Metadata Report for BODC Series Reference Number 1964976
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
ERWDSS01
Wind channels are unreliable as changes in the ship's direction appears to be affecting the accuracy of the anemometers. Numerous variations in wind speed are observed which coincides with changes in the ship's heading. All wind channels have been flagged entirely as a result.
EWDASS01
Wind channels are unreliable as changes in the ship's direction appears to be affecting the accuracy of the anemometers. Numerous variations in wind speed are observed which coincides with changes in the ship's heading. All wind channels have been flagged entirely as a result.
ERWSSS01
Wind channels are unreliable as changes in the ship's direction appears to be affecting the accuracy of the anemometers. Numerous variations in wind speed are observed which coincides with changes in the ship's heading. All wind channels have been flagged entirely as a result.
EWSBSS01
Wind channels are unreliable as changes in the ship's direction appears to be affecting the accuracy of the anemometers. Numerous variations in wind speed are observed which coincides with changes in the ship's heading. All wind channels have been flagged entirely as a result.
RRS Discovery DY090 Meteorology Quality Control Report
Light sensors
The light channels look good overall. There was occasional shading on both the port and the starboard of the PAR and TIR sensors. There are some drop-outs within the dataset. This is possibly due to sensor malfunctions. These were observed at the start of the dataset, on May 23rd at approximately 08:00 and 12:20, May 28th at approximately 13:25 and Jun 26th at approximately 05:10. These were flagged accordingly.
Air temperature, relative humidity and atmospheric pressure
The Temperature, pressure and Humidity readings are within their expected ranges. Some drop-outs were observed in the Air Temperature, Relative Humidity and Atmospheric Pressure sensors in both the TIR and the PAR channels.
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
RRS Discovery Cruise DY090 Underway Document
Cruise Details
| Cruise Details | 23rd May 2018 - 28th June 2018 (UTC) |
| Principal Scientific Officer | Dr. Stephanie Henson (National Oceanography Centre, Southampton) |
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 Discovery DY090 Meteorology Instrumentation
Instrumentation
The meteorological suite of sensors was located on the forecastle deck, at approximately 18.06m above sea level. The anemometer orientation was 0° on the bow.
| Manufacturer | Model | Serial number | Last manufacturer's calibration date | Comments |
| Skye | SKE 510 | 28557 | 08/08/2017 | Starboard |
| Skye | SKE 510 | 38884 | 23/11/2016 | Port |
| Kipp and Zonen | CM6B | 962301 | 29/08/2017 | Starboard |
| Kipp and Zonen | CM6B | 962276 | 29/08/2017 | Port |
| Gill | Windsonic | 10280018 | N/A | No calibration required |
| Vaisala | Humidity and Temperature Probe HMP 45 | K0950057 | 03/01/2018 | No calibration required |
| Vaisala | PTB210C Barometer Air pres | P1640266 | 19/04/2018 | 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 PTB210 Digital Barometer
The basic specifications for this pressure sensor are as follows:
- Manufacturer: Vaisala
- Type: Silicon capacitive sensor
- Model: PTB210
- Range: 900 - 1100 hPa
- Output: 0-5VDC
- Total Accuracy (20°C): ±0.30hPa
- Operating temperature: -40 to +60 deg C
- Weight: 110g
- Certification Ingress Protection: IP65
Further details can be found in the manufacturer's specification sheet.
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 Discovery DY090 Meteorology Data Processing Procedures
Originator's Data Processing
The data were logged by the TECHSAS (TECHnical and Scientific sensors Acquisition System) 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-000000-MET-DY-SM_DY1.SURFMETv2 | Air temperature, humidity, relative wind speed, relative wind direction | NetCDF | 1 sec. | 21-May-2018 13:11:12 | 27-Jun-2018 11:57:22 | |
| yyyymmdd-000000-Light-DY-SM_DY1.SURFMETv2 | Air pressure, PAR, TIR | NetCDF | 1 sec. | 21-May-2018 13:11:12 | 27-Jun-2018 11:57:22 |
BODC Data Processing
The data were reformatted to BODC internal format using standard banking procedures. Data were averaged at 60 second intervals. The following table shows how variables within the file were mapped to appropriate BODC parameter codes:
yyyymmdd-000000-MET-DY-SM_DY1.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-000000-Light-DY-SM_DY1.SURFMETv2
| Originator's variable | Originator's units | Description | BODC Code | BODC Units | Unit conversion | Comments |
| ptir | Volt x 105 | Port total irradiance | CVLTRP01 | Volts | /100000 | |
| stir | Volt x 105 | Starboard total irradiance | CVLTRS01 | Volts | /100000 | |
| ppar | Volt x 105 | Port side PAR sensor | DVLTRPSD | Volts | /100000 | |
| spar | Volt x 105 | 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
PAR/TIR
The following manufacturer's calibrations were applied to the PAR and TIR light sensors using:
y (W m -2 ) = (a x 10 6 )/b
where 'a' is the raw data in volts and 'b' is the calibration offset (µV per W m -2 ) as shown below.
| Sensor | Serial no | location | offset (µV per W m -2 ) |
| PAR | 38884 | Port | 9.435 |
| PAR | 28557 | Starboard | 10.57 |
| TIR | 962276 | Port | 10.10 |
| TIR | 962301 | Starboard | 9.78 |
All the reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag
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.
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
Controls over Ocean Mesopelagic Interior Carbon Storage: COMICS
COMICS is a four-year collaborative research project that aims to quantify the flow of carbon in the ocean?s ?twilight? zone in order to accurately model global climate change. This ?twilight? zone is the part of the ocean between 100m and 1000m below the sea surface, where only a small amount of light from the sun can still penetrate.
By investigating carbon dynamics in the ocean interior, COMICS will help to improve predictions of future global climate change.
The COMICS project is led by the National Oceanography Centre and is a collaboration between the British Antarctic Survey and the universities of Queen Mary London, Liverpool, Oxford and Southampton. The project received funding from the Natural Environmental Research Council and runs between April 2017 and 2021.
Data Activity or Cruise Information
Cruise
| Cruise Name | DY090 |
| Departure Date | 2018-05-23 |
| Arrival Date | 2018-06-28 |
| Principal Scientist(s) | Stephanie Henson (National Oceanography Centre, Southampton) |
| Ship | RRS Discovery |
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 |
