Metadata Report for BODC Series Reference Number 580716

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

Name	Categories
Aanderaa WLR 7 Water Level Recorder	sea level recorders; water temperature sensor

Instrument Mounting

fixed benthic node

Originating Country

United Kingdom

Originator

Dr Bill Turrell

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	661/W
BODC Series Reference	580716

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm)	2001-04-09 09:45
End Time (yyyy-mm-dd hh:mm)	2001-07-17 13:00
Nominal Cycle Interval	900.0 seconds

Spatial Co-ordinates

Latitude	57.57720 N ( 57° 34.6' N )
Longitude	5.96930 W ( 5° 58.2' W )
Positional Uncertainty	0.05 to 0.1 n.miles
Minimum Sensor or Sampling Depth	0.0 m
Maximum Sensor or Sampling Depth	0.0 m
Minimum Sensor or Sampling Height	27.0 m
Maximum Sensor or Sampling Height	27.0 m
Sea Floor Depth	27.0 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 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)
PREXPS01	1	Decibars	Pressure (measured variable) exerted by the water body by fixed in-situ pressure sensor and corrected to read zero at sea level
TEMPPR01	1	Degrees Celsius	Temperature 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 136. The full dataset was made up from two columns in one file.

There were no headings included in the files to point to which channel refered to which variable. The file had two columns, the first being pressure and the second column was for temperature. The variables were then mapped to the appropriate BODC parameter code which can be seen below:

Variable	Units	BODC parameter code	Units	Comments
Temperature	deg C	TEMPPR01	deg C	-
Pressure	dbar	PREXPS01	dbar	-

Following the transfer the data was 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)	2001-04-09
End Date (yyyy-mm-dd)	2001-07-17
Organization Undertaking Activity	Fisheries Research Services Aberdeen Marine Laboratory (now Marine Scotland Aberdeen Marine Laboratory)
Country of Organization	United Kingdom
Originator's Data Activity Identifier	661w
Platform Category	fixed benthic node

FRS moored Aanderaa Water Level Recorder (WLR) from off Loch Torridon (Rona)

A moored Aanderaa water level recorder (WLR) was deployed by Fisheries Research Services (FRS) off Loch Torridon (Rona) (57.57717° N, 5.96933° W) on 09/04/01 as part of the Clupea 0501c cruise, and recovered on 17/07/01 by the Clupea 0901c cruise. The station had a nominal water depth of 27 m. The WLR had a sampling period of 15 minutes. The data were supplied as current meter records at a depth of 27 m.

The mooring consisted of the following instruments.

Instrument type	Series Nunber	Serial Number	Deployment start	Deployment end	Instrument depth (m)	Comments
Aanderaa WLR 7	661w	940	09/04/2001	17/07/2001	27	-

Cruise

Cruise Name	0501C
Departure Date	2001-04-02
Arrival Date	2001-04-11
Principal Scientist(s)	Phil A Gillibrand (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