1999 - 1999 Centre for Environment, Fisheries & Aquaculture Science (Cefas) RV CIROLANA 01/1999 High Resolution Conductivity-Temperature-Depth (CTD) Data

The data in this archive were collected from CEFAS (Or DFR) research cruises. They broadly cover the European Shelf with some data from the Iberian Abyssal Plain. Data were collected using the lowered CTD rosette system which is used when the vessel is stationary. Usually bottles were fired at particular depths and samples taken for calibration. In early years only a limited set of parameters were collected. Notably Pressure (Depth), Temperature and Conductivity (CTD). From Conductivity Salinity can be calculated using the UNESCO 1978,1983 formulations . In subsequent years more sensors have been added, notably fluorometers, Optical back scatter or transmissometers and Light (PAR, photo synthetically available radiation). The exact configuration varies between cruises and this is reflected in the data format of the output files. Data was collected from research vessels on station, a profile from the surface to near the sea bed is undertaken. The down cast data should be a clean profile. Water bottles for sample collection and calibration are fired on the up cast.本归档数据集采集自CEFAS（或DFR）组织的科研航次。数据覆盖范围基本涵盖欧洲陆架，同时包含部分来自伊比利亚深海平原的观测资料。数据采用下放式CTD罗塞特采水系统采集，该系统仅在科研船停航状态下投入使用。通常会在预设深度触发采水器，采集样本用于仪器校准。早期航次仅采集有限的参数集，核心参数包括压力（水深）、温度与电导率（CTD）。可基于电导率数据，通过联合国教科文组织1978、1983年发布的标准公式计算盐度。后续航次新增了更多传感器，主要包括荧光计、光后散射仪、透射仪以及光合有效辐射（PAR，Photosynthetically Available Radiation）传感器。各航次的仪器配置存在差异，这一差异也体现在输出文件的数据格式中。 数据由驻站科研船采集，观测剖面覆盖从海面至近海底的全水层。下行剖面数据应为无干扰的干净剖面，用于样本采集与校准的采水器将在上行剖面阶段触发。