Metadata Report for BODC Series Reference Number 1762273
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
AMT RRS James Cook Cruise JC079 AMT22 Meteorology Data Quality Document
The meteorology data have been through BODC quality control screening. Some intermittent flagging of data have been made. Overall the data for the cruise duration appear good.
Wind channels
The relative wind speed and direction channels show natural variation and fluctuation but there were no values or trends that stood out as unrealistic. There were 'steps' in the channel but this is related to the vessel coming on to or leaving station. No additional flags were added. The absolute wind speed and direction channels were screened and a few spikes flagged suspect.
Irradiance channels
The data in the channels did not require further flagging as it is unclear whether the variation is due to changing cloud cover etc.
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
AMT RRS James Cook Cruise JC079 AMT22 Meteorology Instrument Description Document
| Sensor | Serial number | Last calibration date | Deployment |
| Gill Wind sonic (Option 3) | 064537 | - | Starboard |
| Skye Instruments SKE510 | 28560 | 2011-07-05 | Starboard |
| Skye Instruments SKE510 | 28561 | 2011-07-11 | Port |
| Kipp and Zonen Ltd CMB6 | 973134 | 2011-07-15 | Starboard |
| Kipp and Zonen Ltd CMB6 | 973135 | 2011-07-15 | Port |
| Vaisala PTB100A | U1420016 | 2012-03-26 | Starboard |
| Vaisala HMP45A | E1055002 | 2012-07-02 | Starboard |
Gill Instruments Windsonic Anemometer
The Gill Windsonic is a 2-axis ultrasonic wind sensor that monitors wind speed and direction using four transducers. The time taken for an ultrasonic pulse to travel from the North to the South transducers is measured and compared with the time for a pulse to travel from South to North. Travel times between the East and West transducers are similarly compared. The wind speed and direction are calculated from the differences in the times of flight along each axis. This calculation is independent of environmental factors such as temperature.
Specifications
| Ultrasonic output rate | 0.25, 0.5, 1, 2 or 4 Hz |
| Operating Temperature | -35 to 70°C |
| Operating Humidity | < 5 to 100% RH |
| Anemometer start up time | < 5 s |
| Wind speed | |
| Range | 0 to 60 m s-1 |
| Accuracy | ± 2% at 2 m s-1 |
| Resolution | 0.01 m s-1 |
| Response time | 0.25 s |
| Threshold | 0.01 m s-1 |
| Wind direction | |
| Range | 0 to 359° |
| Accuracy | ± 3° at 12 m s-1 |
| Resolution | 1° |
| Response time | 0.25 s |
Further details can be found in the manufacturer's specification sheet.
Kipp and Zonen Pyranometer Model CM6B
The CM6B pyranometer is intended for routine global solar radiation measurement research on a level surface. The CM6B features a sixty-four thermocouple junction (series connected) sensing element. The sensing element is coated with a highly stable carbon based non-organic coating, which delivers excellent spectral absorption and long term stability characteristics. The sensing element is housed under two concentric fitting Schott K5 glass domes.
Specifications
| Dimensions (W x H) | 150.0 mm x 91.5 mm |
|---|---|
| Weight | 850 grams |
| Operating Temperature | -40°C to +80°C |
| Spectral Range | 305 - 2800 nm (50% points) |
| Sensitivity | 9 -15 µV/W/m2 |
| Impedance (nominal) | 70 - 100 ohm |
| Response Time (95%) | 30 sec |
| Non-linearity | < ± 1.2% (<1000 W/m2) |
| Temperature dependence of sensitivity | < ± 2% (-10 to +40°C) |
| Zero-offset due to temperature changes | < ± 4 W/m2 at 5 K/h temperature change |
Skye Instruments PAR Energy Sensor Model SKE 510
The SKE 510 is suitable for measuring photosynthetically active radiation (PAR) from natural or artificial light sources. The sensor is fully waterproof and guaranteed submersible to 4m depth, and indoor versions are also available.
The instrument uses a blue-enhanced planar diffused silicon detector to measure energy (in W m-2) over the 400-700 nm waveband. It has a cosine-corrected head and a square spectral response. The sensor can operate over a temperature range of -35 to 70 °C and a humidity range of 0-100% RH.
Specifications
| Sensitivity (current) | 1.5µA or 100 W m-2 |
|---|---|
| Sensitivity (voltage) | 1mV or 100 W m-2 |
| Working Range | 0-5000 W m-2 |
| Linearity error | 0.2% |
| Absolute calibration error | typ. less than 3% 5% max |
| Response time - voltage output | 10 ns |
| Cosine error | 3% |
| Azimuth error | less than 1% |
| Temperature co-efficient | ±0.1% per °C |
| Internal resistance - voltage output | c. 300 ohms |
| Longterm stability | ±2% |
| Material | Dupont 'Delrin' |
| Dimensions | 34 mm diameter 38mm height |
| Cable | 2 core screened 7 - 2 - 2C |
| Sensor Passband | 400 - 700 nm |
| Detector | Silicon photocell |
| Filters | Glass type and/or metal interference |
Vaisala Analog Barometers Models PTB100 (A), (B) and PTB101 (B), (C)
The PTB 100 series analog barometers are designed both for accurate barometric measurements at room temperature and for general environmental pressure monitoring over a wide temperature range. The long-term stability of the barometer minimizes the need for field adjustment in many applications.
Physical Specifications
| Size | 97 x 60 x 22 mm |
|---|---|
| Weight | 85g |
The barometers use the BAROCAP* silicon capacitive absolute pressure sensor developed by Vaisala for barometric pressure measurements. The BAROCAP* sensor combines the elasticity characteristics and mechanical stability of a single-crystal silicon with the proven capacitive detection principle.
Sensor Specifications
| Model Number | Pressure Range (mbar) | Temperature Range (°C) | Humidity Range | Total Accuracy | |
|---|---|---|---|---|---|
| PTB100A | 800 to 1060 | -40 to +60 | non-condensing | +20 °C | ± 0.3 mbar |
| 0 to +40 °C | ± 1.0 mbar | ||||
| -20 to +45 °C | ± 1.5 mbar | ||||
| -40 to +60 °C | ± 2.5 mbar | ||||
| PTB100B | 600 to 1060 | -40 to +60 | non-condensing | +20 °C | ± 0.5 mbar |
| 0 to +40 °C | ± 1.5 mbar | ||||
| -20 to +45 °C | ± 2.0 mbar | ||||
| -40 to +60 °C | ± 3.0 mbar | ||||
| PTB101B | 600 to 1060 | -40 to +60 | non-condensing | +20 °C | ± 0.5 mbar |
| 0 to +40 °C | ± 1.5 mbar | ||||
| -20 to +45 °C | ± 2.0 mbar | ||||
| -40 to +60 °C | ± 3.0 mbar | ||||
| PTB101C | 900 to 1100 | -40 to +60 | non-condensing | +20 °C | ± 0.3 mbar |
| 0 to +40 °C | ± 1.0 mbar | ||||
| -20 to +45 °C | ± 1.5 mbar | ||||
| -40 to +60 °C | ± 2.5 mbar | ||||
* BAROCAP is a registered trademark of Vaisala
Vaisala Temperature and Relative Humidity HMP Sensors
A family of sensors and instruments (sensors plus integral displays or loggers) for the measurement of air temperature and relative humidity. All are based on a probe containing a patent (HUMICAP) capacitive thin polymer film capacitanece humidity sensor and a Pt100 platinum resistance thermometer. The probes are available with a wide range of packaging, cabling and interface options all of which have designations of the form HMPnn or HMPnnn such as HMP45 and HMP230. Vaisala sensors are incorporated into weather stations and marketed by Campbell Scientific.
All versions operate at up to 100% humidity. Operating temperature ranges vary between models, allowing users to select the version best suited to their requirements.
Further details can be found in the manufacturer's specification sheets for the HMP 45 series, HMP 70 series and HMP 230 series.
AMT RRS James Cook Cruise JC079 AMT22 Meteorology Processing Procedures Document
Originator's Data Processing
Meteorology (HPMET)
During the cruise there was a dual logging system in place on the RRS James Cook. Data from the various instruments were logged to the RVS Level-C system file surfmet, and also as NetCDF (binary) through the Ifremer Techsas data logging system. The following instruments were logged during the cruise:
1) Gill Wind sonic (Option 3)
2) Skye Instruments SKE510 (port and starboard)
3) Kipp and Zonen Ltd CMB6 (port and starboard)
4) Vaisala PTB100A
5) Vaisala HMP45A
Processing was carried out using the RVS software suite only on the wind channels. The RVS processing routine PRO_WIND was run on the navigation data in the bestnav and the relative wind data in the surfmet files. This program was designed to remove the relative variables from the wind data logged by surfmet. By removing any fixed offsets in the system and removing the affect of ship motion the data in the pro_wind file is a true representation of wind data at the ship's position.
| Filename | Data type | Start Calendar Day | Start Time | Finish Calendar Day | Finish Time | Interval |
| pro_wind | RVS Level-C processed | 2012-10-10 | 08:00:00 | 2012-11-20 | 20:00:30 | 10 seconds |
| surfmet | RVS Level-C raw | 2012-10-10 | 07:59:58 | 2012-11-20 | 20:00:54 | 1 sec |
BODC Data Processing
The RVS Level-C files were chosen for transfer to the BODC underway file.
The surfmet data were transferred. A description of the channels present in the files, units, whether they were transferred, BODC parameter code and units, and if a unit conversion was applied during the transfer are detailed in the table below:
| surfmet | Channels | Description | Units | BODC Parameter Code | Units | Conversion Factor |
| trans | Raw transmissometer voltage | V | TVLTDR01 | V | *1 | |
| press | Atmospheric pressure at measurement height - no sea level correction | 1 hPa | CAPHTU01 | 1 mbar | *1 | |
| ppar | Raw port PAR sensor voltage | 10-2mV | DVLTRPSD | V | *10-5 | |
| spar | Raw starboard PAR sensor voltage | 10-2mV | DVLTRSSD | V | *10-5 | |
| speed | Relative wind speed | m s-1 | ERWSSS01 | m s-1 | *1 | |
| direct | Relative wind direction | Degrees | ERWDSS01 | Degrees | *1 | |
| airtemp | Air temperature | Degrees Celsius | CDTASS01 | Degrees Celsius | *1 | |
| humid | Air humidity | Percent | CRELSS01 | Percent | *1 | |
| ptir | Raw port TIR sensor voltage | 10-2mV | CVLTRP01 | V | *10-5 | |
| stir | Raw starboard TIR sensor voltage | 10-2mV | CVLTRS01 | V | *10-5 |
Wind channels
The BODC Matlab procedure 'wincor' was run using relative wind speed and direction, the ship's north-south and east-west velocities with the vane set to 0 degrees at the bow to generate absolute wind speed (EWSASS01) and direction (EWDASS01).
Manufacturers Calibrations
Irradiance channels (PAR and TIR)
The manufacturer's calibrations from the sheets supplied by NMF-SS have been applied through the BODC Calibration database.
BODC ICALRF 6767 DWIRRSSD = DVLTRSSD * 93896.714 from calibration coefficient 10.65 µV / W m-2
BODC ICALRF 6772 DWIRRPSD = DVLTRPSD * 96911.968 from calibration coefficient 10.11 µV / W m-2
BODC ICALRF 6770 CSLRRS01 = CVLTRS01 * 91742.119 from calibration coefficient 10.90 µV / W m-2
BODC ICALRF 6771 CSLRRP01 = CVLTRP01 * 84459.459 from calibration coefficient 11.84 µV / W m-2
Transmissometer
The manufacturer's calibrations from the sheets supplied by NMF-SS have been applied through the BODC Calibration database.
BODC ICALRF 6774 POPTDR01 = 100 * (TVLTDR01 -0.060) / (4.665 - 0.060) = 21.7155 * TVLTDR01 - 1.3029
BODC ICALRF 6724 ATTNDR01 = -(1/0.25) * ln (POPTDR01 * 0.01)
Project Information
Oceans 2025 Theme 10, Sustained Observation Activity 1: The Atlantic Meridional Transect (AMT)
The Atlantic Meridional Transect has been operational since 1995 and through the Oceans 2025 programme secures funding for a further five cruises during the period 2007-2012. The AMT programme began in 1995 utilising the passage of the RRS James Clark Ross between the UK and the Falkland Islands southwards in September and northwards in April each year. Prior to Oceans 2025 the AMT programme has completed 18 cruises following this transect in the Atlantic Ocean. This sustained observing system aims to provide basin-scale understanding of the distribution of planktonic communities, their nutrient turnover and biogenic export in the context of hydrographic and biogeochemical provinces of the North and South Atlantic Oceans.
The Atlantic Meridional Transect Programme is an open ocean in situ observing system that will:
- give early warning of any fundamental change in Atlantic ecosystem functionng
- improve forecasts of the future ocean state and associated socio-economic impacts
- provide a "contextual" logistical and scientific infrastructure for independently-funded national and international open ocean biogeochemical and ecological research.
The specific objectives are:
- To collect hydrographic, chemical, ecological and optical data on transects between the UK and the Falkland Islands
- To quantify the nature and causes of ecological and biogeochemical variability in planktonic ecosystems
- To assess the effects of variability in planktonic ecosystems on biogenic export and on air-sea exchange of radiatively active gases
The measurements taken and experiments carried out on the AMT cruises will be closely linked to Themes 2 and 5. The planned cruise track also allows for the AMT data to be used in providing spatial context to the Sustained Observation Activities at the Porcupine Abyssal Plain Ocean Observatory (SO2) and the Western Channel Observatory (SO10).
More detailed information on this Work Package is available at pages 6 - 9 of the official Oceans 2025 Theme 10 document: Oceans 2025 Theme 10
Weblink: http://www.oceans2025.org/
Data Activity or Cruise Information
Cruise
| Cruise Name | JC079 (AMT22) |
| Departure Date | 2012-10-10 |
| Arrival Date | 2012-11-24 |
| Principal Scientist(s) | Glen A Tarran (Plymouth Marine Laboratory) |
| 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 |
