentrations of Chlorophyll a and phaeopigments from RV Polarsterns underway water supply system (inlet at 11m water depth) collected during legs 1,3,4, and 5 of the MOSAiC (PS122) drift expedition in the central Arctic Ocean. 2-4L of water were filtered onto pre-combusted GF/F filters (nominal pore size 0.7µm) and frozen at -80°C. Samples were subsequently extracted in 90°C acetone, homogenized using a cell mill, and measured on the following day using a Turner flourometer, followed by an acidification step to determine phaeopigments (see Knap et al. 1996 for details and calculations). Samples were collected from end of October 2019 to beginning of October 2020, with a gap between mid-December and the end of February.

本数据集涵盖北极中央海域MOSAiC（PS122）漂移科考航次第1、3、4、5航段的采样数据，样品由极星号（RV Polarstern）走航供水系统（取水口水深11米）采集，包含近每日的叶绿素a（Chlorophyll a）与脱镁色素（phaeopigments）浓度值。具体实验流程如下：采集2~4升水样，过滤至预灼烧GF/F滤膜（标称孔径0.7μm）后，于-80℃冷冻保存；后续用90℃丙酮萃取样品，经细胞研磨仪均质，次日使用Turner荧光光度计进行测定，再通过酸化步骤计算脱镁色素含量（详细方法与计算公式参见Knap等1996年的研究）。本次采样时段为2019年10月末至2020年10月初，采样间隙为2019年12月中旬至2020年2月末。