Metadata Report for BODC Series Reference Number 47363

Metadata Summary

Data Description

Data Category Offshore sea floor pressure series
Instrument Type
Institute of Oceanographic Sciences MkIV bottom pressure recorder  sea level recorders
Instrument Mounting fixed benthic node
Originating Country United Kingdom
Originator -
Originating Organization Institute of Oceanographic Sciences Bidston Laboratory (now National Oceanography Centre, Liverpool)
Processing Status banked
Project(s) CONSLEX

Data Identifiers

Originator's Identifier SF3DP5
BODC Series Reference 47363

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 1982-10-04 06:00
End Time (yyyy-mm-dd hh:mm) 1983-02-20 00:00
Nominal Cycle Interval 3600.0 seconds

Spatial Co-ordinates

Latitude 61.40330 N ( 61° 24.2' N )
Longitude 2.09330 W ( 2° 5.6' W )
Positional Uncertainty 0.1 to 0.5 n.miles
Minimum Sensor Depth 1025.0 m
Maximum Sensor Depth 1025.0 m
Minimum Sensor Height 0.0 m
Maximum Sensor Height 0.0 m
Sea Floor Depth 1025.0 m
Sensor Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface


BODC CODE Rank Units Short Title Title
AADYAA01 1 Days Date(Loch_Day) Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01 1 Days Time(Day_Fract) Time (time between 00:00 UT and timestamp)
PPSSRL01 1 Decibars RelBotPress Pressure (measured variable) exerted by the water body by fixed in-situ pressure sensor and corrected using co-located air pressure data expressed to unspecified datum by subtraction of a constant

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

IOS Mk IV Pressure Recorder

This instrument was developed at I.O.S. Bidston and is a deep water pressure recorder (i.e. used at depths between 300m and 5000m). Each recorder consists of one or two Bell and Howell strain gauges and/or a Digiquartz pressure sensor and a temperature sensor.

The sensors are interfaced into a Seadata cassette recording system. Sampling is usually every 3.75 minutes with the integration period equal to the sampling interval, but may be set to other sampling intervals. For example with a 3 second sampling interval and integration period the instrument may be used as a wave recorder.

The recorder is housed in a tubular aluminium frame 1.3m in diameter by 1.4m in height attached to a disposable steel ballast weight. The data logger together with the associated battery supply is lowered into a central 15cm (internal diameter) aluminium tube. Sensors are mounted externally with Marsh Marine connectors. The assembly free falls to the sea floor. An acoustic release system is used to separate the ballast weight and buoyancy is provided by Corning glass spheres attached to the aluminium frame.

Data Processing Notes

Clock lost 1 minute 7 seconds over 175 days 19 hours 31 minutes 7 seconds; the original cycle interval and time values have been corrected. Batteries failed on sensor B+H5 (BODC series reference 47363) near the end of the deployment period. This sensor was much noisier than sensor DQ 3845 (BODC series reference 47375) for the first 10 days of deployment. Drift on sensor DQ 3845 was small (approximately 12 millibars).

Instrument characteristics

Station F3

OSTG Mark IV No. 2
Sensors B+H5 (BODC series reference 47363)
DQ 3845 (BODC series reference 47375)
Nominal sampling interval 225 seconds
Integration period 225 seconds
Actual sampling interval 225.00099 seconds

IOS Data Processing of Off-Shore Pressure Recorder Data

Data processing consists of two stages:-

  1. Pressures have been sample rate reduced from the basic time step of the recorder to produce the hourly values and have been interpolated by a cubic spline to generate the value on cardinal hours.

  2. Instrumental drift has been removed and the drift free series is produced with an artificial mean value, usually of 100mbar.

Project Information

Continental Slope Experiment (CONSLEX)

The Continental Slope Experiment (CONSLEX) was a collaborative exercise between the Institute of Oceanographic Sciences, Scottish Marine Biological Association, Department of Agriculture and Fisheries for Scotland and the Ministry of Agriculture, Fisheries and Food designed to study water movements across the Scottish continental slope.

The experiment ran from August/September 1982 to February/March 1983. The deployments, mainly current meter moorings, were made along a set of lines defined thus:

Line Position Number of
P 51° 41' N,15° 26' W to 51° 41' N,14° 55' W 4
A 57° 18' N,09° 53' W to 57° 23' N,08° 30' W 9
B 58° 11' N,09° 57' W to 57° 57' N,08° 50' W 7
C 59° 11' N,07° 43' W to 59° 00' N,07° 22' W 6
D 59° 46' N,06° 16' W to 59° 37' N,05° 58' W 4
E 60° 31' N,05° 00' W to 60° 05' N,04° 29' W 5
F 61° 27' N,02° 13' W to 61° 08' N,01° 33' W 6
G 63° 07' N,00° 00' W to 61° 30' N,00° 00' W 6

Bottom-mounted pressure gauges were deployed at either end of lines A-G and four temporary tide gauges were installed from Sligo (Eire) to Shetland. The current meter temperature sensors were supplemented by three thermistor chain deployments.

Data Activity or Cruise Information

No Data Activity or Cruise Information held for the Series

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