RV CIROLANA 01/1991 Low Resolution Conductivity-Temperature-Depth (CTD) Data

The data held in this archive were collected from Cefas (or its predecessor
the Directorate of Fisheries Research) 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.

本档案中保存的数据源自Cefas（或其前身渔业研究局）的研究航行。这些数据广泛覆盖了欧洲大陆架，并包含伊比利亚海盆的一些数据。数据采集采用了下放式CTD罗塞特系统，该系统适用于船舶静止时使用。通常在特定深度投放瓶体进行采样，并收集样本以进行校准。早期年份仅收集了有限的参数，特别是压力（深度）、温度和电导率（CTD）。通过电导率，可利用联合国教科文组织1978年、1983年的公式计算出盐度。在随后的年份中，增加了更多传感器，特别是荧光计、光学后向散射或透射计以及光照（如光合有效辐射）。具体的配置因航行而异，并在输出文件的数据格式中得到体现。在站点的科研船舶上采集的数据，从海面至近海底进行剖面测量，下投数据应形成干净的剖面。用于样本采集和校准的水瓶在上投过程中投放。