Stainless steel CTD water column profiles (temperature, salinity, dissolved oxygen, optical backscatter, beam transmittance and attenuation, PAR, chlorophyll-a fluorescence ) collected in the Norwegian and Barents Sea in July-August 2023 on cruise DY167 (GEOTRACES GApr19).

This dataset contains in-situ temperature, salinity, dissolved oxygen, optical backscatter, beam transmittance and attenuation, PAR, chlorophyll-a fluorescence data from 186 downcast stainless steel CTD profiles. The measurements were collected during cruise DY167 (GEOTRACES cruise GApr19) in July-August 2023 in the Norwegian and Barents Seas and cover the relatively warm Atlantic Water inflow, fresher water on the Spitzbergen Bank, coastal/glacial outflow around Svalbard, and Arctic water around sea ice. The stainless steel unit comprised a Sea-Bird Electronics (SBE) 9 plus underwater unit, and an SBE 11 plus deck unit; all of which were mounted on a stainless steel 24-way carousel. Attached to the underwater unit were two SBE 3P temperature sensors, two SBE 4C conductivity sensors, one Paroscientific Digiquartz pressure sensor, two SBE 43 dissolved oxygen sensors, two Biospherical QCP Cosine PAR sensors, one WETLabs BBRTD light scattering sensor, one Valeport altimeter one CTG Aquatracka MKIII fluorometer and WETLabs C-star transmissometer. Raw data were initially extracted and processed using Seabird Data Processing Software. Modules DatCnv, WildEdit, Filter, AlignCTD, CellTM and Derive were all run. Custom Matlab routines were then used to remove out of water and surface soak values, to filter anomalous data points and to average the profiles onto a 1 decibar pressure grid. Salinity, chlorophyll-a, and oxygen concentrations were all calibrated against independent in-situ samples. These data were collected to better determine how temperature, light, nutrients, and iron control the distribution and activity of nitrogen fixing organisms in the Arctic Ocean. This dataset was generated by the National Oceanography Centre (NOC) under Natural Environment Research Council (NERC) Discovery grant Nitrogen fixation in the Arctic Ocean, N-ARC (grant numbers NE/T000570/1 and NE/T001240/1).

本数据集包含186个下沉式不锈钢温盐深（CTD, Conductivity, Temperature, Depth）剖面的原位温度、盐度、溶解氧、光学后向散射、光束透射率与衰减率、光合有效辐射（PAR, Photosynthetically Active Radiation）以及叶绿素a荧光数据。本次观测数据采集于2023年7-8月的DY167航次（GEOTRACES航次GApr19），作业海域为挪威海与巴伦支海，覆盖区域包括相对温暖的大西洋水流入区、斯匹次卑尔根浅滩的低盐水体、斯瓦尔巴群岛周边的沿岸/冰川径流区以及海冰环绕的北极水体。该不锈钢集成系统包含海鸟电子（Sea-Bird Electronics, SBE）9+水下单元与SBE 11+甲板单元，所有设备均安装于不锈钢24通道旋转采样架上。水下单元搭载了2台SBE 3P温度传感器、2台SBE 4C电导率传感器、1台帕罗斯科学（Paroscientific）Digiquartz压力传感器、2台SBE 43溶解氧传感器、2台生物光学（Biospherical）QCP余弦式光合有效辐射传感器、1台WETLabs BBRTD光散射传感器、1台韦尔波特（Valeport）高度计、1台CTG Aquatracka MKIII荧光计以及WETLabs C-star透射仪。原始数据首先通过海鸟数据处理软件进行提取与处理，依次运行了DatCnv、WildEdit、Filter、AlignCTD、CellTM与Derive模块。随后使用自定义Matlab脚本剔除水面暴露与表面浸泡数据、过滤异常数据点，并将剖面数据平均至1分巴的压力网格。盐度、叶绿素a与溶解氧浓度均通过独立原位样品完成校准。本数据集的采集旨在阐明温度、光照、营养盐与铁元素如何调控北冰洋固氮生物的分布与活性。本数据集由英国国家海洋学中心（National Oceanography Centre, NOC）依托自然环境研究委员会（Natural Environment Research Council, NERC）的“北冰洋固氮作用（N-ARC）”探索项目资助生成，项目编号为NE/T000570/1与NE/T001240/1。