Metadata Report for BODC Series Reference Number 1760672
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
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:
- Manufacturer: Vaisala
- Type: Silicon capacitive sensor
- Model: PTB210
- Range: 900 - 1100 hPa
- Output: 0-5VDC
- Total Accuracy (20°C): ±0.30hPa
- Operating temperature: -40 to +60 deg C
- Weight: 110g
- Certification Ingress Protection: IP65
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 |
| 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:
- give early warning of any fundamental change in Atlantic ecosystem functionng
- improve forecasts of the future ocean state and associated socio-economic impacts
- provide a "contextual" logistical and scientific infrastructure for independently-funded national and international open ocean biogeochemical and ecological research.
The specific objectives are:
- To collect hydrographic, chemical, ecological and optical data on transects between the UK and the Falkland Islands
- To quantify the nature and causes of ecological and biogeochemical variability in planktonic ecosystems
- To assess the effects of variability in planktonic ecosystems on biogenic export and on air-sea exchange of radiatively active gases
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 |
| B | nominal value |
| Q | value below limit of quantification |
