Metadata Report for BODC Series Reference Number 1749258
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
UK Ocean Acidification RRS Discovery Cruise D366 Underway Meteorology Data Quality Report
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 wind speed and direction channels show natural variation but there were no trends that stood out as unrealistic. The absolute wind speed and direction channels were screened and a few spikes flagged suspect.
Irradiance channels
There were some point voltages which were out of range and needed to be flagged 'N'. The remainder of channels were not flagged as these channels by their nature exhibit natural variability and there were no obvious anomalies.
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 |
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 |
UK Ocean Acidification RRS Discovery Cruise D366 Underway Meteorology Instrumentation
The instruments used to collect the meteorology datasets are displayed in the table below.
| Sensor | Serial number | Calibration date | Deployment |
| Gill Wind sonic (Option 3) | 071123 | - | - |
| Skye Instruments SKE510 | 28558 | 12/06/2009 | Starboard |
| Skye Instruments SKE510 | 28563 | 30/07/2009 | Port |
| Kipp and Zonen Ltd CMB6 | 962276 | 17/09/2010 | Starboard |
| Kipp and Zonen Ltd CMB6 | 962301 | 19/02/2009 | Port |
| Vaisala PTB100A | S3440012 | 15/09/2010 | - |
| Vaisala HMP45A | E1055002 | 30/09/2010 | - |
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.
UK Ocean Acidification RRS Discovery Cruise D366 Underway Meteorology Data Processing Document
Originator's Data Processing
During the cruise there was a dual logging system in place on the RRS Discovery. 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.
Wind Channels
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 file. This program was designed to remove the relative variables from the wind data logged by surfmet.
Files delivered to BODC
| Filename | Data type | Start Calendar Day | Start Time | Finish Calendar Day | Finish Time | Interval |
| pro_wind | RVS Level-C processed | 2011-06-06 | 08:08:50 | 2011-07-09 | 12:55:30 | 10 seconds |
| surfmet | RVS Level-C raw | 2011-06-06 | 08:08:47 | 2011-07-09 | 12:55:53 | 1 sec |
BODC Data Processing
Reformatting
The RVS files were transferred into internal BODC format by merging the files into a single binary file using time as the primary linking key. The time span of the file was from 06/06/2011 08:08:50 to 09/07/2011 12:55:50, with a sampling interval of 60 seconds.
The meteorolgical data were transferred to BODC file format from the surfmet file.
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 (EWSBSS01) and direction (EWDASS01). The wind channels were screened and some flags applied to suspect data values.
The originator's variables were mapped to appropriate BODC parameter codes as follows:
surfmet
| Channels | Description | Units | BODC Parameter Code | Units | Conversion Factor |
| press | Pressure (measured variable) exerted by the atmosphere | 1 hPa | CAPHTU01 | 1 mbar | *1 |
| ppar | Raw port PAR sensor voltage | 10-2mV | DVLTRPSD - channel not transferred | V | *10-5 |
| spar | Raw starboard PAR sensor voltage | 10-2mV | DVLTRSSD - channel not transferred | V | *10-5 |
| speed | Relative wind speed | m s-1 | ERWSSS01 - channel not transferred | m s-1 | *1 |
| direct | Relative wind direction | Degrees | ERWDSS01 - channel not transferred | 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 - channel not transferred | V | *10-5 |
| stir | Raw starboard TIR sensor voltage | 10-2mV | CVLTRS01 - channel not transferred | V | *10-5 |
Screening
Each data channel was inspected on a graphics workstation and any spikes or periods of dubious data were flagged. The power of the workstation software was used to carry out comparative screening checks between channels by overlaying data channels. A map of the cruise track was simultaneously displayed in order to take account of the oceanographic context.
Field Calibrations
No calibration against sample data were applied to the meteorological channels.
Manufacturer's Calibrations
Irradiance channels
The following manufacturer's calibrations were applied to the PAR and TIR voltages sensors using the equation:
Calibrated PAR or TIR (W m-2 ) = (voltage x 10 6 ) / calibration coefficient
| Parameter and Instrument | Equation | calibration coefficient | Comments |
|---|---|---|---|
| Port PAR SKE 510 1204 28563 | DWIRRPSD = DVLTRPSD x 93545.37 | 10.69 µV / W m-2 | Merged to single parameter: DWIRRXMX |
| Starboard PAR SKE 510 1204 28558 | DWIRRSSD = DVLTRSSD x 91996.32 | 10.87 µV / W m-2 | |
| Port TIR Kipp and Zonen CMB6 962301 | CSLRRP01 = CVLTRP01 x 101626.02 | 9.84 µV / W m-2 | Merged to single parameter: CSLRR1XS |
| Starboard TIR Kipp and Zonen CMB6 962276 | CSLRRS01 = CVLTRS01 x 97276.26 | 10.28 µV / W m-2 |
The port and starboard channels for PAR and TIR were each merged based on the maximum value from the paired channels to give one definitive channel.
Project Information
UKOARP Theme B: Ocean acidification impacts on sea surface biology, biogeochemistry and climate
The overall aim of this theme is to obtain a quantitative understanding of the impact of ocean acidification (OA) on the surface ocean biology and ecosystem and on the role of the surface ocean within the overall Earth System.
The aims of the theme are:
- To ascertain the impact of OA on planktonic organisms (in terms of physiological impacts, morphology, population abundances and community composition).
- To quantify the impacts of OA on biogeochemical processes affecting the ocean carbon cycle (both directly and indirectly, such as via availability of bio-limiting nutrients).
- To quantify the impacts of OA on the air-sea flux of climate active gases (DMS and N2O in particular).
The main consortium activities will consist of in-situ measurements on three dedicated cruises, as well as on-deck bioassay experiments probing the response of the in-situ community to elevated CO2. Most of the planned work will be carried out on the three cruises to locations with strong gradients in seawater carbon chemistry and pH; the Arctic Ocean, around the British Isles and the Southern Ocean.
Weblink: http://www.oceanacidification.org.uk/research_programme/surface_ocean.aspx
Data Activity or Cruise Information
Cruise
| Cruise Name | D366 (D367) |
| Departure Date | 2011-06-06 |
| Arrival Date | 2011-07-09 |
| Principal Scientist(s) | Eric Pieter Achterberg (University of Southampton School of Ocean and Earth Science) |
| 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 |
