INFORMATION FOR BODC SERIES REF. NO. 41576
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Sea Floor Pressure Gauge Inventory Number : 7044
Start Time : 04 Jan 1979 0928 GMT Latitude : 17deg 04.2min S
End Time : 04 Mar 1979 0029 GMT Longitude : 013deg 39.6min W
Nominal Cycle Interval : 3600.0 secs Sensor Depth : 2700.00m
Sea Floor Depth : 2700.00m
Positional Uncertainty : 0.1 to 0.5 n.miles
Depth Datum : Instantaneous
Data Category : Offshore sea floor pressure series
Instrument Type : Tide gauge (unspecified)
Instrument Mounting : Sea floor - fixed
Originator Laboratory : Proudman Oceanographic Laboratory, Bidston, UK
Originator's Identifier : T7DP6/PDFH1
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Additional information stored with the data:
Clock lost 1 minutes 19 seconds over 64 days 11 hours 1 minute 19 seconds;
the cycle interval and time values have been corrected.
Instrument Characteristics
Station T7
OSTG Mark IV Sensors SG 1/D3 (BODC Series Ref. 41552)
DIG 2291 (BODC Series Ref. 41564)
SG 2/D3 (BODC Series Ref. 41576)
Nominal sampling interval 225 seconds
Integration period 225 seconds
This instrument was deployed on the same frame as an Aanderaa tide gauge.
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I.O.S. Data Processing of Off-Shore Pressure Recorder Data 3
Data processing comprises 2 stages:-
1. Instrumental drift and depth are removed, thus the drift free series is
produced with an artificial mean of zero.
2. Generally the pressure values have been obtained by integration and
averaging over the sampling interval, followed by logging; hence the
time value assigned to a data cycle has been chosen as the mid-point
between the start and end time of each interval. Some pressure records
have been sample rate reduced from the basic time step of the recorder
to produce either hourly or 15 minute values, incorporating any timing
corrections due to clock error.
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The following additional documents apply to this series:
32414; I.O.S. Mk IV Pressure Recorder
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