Metadata Report for BODC Series Reference Number 47258
No Problem Report Found in the Database
Open Data supplied by Natural Environment Research Council (NERC)
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Aanderaa Pressure Recorder Type TG-4A
The Aanderaa recorder uses a Digiquartz type 2-300a quartz crystal pressure transducer. The pressure sensor consists of a convoluted bellows linked to a 40kHz quartz crystal resonator coupled by piezoelectric action to an electronic resonator. Data are recorded on to 0.25 inch magnetic tape on an Aanderaa data logger in the same case. A quartz crystal clock is used for controlling the sampling interval.
The data are recorded as 10 bit binary words in serial form with the frequency count from the sensor stored as the most and least significant counts. The pressure recorder is a deep water instrument and is usually deployed on a pop up mooring.
Data Processing Notes
Instrument samples temperature and pressure alternately, therefore interval between 2 consecutive pressure values is 1 hour. Clock lost 50 seconds over 172 days 16 hours 0 minutes 50 seconds; original cycle interval and time values have been corrected. Instrumental drift large - approximately 3001 millibars.
|Aanderaa 4A sensor||281/3|
|Nominal sampling interval||3600 seconds|
|Integration period||27 seconds|
|Actual sampling interval||60.000202 minutes|
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|
|Q||value below limit of quantification|