Metadata Report for BODC Series Reference Number 1170696
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
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Parameters |
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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
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
PO328 Moored MicroCat Sensors Processing undertaken by BODC
Data were received by BODC in ASCII files for each sensor deployed. The series were reformatted to internal BODC format using established procedures. The following table details mapping of variables to BODC parameter codes
Originator' Variable | Units | BODC Parameter Code | Definition of Parameter Code | Units | Comments |
---|---|---|---|---|---|
Temperature | °C | TEMPPR01 | Temperature of the water body. | °C | |
Conductivity | S m-1 | CNDCPR01 | Electrical conductivity of the water body by in-situ conductivity cell | S m-1 | |
Pressure | Decibars | PREXPR01 | Pressure (measured variable) exerted by the water body by semi-fixed in-situ pressure sensor and corrected to read zero at sea level | Decibars | Converted so that depths below the sea surface are positive |
Salinity | PSALPR01 | Practical salinity of the water body by conductivity cell and computation using UNESCO 1983 algorithm | Re-derived by BODC |
BODC Quality Control
The reformatted data were visualised using BODC in-house software. Suspect data were marked by adding an appropriate quality control flag, and missing data marked by both setting the data to an appropriate absent data value and setting the quality control flag.
PO328 Moored MicroCat sensors originators processing document
Data processing
Prior to deployment, Proudman Oceanographic Laboratory (POL) set up the Sea-Bird MicroCATs to sample at an interval of one minute. On recovery, POL downloaded data from the instrument logger and applied factory calibrations to the temperature, conductivity and pressure channels using the standard SeaBird software. The loggers were also set up to output salinity. The data were then reformatted by POL to a standard ASCII format.
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2005-09-08 |
End Date (yyyy-mm-dd) | 2005-09-21 |
Organization Undertaking Activity | Proudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool) |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | PO328_East |
Platform Category | subsurface mooring |
PO328 East temperature logger mooring
Deployment and recovery
The temperature logger array was deployed and recovered from FS Poseidon cruise PO328.
Deployment | Recovery | |
---|---|---|
Time (UTC) | 2005/09/08 08:00 - 08:27 on | 2005/09/21 07:01 |
Nominal water depth | 597 m | 599 m |
Position | 60° 14.41'N 04° 37.46'W | 60° 14.58'N 04° 37.05'W |
The mooring was deployed from the afterdeck using the A-frame. The sub-surface buoyancy is deployed first followed by the mooring wire, instruments being attached at pre-marked intervals on the wire. The MORS release is attached to the bottom end of the wire followed by the anchor clump which is cut free when the ship is on station. The ascent rate of the mooring was estimated as 100 m min-1.
Recovery was over the port side with the strayline attached to the sub-surface buoy being grappled first and the buoy winched onboard. This was then unshackled and the mooring wire attached to the winch. As the wire was wound in the Minilogs were removed one by one until finally the Oceano release was brought onboard.
Mooring setup
The moorings consisted of a 50 m mooring wire attached to a 500 kg anchor clump via an Oceano transponding release. Buoyancy was provided by a syntactic barrel buoy. Each had a 15 m stray line and pickup float to aid recovery. Vemco Minilog temperature recorders were attached using cable ties and PVC tape at 4 m intervals along the mooring wire. In addition a Seabird MicroCAT (temperature, conductivity and pressure) recorder was deployed at the deepest point; nominally 4 m above the bed. The Minilog sampling interval, either two minutes or four minutes, was determined by the memory capacity of the individual loggers.
Rig description
Instrument | Serial number | Nominal height above the bed (m) | Logging interval (minutes) | Time (UTC) of last data ensemble | Calibration date | Owner |
---|---|---|---|---|---|---|
Vemco Minilog | 2187 | 53 | 4 | 2005/09/22 17:12 UTC (logger turned off at 17:14:19) | 2004/08 | POL |
Vemco Minilog | 2106 | 49 | 2 | 2005/09/22 17:38 (logger turned off at 17:39:39) | 2005/06 | POL |
Vemco Minilog | 7333 | 45 | 2 | 2005/09/22 18:02 (logger turned off at 18:03:29) | 2005/12 | POL |
Vemco Minilog | 5230 | 41 | 4 | 2005/09/22 17:02 (logger turned off at 17:33:39) | 2005/12 | POL |
Vemco Minilog | 2108 | 37 | 2 | 2005/09/22 18:30 (logger turned off at 18:31:39) | 2005/06 | POL |
Vemco Minilog | 2112 | 33 | 2 | 2005/09/22 18:12 (logger turned off at 18:13:39) | 2005/06 | POL |
Vemco Minilog | 2193 | 29 | 4 | 19:20 on 22/09/2005 (logger turned off at 19:23:39) | 08/2004 | POL |
Vemco Minilog | 2424 | 25 | 2 | 2005/09/22 17:28 (logger turned off at 17:29:39) | 2001/07 | POL |
Vemco Minilog | 4484 | 21 | 2 | No data* | 2005/06 | POL |
Vemco Minilog | 8961 | 17 | 4 | 2005/09/22 17:52 (logger turned off at 17:55:39) | 2005/12 | POL |
Vemco Minilog | 2113 | 13 | 2 | 2005/09/22 15:32 (logger turned off at 15:33:39) | 2005/06 | POL |
Vemco Minilog | 4483 | 9 | 2 | 2005/09/22 19:02 (logger turned off at 19:02:59) | 2005/06 | POL |
Vemco Minilog | 8947 | 5 | 4 | 2005/09/22 17:20 (logger turned off at 17:21:39) | 2005/12 | POL |
Seabird MicroCAT | 3273 | 4 | 1 | 2005/09/21 16:14 | UKORS | |
Oceano release type RT661 | 183 |
*The originator was unable to download the data from this logger.
POL - Proudman Oceanographic Laboratory, Liverpool
UKORS - UK Ocean Research Services
Related Data Activity activities are detailed in Appendix 1
Cruise
Cruise Name | PO328 |
Departure Date | 2005-09-06 |
Arrival Date | 2005-09-25 |
Principal Scientist(s) | John Huthnance (Proudman Oceanographic Laboratory) |
Ship | FS Poseidon |
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 |
Appendix 1: PO328_East
Related series for this Data Activity are presented in the table below. Further information can be found by following the appropriate links.
If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.
Series Identifier | Data Category | Start date/time | Start position | Cruise |
---|---|---|---|---|
1170278 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170291 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170309 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170310 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170322 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170334 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170346 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170358 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170371 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170383 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170395 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |
1170402 | Hydrography time series at depth | 2005-09-07 06:00:00 | 60.2402 N, 4.6243 W | FS Poseidon PO328 |