Metadata Report for BODC Series Reference Number 1762341


Metadata Summary

Data Description

Data Category Meteorology -unspecified
Instrument Type
NameCategories
anemometer  anemometers
Vaisala PTB 210 digital barometer  meteorological packages
Rotronic Hygromet MP402H temperature and humidity probe  meteorological packages
Kipp and Zonen SP LITE2 pyranometer  radiometers
Kipp and Zonen PSQ1 PAR Quantum Sensor  radiometers
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Rob Thomas
Originating Organization British Oceanographic Data Centre, Liverpool
Processing Status banked
Project(s) -
 

Data Identifiers

Originator's Identifier JR20140922_PRODQXF_MET
BODC Series Reference 1762341
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2014-09-22 20:10
End Time (yyyy-mm-dd hh:mm) 2014-11-02 13:01
Nominal Cycle Interval 60.0 seconds
 

Spatial Co-ordinates

Southernmost Latitude 51.69167 S ( 51° 41.5' S )
Northernmost Latitude 53.63400 N ( 53° 38.0' N )
Westernmost Longitude 57.83000 W ( 57° 49.8' W )
Easternmost Longitude 1.93000 E ( 1° 55.8' E )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth -20.0 m
Maximum Sensor Depth -15.3 m
Minimum Sensor Height -
Maximum Sensor Height -
Sea Floor Depth -
Sensor Distribution Scattered at fixed depths - The sensors are scattered with respect to depth but each remains effectively at the same depth 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)
ALATGP01 1 Degrees Lat_GPS Latitude north (WGS84) by unspecified GPS system
ALONGP01 1 Degrees Lon_GPS Longitude east (WGS84) by unspecified GPS system
CAPHTU01 1 Millibars Air_press Pressure (measured variable) exerted by the atmosphere by barometer and expressed at measurement altitude
CDTAZZ01 1 Degrees Celsius AirTemp Temperature of the atmosphere by thermometer
CRELZZ01 1 Percent Air_humid Relative humidity of the atmosphere
CSLRR101 1 Watts per square metre Solar_rad Downwelling vector irradiance as energy (solar (300-3000nm) wavelengths) in the atmosphere by pyranometer
EWDASS01 1 Degrees True WindDirFrom Wind from direction in the atmosphere by in-situ anemometer
EWSBSS01 1 Metres per second WindSpd Wind speed in the atmosphere by in-situ anemometer
IRRDSV01 1 MicroEinsteins per square metre per second SurfVPAR Downwelling vector irradiance as photons (PAR wavelengths) in the atmosphere by cosine-collector radiometer
PARERXSD 1 MicroEinsteins per square metre per second SurfVPAR2 Downwelling vector irradiance as photons (PAR wavelengths) in the atmosphere by cosine-collector radiometer (second sensor)
 

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

TIR sensors

The downwelling vector irradiance CSLRR102 had regular values below 0 and were considered suspicious and was thus dropped.

RRS James Clark Ross Cruise AMT24 (JR20140922) Meteorology Data Quality Document

The meteorology data have been through BODC quality control screening

Wind Channels

The relative wind speed and direction channels showed natural variation and fluctuation but there were no trends that stood out as unrealistic. Several data points were flagged where a shift in the ship's heading corresponded to a spike in corrected wind speed or direction. Overall the data for the cruise duration appeared good.

Air TEmperature, Pressure, Humidity

There was good agreement between the two sensors for each of pressure, air temperature and relative humidity. There did not appear to be any obvious influence of heading (and hence the ship's infrastructure) on the values of these channels. Clear spikes in the data were flagged as unrealistic.

PAR Sensors

Irradiance channels IRRDSV01 and PARERXSD were flagged where the data values went below zero during the night. A possible reason for these negative values is radiation loss at night from the sensors. Data above 2500 microeinsteins have also been flagged as these values were outside the expected range for the parameters. Overall, there was good agreement between both of the PAR sensor readings and the range of values appeared appropriate. Care should still be taken regarding negative IRRDSV01/PARERXSD data for these could be valid data.


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

Kipp & Zonen Photosynthetically Active Radiation Quantum Sensor PQS1

The PQS1 is an atmospheric radiometer designed to measure incident radiation at photosynthetically active radiation (PAR) wavelengths. It incorporates a diffuser with an excellent directional (cosine) response and a silicon photodiode detector.

If used in field research applications, the PQS1 can be connected with the METEON handheld display unit, which also as data-logging capability. For permanent installations, it can be connected to the LOGBOX SD data logger.

Specifications

Spectral range 400 to 700 nm (± 4 nm)
Sensitivity 4 to 10 µV µmol -1 m -2 s -1
Response time < 1 µs
Non linearity < 1% (0 to 10000 µV µmol -1 m -2 s -1 )
Temperature dependence < -0.1% °C -1
Sensitivity change per year < 2%
Directional error < 3% (up to 80° zenith angle)
Field of view 180°
Operating temperature -30 to 70°C
Relative humidity 0 to 100 % RH

A link to the PQS1 specification sheet can be found here: PQS1 Spec sheet

Kipp and Zonen SP Lite and SP Lite2 Silicon Pyranometer

An atmospheric pyranometer that measures solar radiation over the range 400-1100 nm by means of a silicon photo-diode detector mounted in a diffuser. The sensor measures the radiation received over the entire hemisphere and the diffuser's sensitivity is proportional to the cosine of the angle of incidence of the incoming radiation. The photodiode creates a voltage output that is proportional to the incoming radiation. The SP Lite2 supersedes the SP Lite and features an improved sensitivity and faster response time than its predecessor.

Specifications

Specification SP Lite SP Lite2
Spectral range 400-1100 nm 400-1100 nm
Sensitivity 100 µV W -1 m -2 60 to 100 µV W -1 m -2
Response time < 1 s < 500 ns
Maximum irradiance 2000 W m -2 2000 W m -2
Operating temperature -30 to 70°C -30 to 70°C
Temperature dependence 0.15% °C -1 0.15% °C -1

Further details can be found in the manufacturer's specification sheets for the SP Lite and SP Lite2 .

RRS James Clark Ross Cruise AMT24 (JR20140922) Meteorology Instrument Description Document

The table shows the meteorological instruments used to generate this dataset

Instrumentation

Manufacturer Model Main function Serial Number Comments
Seatex Seapath 320+ Position (Latitude and Longitude) - -
Rotronic MP402H-050300 Air temperature and relative humidity (port) 0060743898 27/04/2011
HC2-S3 0060599569 16/03/2011
Rotronic MP402H-050300 Air temperature and relative humidity (starboard) 0060743896 27/04/2011
HC2-S3 0060599557 16/03/2011
Vaisala Digital Barometer PTB210 CLass B Atmospheric Pressure V1450002 10/04/2010
Vaisala Digital Barometer PTB210 CLass B Atmospheric Pressure V1450003 10/04/2010
Kipp and Zonen PAR Quantum Sensor 1 (PQS 1) Photosynthetically Active Radiation (PAR) 110127 05/01/2011
Kipp and Zonen PAR Quantum Sensor 1 (PQS 1) Photosynthetically Active Radiation (PAR) 110126 05/01/2011
Kipp and Zonen SP Lite2 Total Irradiance 112993 26/01/2011
Kipp and Zonen SP Lite2 Total Irradiance 112992 26/01/2011

Rotronic Hygromet MP102H and MP402H temperature and humidity probes

This meteorological probe measures humidity and temperature with the plug-in HygroClip HC2-S3 sensor module, and can also be equipped with a signal conditioned Pt100 temperature probe.

The two models differ in that the MP102H produces a voltage output while the MP402H produces a current output. Other characteristics are common to both models.

The specification sheet can be accessed here Rotronic MP102H and MP402H .

Specifications

Start up time 3 s (typical)
Data refresh time 1 s (typical)
Humidity range 0 to 100% RH
Humidity accuracy 0.8% RH
Temperature range -40 to 80°C
Temperature accuracy 0.1°C
Maximum air velocity ar probe 20 m s -1
User configurable limits -999 to 9999 engineering units
HC2-S3 Probe material Polycarbonate
Probe dust filter Polyethylene

Vaisala PTB210 Digital Barometer

The basic specifications for this pressure sensor are as follows:

Further details can be found in the manufacturer's specification sheet .

RRS James Clark Ross Cruise AMT24 (JR20140922) Meteorology Processing Document

Originator's Data Processing

Meterological data were measured from instruments located on the RRS James Clark Ross meterological mast. Located at the bow of the ship TIR data originated from the Kipp and Zonen SPLite2 whilst the PAR data originated from the Kipp and Zonen PQS1. Air temperature and humidity data came from the Rotronic MP402H and wind data were obtained from the anemomenter.

The data streams were logged every second to the SCS system and merged into a comma separated file format (.ACO) with the corresponding header information stored in .TPL files. All files were averaged to 60 second intervals.

Filename Content Description Format Interval Start Date Start Time End Date End Time
seatex-gga.ACO Latitude and Longitude ASCII (.ACO) 1 Hz 11/09/2014 12:37:39 02/11/2014 15:47:52
oceanlogger.ACO Air temperature x2 channels ASCII (.ACO) ~1-2 Hz 18/09/2014 14:33:25 02/11/2014 15:47:00
Relative humidity x2 channels
Air pressure x2 channels
PAR x2 channels
TIR x2 channels
anemometer.ACO Wind speed and direction ASCII (.ACO) ~1 Hz 11/09/2014 12:37:39 02/11/2014 15:47:52

BODC Data Processing

Meteorological parameters were matched to BODC parameter codes and transferred to internal BODC format as outlined in the table below. Unit conversions were applied to data that were supplied in knots, as all other units were equivalent to the respective BODC parameter code units assigned. BODC processing procedures included loading of data and reduction through averaging, unit conversions, visual screening and flagging of anomalous values.

The table below shows the relevant parameter mappings, conversions made and any additional comments.

Originator's File Originator's Parameter Originator's Units Description BODC parameter code BODC units Comments and unit conversions
seatex-gga.ACO lat Degrees (+ve N) Latitude north (WGS84) by Seatex Seapath DGPS ALATGP01 Degrees (+ve N) -
seatex-gga.ACO lon Degrees (+ve E) Longitude east (WGS84) by Seatex Seapath DGPS ALONGP01 Degrees (+ve N) -
oceanlogger.ACO airtemp1 °C Temperature of the atmosphere by thermometer CDTAZZ01 Degrees Celsius -
oceanlogger.ACO airtemp2 °C Temperature of the atmosphere by thermometer (second sensor) CDTAZZ02 Degrees Celsius -
oceanlogger.ACO baro1 hPa Pressure (measured variable) exerted by the atmosphere by barometer and expressed at measurement altitude CAPHTU01 Millibars Units are equivalent
oceanlogger.ACO baro2 hPa Pressure (measured variable) exerted by the atmosphere by barometer (second sensor) and expressed at measurement altitude CAPHTU02 Millibars Units are equivalent
oceanlogger.ACO humidity1 % Relative humidity of the atmosphere CRELZZ01 Percent -
oceanlogger.ACO humidity1 % Relative humidity of the atmosphere by second sensor CRELZZ02 Percent -
anemometer.ACO wind_dir Degrees Wind direction (relative to moving platform) in the atmosphere by in-situ anemometer ERWDSS01 Degrees -
anemometer.ACO wind_speed knots Wind speed (relative to moving platform) in the atmosphere by in-situ anemometer ERWSSS01 Metres per second * 0.514444
- - - Wind direction in the atmosphere by in-situ anemometer EWDASS01 Degrees True Channel derived using BODC Matlab routine 'wincor'
- - - Wind speed in the atmosphere by in-situ anemometer EWSBSS01 Metres per second Channel derived using BODC Matlab routine 'wincor'
oceanlogger.ACO par1 µmol m -2 s -1 Downwelling vector irradiance as photons (PAR wavelengths) in the atmosphere by cosine-collector radiometer IRRDSV01 µE m -2 s -1 Units are equivalent
oceanlogger.ACO par2 µmol m -2 s -1 Downwelling vector irradiance as photons (PAR wavelengths) in the atmosphere by cosine-collector radiometer (second sensor) PARERXSD µE m -2 s -1 Units are equivalent
oceanlogger.ACO tir1 W m -2 Downwelling vector irradiance as energy (solar (300-3000 nm) wavelengths) in the atmosphere by pyranometer CSLRR101 W m -2 -
oceanlogger.ACO tir2 W m -2 Downwelling vector irradiance as energy (solar (300-3000 nm) wavelengths) in the atmosphere by pyranometer (second sensor) CSLRR102 W m -2 Values considered suspicious, often below zero.

Wind channels - calculation of absolute values

The BODC Matlab procedure 'wincor' was run using the relative wind speed (ERWSSS01) and direction (ERWDSS01) and ship's north-south and east-west velocities, with the vane set to 0 degrees at the bow. This program generated the absolute wind speed (EWSBSS01) and direction (EWDASS01).

Sample Calibrations

No sample calibrations were applied to these data


Project Information


No Project Information held for the Series

Data Activity or Cruise Information

Cruise

Cruise Name JR20140922 (AMT24, JR303)
Departure Date 2014-09-22
Arrival Date 2014-11-01
Principal Scientist(s)Tim Smyth (Plymouth Marine Laboratory)
Ship RRS James Clark Ross

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