Metadata Report for BODC Series Reference Number 1083405

Metadata Summary

Data Description

Data Category Fluorescence or pigments
Instrument Type
WETLabs ECO-FLNTU combined fluorometer and turbidity sensor  fluorometers; optical backscatter sensors
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Mrs Sue Hartman
Originating Organization National Oceanography Centre, Southampton
Processing Status banked
Project(s) Oceans 2025

Data Identifiers

Originator's Identifier PAP1_062007_CHL_270
BODC Series Reference 1083405

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2007-06-22 16:02
End Time (yyyy-mm-dd hh:mm) 2007-08-09 07:03
Nominal Cycle Interval 1.0 seconds

Spatial Co-ordinates

Latitude 49.00000 N ( 49° 0.0' N )
Longitude 16.41900 W ( 16° 25.1' W )
Positional Uncertainty Unspecified
Minimum Sensor Depth 30.0 m
Maximum Sensor Depth 30.0 m
Minimum Sensor Height 4970.0 m
Maximum Sensor Height 4970.0 m
Sea Floor Depth 5000.0 m
Sensor Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor Depth Datum Approximate - Depth is only approximate
Sea Floor Depth Datum Unspecified -


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)
ACYCAA01 1 Dimensionless Record_No Sequence number
CPHLPS01 1 Milligrams per cubic metre chl-a_water_ISfluor_sampcal Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >unknown phase] by in-situ chlorophyll fluorometer and calibration against sample data
PRSTPR01 1 Decibars MidWat_TotPress Pressure (measured variable) exerted by the water body plus atmosphere by semi-fixed in-situ pressure 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

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

WETLabs ECO FLNTU fluorescence and turbidity sensor

The Environmental Characterization Optics (ECO) Fluorometer and Turbidity (FLNTU) sensor is a dual wavelength, single-angle instrument that simultaneously determines chlorophyll fluorescence and turbidity. It is easily integrated in CTD packages and provides a reliable turbidity measurement that is not affected by Colored Dissolved Organic Matter (CDOM) concentration.

The FLNTU can operate continuously or periodically and has two different types of connectors to output the data. There are 5 other models that operate the same way as this instrument but have slight differences, as stated below:


Temperature range 0 to 30°C
Depth rating

600 m (standard)

6000 m (deep)

Wavelength 700 nm
Sensitivity 0.01 NTU
Typical range 0.01 to 25 NTU
Wavelength 470 nm (excitation), 695 nm (emission)
Sensitivity 0.01 µg L -1
Typical range 0.01 to 50 µg L -1
Linearity 99% R 2

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


The following information and further details are available from the WETlabs website:

The WETlabs ECO FL-NTUSB sensor measures fluorescence to determine the chlorophyll content and optical scattering at 700 nm for simultaneous determination of turbidity in the water column. It is a dual-wavelength, single-angle sensor.

Sensor specifications

WETlabs ECO FL-NTUSB Sensor: Originator's Processing Notes

Deployed at mooring PAP2007JUN01

Data collected at PAP Observatory at 49.00 degrees N 16.419 degrees W
Deployment between 22-Jun-2007 and 09-Aug-2007
File created on : 17-Jun-2008

Sensor : WETlabs ECO FL-NTUSB Sensor
measures fluorescence to determine the chlorophyll content and optical scattering at 700 nm for simultaneous determination of turbidity in the water column. It is a dual-wavelength, single-angle sensor. There is also a pressure sensor housed in the instrument.

Deployed during cruise : RV Celtic Explorer CE0716
Recovered during cruise : RV Pelagia PE275

Sensor deployed in frame at the nominal depth of 30m

Originator's notes on deployment from the cruise report:

The Wetlabs fluorometer (Serial number FLNTUSB-270 (PAP 2007)) was set-up to run continuously first of all. This was because it was going to be clamped to the CTD frame for a calibration dip. This dip was station number 0716_002 and was completed successfully. Originally there were some worries about the pressure sensor on the fluorometer as when we plotted up the data using the calibration equation provided (Pressure = (Output x 0.059) + - 21.35), there were some definite errors. We got around this by producing our own calibration equation by plotting the pressure data from the CTD's bottle stops against the pressure data from the fluorometer's pressure sensor. After doing this we were able to get a decent profile of chlorophyll within the water column for this calibration dip with a relatively shallow and broad DCM peaking at ~ 20 m. Once this was shown to be working, the fluorometer setup was changed to sample for 20 seconds every two hours on the even hours GMT, just like for the ISUS. This was confirmed by keeping it attached to a laptop for a few hours after start up to see if the sampling took place. When this was confirmed, it was successfully fitted to the mooring frame and the mooring was deployed during cruise CE0716 on the 22nd June 2007, on the PAP7 mooring.

Data Format

The data in the file are :-
temperature (Celsius)
temperature quality
conductivity (mS/cm)
conductivity quality
pressure (dbar)
pressure quality
salinity (PSU)
salinity quality
chlorophyll-a (µg/l) with both manufacturer's scaling factors and calibration dip corrections applied
chlorophyll-a quality
chlorophyll-a (µg/l) with only manufacturer's scaling factors applied
chlorophyll-a quality

Scaling and Calibration

The WETlabs fluorometer sensor output is adjusted in two stages; firstly by using calibration coefficients for that sensor supplied by the manufacturer.
The formula used is:

Corrected Fluorometer Output (µg/l) = Scale Factor * (Unit Output - Clean Water Offset)
The manufacturer's coefficients were Clean Water Offset = 55, Scale Factor = 0.0121

Secondly, the fluorometer output is calibrated using factors calculated from either a pre- or post-deployment dip at the mooring site.
The following formula is used:

Chlorophyll-a (µg/l) = (Calibration Slope * Corrected Fluorometer Output) + Calibration Intercept
Where Calibration Slope = 0.63 and Intercept = 0.0123

The WETlabs pressure sensor was calibrated by the manufacturer using the following equation and coefficients:

Pressure (dBars) = (Output * Slope) + Intercept
Where Slope = 0.059 dBar/count and Intercept= -21.35 counts

WETlabs FL-NTUSB sensor BODC processing

The data were supplied to BODC in .csv format. These were reformatted to the internal BODC NetCDF format. The following table shows how the variables in the .csv file were mapped to appropriate BODC parameter codes:

Originator's Variable Units Description BODC Parameter Code Units Comment
year, month, day year, month, day Date (time from 00:00 01/01/1760 to 00:00 UT on day) AADYAA01 days -
minutes, second minutes, second Time (time between 00:00 UT and timestamp) AAFDZZ01 days -
Pressure Decibars Pressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected to read zero at sea level. PRESPR01 Decibars Originator's flagging included in transfer.
WETlabs fluorometer µg/l Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate phase] by in-situ chlorophyll fluorometer and manufacturer's calibration applied CPHLPM01 Milligrams per cubic metre Manufacturer's and pre-deployment on-site calibration applied.


The reformatted data were visualised using the in-house visualistation software. Suspect data were marked by adding an appropriate quality control flag. Where data were missing an appropriate absent data value has beenn used with a corresponding flag.

Project Information

Oceans 2025 - The NERC Marine Centres' Strategic Research Programme 2007-2012

Who funds the programme?

The Natural Environment Research Council (NERC) funds the Oceans 2025 programme, which was originally planned in the context of NERC's 2002-2007 strategy and later realigned to NERC's subsequent strategy (Next Generation Science for Planet Earth; NERC 2007).

Who is involved in the programme?

The Oceans 2025 programme was designed by and is to be implemented through seven leading UK marine centres. The marine centres work together in coordination and are also supported by cooperation and input from government bodies, universities and other partners. The seven marine centres are:

Oceans2025 provides funding to three national marine facilities, which provide services to the wider UK marine community, in addition to the Oceans 2025 community. These facilities are:

The NERC-run Strategic Ocean Funding Initiative (SOFI) provides additional support to the programme by funding additional research projects and studentships that closely complement the Oceans 2025 programme, primarily through universities.

What is the programme about?

Oceans 2025 sets out to address some key challenges that face the UK as a result of a changing marine environment. The research funded through the programme sets out to increase understanding of the size, nature and impacts of these changes, with the aim to:

In order to address these aims there are nine science themes supported by the Oceans 2025 programme:

In the original programme proposal there was a theme on health and human impacts (Theme 7). The elements of this Theme have subsequently been included in Themes 3 and 9.

When is the programme active?

The programme started in April 2007 with funding for 5 years.

Brief summary of the programme fieldwork/data

Programme fieldwork and data collection are to be achieved through:

The data is to be fed into models for validation and future projections. Greater detail can be found in the Theme documents.

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2007-06-22
End Date (yyyy-mm-dd) 2007-09-05
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierPAP1_062007
Platform Categorysubsurface mooring

Moored Instrument Rig PAP1_062007

This rig was deployed as part of the Porcupine Abyssal Plain (PAP) observatory project. 'PAP1_062007' refers to the deployment of mooring number 1 in June 2007 ('062007') located at the PAP Observatory. This was the seventh deployment of this mooring configuration at the PAP site, under this project.

Data summary

Deployment cruise RV Celtic Explorer CE0716
Recovery cruise RV Pelagia PE275


The mooring design is an 'S' tether configuration allowing the mooring to better withstand the extremes of the environment it is in. The main surface buoy is a Toroid type buoy, and below this buoy are 30 meters of chain with a conducting cable running along side. The chain is there to take the loads that the mooring will experience and the cable is a vehicle for the data. Attached to the bottom of the chain is the instrument frame, within which are five different instruments, and coming out of the bottom of the frame is a 10mm jacketed wire, 1000 meters long. Along the wire, at pre-determined points, there are eleven SBE 37 CTDs, all of which have built in modems allowing their data to be part of the telemetry system.

Instrument Serial number Nominal depth
Envirotech NAS-3X nutrient analyzer Unknown 30m
MBARI ISUS nitrate sensor Unknown 30m
SAMI Carbon Dioxide sensor Unknown 30m
Wetlabs fluorometer FLNTUSB-270 30m
Sea-Bird SBE 37 CTD SN 4465 ID40 30m
Sea-Bird SBE 37 CTD SN 4463 ID41 45m
Sea-Bird SBE 37 CTD SN 3280 ID42 60m
Sea-Bird SBE 37 CTD SN 4798 ID43 75m
Sea-Bird SBE 37 CTD SN 3279 ID44 90m
Sea-Bird SBE 37 CTD SN 3889 ID45 110m
Sea-Bird SBE 37 CTD SN 4460 ID46 130m
Sea-Bird SBE 37 CTD SN 4069 ID47 150m
Sea-Bird SBE 37 CTD SN 4063 ID48 200m
Sea-Bird SBE 37 CTD SN 3795 ID49 250m
Sea-Bird SBE 37 CTD SN 4061 ID50 300m
Sea-Bird SBE 37 CTD SN 4073 ID51 1000m

Other Series linked to this Data Activity - 1225828 1225853 1225841 1058137 1225816 1225865 1225877 1225889 1225908 1225804 1225933 1225890 1225921


Cruise Name CE0716
Departure Date 2007-06-19
Arrival Date 2007-06-25
Principal Scientist(s)Richard Stephen Lampitt (National Oceanography Centre, Southampton)
Ship Celtic Explorer

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Station NamePorcupine Abyssal Plain (PAP)
CategoryOffshore location
Latitude49° 0.00' N
Longitude16° 30.00' W
Water depth below MSL4800.0 m

Porcupine Abyssal Plain (PAP) Observatory

The Porcupine Abyssal Plain (PAP) observatory is a site at which moorings were deployed in the Northeastern Atlantic, as part of the ANIMATE (Atlantic Network of Interdisciplinary Moorings and Time-series for Europe), MERSEA (Marine Environment and Security for the European Area) and then EuroSITES projects. The PAP site is centred at latitude 49° N and longitude 16.5° W. Moorings have occupied this region since 2002 and are typically deployed for 12 months.

Data summary

Mooring deployment Temperature salinity pressure ADCP Chlorophyll Sediment trap Current meter Nitrate Carbon dioxide Oxygen Irradience
Real time Delayed mode Real time Delayed mode Real time Delayed mode Real time Delayed mode Real time Delayed mode Real time Delayed mode Real time Delayed mode
PAP1 Oct 2002-Jun 2003 Data Data Data NT UD Data - Data NT Data NT SF - - - -
PAP2 Jul 2003-Nov 2003 CF Data Data NT Data Data - Data NT Data NT Data - - - -
PAP3 Nov 2003-Jun 2004 Data Data Data NT Data Data - Data NT Data NT Data - - - -
PAP4 Jun 2004-Jul 2005 Data Data Data NT Data Data - Data NT UD NT Data - - - -
PAP5 Jul 2005-Jun 2006 Data Lost Lost NT Lost Data - Data NT Lost NT Lost - - - -
PAP6 Jul 2006-Jul 2007 ND ND ND ND ND Data - Data ND ND ND ND - - - -
PAP7 Jun 2007-Aug 2007 Data Lost ND Data Data NYR - NYR SF SF NT Data - - - -
PAP 200905 May 2009-Jul 2009 Data Data - Data Data - - - Data Data SF SF - Data - -
PAP 201005 May 2010- Data - - Data - - Data - Data - Data - Data - Data -

Status Indicators

Indicator Description
Data Data received from mooring
Lost Data not received
SF Sensor failed
ND Not deployed
NYR Not yet recovered
CF Communications failure
UD Unusable data
NT Not telemetered

Other Series linked to this Fixed Station for this cruise - 888088 888107 888119 888120 888132 888144 888156 888168 888181 888193 888200 945170 1058137 1225804 1225816 1225828 1225841 1225853 1225865 1225877 1225889 1225890 1225908 1225921 1225933

Other Cruises linked to this Fixed Station (with the number of series) - CD158 (13) D266 (11) D341 (35) JC034T (4) JC071 (2) JC085 (9) M108 (1) PO300_1 (12) PO306 (14)

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