Metadata Report for BODC Series Reference Number 1044314


Metadata Summary

Data Description

Data Category Hydrography time series at depth
Instrument Type
NameCategories
Sea-Bird SBE 37-SM MicroCAT C-T Sensor  water temperature sensor; salinity sensor
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Ms Sarah Hughes
Originating Organization Marine Scotland Aberdeen Marine Laboratory
Processing Status banked
Project(s) -
 

Data Identifiers

Originator's Identifier 783/3
BODC Series Reference 1044314
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-05-21 12:32
End Time (yyyy-mm-dd hh:mm) 2010-11-29 13:06
Nominal Cycle Interval 120.0 seconds
 

Spatial Co-ordinates

Latitude 60.16667 N ( 60° 10.0' N )
Longitude 0.16617 W ( 0° 10.0' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 113.0 m
Maximum Sensor Depth 113.0 m
Minimum Sensor Height 11.0 m
Maximum Sensor Height 11.0 m
Sea Floor Depth 124.0 m
Sensor Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor 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 Short Title Title
AADYAA01 1 Days Date(Loch_Day) Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01 1 Days Time(Day_Fract) Time (time between 00:00 UT and timestamp)
PREXPS01 1 Decibars MeasPress_SL Pressure (measured variable) exerted by the water body by fixed in-situ pressure sensor and corrected to read zero at sea level
PSALPR01 1 Dimensionless P_sal Practical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm
TEMPPR01 1 Degrees Celsius Temp 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 quality report

The salinity and temperature data are noisy throughout and should be treated with caution. No flags have been applied to the data as it is impossible to identify a point at which the decline in quality begins.


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

Sea-Bird SBE 37-SM MicroCAT

The SBE 37-SM MicroCAT is a high accuracy conductivity and temperature recorder (pressure optional). Designed for moorings and other long-duration, fixed-site deployments, MicroCATs have non-corroding titanium housings rated for operation to 7000 metres or pressure sensor full scale-range. Communication with the MicroCAT is over an internal, 3-wire, RS-232C link. The MicroCAT's aged and pressure-protected thermistor has a long history of exceptional accuracy and stability (typical drift is less than 0.002° per year). Electrical isolation of the conductivity electronics eliminates any possibility of ground-loop noise.

Specifications

  Temperature
(°C)
Conductivity (S m -1 ) Optional Pressure
Measurement Range -5 to +35 0 to 7 (0 to 70 mS cm -1 ) 0 to full scale range: 20 / 100 / 350 / 1000 / 2000 / 3500 / 7000 metres
Initial accuracy 0.002 0.0003 0.1% of full scale range
Typical Stability 0.0002 per month 0.0003 per month 0.05% of full scale range per year
Resolution 0.0001 0.00001 0.002% of full scale range
Sensor Calibration +1 to +32 0 to 6; physical calibration over range 2.6 to 6 S m -1 , plus zero conductivity (air) Ambient pressure to full scale range in 5 steps
Memory 8 Mbyte non-volatile FLASH memory
Data Storage Converted temperature and conductivity: 6 bytes per sample (3 bytes each)
Time: 4 bytes per sample
Pressure (optional): 5 bytes per sample
Real-Time Clock 32,768 Hz TCXO accurate to ±1 minutes year -1
Standard Internal Batteries Nominal 10.6 Ampere-hour pack consisting of 12 AA lithium batteries. Provides sufficient capacity for more than 630,000 samples for a typical sampling scheme
Housing Titanium pressure case rated at 7000 metres
Weight (without pressure) In water: 2.3 kg
In air: 3.8 kg

Further information can be found via the following link: SBE 37-SM MicroCAT Datasheet

BODC Processing

Data were received in ASCII format files. The series were transferred to BODC's in-house format. The following table shows how the variables within the file were mapped to the appropriate BODC parameter codes.

Original parameter name Original Units BODC Parameter Code BODC Units Comments
Pressure decibars PREXPR01 decibars Not recorded at all moorings
Temperature °C TEMPPR01 °C  
Salinity p.p.t. PSALPR01 Dimensionless Not recorded at all moorings

Following transfer to QXF, the data were visually screened. Any data considered as suspect were flagged accordingly. The originator's quality control flags were retained during transfer.

Originator's Data Processing

Marine Scotland applied the standard manufacturers' calibrations to all data and produced ASCII files for submission to BODC. Data files (.hmo) were named according to the mooring code and the instrument number. The file contained pressure and/or temperature. Salinity data, where available, were contained in a file appended 's'. Header metadata were collated in an additional file (.frm).


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2010-05-21
End Date (yyyy-mm-dd) 2010-11-29
Organization Undertaking ActivityMarine Scotland Aberdeen Marine Laboratory
Country of OrganizationUnited Kingdom
Originator's Data Activity Identifier783
Platform Categorysubsurface mooring

FRS current meter mooring (783) from East Shetland 2

A current meter mooring was deployed by Marine Scotland, Aberdeen Marine Laboratory at site East Shetland 2 (60° 10.00'N 00° 09.97'W) on 21/05/2010 during the FRV Scotia cruise 0610S. The mooring was recovered on 29/11/2010 by the FV Unity cruise 1810H. The station had a nominal water depth of 124m.

The mooring consisted of the following instruments:

Instrument type Series Number Serial Number Deployment start Deployment end Instrument depth (m) No. Readings/Hour Comments
Aanderaa Seaguard RCM IW 7831 69 21/05/2010 29/11/2010 42 6 Salinity degradation due to fouling
Aanderaa Seaguard RCM IW 7832 70 21/05/2010 29/11/2010 115 6 Salinity degradation due to fouling
Sea-Bird SBE37-SM 7833 1684 21/05/2010 29/11/2010 113 30 Salinity degradation due to fouling

Other Series linked to this Data Activity - 1043673 1043685

Cruise

Cruise Name 0610S
Departure Date 2010-05-14
Arrival Date 2010-06-01
Principal Scientist(s)George Slesser (Marine Scotland Aberdeen Marine Laboratory)
Ship FRV Scotia

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