Metadata Report for BODC Series Reference Number 36783

Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags

Metadata Summary

Data Description

Data Category	Offshore sea floor pressure series
Instrument Type	Tide gauge (unspecified)
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
Online delivery of data	Download available - Ocean Data View (ODV) format
Project(s)	-

Data Identifiers

Originator's Identifier	B1AP0/P.DFH0
BODC Series Reference	36783

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm)	1980-08-05 12:00
End Time (yyyy-mm-dd hh:mm)	1980-12-09 14:00
Nominal Cycle Interval	3600.0 seconds

Spatial Co-ordinates

Latitude	45.98490 N ( 45° 59.1' N )
Longitude	46.44490 W ( 46° 26.7' W )
Positional Uncertainty	0.1 to 0.5 n.miles
Minimum Sensor or Sampling Depth	697.0 m
Maximum Sensor or Sampling Depth	697.0 m
Minimum Sensor or Sampling Height	0.0 m
Maximum Sensor or Sampling Height	0.0 m
Sea Floor Depth	697.0 m
Sea Floor Depth Source	-
Sensor or Sampling Distribution	Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor or Sampling 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

Parameters

BODC CODE	Rank	Units	Title
AADYAA01	1	Days	Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01	1	Days	Time (time between 00:00 UT and timestamp)
PPSSRL01	1	Decibars	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

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 every hour, 28 seconds before the hour, for 56 seconds. Clock gained 6 seconds over 123 days 2 hours 59 minutes 54 seconds; no correction made.

Instrument Characteristics

Station B1

Canadian Aanderaa	(BODC Series Ref. 36783)
Nominal sampling interval	3600secs
Integration period	56secs

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.

Project Information

No Project Information held for the Series

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