Metadata Report for BODC Series Reference Number 2223820
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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Problem Reports
No Problem Report Found in the Database
BAS Long Term Monitoring and Survey RRS James Clark Ross JR15004 surface hydrography quality control report
Throughout the cruise period the flow pump was switched off several times. All surface hydrography channels were flagged M for the periods where the flow was < 0.4 l min-1. These periods were:
- 19/02/2016 14:00:00 hours to 22/01/2016 15:14:00 hours
- 23/01/2016 08:31:00 hours to 23/01/2016 11:17:00 hours
- 24/01/2016 13:31:00 hours to 26/01/2016 10:32:00 hours
- 13/02/2016 12:14:00 hours to 13/02/2016 23:15:00 hours
- 15/02/2016 14:05:00 hours to 16/02/2016 17:53:00 hours
- 20/02/2016 02:02:00 hours to 20/02/2016 17:27:00 hours
- 21/02/2016 12:03:00 hours to 21/02/2016 18:00:00 hours
M flags were also applied to INFLTF01 where values were negative.
Data Access Policy
Open 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.
If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:
"Contains public sector information licensed under the Open Government Licence v1.0."
Narrative Documents
BAS Long Term Monitoring and Survey RRS James Clark Ross JR15004 Underway Cruise Document
Cruise details
| Dates | 2016-01-19 — 2016-02-21 |
|---|---|
| Principal Scientific Officer | Jonathan Watkins, British Antarctic Survey, Cambridge |
| Data supplied by | Polar Data Centre, Cambridge |
JR15004 consisted of a series of science modules operating at different spatial scales in the South Orkney Island region of the Scotia Sea. The main objectives for the cruise were:
- to characterise physical and biological environment on a latitudinal transect upstream of the South Orkney region
- to characterise the physical and biological environment of the northern shelf and shelf break region of the South Orkney Islands.
- to determine the fine scale distribution of krill across the most heavily fished area of the north coast of the South Orkney Islands
- to understand physical-biological drivers at the small scale of the Western Canyon
- to map distribution and biomass of krill and predators in large krill aggregation detected on shelf break of Coronation Island
- to understand physical-biological drivers of behaviour in krill aggregations
- to calibrate EK60 and EK80 systems on JCR. WBAT stand-alone system for moorings and CTD. RDI ship-mounted ADCP
The research activities link with concurrent observations from commercial fishing vessels operating in the region, together with a regional 5 day krill survey undertaken by Norwegian fishing vessel FV Saga Sea. The ship-based activities are also tightly linked to predator tracking studies being undertaken from key penguin and fur seal colonies in the South Orkney region.
Upon leaving port, the ship sailed towards Scotia Bay, then the northern shelf of Coronation Island, the Inaccessible Canyon, Signy and from there transited back to Mare Harbour, Falklands.
Data were not processed by the originator.
SeaBird Digital Oceanographic Thermometer SBE38
The SBE38 is an ultra-stable thermistor that can be integrated as a remote temperature sensor with an SBE21 Thermosalinograph or an SBE 45 Micro TSG, or as a secondary temperature sensor with an SBE 16 plus, 16plus-IM, 16plus V2, 16plus-IM V2 or 19plus V2 SEACAT CTD.
Temperature is determined by applying an AC excitation to reference resistances and an ultra-stable aged thermistor. The reference resistor is a hermetically sealed VISHAY. AC excitation and ratiometric comparison using a common processing channel removes measurement errors due to parasitic thermocouples, offset voltages, leakage currents and gain errors.
The SBE38 can operate in polled sampling, where it takes one sample and transmits the data, or in continuous sampling.
Specifications
| Depth rating | up to 10500 m |
| Temperature range | -5 to 35°C |
| Initial accuracy | ± 0.001°C |
| Resolution | 0.00025°C |
| Stability | 0.001°C in 6 months |
| Response time | 500 ms |
| Self-heating error | < 200 µK |
Further details can be found in the manufacturer's specification sheet.
Turner Designs 10AU Field Fluorometer
The Turner Designs 10AU is designed for continuous-flow monitoring or discrete sample analyses of fluorescent species. A variety of optical kits with appropriate filters and lamps are available for a wide range of applications. Individual filters and lamps are also available for customised applications.
Standard optical kits include those for chlorophyll-a (extracted and/or in vivo), phycocyanin, phycoerythrin, CDOM, ammonium, rhodamine and fluorescein dye tracing, crude oil, refined oil, histamine and optical brighteners.
The instrument's light source is a 4 watt lamp and the detector is a photomultiplier tube with a standard detection range of 300-650 nm. A red-sensitive version with a detetion range of 185-970 nm is also available.
Specifications
| Operating temperature | 0 to 55°C |
| Detector | PhotoMultiplier Tube 300 to 650 nm (standard) 185 to 870 nm (Red) |
| Detection Limits: Extracted Chlorophyll-a Rhodamine WT Dye Fluorescein Dye | 0.025 µg L-1 0.01 ppb (in potable water) 0.01 ppb (in potable water) |
| Linear range: Extracted Chlorophyll-a Rhodamine WT Dye Fluorescein Dye | 0 to 250µg L-1 0 to 250 ppb 0 to 250 ppb |
Further details can be found in the manufacturer's specification sheet.
WETLabs C-Star transmissometer
This instrument is designed to measure beam transmittance by submersion or with an optional flow tube for pumped applications. It can be used in profiles, moorings or as part of an underway system.
Two models are available, a 25 cm pathlength, which can be built in aluminum or co-polymer, and a 10 cm pathlength with a plastic housing. Both have an analog output, but a digital model is also available.
This instrument has been updated to provide a high resolution RS232 data output, while maintaining the same design and characteristics.
Specifications
| Pathlength | 10 or 25 cm |
| Wavelength | 370, 470, 530 or 660 nm |
| Bandwidth | ~ 20 nm for wavelengths of 470, 530 and 660 nm ~ 10 to 12 nm for a wavelength of 370 nm |
| Temperature error | 0.02 % full scale °C-1 |
| Temperature range | 0 to 30°C |
| Rated depth | 600 m (plastic housing) 6000 m (aluminum housing) |
Further details are available in the manufacturer's specification sheet or user guide.
BAS Long Term Monitoring and Survey RRS James Clark Ross JR15004 Underway Surface Hydrography Instrumentation
Sea surface temperature is measured by two probes mounted near the hull, close to the entry point for the uncontaminated water supply and by a thermosalinograph located in the ship's prep room. All other parameters are measured by instruments also located on the ship's prep room.
| Sensor | Manufacturer | Serial number | Main role |
| SBE45 CTD | SeaBird Electronics | 4524698-0016 | Surface hydrography |
| 10-AU Fluorometer | Turner Designs | 1100243 | Chlorophyll fluorescence |
| Flow meter | Litre Meter | 811950 | Flow rate |
| SBE38 | SeaBird Electronics | primary- 0601 andsecondary- 0599 | Temperature sensor |
| C-Star | WetLabs | 396 | Transmissometer |
Litre Meter flow meter
A flow meter used to monitor water flow rates for pumped systems such as ships' continuous seawater supplies.
SeaBird MicroTSG Thermosalinograph SBE 45
The SBE45 MicroTSG is an externally powered instrument designed for shipboard measurement of temperature and conductivity of pumped near-surface water samples. The instrument can also compute salinity and sound velocity internally.
The MicroTSG comprises a platinum-electrode glass conductivity cell and a stable, pressure-protected thermistor temperature sensor. It also contains an RS-232 port for appending the output of a remote temperature sensor, allowing for direct measurement of sea surface temperature.
The instrument can operate in Polled, Autonomous and Serial Line Sync sampling modes:
- Polled sampling: the instrument takes one sample on command
- Autonomous sampling: the instrument samples at preprogrammed intervals and does not enter quiescence (sleep) state between samples
- Serial Line Sync: a pulse on the serial line causes the instrument to wake up, sample and re-enter quiescent state automatically
Specifications
| Conductivity | Temperature | Salinity | |
|---|---|---|---|
| Range | 0 to 7 Sm-1 | -5 to 35°C | |
| Initial accuracy | 0.0003 Sm-1 | 0.002°C | 0.005 (typical) |
| Resolution | 0.00001 Sm-1 | 0.0001°C | 0.0002 (typical) |
| Typical stability (per month) | 0.0003 Sm-1 | 0.0002°C | 0.003 (typical) |
Further details can be found in the manufacturer's specification sheet.
BAS Long Term Monitoring and Survey RRS James Clark Ross JR15004 Underway Surface Hydrography Document
Content of data series
| Parameter | Units | Parameter code | Comments |
|---|---|---|---|
| Latitude | Degrees (+ve N) | ALATGP01 | |
| Longitude | Degrees (+ve E) | ALONGP01 | |
| Salinity | Dimensioneless | PSALSU01 | |
| Conductivity | m s-1 | CNDCSG01 | |
| Temperature | °C | TMESSG01 | Sea surface, remote |
| Temperature | °C | TEMPHU01 | Sea surface, hull sensor |
| Sound velocity | m s-1 | SVELSG01 | |
| Chlorophyll | µg l-1 | CPHLUMTF | |
| Transmittance | % | POPTDR01 | |
| Flow Rate | l min-1 | INFLTF01 |
Data Processing Procedures
Originator's Data Processing
Data processing was not done by the originator.
All sea surface hydrography measurements were performed by a number of instruments connected to the ship's flow through system located at the ship's preparation lab.
Files delivered to BODC
| Filename | Content description | Format | Interval | Start date/time (UTC) | End date/time (UTC) | Comments |
| oceanlogger | Surface hydrography | ascii | 5s | 13/01/2016 15:33:04 | 22/02/2016 22:34:14 | Raw data |
BODC Data Processing
The file mentioned above was selected for data banking as it contains the best version of surface hydrography data. Data were banked at BODC following standard data banking procedures, including reduction through averaging, checking surface hydrography channels for improbable values and screening the data for anomalous values. The originator's variables were mapped to appropriate BODC parameter codes as follows:
oceanlogger
| Originator's variable | Originator's units | BODC Code | BODC Units | Comments |
| tstemp | degrees C | TMESSG01 | degrees C | Remote sensor |
| conductivity | s m-1 | CNDCSG01 | s m-1 | |
| salinity | - | PSALSU01 | dimensionless | |
| sound_velocity | m s-1 | SVELSG01 | m s-1 | |
| chlorophyll | µg l-1 | CPHLUMTF | mg m-3 | Equivalent units |
| FlowRate | l min-1 | INFLTF01 | l min-1 | |
| sstemp | degrees C | TEMPHU01 | degrees C | hull sensor |
| sstemp2 | degrees C | TEMPHU02 | degrees C | hull sensor |
| trans | 0<Tr<1 | POPTDR01 | % | conversion by *100 |
Surface hydrography data were screened using Edserplo and N flags applied to absent data. M flags were applied to all instances where the flow pump was switched off.
Project Information
BAS Long Term Monitoring and Survey
Introduction
The Long Term Monitoring and Survey project (LTMS) has been running since the British Antarctic Survey (BAS) was created. This project is one of the BAS core projects, with several groups of scientists collecting various types of data e.g biological, geological, atmospheric, among others.
Data collection is achievable through a wide scope of instruments and platforms, e.g. the Antarctic research stations, autonomous instrument platforms deployed on or from BAS research ships, BAS aircrafts, satellite remote sensing and others.
Scientific Objectives
This project was implemented in order to measure change and variability in the Earth system. Its long term duration allows for the monitoring of processes that could be missed in shorter term studies and experiments. The data collected is also used to check and improve the reliability of models used to stimulate and predict the behavior of the Earth system.
The main objectives are:
- Topographic survey
- Geosciences survey
- Biological survey and monitoring
- Atmospheric and oceanographic monitoring
Data Availability
The data sets obtained through this project are available to the academic community.
Data Activity or Cruise Information
Cruise
| Cruise Name | JR15004 |
| Departure Date | 2016-01-19 |
| Arrival Date | 2016-02-21 |
| Principal Scientist(s) | Jonathan L Watkins (British Antarctic Survey) |
| Ship | RRS James Clark Ross |
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 |
