Metadata Report for BODC Series Reference Number 550407
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
Data Description |
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Data Identifiers |
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Time Co-ordinates(UT) |
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Spatial Co-ordinates | |||||||||||||||||||||||||
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Parameters |
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Problem Reports
Salinity noise up to 0.02 PSU.
Data Access Policy
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."
Narrative Documents
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 16/80 CTD Data Documentation
Introduction
Documentation for the CTD data collected on RRS Challenger Cruise 16/80 (29 August - 9 September 1980) by the Institute of Oceanographic Sciences, Bidston (now POL).
| Port of Departure | Liverpool |
|---|---|
| Port of Return | Barry |
| Area | Celtic Sea |
Caution
Some of the salinity data collected on this cruise are noisy (±0.02 psu)
Data Processing
The raw data were previously manually edited, resequenced and archived in 2 files. 0ne file contained temperature, salinity and depth frequencies and time elapsed the other contained decca positional infomation.
These data were reprocessed in Febuary 2001.
Calibrations
The following constants (obtained from printouts of the data) were used to convert to real units and calibrate.
| Temperature Constant | 2128.1 |
|---|---|
| Salinity Constant | 5001.3 |
| Depth Constant | 9748.7 |
The downcasts had a temperature correction applied to lessen salinity spiking.
REALT = TC(2) + ((TC(3)-TC(1))/2.0) * TIC
where:
TC(1-3) = Three successive readings of temperature (°C)
TIC = Timing constant of the instrument = 0.35
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Cruise
| Cruise Name | CH16/80 |
| Departure Date | 1980-10-17 |
| Arrival Date | 1980-10-30 |
| Principal Scientist(s) | M John Howarth (Institute of Oceanographic Sciences Bidston Laboratory) |
| Ship | RRS Challenger |
Complete Cruise Metadata Report is available here
Fixed Station Information
No Fixed Station Information held for the Series
BODC Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
| Flag | Description |
|---|---|
| Blank | Unqualified |
| < | 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.) |
| D | Thermometric depth |
| E | End of CTD Down/Up Cast |
| G | Non-taxonomic biological characteristic uncertainty |
| H | Extrapolated value |
| 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 |
| N | Null value |
| O | Improbable value - user quality control |
| P | Trace/calm |
| Q | Indeterminate |
| R | Replacement value |
| S | Estimated value |
| T | Interpolated value |
| U | Uncalibrated |
| W | Control value |
| X | Excessive difference |
SeaDataNet Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
| Flag | Description |
|---|---|
| 0 | no quality control |
| 1 | good value |
| 2 | probably good value |
| 3 | probably bad value |
| 4 | bad value |
| 5 | changed value |
| 6 | value below detection |
| 7 | value in excess |
| 8 | interpolated value |
| 9 | missing value |
| A | value phenomenon uncertain |
| B | nominal value |
| Q | value below limit of quantification |
