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Metadata Report for BODC Series Reference Number 636175


Metadata Summary

Data Description

Data Category Offshore sea floor pressure series
Instrument Type
NameCategories
Aanderaa WLR 7 Water Level Recorder  sea level recorders; water temperature sensor
Instrument Mounting fixed benthic node
Originating Country United Kingdom
Originator Ms Sarah Hughes
Originating Organization Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) -
 

Data Identifiers

Originator's Identifier 692/W
BODC Series Reference 636175
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2003-11-20 09:35
End Time (yyyy-mm-dd hh:mm) 2003-11-21 16:35
Nominal Cycle Interval 300.0 seconds
 

Spatial Co-ordinates

Latitude 57.12483 N ( 57° 7.5' N )
Longitude 5.67583 W ( 5° 40.5' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth 22.0 m
Maximum Sensor or Sampling Depth 22.0 m
Minimum Sensor or Sampling Height 0.0 m
Maximum Sensor or Sampling Height 0.0 m
Sea Floor Depth 22.0 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 Sea floor reference - Depth measured as a height above sea floor but converted into a depth relative to the sea surface according to the same datum as used for sea floor depth (applicable to instrument depths not bathymetric depths)
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters

BODC CODERankUnitsTitle
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
PREXPS011DecibarsPressure (measured variable) exerted by the water body by fixed in-situ pressure sensor and corrected to read zero at sea level
TEMPPR011Degrees CelsiusTemperature of the water body

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

Public domain data

These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

The recommended acknowledgment is

"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."


Narrative Documents

Aanderaa Water Level Recorder Model 7

The Water Level Recorder (WLR) model 7 is a self-contained, high precision instrument specifically designed for recording of ocean water levels through precise measurement of hydrostatic pressure. The WLR records pressure, temperature and conductivity (optional) at regular intervals, enabling precise variations in water level to be calculated. The pressure sensor consists of an oscillating quartz crystal which shifts frequency with the force applied to it. Temperature is measured by a Fenwall thermistor.

The data from the WLR7 are stored in a solid-state data storage unit (DSU) which can store up to 65,500 ten bit, PDC-4 coded words in a set of EEPROMS. Click the link for further details on theWLR7.

Specifications

Pressure

Oscillator Frequency 36-40 kHz
Resolution 0.001% of range
Repeatability ± 0.01% of full scale
Integration 40 s
Ranges available 0 - 700 kPA (60 m) (standard)
0 - 3500 kPa (340 m) (standard)

Temperature

The thermistor is a Fenwall GB32JM19

Range -3 °C to +35 °C
Accuracy ± 0.1 °C
Resolution 0.04 °C
Response Time 30 s

Conductivity (optional)

Sensor Type Conductivity Cell 3094
Ranges 0 - 77 mmho cm-1 (standard)
0 - 42 mmho cm-1 (on request)
Accuracy ± 0.25 mmho cm-1
Resolution 0.1% of range

Further details can be found in the manufacturer's specification sheet.

BODC processing

The data were provided to BODC in ascii format and were transferred to qxf format by BODC produced Matlab transfer 325.

The variables were then mapped to the appropriate BODC parameter code which can be seen below:

Variable Units BODC parameter code Units Comments
Pressure dbar PREXPS01 dbar -
Temperature deg C TEMPTC01 deg C -

Following the transfer the data were screened using the BODC in-house visualisation software, EDSERPLO. Any suspect data points were flagged with the appropriate BODC flag code.

Originator's data processing

The data from the Vemco Miniloggers were merged to form "pseudo" thermistor chain records prior to being supplied to BODC.

FRS applied the standard manufaturers' calibrations to all data, and produced ascii files for submission to BODC.


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2003-11-20
End Date (yyyy-mm-dd) 2003-11-21
Organization Undertaking ActivityFisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Country of OrganizationUnited Kingdom
Originator's Data Activity Identifier692w
Platform Categoryfixed benthic node

FRS moored Aanderaa water level recorder (WLR) from Loch Hourn

A bottom mounted Aanderaa WLR was deployed by Fisheries Research Services (FRS) in Loch Hourn(57.12483° N, 5.67583° W) on 20/11/03 as part of the Scotia 1703s cruise, and recovered on 21/11/03 by the Clupea 1903c cruise. The station had a nominal water depth of 22 m and the WLR had a sampling period of 10 minutes. The instrument was deployed at a depth of 22 m.

The mooring consisted of the following instruments.

Instrument type Series Number Serial Number Deployment start Deployment end Instrument depth (m) Comments
Aanderaa WLR 692W 940 20/11/2003 21/11/2003 22 -

Cruise

Cruise Name 1703C
Departure Date 2003-10-09
Arrival Date 2003-10-24
Principal Scientist(s)James A M Kinnear (Fisheries Research Services Aberdeen Marine Laboratory)
Ship FRV Clupea

Complete Cruise Metadata Report is available here


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
B nominal value
Q value below limit of quantification