Metadata Report for BODC Series Reference Number 1108941
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
DISCOVERY 2010 James Clark Ross Cruise JR20061024 (JR161) Surface Hydrography Data Quality Report
Quality control report
T flags were assigned to the interpolated values created with NAVINT, the corresponding cycles are: 1283 to 1289 and 31919 to 31944.
CPHLUMTF data were flagged due to a spike on cycle 1024. Several cycles at the beginning of the cruise (cycles 1 to 814) were also assigned an M flag, as they exhibited a constant value (0.24 mg m-3) for a prolonged period (about 13 hours long).
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
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.
DISCOVERY 2010 James Clark Ross Cruise JR20061024 (JR161) Surface Hydrography Instrumentation Report
Instrumentation
The instruments used to obtain hydrographic measurements are listed below:
| Manufacturer | Model | Serial number | Last calibration date | Function |
| SeaBird Electronics | SBE45 CTD | 4524698-0018 | 2004-03-05 | Surface hydrography |
| Turner Designs | 10-AU Fluorometer | 6465RTX | - | Chlorophyll fluorescence |
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.
DISCOVERY 2010 James Clark Ross Cruise JR20061024 (JR161) Surface Hydrography Data Processing Report
Originator's Data Processing
The thermosalinograph and fluorometer connected to the ship's non-toxic seawater supply collected surface hydrographic data that were merged into one single file with data from the other systems. The data were fully processed and calibration procedures were performed on board.
Several gaps are present in the data set and they relate to periods when the oceanlogger system did not function due to ice blockage. During the transfer procedures these gaps were assigned an absent value flag (N).
BODC Data Processing
One file was received at BODC, containing fully processed data that were merged from the navigation, meteorology and oceanlogger systems. The data were sent with a 1 minute resolution. The start date was 24 October 2006 00:00 hours and end date 28 November 2006 23:58 hours.
The file contained 24 channels, and although all are available on request, not all were loaded onto BODC's database, as they uncalibrated data or obtained from secondary sensors. Originator's variables and units are: time (seconds), time_jday (days), air_temperature1 (°c90), humidity1 (%), par1 (µmol m-2 s -1), tir1 (W m -1), air_temperature2 (°c90), humidity2 (%), par2 (µmol m -2 s -1), tir2 (W m -1), pressure1 (hPa), pressure2 (hPa), saltemp (°c90), cond (S m -1), psal (pss-78), sound_vel (m s -1), fluor (µg l -1), fstemp (°c90), flow (l min -1), sst (°c90), sst_uncal (°c90), psal_uncal (pss-78), latitude (degrees), longitude (degrees).
Parameter codes defined in BODC's parameter dictionary were assigned to originator's variables. There was no need to apply a conversion as original units were equivalent to the ones defined in BODC codes. Data were loaded into BODC's database using established data banking procedures.
| Originators' Parameter Name | Units | BODC parameter code | Units |
|---|---|---|---|
| latitude | degrees | ALATGP01 | degrees |
| longitude | degrees | ALONGP01 | degrees |
| cond | S m-1 | CNDCSG01 | S m-1 |
| psal | pss-78 | PSALSG01 | - |
| sound_vel | m s-1 | SVELSG01 | m s-1 |
| fluor | µg l-1 | CPHLUMTF | mg m-3 |
| flow | l min-1 | INFLTF01 | l min-1 |
| sst | °c90 | TMESSG01 | °C |
Navigation was checked using the NAVCHECK routine and speed fails were identified. The cycles were identified and flagged with the absent value flag (N). NAVINT was then used to interpolate data for these gaps and later confirmed that they were successfully applied. No other flags were applied to these channels.
During the transfer, several gaps were identified and an absent value flag (N) was assigned. The entire data set was screened using Edserplo and a M flags were applied to a spike in Chlorophyll and to a period of constant values at the start of the cruise. No other flags were applied.
Calibration
The data were fully processed and calibrated by the originator, no details of the calibrations are available. BODC did not apply any calibration procedures to this data set.
Project Information
DISCOVERY 2010
DISCOVERY 2010 will investigate and describe the response of an ocean ecosystem to climate variability, climate change and commercial exploitation. The programme builds on past studies by BAS on the detailed nature of the South Georgia marine ecosystem and its links with the large-scale physical and biological behaviour of the Southern Ocean.
The aim is to identify, quantify and model key interactions and processes on scales that range from microscopic life forms to higher predators (penguins, albatrosses, seals and whales), and from the local to the circumpolar.
Objectives
Assess the links between the status of local marine food webs and variability and change in the Southern Ocean. Develop a linked set of ecosystem models applying relevant marine physics and biology over scales from the local to that of the entire Southern Ocean.
Relevance to Global Science
Ocean ecosystems play a crucial role in maintaining biodiversity, in depositing carbon into the deep ocean, and as a source of protein for humans. However, fishing and climate change are having significant and often detrimental effects. To predict the future state of ocean ecosystems we must develop computer models capable of simulating biological and physical processes on a range of scales from the local to an entire ocean. Developing such predictive models is crucial to the sustainable management of world fisheries and requires integrated analyses of the way whole ecosystems work. DISCOVERY 2010 aims to take this work forward and at the same time help manage the South Georgia and South Sandwich Islands maritime zone. We will do this through providing information on the state of the ecosystem to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), the international body that manages sustainable fishing in the Southern Ocean.
Delivering the Results
DISCOVERY 2010 will undertake an integrated programme of shipboard and land-based field studies of the marine food web, combined with modelling. We will pay particular attention to critical phases in the life cycles of key species, and to examining interactive effects in food webs. Interacting biological and physical processes will be modelled across a range of spatial scales to significantly improve our representation of the ocean ecosystem, upon which sustainable management and the prediction of future climate change can be based. DISCOVERY 2010 will link to BIOFLAME, ACES, and COMPLEXITY, two international programmes, and to a collaborative programme with the University of East Anglia on the role of the Southern Ocean in the global carbon cycle.
Component Projects
- DISCOVERY-OEM: Ocean Ecosystems and Management
- DISCOVERY-FOOD-WEBS: Scotia Sea FOOD-WEBS
- DISCOVERY-FLEXICON: FLEXIbility and CONstraints in life histories
- DISCOVERY-CEMI: Circumpolar Ecosystems; Modelling and Integration
Data Activity or Cruise Information
Cruise
| Cruise Name | JR20061024 (JR156, JR161) |
| Departure Date | 2006-10-24 |
| Arrival Date | 2006-12-03 |
| Principal Scientist(s) | Rachael Shreeve (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 |
