Metadata Report for BODC Series Reference Number 1760672


Metadata Summary

Data Description

Data Category Meteorology -unspecified
Instrument Type
NameCategories
anemometer  anemometers
Kipp and Zonen PAR LITE radiometer  radiometers
Kipp and Zonen SP LITE pyranometer  radiometers
Vaisala PTB 210 digital barometer  meteorological packages
Rotronic Instruments MP103A humidity and temperature probe  meteorological packages
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Stuart Painter
Originating Organization National Oceanography Centre, Southampton
Processing Status banked
Project(s) Oceans 2025 Theme 10 SO1:AMT
 

Data Identifiers

Originator's Identifier JR20081003_PRODQXF_MET
BODC Series Reference 1760672
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2008-10-03 09:25
End Time (yyyy-mm-dd hh:mm) 2008-11-09 15:30
Nominal Cycle Interval 60.0 seconds
 

Spatial Co-ordinates

Southernmost Latitude 49.17300 S ( 49° 10.4' S )
Northernmost Latitude 53.62680 N ( 53° 37.6' N )
Westernmost Longitude 53.82150 W ( 53° 49.3' W )
Easternmost Longitude 0.18890 W ( 0° 11.3' W )
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
CSLRR102 1 Watts per square metre Solar_rad2 Downwelling vector irradiance as energy (solar (300-3000nm) wavelengths) in the atmosphere by pyranometer (second sensor)
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
IRRDSS01 1 MicroEinsteins per square metre per second SurfSPAR Downwelling 2-pi scalar irradiance as photons (PAR wavelengths) in the atmosphere by 2-pi scalar radiometer
IRRDSS02 1 MicroEinsteins per square metre per second SurfSPAR2 Downwelling 2-pi scalar irradiance as photons (PAR wavelengths) in the atmosphere by 2-pi scalar 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

No Problem Report Found in the Database

RRS James Clark Ross Cruise JR20081003 (AMT18) Meteorology Quality Control Report

Wind sensors

The absolute wind speed is noisy but looks OK in terms of range and variations. Wind direction very variable too, but there was no obvious systematic interference with ship's structure.

Air temperature, relative humidity and atmospheric pressure

A number of short-lasting drops in air temperature (about 0.2 degree per minute followed by slow recovery at about half the rate) were noted, most notably on the 13-14/10/2008 and 19-26/10/2008. They were often associated with increases in relative humidity. Interference from the ship's operations or instrument malfunction or contamination was first suspected but after investigation no satisfactory explanation could be found other than natural causes and the data were left unflagged. There were no issues with the atmospheric pressure channel. There was good agreement between the two sensors.

Light sensors

Good agreement between the two total solar irradiance sensors. For the two PAR sensors, one of them (01) reads slightly lower (about 40 µE m2s-1) at noon than the other.


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 and Zonen PAR Lite Photosynthetically Active Radiation sensor

An atmospheric radiometer that measures photosynthetically active radiation (PAR) by means of a Teflon diffuser, an optical interference filter and a photo-diode detector. The sensor measures the PAR 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 optical filter has a spectral response of 400-700 nm (PAR wavelengths) and the photodiode creates a voltage output that is proportional to the incoming radiation.

Specifications

Spectral range 400-700 nm
Sensitivity 4-6 µV µmol -1 m -2 s -1
Response time < 0.1 s
Operating temperature -30 to 70 °C
Temperature dependence of sensitivity -0.1% °C -1
Directional error (up to 80 °) < 10 %

Further details can be found in the manufacturer's specification 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 JR20081003 (AMT18) Meteorology Instrumentation

The meteorological suite of sensors have been identified where possible from the BAS JCR data dictionary and a list of underway sensors that were present on the JCR at the start of 2008, which have been provided to BODC by BAS. The instruments used to collect this dataset are displayed in the table below.

Manufacturer Model Parameter Serial number Deployment location
Unspecified Anemometer EWDASS01 and EWSBSS01 - Foremast
Kipp and Zonen Ltd PAR sensor Quantum PAR LITE 0348900 IRRDSS01 990069 Foremast
Kipp and Zonen Ltd PAR LITE 0348900 IRRDSS02 990070 Foremast
Kipp and Zonen Ltd Pyranometer SP LITE 0339-900 CSLRR101 990684 Foremast
Kipp and Zonen Ltd SP LITE 0339-900 CSLRR102 990685 Foremast
Vaisala Digital barometer PTB210 Class B CAPHTU01 V145002 Logger rack
Vaisala PTB210 B1A2B (Class B) CAPHTU02 V145003 Logger rack
Rotronic Instruments (UK) Ltd Meteorology probe with air humidity and temperature sensors MP103A-CG030-W4W CDTAZZ01 43124 014 Foremast
Rotronic Instruments (UK) Ltd Meteorology probe with air humidity and temperature sensors MP103A-CG030-W4W CRELZZ01 43124 014 On deck

Rotronic Precision meteorology probes for relative humidity and temperature: MP100A and MP400A series

The MP100A and MP400A series probes comprise a platinum (Pt100) resistance thermometer (with direct or linear output signal) and a Rotronic HYGROMER-C94 humidity sensor.

Instruments from the two series function in the same manner, although the the MP100A series produces voltage output while the MP400A series produces a current output (amps). Differences between the various models in each series are restricted to operational temperature ranges, supply voltages and humidity output signals.

The following specifications are common to all MP100A and MP400A series probes:

Relative Humidity range 0-100 %
Response time

20 s (RH)

10 s (temp)

Accuracy

±1 % at 22°C (RH)

±0.3°C (temp)

Differences between the models are detailed below:

Model Supply voltage Temperature range Output signal (temperature) Output signal (humidity)
101A 4.8 to 30 V DC -40 to +60 °C -0.4 to +0.6 V DC 0 to 1 V DC
102A 4.8 to 30 V DC -30 to +70 °C 0 to 1 V DC 0 to 1 V DC
103A 4.8 to 30 V DC -40 to +60 °C 0 to 1 V DC 0 to 1 V DC
111A 3.6 to 12 V DC -40 to +60 °C -0.4 to +0.6 V DC 0 to 1 V DC
112A 3.6 to 12 V DC -30 to +70 °C 0 to 1 V DC 0 to 1 V DC
113A 3.6 to 12 V DC -40 to +60 °C 0 to 1 V DC 0 to 1 V DC
404A 4.8 to 30 V DC 0 to 100 °C 0 to 20 mA 0 to 20 mA
405A 4.8 to 30 V DC -40 to +60 °C 0 to 20 mA 0 to 20 mA
406A 4.8 to 30 V DC -30 to +70 °C 0 to 20 mA 0 to 20 mA
407A 4.8 to 30 V DC 0 to 100 °C 4 to 20 mA 4 to 20 mA
408A 4.8 to 30 V DC -40 to +60 °C 4 to 20 mA 4 to 20 mA
409A 4.8 to 30 V DC -30 to +70 °C 4 to 20 mA 4 to 20 mA

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

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 JR20081003 (AMT18) Meteorology Data Processing Procedures

Originator's Data Processing

Meteorological data were measured from instruments located on the RRS James Clark Ross meteorological mast. The data streams were logged every second to the SCS system to RVS files. The instruments logged the meteorological data to the oceanlogger and anemometer RVS files and the header information was stored in the corresponding .TPL files. The Oceanlogger data were processed daily by Stuart Painter and Jo Hopkins during the cruise. During processing the Oceanlogger data were converted from SCS format to PSTAR format. The wind data were not processed into PSTAR format on board so the most processed form of the wind data was in RVS format. The table below shows details of the original files delivered to BODC that contained the data in the final data series.

Filename Content Description Format Interval
olg.21837, olg.master, olg.21808
  • Air temperature
  • Relative humidity
  • PAR x2 channels
  • TIR x2 channels
  • Air pressure x2 channels
PSTAR 5 seconds
anemom.rvs Relative wind speed and direction RVS 1 second

BODC Data Processing

Meteorological data from processed PSTAR format files, along with wind measurements from the full-resolution RVS files were transferred to BODC's NetCDF format (QXF) under the BODC Underway Data System (BUDS). This transfer involved reducing the data by averaging to 60 second intervals. Directional data were reduced by averaging using a unit circle.

Originator's File Originator's Parameter Originator's Units Description BODC parameter BODC Units Comments and unit conversions
olg.21837, olg.master, olg.21808 press1 Millibars Pressure (measured variable) exerted by the atmosphere by barometer and expressed at measurement altitude CAPHTU01 mbar Units are equivalent, primary air pressure channel
olg.21837, olg.master, olg.21808 press2 Millibars Pressure (measured variable) exerted by the atmosphere by barometer and expressed at measurement altitude CAPHTU02 mbar Channel not transferred
olg.21837, olg.master, olg.21808 atemp1 °C Temperature (second sensor) of the atmosphere by dry bulb thermometer CDTAZZ01 °C -
olg.21837, olg.master, olg.21808 hum1 % Relative humidity of the atmosphere by humidity sensor CRELZZ01 % -
olg.21837, olg.master, olg.21808 par1 µmol m -2 s -1 Downwelling 2-pi scalar irradiance as photons in the atmosphere by 2-pi scalar radiometer IRRDSS01 µE m -2 s -1 Units are equivalent
olg.21837, olg.master, olg.21808 par2 µmol m -2 s -1 Downwelling 2-pi scalar irradiance as photons in the atmosphere by 2-pi scalar radiometer (second sensor) IRRDSS02 µE m -2 s -1 Units are equivalent
olg.21837, olg.master, olg.21808 tir1 W m -2 Downwelling vector irradiance as energy (solar (300-3000 nm) wavelengths) in the atmosphere by pyranometer CSLRR101 W m -2 -
olg.21837, olg.master, olg.21808 tir2 W m -2 Downwelling vector irradiance as energy (solar (300-3000 nm) wavelengths) in the atmosphere by pyranometer CSLRR102 W m -2 -
anemom.rvs wind_dir Degrees Wind direction (relative to moving platform) in the atmosphere by in-situ anemometer ERWDSS01 Degrees Channel not transferred
anemom.rvs wind_spd m s -1 Wind speed (relative to moving platform) in the atmosphere by in-situ anemometer ERWSSS01 m s -1 Channel not transferred
- - - Wind speed in the atmosphere by in-situ anemometer EWSBSS01 m s -1 Channel derived using BODC Matlab routine 'wincor'
- - - Wind direction in the atmosphere by in-situ anemometer EWDASS01 Degrees true Channel derived using BODC Matlab routine 'wincor'

Wind sensors

Relative wind speed and direction were logged from the meteorological package during the cruise and saved in RVS format in the file 'anemom'. The anemometer was positioned with 0 degrees at the ship's bow. The ship's speed relative to the ground was calculated during the 'bestnav' processing using the ship's navigational information and the ship's heading. At BODC after screening of the navigation channels was completed the speed over ground and heading data were then used to correct the wind channels for the effect of the ship's movement using a BODC MATLAB program ('wincor') and absolute wind speed and direction channels were created.

Atmospheric sensors

The logged measurements from the ship's atmospheric sensors (pressure, temperature, humidity and solar irradiance - total and PAR) were loaded from the PSTAR files generated from the RVS Surfmet system. BODC were advised by the data processors that the file 'olg.master' was appended with the data each day of the cruise, with the exception of the last day's data and this data was loaded from the daily file 'olg.21837'. At BODC after loading the 'olg.master' and 'olg.21837' files and screening the input, data from 10/10/2008 was found to be missing and was subsequently loaded from the daily file 'olg.21808'.

Screening

Each data channel was inspected on a graphics workstation using BODC screening software EDSERPLO and any spikes or periods of dubious data were flagged using BODC quality control flag system ('M' for suspect value). Impossible values were checked carefully and flagged null only if believed to be genuine missing or bad data. EDSERPLO 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.

Calibrations

No sample or manufacturers calibrations were applied to the meteorological data.


Project Information

Oceans 2025 Theme 10, Sustained Observation Activity 1: The Atlantic Meridional Transect (AMT)

The Atlantic Meridional Transect has been operational since 1995 and through the Oceans 2025 programme secures funding for a further five cruises during the period 2007-2012. The AMT programme began in 1995 utilising the passage of the RRS James Clark Ross between the UK and the Falkland Islands southwards in September and northwards in April each year. Prior to Oceans 2025 the AMT programme has completed 18 cruises following this transect in the Atlantic Ocean. This sustained observing system aims to provide basin-scale understanding of the distribution of planktonic communities, their nutrient turnover and biogenic export in the context of hydrographic and biogeochemical provinces of the North and South Atlantic Oceans.

The Atlantic Meridional Transect Programme is an open ocean in situ observing system that will:

The specific objectives are:

The measurements taken and experiments carried out on the AMT cruises will be closely linked to Themes 2 and 5. The planned cruise track also allows for the AMT data to be used in providing spatial context to the Sustained Observation Activities at the Porcupine Abyssal Plain Ocean Observatory (SO2) and the Western Channel Observatory (SO10).

More detailed information on this Work Package is available at pages 6 - 9 of the official Oceans 2025 Theme 10 document: Oceans 2025 Theme 10

Weblink: http://www.oceans2025.org/


Data Activity or Cruise Information

Cruise

Cruise Name JR20081003 (AMT18, JR218)
Departure Date 2008-10-03
Arrival Date 2008-11-10
Principal Scientist(s)E Malcolm S Woodward (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