Metadata Report for BODC Series Reference Number 2053978
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
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
DY116 Underway Meteorology Instrumentation
Instrumentation
The meteorological suite of sensors was located on the forecastle deck, between 18.06 and 19.71 m above sea level. The anemometer orientation was 0° on the bow.
| Manufacturer | Model | Main Function | Serial number | Last calibration date | Comments |
| Skye | SKE 510 | Photosynthetically Active Radiation (PAR) | 48927 | 15/09/2020 | Port |
| Skye | SKE 510 | Photosynthetically Active Radiation (PAR) | 28563 | 15/09/2020 | Starboard |
| Kipp & Zonen | CM 6B | Total Incident Radiation (TIR) | 962276 | 11/09/2019 | Port |
| Kipp & Zonen | CM 6B | Total Incident Radiation (TIR) | 962301 | 14/08/2019 | Starboard |
| Gill | WindSonic | Wind speed & direction | 10280018 | - | No calibration required |
| Vaisala | HMP155 | Air temperature & humidity | K0950058 | 17/08/2020 | - |
| Vaisala | PTB210 | Air pressure | N0930256 | 13/08/2020 | - |
 |
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 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.
DY116 Underway Meteorology Data Processing Procedures
Originator's Data Processing
The data were logged by the TECHSAS (TECHnical and Scientific sensors Acquisition System) version 5.11 data logging system which is the main data logging system on NMF-SS operated research vessels. Data were processed daily using the National Oceanography Centre data processing routines into NetCDF files, and these TECHSAS (NetCDF) navigation and bathymetry files provided to BODC were used for BODC processing. Please refer to the DY116 cruise report for more information.
Files delivered to BODC
| Filename | Content description | Format | Interval | Start date/time (UTC) | End date/time (UTC) | Comments |
| *-*-MET-SURFMET.SURFMETv3 | Air temperature, humidity, relative wind speed, relative wind direction | NetCDF | 1 sec. | 09-Nov-2020 16:07:13 | 26-Nov-2020 14:32:07 | |
| *-*-Light-SURFMET.SURFMETv3 | Air pressure, PAR, TIR | NetCDF | 1 sec. | 09-Nov-2020 16:07:13 | 26-Nov-2020 14:32:07 |
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:
*-*-MET-SURFMET.SURFMETv3
| 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 |
*-*-Light-SURFMET.SURFMETv3
| 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 |
All data expressed at measurement altitude.
Calibrations
Field Calibrations
No field calibrations were applied to the data at BODC.
Manufacturers Calibrations
Air pressure
A manufacturer's calibration was not applied to the Vaisala PTB110 barometer because there was no significant offset reported on the certified calibration certificate.
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 | 48927 | Port | 10.11 |
| PAR | 28563 | Starboard | 9.398 |
| TIR | 962276 | Port | 10.17 |
| TIR | 962301 | Starboard | 9.76 |
Relative wind speed and direction
Relative wind speed and direction were corrected for the ship's heading and speed using the POSMV gyro heading, ship velocities (calculated at BODC from the main positional channels) and an anemometer orientation of 0° on the bow following the Shipboard Automated Meteorological and Oceanographic System (SAMOS) method, thus obtaining the BODC derived absolute wind speed and direction parameters, with codes EWSBSS01 and EWDASS01 respectively.
Relative humidity and air temperature
Manufacturer's calibrations were not applied to the Vaisala HMP45AL temperature and humidity probe data because there were no significant offsets reported on the certified calibration certificate.
Screening
All reformatted data were visualised using the in-house EDSERPLO software. Where calibrations had been applied, only the calibrated versions of those parameters were screened. Suspect data were marked by adding an appropriate quality control flag.
Project Information
Marine LTSS: CLASS (Climate Linked Atlantic Sector Science)
Introduction
CLASS is a five year (2018 to 2023) programme, funded by the Natural Environment Research Council (NERC) and extended until March 2024.
Scientific Rationale
The ocean plays a vital role in sustaining life on planet Earth, providing us with both living resources and climate regulation. The trajectory of anthropogenically driven climate change will be substantially controlled by the ocean due to its absorption of excess heat and carbon from the atmosphere, with consequent impacts on ocean resources that remain poorly understood. In an era of rapid planetary change, expanding global population and intense resource exploitation, it is vital that there are internationally coordinated ocean observing and prediction systems so policy makers can make sound evidence-based decisions about how to manage our interaction with the ocean. CLASS will underpin the UK contribution to these systems, documenting and understanding change in the marine environment, evaluating the impact of climate change and effectiveness of conservation measures and predicting the future evolution of marine environments. Over the five-year period CLASS will enhance the cost-effectiveness of observing systems by migrating them towards cutting edge autonomous technologies and developing new sensors. Finally, CLASS will create effective engagement activities ensuring academic partners have transparent access to NERC marine science capability through graduate training partnerships and access to shipborne, lab based and autonomous facilities, and modelling capabilities.
Data Activity or Cruise Information
Cruise
| Cruise Name | DY116 |
| Departure Date | 2020-11-10 |
| Arrival Date | 2020-11-26 |
| Principal Scientist(s) | Andrew R Gates (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 |
