Planned maintenance — 28th March 2017 between 09:00 and 11:30 BST [more]
Metadata Report for BODC Series Reference Number 549222
Salinity noise up to 0.02 PSU.
Open Data supplied by Natural Environment Research Council (NERC)
You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."
Bissett-Bermann 9040 Conductivity Temperature and Depth
The basic configuration of the B-B 9040 CTD incorporates pressure, temperature and conductivity sensors which could be logged digitally. This system also made it possible to derive other parameters, such as salinity, depth and sound velocity.
The instrument was versatile and it was possible to attach a dissolved oxygen sensor or to change the CTD housing, allowing it to obtain data from deeper layers in the water column. The accuracy for salinity is ±0.02 ppt , and ±0.02°C for temperature.
This instrument was also known as the Plessey 9040.
RRS Challenger 8/78 CTD Data Documentation
Documentation for the CTD data collected on RRS Challenger Cruise 8/78 (12-24 May 1978) by the Institute of Oceanographic Sciences, Bidston (now POL)
|Port of Departure||Barry|
|Port of Return||Barry|
Some of the salinity data collected on this cruise are noisy (±0.02 psu)
The raw data were previously manually edited, resequenced and archived in 2 files. 0ne file contained temperature, salinity and depth frequencies and time elapsed and the other contained decca positional infomation.
These data were reprocessed in Febuary 2001.
The following constants (obtained from printouts of the data) were used to convert to real units and calibrate.
The downcasts had a temperature correction applied to lessen salinity spiking.
REALT = TC(2) + ((TC(3)-TC(1))/2.0) * TIC
TC(1-3) = Three successive readings of temperature (in °C)
TIC = Timing constant of the instrument = 0.35
No Project Information held for the Series
|Principal Scientist(s)||Alan J Harrison (Institute of Oceanographic Sciences Bidston Laboratory)|
Complete Cruise Metadata Report is available here
No Fixed Station Information held for the Series
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
|<||Below detection limit|
|>||In excess of quoted value|
|A||Taxonomic flag for affinis (aff.)|
|B||Beginning of CTD Down/Up Cast|
|C||Taxonomic flag for confer (cf.)|
|E||End of CTD Down/Up Cast|
|G||Non-taxonomic biological characteristic uncertainty|
|I||Taxonomic flag for single species (sp.)|
|K||Improbable value - unknown quality control source|
|L||Improbable value - originator's quality control|
|M||Improbable value - BODC quality control|
|O||Improbable value - user quality control|
|0||no quality control|
|2||probably good value|
|3||probably bad value|
|6||value below detection|
|7||value in excess|
|A||value phenomenon uncertain|