Metadata Report for BODC Series Reference Number 47210
No Problem Report Found in the Database
Open Data supplied by Natural Environment Research Council (NERC)
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Aanderaa Current Meter/Pressure Recorder
The instrument comprises a bottom mounted rig which utilises a Digiquartz sensor and an Aanderaa current meter (with the adaption of a small vane replacing the normal vane) both interfaced into a modified Aanderaa current meter logger. Current meter speed and absolute pressure count are integrated over a pre-selected period (usually 10 or 15 minutes) and sampled by the logger at the same pre-selected time interval, together with spot readings of vane direction, temperature, elapsed time and rig orientation. The pressure sensor consists of a convoluted bellows linked to a 40kHz quartz crystal resonator coupled by piezoelectric action to an electronic resonator. A quartz crystal clock is used for controlling the sampling interval.
The data are recorded on magnetic tape as 10 bit binary words in serial form with the frequency count from the pressure sensor stored as most and last significant counts. The pressure sensor pack, containing the Digiquartz type 2-300a quartz crystal pressure transducer but no temperature transducer, is mounted approximately 1m above the rig base, with the current meter 0.7m above the base. The rig is 1.5m in height and the base is formed by a tripod with legs of length approximately 0.7m. The current meter/pressure recorder is usually deployed using a U-shaped mooring (i.e. buoy or pellet float to wire rope to tide gauge to ground line to anchor to wire rope to buoy), but W-shaped moorings are used in conjunction with either current meters or thermistor chains. A W-shaped mooring comprises pellet float to pellet line to sub-surface buoy to current meter or thermistor line to anchor weight to ground line to tide gauge to ground line to anchor weight to wire rope to surface buoy.
Data Processing Notes
No final timing check was carried out, thus no timing information available.
|Bottom mounted current meter/tide gauge||Sensor DQ 4144|
|Nominal sampling interval||900 seconds|
|Integration period||900 seconds|
IOS Data Processing of Off-Shore Pressure Recorder Data
Data processing consists of two stages:-
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.
Instrumental drift has been removed and the drift free series is produced with an artificial mean value, usually of 100mbar.
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.
No Data Activity or Cruise Information held for the Series
No Fixed Station Information held for the Series
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
|<||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.)|
|E||End of CTD Down/Up Cast|
|G||Non-taxonomic biological characteristic uncertainty|
|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|
|O||Improbable value - user quality control|
|0||no quality control|
|2||probably good value|
|3||probably bad value|
|6||value below detection|
|7||value in excess|
|A||value phenomenon uncertain|