Metadata Report for BODC Series Reference Number 1368798
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
Data Description |
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Time Co-ordinates(UT) |
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Parameters |
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Problem Reports
No Problem Report Found in the Database
AMT22 (JC079) 3D wind and motion measurements from the meteorological platform Data Qaulity Report
There are no known additional data quality issues.
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
AMT22 (JC079) 3D wind and motion measurements from the meteorological platform instrumentation
The following table is the instrument used to obtain the 3D wind and motion measurements:
| Instrument Name | Instrument Manufacturer | Instrument Model | Serial Number |
|---|---|---|---|
| Gill Windmaster 3D Sonic Anemometer | Gill Instruments | Windmaster | N/A |
Gill Instruments Ltd WindMaster and WindMaster pro ultrasonic anemometer
The WindMaster and the WindMaster Pro are three axis ultrasonic anemometers measuring wind speed and direction with no moving parts. The instrument measures the time taken for an ultrasonic pulse of sound to travel from an upper transducer to the opposite lower transducer, and compares it with the time for a pulse to travel from lower to upper transducer. The units of wind speed, output rate, and formats are all user selectable. There are several optional analogue outputs and inputs depending on the model (see table below).
The models WindMaster 1086-PK-046 and WindMaster pro 1352-PK-001 were replaced by the models WindMaster 1590-PK-020 and WindMaster pro 156-PK-020 in 2006. See the table below for the specification differences between models and the manufacturer's documentation.
| Specification | WindMaster 1086-PK-046 | WindMaster pro 1352-PK-001 | WindMaster 1590-PK-020 | WindMaster pro 156-PK-020 |
|---|---|---|---|---|
| Output rate | 1 or 4 Hz | 1, 2, 4, 5, 8 or 10 Hz | 1, 2, 4, 8, 10, 16, 20, (32 option) Hz | 1, 2, 4, 8, 10, 16, 20, 32 Hz |
| Sample rate | 39 Hz | 39 Hz | 20 or 32 Hz | 20 or 32 Hz |
| Units of measure | UVW, Polar, NMEA, Tunnel/m s-1, Knots, mph, kph | UVW, Polar, NMEA/m s-1, knots, mph, kph | m s-1, mph, kph, knots, ft min-1 | m s-1, mph, kph, knots, ft min-1 |
| Format | 8 data, odd, even or no parity | 7 or 8 data, odd, even or no parity | UVW or Polar | UVW or Polar |
| Averaging | 3, 5 or 10 seconds | 3, 5 or 10 seconds | 0 - 3600 seconds | 0 - 3600 seconds |
| Wind speed range | 0 - 60 m s-1 (0 - 134 mph) | 0 - 60 m s-1 (0 - 134 mph) | 0 - 45 m s-1 | 0 - 65 m s-1 |
| Wind speed resolution | 0.01 m s-1 | 0.01 m s-1 | 0.01 or 0.001 m s-1 | 0.01 or 0.001 m s-1 |
| Wind speed accuracy | 1.5% root mean square (0 - 20 m s-1) | 1.5% root mean square (0 - 20 m s-1) | < 1.5% root mean square (12 m s-1) | < 1.5% root mean square (12 m s-1) |
| Wind direction range | 0 - 359° | 0 - 359° | 0 - 359.9° | 0 - 359.9° |
| Wind direction resolution | 1° | 1° | 1° or 0.1° | 1° or 0.1° |
| Wind direction accuracy | ± 2° (< 25 m s-1) | ± 2° (< 25 m s-1) | ± 2° (12 m s-1) | ± 2° (12 m s-1) |
| Speed of sound range | N/A | 300 - 370 m s-1 | 300 - 370 m s-1 | 300 - 370 m s-1 |
| Speed of sound resolution | N/A | 0.01 m s-1 | 0.01 m s-1 | 0.01 m s-1 |
| Speed of sound accuracy | N/A | 3% root mean square (<20 m s-1) | <0.5% (20°) | <0.5% (20°) |
| Digital output protocol | RS422 | RS422 | RS232, RS422, RS485 | RS232, RS422, RS485 |
| Analogue outputs | 4 channels | N/A | 4 channels | 4 channels |
| Analogue inputs | 3 channels | 8 single-ended or 4 differential | 4 single-ended or 2 differential | 4 single-ended or 2 differential |
| Documentation | 1086-PK-046 | 1352-PK-001 | 1590-PK-020 | 156-PK-020 |
For more general information about these instruments, see the specification sheets for the WindMaster and the WindMaster pro.
AMT22 (JC079) 3D wind and motion measurements from the meteorological platform processing document
Data Aquisition and Analysis
3-D wind and motion were measured from the meteorological platform of RSS James Cook, at 18 m above mean sea level. The raw data files at a high frequency of 10 Hz were too large to submit to BODC. Interested users may contact the originator directly for the high frequency data. The 1-minute average winds are submitted here (note that ship's motion averages out to near zero at 1 minute intervals, and so it is not included).
Originator's Processing
True wind direction and speed are derived from measured (relative) winds using ship's speed and direction. Because of airflow distortion from the ship's search light left of the PML wind sensor, only the relative wind direction sector between -50 to +110 deg (based on ship's winds) remains valid.
BODC Processing
The data were submitted to BODC as a text file in a zip file alongside the Oxygenated Volatile Organic Compound (OVOC) data and an accompanying data description in a Word Document. A new wind data file was then created to concatenate the wind data with the underway latitude and longitude so that the data could then be transferred to the BODC format and loaded to the database. Parameter codes defined in the BODC dictionary were assigned to the variables as shown in the table below:
| Originator's Parameter | Originator's Units | Originator's Description | BODC Parameter Code | BODC Units | BODC Description | Comments |
|---|---|---|---|---|---|---|
| N/A | N/A | N/A | ALATGP01 | Degrees | Latitude north (WGS84) by unspecified GPS system | Latitude from the underway system |
| N/A | N/A | N/A | ALONGP01 | Degrees | Longitude east (WGS84) by unspecified GPS system | Longitude from the underway system |
| TWindSpeed_m_per_s | m/s | True wind speed over earth | EWSONE01 | Degrees | Wind speed (1-minute mean) in the atmosphere by in-situ anemometer | |
| TWindDir_deg | degrees | True wind direction over earth | EWDONE01 | Degrees | Wind from direction (1-minute mean) in the atmosphere by in-situ anemometer | |
| RWindSpeed_m_per_s | m/s | Relative (measured) wind speed | ERWSSO01 | Degrees | Wind speed (relative to moving platform (3D resultant)) in the atmosphere by in-situ sonic anemometer and expressed at measurement altitude | |
| RWindDir_deg | degrees | Relative (measured) wind direction | ERWDSO01 | Degrees | Wind direction (relative to moving platform) in the atmosphere by in-situ sonic anemometer and expressed at measurement altitude | The direction was converted to be 0 to 360 with 90 as starboard in order to map to the BODC parameter |
Screening
The data were screened using the in-house BODC software, Edserplo.
The only data that were flagged as suspect 'M' were cycle numbers 52931 - 52939, due to the other paramaters lacking any relevant supporting data and were already set as Null 'N'.
References
Yang, M., Beale, R., Liss, P., Johnson, M., Blomquist, B. and Nightingale, P. (2014). Air-sea fluxes of oxygenated volatile organic compounds across the Atlantic Ocean. 14, 8015-8061, doi:0.5194/acpd-14-8015-2014
Project Information
No Project Information held for the Series
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 |
