CTD profiles (chlorophyll, density, dissolved oxygen concentration, conductivity, optical backscatter, salinity, temperature, transmittance, pressure, down-welling PAR) collected during UK Shelf Sea Biogeochemistry cruise RRS Discovery DY018.

This dataset contains in-situ sensor data from 93 CTD casts (downcast profiles and at upcast bottle firings) collected in the Celtic Sea. The measurements were collected during RRS Discovery cruise DY018 in November-December 2014, as part of the UK Shelf Sea Biogeochemistry research programme (SSB), in order to provide information on the water mass characteristics and water column structure across the Celtic Sea shelf. Measurements were carried out using stainless steel and titanium CTD units. The steel unit comprised a Sea-Bird Electronics (SBE) 9 plus underwater unit, an SBE 11 plus deck unit, a 24-way SBE 32 carousel and 24 10 L TMF Water Samplers; all of which were mounted on a stainless steel 24-way CTD frame. Attached to the CTD were two SBE 3P temperature sensors, two SBE 4C conductivity sensors, one Paroscientific Digiquartz pressure sensor, one SBE 43 dissolved oxygen sensor, two Biospherical QCP Underwater PAR sensors, one WETLabs BBRTD light scattering sensor, one Benthos 916T altimeter one CTG Aquatracka MKIII fluorometer and one CTG Alphatracka MKII transmissometer. The titanium unit comprised a Sea-Bird Electronics (SBE) 9 plus underwater unit, an SBE 11 plus deck unit, a 24-way SBE 32 carousel and 24 10 L TMF Water Samplers; all of which were mounted on a stainless steel 24-way CTD frame. Attached to the CTD were two SBE 3P temperature sensors, two SBE 4C conductivity sensors, one Paroscientific Digiquartz pressure sensor, one SBE 43 dissolved oxygen sensor, one WETLabs BBRTD light scattering sensor, one Benthos 916T altimeter one CTG Aquatracka MKIII fluorometer, one CTG Alphatracka MKII transmissometer and one RDI Workhorse Monitor 300 kHz Lowered Acoustic Doppler Current Profiler (LADCP). Raw data were initially extracted and processed using Seabird Data Processing Software. Modules DatCnv, WildEdit, Filter, AlignCTD, CellTM, Derive and BottleSum 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 db pressure grid. Data were calibrated by comparison with independent samples (where available). Measurements at upcast bottle firings were also calibrated (when possible). The data were collected as part of the SSB research programme in the CaNDyFloSS: Carbon and Nutrient Dynamics and Fluxes over Shelf Systems (NE/K00185X/1) research programme component. SSB was co-funded by the Natural Environment Research Council (NERC) and the Department for Environment, Food and Rural Affairs (Defra). The programme took a holistic approach to the cycling of nutrients and carbon and the controls on primary and secondary production in UK and European shelf seas, to increase understanding of these processes and their role in wider biogeochemical cycles. The British Oceanographic Data Centre (BODC) created the metadata entry and is responsible for holding master copies of the data.

本数据集包含来自凯尔特海的93次温盐深仪（Conductivity-Temperature-Depth, CTD）施放作业的现场传感器数据，涵盖下行剖面数据与上行采水作业时的观测数据。
本次观测数据采集于2014年11至12月的RRS“发现号”（RRS Discovery）巡航DY018航次，作为英国陆架海生物地球化学（UK Shelf Sea Biogeochemistry, SSB）研究计划的一部分，旨在获取凯尔特海陆架区域的水团特征与水柱结构相关信息。
观测采用不锈钢与钛合金材质的CTD单元。不锈钢CTD单元包含海鸟电子（Sea-Bird Electronics, SBE）9 Plus水下探头、SBE 11 Plus甲板单元、24通道SBE 32旋转采水架与24个10升TMF采水器，所有设备均安装于不锈钢24通道CTD框架之上。该CTD搭载的传感器包括：2台SBE 3P温度传感器、2台SBE 4C电导率传感器、1台Paroscientific Digiquartz压力传感器、1台SBE 43溶解氧传感器、2台Biospherical QCP水下光合有效辐射（Photosynthetically Active Radiation, PAR）传感器、1台WETLabs BBRTD光散射传感器、1台Benthos 916T高度计、1台CTG Aquatracka MKIII荧光计与1台CTG Alphatracka MKII透射率计。
钛合金CTD单元同样包含Sea-Bird Electronics（SBE）9 Plus水下探头、SBE 11 Plus甲板单元、24通道SBE 32旋转采水架与24个10升TMF采水器，所有设备均安装于不锈钢24通道CTD框架之上。该CTD搭载的传感器包括：2台SBE 3P温度传感器、2台SBE 4C电导率传感器、1台Paroscientific Digiquartz压力传感器、1台SBE 43溶解氧传感器、1台WETLabs BBRTD光散射传感器、1台Benthos 916T高度计、1台CTG Aquatracka MKIII荧光计、1台CTG Alphatracka MKII透射率计，以及1台RDI Workhorse Monitor 300 kHz下放式声学多普勒流速剖面仪（Lowered Acoustic Doppler Current Profiler, LADCP）。
原始数据首先通过海鸟数据处理软件完成提取与预处理，依次运行了DatCnv、WildEdit、Filter、AlignCTD、CellTM、Derive及BottleSum等模块。随后采用自定义Matlab程序剔除脱离水体与表面浸泡的观测值、过滤异常数据点，并将剖面数据插值至1分巴的压力网格中。数据通过与独立样本（若有）比对完成校准，上行采水作业时的观测数据亦在可行范围内完成校准。
本数据集隶属于SSB研究计划下设的CaNDyFloSS：陆架系统碳与养分动态及通量（Carbon and Nutrient Dynamics and Fluxes over Shelf Systems, NE/K00185X/1）研究子项目。SSB计划由英国自然环境研究委员会（Natural Environment Research Council, NERC）与环境、食品与农村事务部（Department for Environment, Food and Rural Affairs, Defra）联合资助。该计划采用整体系统研究方法，针对英国与欧洲陆架海的养分与碳循环，以及初级、次级生产的调控机制展开研究，以加深对上述过程及其在全球生物地球化学循环中作用的理解。
英国海洋数据中心（British Oceanographic Data Centre, BODC）负责创建本数据集的元数据条目，并负责保管数据的主副本。