The data in this archive were collected from CEFAS (Or DFR) research cruises.
These data were collected in the South Indian Ocean. 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.