Metadata Report for BODC Series Reference Number 1222437
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
Data Access Policy
Public domain data
These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.
The recommended acknowledgment is
"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."
Narrative Documents
TriOS RAMSES-ACC-UV radiometer
Basic Information
This is a spectral radiometer measuring over the UV band range (280-500 nm) with a cosine-response to measure irradiance. It is fitted with a 256 channel silicon photodiode array with channels giving 2.2 nm/pixel and a spectral accuracy of 02 nm. Typical saturation (4ms integration time) is 20 W m-2 nm-1 sr-1 (at 300 nm), 17 W m-2 nm-1 sr -1 (at 360nm), 18W m-2 nm-1 sr -1 (at 500nm). Typical NEI (8ms integration time) is 0.85 µW m-2 nm-1 sr -1 (at 300nm), 0.75 µW m-2 nm-1 sr -1 (at 360nm), 0.80 µW m-2 nm-1 sr -1 (at 500nm). Acuuracy is quoted as being better than 6-10 per cent depending on spectral range.
Performance Specifications
Optics
| wavelength range* | 280 - 500 nm |
|---|---|
| detector type* | 256 channel silicon photodiode array |
| spectral sampling*: | 2.2 nm/pixel |
| spectral accuracy: | 0.2 nm |
| usable channels: | 100 |
| typical saturation (4ms integration time): | 20 W m-2 nm-1 sr-1 (at 300nm) |
| 17 W m-2 nm-1 sr-1 (at 360nm) | |
| 18 W m-2 nm-1 sr-1 (at 500nm) | |
| typical NEI (8ms integration time): | 0.85 µW m-2 nm-1 sr-1 (at 300nm) |
| 0.75 µW m-2 nm-1 sr-1 (at 360nm) | |
| 0.80 µW m-2 nm-1 sr-1 (at 500nm) |
Detection
| collector type: | cosine response |
|---|---|
| accuracy: | better than 6-10% (depending on spectral range) |
Electrical
| integration time: | 4 ms - 8 sec (user selectable or auto [4 ms - 4096 ms]) |
|---|---|
| telemetry data interface: | RS232 or Serial Bus |
| data rate (RS232): | 1,200 - 19,200 baud |
| power requirements: | 1.5 - 11 VDC |
| 0.85mW (data acquisition active) | |
| 100mW (interface active) | |
| 0.5mW (stand-by modus) | |
| connector: | SubConn micro 5 pin male |
Physical
| size: | dia. 4.83 cm x 26 cm (without connector) |
|---|---|
| weight in air: | <1.0 kg (stainless steel / POM housing) |
| depth range: | 300m |
| operating temperature: | -10°C to +50°C |
* specifications from Carl ZEISS, Germany
Further information may be found in the TriOS RAMSES brochure.
AMT22 RRS James Cook (JC079) Surface UV Instrumentation
| Instrument | Serial number | Parameter |
|---|---|---|
| Trios Rameses ACC UV | Not supplied | UVA and UVB |
AMT22 RRS James Cook (JC079) Surface UV Measurements Processing Document
Originator's Processing
A Trios Rameses ACC UV sensor was set up high on the ship's starboard winch control cabin and configured to log hyperspectral UV between 200 and 500 nm at 2.5nm resolutuion every 5 minutes through daylight hours. The data can either be kept at hyperspectral or integrated over broadband (UV-A and UV-B) ranges.
The data were fully calibarated by a calibration carried out by TRIOS in May 2011. The data were split into the UVA and UVB components using the idl rouitine trios_uv_deck.pro where UVA and UVB were defined as 320< λ <380 nm and 280< λ <320 nm respectively. The data were subsequently placed into daily files.
Investigations have found that the calibration of the instruments drifts dramatically during cruises. The data have not been corrected for this drift.
Data were submitted to BODC as text files with each individual file name dusing the convention yymmdd_uva_uvb.txt as each file represented a a day of UV measurement on the cruise.
BODC Processing
The data were received and archived to the BODC system. Due to the lack of longitude and latitude in the originator's files the underway latitude and longitude in the BODC bank were concatenated with the UV files. The data were then transferred to the BODC format and loaded to the databse. databse.
Parameters
Parameter codes defined in the BODC parameter dictionary were assigned to the variables as shown in the table below:
| Originator's Parameter | Originator's Units | BODC Parameter Code | BODC Parameter Units | BODC Description |
| UVA | W/(m^2) | VSRAUVAW | Watts per square metre | Downwelling vector irradiance as energy (ultra-violet A wavelengths) in the atmosphere by cosine-collector radiometer |
| UVB | W/(m^2) | VSRAUVBW | Watts per square metre | Downwelling vector irradiance as energy (ultra-violet B wavelengths) in the atmosphere by cosine-collector radiometer |
| N/A | N/A | ALATGP01 | Degrees | Latitude north (WGS84) by unspecified GPS system |
| N/A | N/A | ALONGP01 | Degrees | Longitude east (WGS84) by unspecified GPS system |
Screening
All the data on 10/10/2012 were flagged 'M' as the values were considerably lower than the data on subsequent dates at the equivalent times. In addition to this no diurnal signal could be seen.
The rest of the data appears to have a strong diurnal signal with a few spikes which have been left unflagged as they are considered to be within the realms of possibility.
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 |
