Metadata Report for BODC Series Reference Number 1217005
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 Identifiers |
|||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||
Time Co-ordinates(UT) |
|||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||
Spatial Co-ordinates | |||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||
Parameters |
|||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||
|
Problem Reports
No Problem Report Found in the Database
Data Quality Report
There is clear evidence of mooring 'knockdown' between 23rd November and 29th November 2008 of 20 m for 6 days. This has mostly affected the shallower bins 25-37. The erroneous value -3276.800049 was recorded during this time in the shallower bins, these have been flagged null and set to the absent data value.
Data Quality Report
There is some evidence of mooring 'knockdown' between 23rd November and 29th November 2008.
The instrument depths were deeper than the nominal depths stated in the cruise report on account of the mooring being deployed in deeper water than anticipated.
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-SMP MicroCAT
The SBE 37-SMP MicroCAT is a high accuracy conductivity and temperature recorder (pressure optional) with Serial interface, internal battery, non-volatile FLASH Memory and integral Pump. The Integral Pump runs for 1 second each time the MicroCAT samples, improving the conductivity response and giving improved anti-foul protection.
Designed for moorings and other long-duration, fixed-site deployments, MicroCATs have non-corroding titanium housings rated for operation to 7000 meters 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°C per year). Electrical isolation of the conductivity electronics eliminates any possibility of ground-loop noise.
Specifications
Temperature (°C) | Conductivity (S/m) | Optional Pressure | |
---|---|---|---|
Measurement Range | -5 to +35 | 0 to 7 (0 to 70 mS/cm) | 0 to full scale range: 20 / 100 / 350 / 600 / 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 |
Data Storage | Temperature and conductivity: 6 bytes per sample Time: 4 bytes per sample Pressure (optional): 5 bytes per sample | ||
Clock stability | 5 seconds per month | ||
Standard Internal Batteries | Nominal 10.6 Ampere-hour pack consisting of twelve AA lithium batteries. Provides sufficient capacity for more than 100,000 samples for a typical sampling scheme | ||
Housing | Titanium pressure case rated at 7000 metres | ||
Weight (without pressure) | In water: 3kg In air: 5kg |
Further information can be found via the following link: Sea-Bird SBE 37-SMP MicroCAT Datasheet
BODC Processing
The data were received in four Matlab format files, one for each instrument. The data were converted into BODC internal format following BODC's standard procedures. The following table shows how the variables within the Matlab file were mapped to appropriate BODC parameter codes. In addition to these, time, datenum and rtc accompanied the data but were not transferred.
Originator's Parameter Name | Units | Description | BODC Parameter Code | Units | Comments |
---|---|---|---|---|---|
temperature | °C | Temperature of the water body | TEMPPR01 | °C | - |
conductivity | S m-1 | Electrical conductivity of the water body | CNDCZZ01 | S m-1 | - |
pressure | dbar | Pressure (measured variable) exerted by the water | PPSDZZ01 | dbar | - |
salinity | Dimensionless | Practical salinity of the water body by computation using UNESCO 1983 algorithm | PSALZZXX | Dimensionless | - |
All reformatted data were visualised using the in-house Edserplo software. Improbable and missing data were marked by adding an appropriate quality control flag. Data were flagged at the beginning and end of the mooring to cover the deployment and recovery.
References
Fofonoff, NP and Millard, RC. 1983. Algorithms for computations of fundamental properties of seawater. UNESCO Technical Papers in Marine Science, 44, p.53.
Originator's Processing
Data from four Sea-Bird SBE 37-SMP MicroCAT C-T sensors were collected on two moorings deployed during the SOFINE cruise JC029. On recovery it was found that many of the instruments had screws loose or missing, 2 screws missing from the 3250, 3 screw loose on the 3276, 1 screw loose on the 3218 and 3 screws missing from 3481. The frames of all Sea-Bird SBE 37-SMP MicroCAT C-T sensors looked stretched. During the cruise the data were downloaded and processed into physical units. The downloaded data were inspected for completeness and data quality. As part of this process, data from the instrument were stored in the form of a Matlab structure.
Project Information
Southern Ocean FINEStructure (SOFINE) project document
The Southern Ocean FINEStructure (SOFINE) project was a UK field programme aimed at studying the frictional processes that slow down the Antarctic Circumpolar Current (ACC) and influence the meridional exchange of water masses in the Southern Ocean.
The study investigated the role of sea floor topography in slowing the ACC and driving meridional flow across the Southern Ocean, and the manner in which mesoscale and small scale oceanic phenomena modified water mass properties and affected their movement across the ACC. Specifically, SOFINE set out to:
- Determine the relative importance of oceanic processes associated with large scale (hundreds to thousands of kilometres) and small scale (a few kilometres) sea floor topography in the context of ACC flow rates and water mass exchange.
- Identify the oceanic processes controlling the rate at which water masses are transformed and fluxed across the ACC.
The SOFINE experiment focused on a major meander of the ACC around the northern Kerguelen Plateau in the Indian Ocean. Theories and models of Southern Ocean circulation indicated that this region experienced intensified 'friction' and cross-ACC flow. Fieldwork was undertaken over a 52 day period in November and December 2008, and included hydrographic observations, microcstructure and turbulence measurements, detailed bathymetric surveys and several deployments of floats, drifters and moorings.
SOFINE was funded by the UK Natural Environment Research Council and involved the collaboration of a number of international institutions: the National Oceanography Centre (UK), the University of East Anglia (UK), British Antarctic Survey (UK), Woods Hole Oceanographic Institution (US), the Commonwealth Scientific and Industrial Research Organisation (Australia), the University of Tasmania (Australia) and the Leibniz Institute of Marine Sciences (IFM-GEOMAR) at the University of Kiel (Germany).
For more information please see the official project website at SOFINE
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2008-11-11 |
End Date (yyyy-mm-dd) | 2008-12-06 |
Organization Undertaking Activity | National Oceanography Centre, Southampton |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | MOOR2 |
Platform Category | subsurface mooring |
SOFINE JC029 Short-term Moored Instrument Northern Mooring 2
Deployed (UT) | 2008-11-11 09:59:00 |
---|---|
Latitude (+ve N) | -46.52205 |
Longitude (+ve E) | 71.89768 |
Recovered (UT) | 2008-12-06 10:40:00 |
Prior to the mooring operations, a 12 hour swath survey was completed of a ridge that extended northward from the Kerguelen Plateau between -46° 30' S to -47° S and 71° 45' E to 72° E. Locations of the mooring sites were then determined from the swath data. Three short-term moorings were deployed located within approximately 1 km of each other. All moorings were deployed using a National Oceanography Centre Southampton (NOCS) double barrel winch (electro-hydraulic) and reeling winch system which was load tested prior to commencement of operations. The moorings were deployed 'top first - anchor last', allowing the buoyancy to stream away from the vessel during deployment. The ship's speed varied between 0.3 and 1.2 knots during the mooring deployment. The anchors for the three UK moorings consisted of a 550 kg mushroom anchor and 2200 kg of eight inch chain. This was designed to be deployed such that as it reached the seabed the mushroom anchor would land first, and the chain would land on the seabed to provide as much scope and drag as possible due to the anticipated high energies.
The mooring location was determined from three independent ranging locations (triangulation) to the acoustic release. The ship was positioned approximately an ocean depth horizontally away from the likely location of the mooring. A transducer was deployed over the side of the ship and the slant range (distance) to the mooring was obtained. The calculated horizontal distance provided an estimate of the radius from the ship location within which the mooring was located. The cross-over of the three range circles ("cocked hat") provided an estimate of the location of the mooring.
Instruments deployed on the rig
Water column depth (m) | Instruments | Serial numbers |
---|---|---|
94 | Aanderaa RCM 7 Recording Current Meter | 9069 |
196 | Aanderaa Seaguard Recording Current Meter Sea-Bird SBE 37-SMP MicroCAT C-T Sensor | 69 3276 |
398 | Aanderaa RCM 8 Recording Current Meter | 9440 |
600 | Aanderaa Seaguard Recording Current Meter Sea-Bird SBE 37-SMP MicroCAT C-T Sensor | 70 3481 |
802 | Aanderaa RCM 8 Recording Current Meter | 11215 |
903 | Teledyne RDI Workhorse Long-Ranger 75 kHz ADCP | 10583 |
910 | Aanderaa RCM 11 Recording Current Meter RBR XR-420 CTD Marine | 425 17025 |
921 | McLane Moored Profiler | 11794-03 |
1869 | Nortek Aquadopp current meter Sea-Bird SBE 37-SI MicroCAT C-T Sensor | 1404 3145 |
Related Data Activity activities are detailed in Appendix 1
Cruise
Cruise Name | JC029 |
Departure Date | 2008-11-01 |
Arrival Date | 2008-12-22 |
Principal Scientist(s) | Alberto C Naveira Garabato (University of Southampton School of Ocean and Earth Science) |
Ship | RRS James Cook |
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: MOOR2
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 |
---|---|---|---|---|
1208561 | Currents -subsurface Eulerian | 2008-11-12 10:00:00 | 46.52205 S, 71.89768 E | RRS James Cook JC029 |
1209957 | Hydrography time series at depth | 2008-11-12 10:00:00 | 46.52205 S, 71.89768 E | RRS James Cook JC029 |
1216991 | Hydrography time series at depth | 2008-11-12 10:00:00 | 46.52205 S, 71.89768 E | RRS James Cook JC029 |
1208524 | Currents -subsurface Eulerian | 2008-11-13 07:15:00 | 46.52205 S, 71.89768 E | RRS James Cook JC029 |