Metadata Report for BODC Series Reference Number 1760579
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
RRS James Cook cruise JC132 Meteorology Quality Report
Wind sensors
Several sudden drops or spikes in absolute wind speed were recorded during changes in the ship's heading and when the relative wind direction was at 180 degrees. The effect occasionally resulting in increased air pressure and air temperature. This strongly suggests a temporary shielding of the anemometer, and air pressure, air temperature, relative humidity and wind were therefore flagged.
A large number of spikes in the true wind direction were detected and flagged accordingly.
Wind speed appeared suspect between 15/02/2016 03:06:00 and 12:19:00 and was therefore flagged appropriately.
Light sensors
All PAR and TIR channels display consistent negative readings during night time. This most likely results from excessive loss of radiation after sunset, which suggests that day-time data recorded during cloud cover should also be treated with caution. Another explanation would be that outdated calibrations added an offset to the data. All negative PAR and TIR data were flagged.
There appeared to be several instances of shading between the original port/starboard PAR and TIR sensor pairs. This issue was solved by creating a new, unique channel for PAR and TIR respectively, composed of the maximum values per data cycle between each pair of sensors.
Air temperature, relative humidity and atmospheric pressure
Where instances of wind shielding have been identified, the effect in the air temperature, humidity and pressure channels have been flagged.
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
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 |
RRS James Cook cruise JC132 Meteorology Instrumentation
Instrumentation
The meteorological suite of sensors was located on the forecastle deck, at approximately 17.4 m above sea level. The anemometer orientation was 0° on the bow.
| Manufacturer | Model | Serial number | Last manufacturer's calibration date | Comments |
| Skye | SKE 510 | 1204 28562 | 02/04/2014 | Port |
| Skye | SKE 510/S | 1204 028557 | 30/04/2015 | Starboard |
| Kipp and Zonen | CM 6B | 047462 | 01/06/2015 | Port |
| Kipp and Zonen | CM 6B | 047463 | 15/06/2015 | Starboard |
| Gill | Windsonic | 064537 | - | No calibration required |
| Vaisala | Humidity and Temperature Probe HMP45 | E1055002 | 15/06/2015 | No calibration required |
| Vaisala | PTB110 Barometer Air pres | L2240581 | 28/05/2015 | No calibration required |
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 PTB110 barometer
An industrial, analog barometer which uses a silicon capacitive sensor (BAROCAP). The sensor produces either frequency or voltage output and is mountable on a (35 mm wide) DIN rail.
Operating ranges (1 hPa = 1 mbar)
| Pressure ranges | 500 ... 1100 hPa 600 ... 1100 hPa 800 ... 1100 hPa 800 ... 1060 hPa 600 ... 1060 hPa |
| Temperature range | -40 ... +60 °C (-40 ... +140 °F) |
| Humidity range | non-condensing |
General
| Output voltage | 0 ... 2.5 VDC 0 ... 5 VDC |
| Output frequency | 500 ... 1100 Hz |
| Resolution | 0.1 hPa |
Accuracy
| Linearity* | ±0.25 hPa |
| Hysteresis* | ±0.03 hPa |
| Repeatability* | ±0.03 hPa |
| Pressure calibration uncertainty** | ±0.15 hPa |
| Accuracy at +20 °C*** | ±0.3 hPa |
| Total accuracy at: | |
| +15 ... +25 °C (+59 ... +77 °F) 0 ... +40 °C (+32 ... +104 °F) -20 ... +45 °C (-4 ... +113 °F) -40 ... +60 °C (-40 ... +140 °F) | ±0.3 hPa ±0.6 hPa ±1.0 hPa ±1.5 hPa |
* Defined as ±2 standard deviation limits of end-point non-linearity, hysteresis error or repeatability error.
** Defined as ±2 standard deviation limits of inaccuracy of the working standard including traceability to NIST.
*** Defined as the root sum of the squares (RSS) of end-point non-linearity, hysteresis error, repeatability error and calibration uncertainty at room temperature when using voltage output.
More detailed information can be found in the manufacturer's data sheet and user's guide.
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.
RRS James Cook cruise JC132 Meteorology Processing Procedures
Originator's Data Processing
The data were logged by the TECHSAS (TECHnical and Scientific sensors Acquisition System) version 5.9 data logging system into daily NetCDF files which were provided to BODC for processing. Data was additionally logged into the RVS Level-C format which have been archived at BODC.
Files delivered to BODC
| Filename | Content description | Format | Interval | Start date/time (UTC) | End date/time (UTC) | Comments |
| yyyymmdd-104201-MET-JC-SM_JC1.SURFMETv2 | Air temperature, humidity, relative wind speed, relative wind direction | NetCDF | ~ 1 sec. | 13/01/2016 10:42:01 | 22/02/2016 22:12:27 | |
| yyyymmdd-104201-Light-JC-SM_JC1.SURFMETv2 | Air pressure, PAR, TIR | NetCDF | ~ 1 sec. | 13/01/2016 10:42:01 | 22/02/2016 22:12:27 |
BODC Data Processing
The data were reformatted to BODC internal format using standard banking procedures. Data were averaged at 30 second intervals. The following table shows how variables within the file were mapped to appropriate BODC parameter codes:
yyyymmdd-104201-MET-JC-SM_JC1.SURFMETv2
| Originator's variable | Originator's units | Description | BODC Code | BODC Units | Unit conversion | Comments |
| direct | degrees | Apparent wind direction | ERWDSS01 | degrees | none | |
| speed | m/s | Apparent wind speed | ERWSSS01 | m/s | none | |
| airtemp | degree celsius | Air temperature | CDTAZZ01 | degrees celsius | none | |
| humid | % | Relative air humidity | CRELZZ01 | % | none | |
| time | days since 1899-12-30 00:00:00 UTC | Acquisition time | Not transferred |
yyyymmdd-104201-Light-JC-SM_JC1.SURFMETv2
| Originator's variable | Originator's units | Description | BODC Code | BODC Units | Unit conversion | Comments |
| ptir | Volt x 10-5 | Port total irradiance | CVLTRP01 | Volts | /100000 | |
| stir | Volt x 10-5 | Starboard total irradiance | CVLTRS01 | Volts | /100000 | |
| ppar | Volt x 10-5 | Port side PAR sensor | DVLTRPSD | Volts | /100000 | |
| spar | Volt x 10-5 | Port side starboard sensor | DVLTRSSD | Volts | /100000 | |
| pres | hectopascal | Atmospheric pressure | CAPHTU01 | millibar | none | |
| time | days since 1899-12-30 00:00:00 UTC | Acquisition time | Not transferred |
All data expressed at measurement altitude.
Calibrations
Field Calibrations
No field calibrations were applied to the data at BODC.
Manufacturers Calibrations
Absolute wind speed and direction
Relative wind speed and direction were corrected for the ship's heading and speed using the POS MV gyro heading, ship velocities (calculated at BODC from the main positional channels) and an anemometer orientation of 0° on the bow, thus obtaining the BODC derived absolute wind speed and direction parameters, with codes EWSBSS01 and ERWDSS01 respectively.
PAR and TIR
The following manufacturer's calibrations were applied to the PAR and TIR light sensors using:
Calibrated (W m-2) = (raw x 106) / offset
Where 'Calibrated' is the calibrated data, 'raw' is the raw data (input), and 'offset' is the manufacturer's calibration offset in µV per W m-2 as shown in the table below:
| Sensor | Serial Number | Sensor location | Offset (µV per W m-2) |
| PAR | SKE510 1204 28562 | Port | 10.61 |
| PAR | SKE510/S 1204 28557 | Starboard | 10.83 |
| TIR | 047463 | Starboard | 10.62 |
| TIR | 047462 | Port | 11.87 |
Subsequently, the maximum values between the port-side and starboard-side sensor pairs were extracted into single new PAR and TIR data channels to eliminate the effects of shading. These resulted in the BODC derived parameters DWIRRXMX and CSLRR1XS.
All the reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag.
Air pressure
A manufacturer's calibration was not applied to the barometer because there was no significant offset reported on the certified calibration certificate.
Air temperature and humidity
Manufacturer's calibrations were not applied to the temperature and humidity probe because there were no significant offsets reported on the certified calibration certificate.
Project Information
No Project Information held for the Series
Data Activity or Cruise Information
Cruise
| Cruise Name | JC132 |
| Departure Date | 2016-01-14 |
| Arrival Date | 2016-02-24 |
| Principal Scientist(s) | Christine Peirce (University of Durham, Department of Earth Sciences), Timothy Reston (University of Birmingham School of Geography, Earth and Environmental Sciences) |
| 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 |
