Metadata Report for BODC Series Reference Number 343734
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 |
|||||||||||||||||||||||||
|
|||||||||||||||||||||||||
Data Identifiers |
|||||||||||||||||||||||||
|
|||||||||||||||||||||||||
Time Co-ordinates(UT) |
|||||||||||||||||||||||||
|
|||||||||||||||||||||||||
Spatial Co-ordinates | |||||||||||||||||||||||||
|
|||||||||||||||||||||||||
Parameters |
|||||||||||||||||||||||||
|
|||||||||||||||||||||||||
|
Problem Reports
No Problem Report Found in the Database
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
Neil Brown Smart Conductivity, Temperature and Depth profiler
The Smart CTD was developed by WHOI, Neil Brown Instrument Systems and MIT and consists of an internally recording CTD which can be programmable to accommodate various sampling schemes. The data retrieval is done via connectors to a computer, where it is digitally logged.
This instrument was designed to be used with minimal technical expertise and to be replaced if problems arise, rather than being repaired at sea.
RV Gorsethorn Cruise 1/88 CTD Data Documentation
Introduction
Documentation for the CTD data collected on RV Gorsethorn 1/88 (October - November 1988) by the Scottish Marine Biological Association, Oban, Argyll, Scotland, UK, under the direction of D. J. Ellett.
Instrumentation
The instrument used was a Neil Brown CTD system. Instrument lowering and raising speeds were between 0.5m/s and 1m/s. An acoustic pinger was placed above the CTD to give an accurate depth measurement, this could then be used to check the CTD pressure calibration. An NIO bottle with reversing thermometers was placed above the pinger, within 2m of the CTD system. A bottle sample was taken at the bottom of the cast providing the temperature and salinity are uniform at that point. If large temperature or salinity gradients were present then the bottle sample was triggered at a suitable site on the upcast. A surface salinity sample was also taken at the start of the dip.
Calibration and Data Quality
The CTD was not calibrated in the laboratory. The manufacturer's calibration was used.
Data Processing
Obvious wild points were edited out of the data and the manufacturer's calibration was applied. Conductivities were converted to conductivity ratios and then converted to salinities using UNESCO recommended routines and sigma-t was calculated. The data values were then sieved to ensure a minimum separation between pressure values of 1 dbar. The data were then visually inspected and major spikes flagged.
Reference
Fofonoff, N.P. and Millard Jr., R.C. (1983).
Algorithms for the computation of fundamental properties of sea water. UNESCO Technical Paper on Marine Science 44.
Project Information
North Atlantic Norwegian Sea Exchange (NANSEN)
The North Atlantic Norwegian Sea Exchange (NANSEN) Project was conceived by the ICES Oceanic Hydrography Working Group, and arose from discussions centred around the oceanography of the southeast of Iceland and of the Faroese channels. NANSEN was not a closely coordinated one time survey, but rather provided a framework through which work in these areas could be encouraged.
Several UK cruises were undertaken in support of NANSEN, collecting both moored current meter and CTD data.
Data Activity or Cruise Information
Cruise
Cruise Name | GTH1/88 |
Departure Date | 1988-10-23 |
Arrival Date | 1988-11-06 |
Principal Scientist(s) | David J Ellett (Scottish Marine Biological Association) |
Ship | MV Gorsethorn |
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 |