Metadata Report for BODC Series Reference Number 343678


Metadata Summary

Data Description

Data Category CTD or STD cast
Instrument Type
NameCategories
Neil Brown Smart CTD  CTD; water temperature sensor; salinity sensor
Instrument Mounting research vessel
Originating Country United Kingdom
Originator -
Originating Organization Scottish Marine Biological Association (now Scottish Association for Marine Science)
Processing Status banked
Project(s) NANSEN
 

Data Identifiers

Originator's Identifier G1/88/001
BODC Series Reference 343678
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1988-10-27 07:25
End Time (yyyy-mm-dd hh:mm) -
Nominal Cycle Interval -
 

Spatial Co-ordinates

Latitude 54.67000 N ( 54° 40.2' N )
Longitude 5.50000 W ( 5° 30.0' W )
Positional Uncertainty Unspecified
Minimum Sensor Depth 0.79 m
Maximum Sensor Depth 27.85 m
Minimum Sensor Height -
Maximum Sensor Height -
Sea Floor Depth -
Sensor Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum -
 

Parameters

BODC CODE Rank Units Short Title Title
PRESPR01 1 Decibars Pres_Z Pressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected to read zero at sea level
PSALPR01 1 Dimensionless P_sal Practical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm
TEMPST01 1 Degrees Celsius WC_temp_CTD Temperature of the water body by CTD or STD
 

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

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

Fixed Station Information

Station NameDML North Channel CTD Stations/Sections
CategoryOffshore area
Latitude54° 58.52' N
Longitude5° 32.50' W
Water depth below MSL

DML North Channel CTD Stations/Sections

The North Channel region, between Northern Ireland and the west coast of Scotland, has been extensively surveyed since the late 1970s (especially in the 1980s) by numerous research and government institutes. The region contains several repeated hydrographic stations, some of which collectively form transects. These repeated survey transects represent the southernmost part of a greater network of similar sections on the western Scottish continental shelf which were established by Dunstaffnage Marine Laboratory (DML).

Map of standard North Channel CTD Stations

BODC image

Map produced using the GEBCO Digital Atlas.

The upwards-pointing triangles indicate the nominal positions of individual Line A stations, the single downwards-pointing triangle indicates the nominal position of the Larne - Stranraer midway station. Nominal positions of Line Y and Z stations are shown by the circles and squares respectively. Measurements made at Northern Channel CTD stations lie within a box bounded by co-ordinates 54.667° N, 6° W at the south west corner and 55.283° N, 5.083° W at the north east corner.

Nominal station details:

DML Line A: Kintyre (Scotland) - Antrim (Northern Ireland)

DML Station LS: Larne (Northern Ireland) - Stranraer (Scotland) midway station

DML Line Y: Corsewall (Stranraer, Scotland) - Sanda Island (Kintyre, Scotland)

DML Line Z: Copeland Islands (Northern Ireland) - Portpatrick (Scotland)

Other Series linked to this Fixed Station for this cruise - 343691 343746 343758 343771 343783 343795

Other Cruises linked to this Fixed Station (with the number of series) - CD10B (16) CD44 (1) CH1/85 (16) CH10/81 (4) CH10/84 (14) CH11/83 (11) CH14 (16) CH2/84 (19) CH25 (16) CH30 (16) CH4/85 (16) CH7A/83 (10) CH8/85 (16) CH86B (15) CH9 (9) CH97 (16) DSK1/86 (18) FR13/85 (14) FR13/87 (12) FR14A/87 (6) FR14B/87 (9) FR7B/86 (5) FR8/86 (14) LF1/89 (17) LF2/89 (16)

Fixed Station Information

Station NameDML Line Z
CategoryOffshore route/traverse

DML Line Z

Line Z is a survey section in the North Channel between Northern Ireland and Stranraer (Scotland). The line comprises six fixed CTD stations, which were established as part of routine monitoring work on the Scottish continental shelf by Dunstaffnage Marine Laboratory (DML). The line was occupied in the 1980s and 1990s.

Nominal station details:

DML Line Z: Copeland Islands (Northern Ireland) - Portpatrick (Stranraer, Scotland)

Station Nominal latitude Nominal longitude Approx.
depth (m)
Comment
1Z 54 40.0' N 05 30.0' W 32 Copeland Islands
2Z 54 41.6' N 05 25.0' W 100  
3Z 54 43.2' N 05 20.0' W 160  
4Z 54 44.8' N 05 15.0' W 270  
5Z 54 46.4' N 05 10.0' W 130  
6Z 54 48.0' N 05 05.0' W 22 Money Head (near Portpatrick)

Other Series linked to this Fixed Station for this cruise - 343691 343746 343758 343771 343783 343795

Other Cruises linked to this Fixed Station (with the number of series) - CD10B (6) CH1/85 (6) CH10/84 (12) CH11/83 (6) CH14 (6) CH2/84 (12) CH25 (6) CH30 (6) CH4/85 (6) CH7A/83 (6) CH8/85 (6) CH86B (6) CH97 (6) DSK1/86 (6) FR13/85 (4) FR13/87 (4) FR14A/87 (6) FR7B/86 (5) FR8/86 (5) LF1/89 (7) LF2/89 (6)

Fixed Station Information

Station NameDML Line Z Station 1Z
CategoryOffshore location
Latitude54° 40.00' N
Longitude5° 30.00' W
Water depth below MSL32.0 m

DML Station 1Z

Station 1Z is one of six fixed CTD stations between Northern Ireland and Stranraer (Scotland), established by scientists at Dunstaffnage Marine Laboratory (DML).

Other Cruises linked to this Fixed Station (with the number of series) - CD10B (1) CH1/85 (1) CH10/84 (2) CH11/83 (1) CH14 (1) CH2/84 (2) CH25 (1) CH30 (1) CH4/85 (1) CH7A/83 (1) CH8/85 (1) CH86B (1) CH97 (1) DSK1/86 (1) FR13/85 (1) FR14A/87 (1) LF1/89 (1) LF2/89 (1)


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