Metadata Report for BODC Series Reference Number 1363905

Metadata Summary

Data Description

Data Category Meteorology -unspecified
Instrument Type
TriOS RAMSES ACC-UV Hyperspectral UVA and UVB Radiometer  radiometers
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Dr Tim Smyth
Originating Organization Plymouth Marine Laboratory
Processing Status banked
Online delivery of data Download available - Ocean Data View (ODV) format
Project(s) Oceans 2025 Theme 10 SO1:AMT

Data Identifiers

Originator's Identifier UV_LATLON_101018
BODC Series Reference 1363905

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-10-18 00:02
End Time (yyyy-mm-dd hh:mm) 2010-10-18 19:57
Nominal Cycle Interval 300.0 seconds

Spatial Co-ordinates

Start Latitude 41.60580 N ( 41° 36.3' N )
End Latitude 39.45100 N ( 39° 27.1' N )
Start Longitude 22.97750 W ( 22° 58.7' W )
End Longitude 24.73010 W ( 24° 43.8' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth -15.0 m
Maximum Sensor or Sampling Depth -15.0 m
Minimum Sensor or Sampling Height -
Maximum Sensor or Sampling Height -
Sea Floor Depth -
Sea Floor Depth Source -
Sensor or Sampling Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor or Sampling Depth Datum Approximate - Depth is only approximate
Sea Floor Depth Datum -


BODC CODERankUnitsTitle
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
ACYCAA011DimensionlessSequence number
ALATGP011DegreesLatitude north relative to WGS84 by unspecified GPS system
ALONGP011DegreesLongitude east relative to WGS84 by unspecified GPS system
VSRAUVAW1Watts per square metreDownwelling vector irradiance as energy of electromagnetic radiation (ultra-violet A wavelengths) in the atmosphere by cosine-collector radiometer
VSRAUVBW1Watts per square metreDownwelling vector irradiance as energy of electromagnetic radiation (ultra-violet B wavelengths) in the atmosphere by cosine-collector radiometer

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

AMT20 RRS James Cook (JC053) Surface UV Measurements Data Quality Report

The data were calibrated using a calibration carried out by Trios in March 2010.

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

AMT20 RRS James Cook (JC053) Surface UV Instrumentation

Instrument Serial number Parameter
Trios Rameses ACC UV SAM_81a2 UVA and UVB

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


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)


collector type: cosine response
accuracy: better than 6-10% (depending on spectral range)


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


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.

AMT20 RRS James Cook (JC053) Surface UV Measurements Processing Document

Originator's Processing

The UV hyperspectral measurements were taken on the superstructure of the RRS James Cook during the AMT20 cruise. The measurements were taken every 5 minutes during daylight hours for the duration of the cruise. The nominal wavelength for the hyperspectral data (raw data) is around 2 nm, but varies.

Investigations have found that the calibration of these instruments drifts dramatically during cruises. These data have not been corrected for this drift. The originator suggests that a comparison with modelled data is made to correct for this.

Using the idl routine the hyperspectral data from the raw files were split into UVA and UVB components and put into daily files with the naming convention yymmdd_uva_uvb.txt (where yymmdd is year month and day). The first column is time (GMT), the second and the third columns are UVA and UVB respectively. These text files were subsequently submitted to BODC alongside the raw (hyperspectral data) .dat files.

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 concatenated data were then transferred to the BODC format and loaded to the database. Data that occurred outside the cruise dates (i.e. before 12th October 2010) were not concatenated due to lack of underway data and were subsequently not loaded.


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
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
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


The data were screened using the BODC in-house software, Edserplo, and no flags were applied.

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


Data Activity or Cruise Information


Cruise Name JC053 (AMT20)
Departure Date 2010-10-12
Arrival Date 2010-11-25
Principal Scientist(s)Andrew Rees (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
Q value below limit of quantification