Metadata Report for BODC Series Reference Number 1368798


Metadata Summary

Data Description

Data Category Winds -unspecified
Instrument Type
NameCategories
Gill Instruments Ltd WindMaster ultrasonic anemometer  anemometers
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Mingxi Yang
Originating Organization Plymouth Marine Laboratory
Processing Status banked
Project(s) -
 

Data Identifiers

Originator's Identifier OVOC_WINDS_LATLON
BODC Series Reference 1368798
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2012-10-11 03:03
End Time (yyyy-mm-dd hh:mm) 2012-11-20 05:47
Nominal Cycle Interval 60.0 seconds
 

Spatial Co-ordinates

Start Latitude 49.74520 N ( 49° 44.7' N )
End Latitude 45.50440 S ( 45° 30.3' S )
Start Longitude 5.82970 W ( 5° 49.8' W )
End Longitude 51.32480 W ( 51° 19.5' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth -18.0 m
Maximum Sensor Depth -18.0 m
Minimum Sensor Height -
Maximum Sensor Height -
Sea Floor Depth -
Sensor Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor Depth Datum Approximate - Depth is only approximate
Sea Floor Depth Datum -
 

Parameters

BODC CODE Rank Units Short Title Title
AADYAA01 1 Days Date(Loch_Day) Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01 1 Days Time(Day_Fract) Time (time between 00:00 UT and timestamp)
ACYCAA01 1 Dimensionless Record_No Sequence number
ALATGP01 1 Degrees Lat_GPS Latitude north (WGS84) by unspecified GPS system
ALONGP01 1 Degrees Lon_GPS Longitude east (WGS84) by unspecified GPS system
ERWDSO01 1 Degrees RelWinDirFrom_sonic Wind direction (relative to moving platform) in the atmosphere by in-situ sonic anemometer and expressed at measurement altitude
ERWSSO01 1 Metres per second RelWinSpd_sonic Wind speed (relative to moving platform (3D resultant)) in the atmosphere by in-situ sonic anemometer and expressed at measurement altitude
EWDONE01 1 Degrees True WindDir(1min_mean) Wind from direction (1-minute mean) in the atmosphere by in-situ anemometer
EWSONE01 1 Metres per second WindSpd(1min_mean) Wind speed (1-minute mean) in the atmosphere by in-situ anemometer
 

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

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° 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