Metadata Report for BODC Series Reference Number 1058137

Metadata Summary

Data Description

Data Category Water column chemistry
Instrument Type
Sunburst Submersible Autonomous Moored Instrument Carbon Dioxide Sensor  dissolved gas sensors
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Mrs Sue Hartman
Originating Organization National Oceanography Centre, Southampton
Processing Status banked
Project(s) Porcupine Abyssal Plain (PAP)

Data Identifiers

Originator's Identifier PAP1_062007_PCO2_35
BODC Series Reference 1058137

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2007-06-28 15:00
End Time (yyyy-mm-dd hh:mm) 2007-08-08 23:00
Nominal Cycle Interval 7200.0 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 4811.0 m
Maximum Sensor Height 4811.0 m
Sea Floor Depth 4841.0 m
Sensor Distribution Sensor fixed, measurements made at fixed depths - The sensor is at a fixed depth, but measurements are made remotely from the sensor over a range of depths (e.g. ADCP measurements)
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
ADEPZZ01 1 Metres DepBelowSurf Depth below surface of the water body
PCO2SS01 1 Microatmospheres pCO2 Partial pressure of carbon dioxide {CO2 CAS 124-38-9} {pCO2} in the water body by spectrophotometric absorbance at two different wavelengths of CO2-equilibrated fixed alkalinity dye solution
TEMPPR01 1 Degrees Celsius Temp Temperature of the water body

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

Sunburst Sensors SAMI2-CO2 sensor

The SAMI 2 -CO 2 sensor measures the partial pressure of carbon dioxide ( p CO 2 ) in water using a reagent-based colorimetric sensor. The instrument also includes a thermistor for concurrent temperature measurements.

This instrument can be deployed on a mooring for long-term monitoring applications. It has a deployment life of one year if the sampling period is set to one hour. Shipboard configurations are also available.


Duration approx. 9000 measurements
Response time approx. 5 minutes
Depth rating 0 to 500 m
p CO 2 range 150 to 700 ppm
p CO 2 precision < 1 ppm
p CO 2 accuracy ± 3 ppm
p CO 2 long-term drift < 1 ppm over 6 months
Temperature range -2 to 40°C
Temperature precision ± 0.01°C
Temperature accuracy 0.1°C

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

Sunburst SAMI-CO2 100 sensor

The SAMI (submersible autonomous moored instrument) 100 measures the partial pressure of carbon dioxide (pCO 2 ) in the water column by spectrophotometric absorbance at two different wavelengths of a CO 2 -equilibrated fixed alkalinity dye solution.

The SAMI-CO 2 is a reagent based precision instrument used in oceanographic and freshwater studies of pCO 2 . It has been used since 1999.

Sensor specifications

PAP SAMI-CO2 Originator's processing notes


Data collected at PAP Observatory at 49.063 degrees N 16.402 degrees W
Deployment between 22-Jun-2007 and 05-Sep-2007
File created on : 05-Aug-2008

Sensor : Sunburst Sensors LLC, SAMI Carbon Dioxide sensor Serial-No : 35
Measuring partial pressure of carbon dioxide pCO 2 in the water column by spectrophotometric absorbance at two different wavelengths of CO 2 -equilibrated fixed alkalinity dye solution

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

Sensor deployed in frame at the nominal depth of 30m

Data Format

The data in the files are :-
Partial pressure of Carbon Dioxide (micro atmospheres)
Partial pressure of Carbon Dioxide quality control marker
SAMI Temperature sensor (°C)
SAMI Temperature sensor quality control marker

Coefficients for PAP2007JUN01 Mooring 1

Calculated incorporating laboratory calibration factors:

coeff_a: 0.76842
coeff_b: 2.9366
coeff_c: 2.9366
Temperature calibration

The formulae used are:

Partial pressure of Carbon Dioxide = 10 ^((-coeff_b + sqrt((coeff_b 2 ) - (4*coeff_a*(coeff_c -Tcorr)))) / (2*coeff_a));
where Tcorr = ((temperature-calib_T)*(-1*T_coeff)) + R_CO2
and T_coeff = -0.0075778 - R_CO2 * -0.0012389 - (R_CO2 2 ) * -0.00048757
R_CO2 = -1 * log10(((abs_620/abs_434)-0.0043) / (2.136 - (0.2105 *abs_620/abs_434)))
abs_620 = -1 * log10(s_620/(k_620*s_740))
abs_434 = -1 * log10(s_434/(k_434*s_740))
where s_434, s_620, s_740 are the respective digital counts at these wavelengths
and k_434 = s_434/s_740 when blank measurement taken
and k_620 = s_620/s_740 when blank measurement taken

Project Information

Porcupine Abyssal Plain (PAP) Observatory

Scientific Rationale

During the past decade, the intention has been to observe changes in rate and state variables within the entire water column and benthos, for a wide range of biogeochemically significant features in the centre of the Porcupine Abyssal Plain. The site appears to satisfy many of the conditions for simplicity; it lies well away from regions where physical gradients are strong and is in the middle of one of the biogeochemical provinces. The seabed is very flat over large areas (4800m depth) and there is no evidence of significant advective supply of material. Below the upper mixed layer, currents are generally northerly and of low velocity. The depth of winter mixing is large and variable (300-800m) and this facilitates research into the effects of the most important driving force on upper ocean biogeochemistry: nutrient supply. There is a substantial data base from previous programs on which to build: the PAP site is about 350Km to the northeast of the site of the JGOFS North Atlantic Bloom Experiment in 1989 (see Deep Sea Research volume 40 1-2) and the continuing work by IFM, Kiel. It was the focus of the EU BENGAL program from 1998-2001 (See Progress in Oceanography volume 50 1-4) and is at the northern boundary of the French POMME program. Ships of opportunity contribute significantly with frequent transects by the Continuous Plankton Recorder since 1949 and PCO2 transects under the EU program CAVASSOO. It was a focus of the then SOC Deacon Divison core research program BICEP which draws the link between upper ocean processes and the deep ocean benthos where there has been a major biological regime shift in the mid 1990's.

At the beginning of the project in 2002, three moorings were deployed at the PAP site with the intention of recovering and redeploying each of them annually.

The three moorings deployed comprised the following:


Billett, D.S.M., Bett B.J., Reid, W.D.K., Boorman, B. and Priede, M. Long-term change in the abyssal NE Atlantic: The 'Amperima Event' revisited. Deep Sea Research II; PAP special volume (Submitted)

Hartman. S., Larkin. K. E., Lampitt, R. S, Koeve, W., Yool, A., Körtzinger, A., Hydes, D.J. (This volume) Seasonal and inter-annual biogeochemical variations at PAP (49°N, 16.5°W) 2003-2005. Deep Sea Research II; PAP special volume (Submitted)

Gooday, A et al. Long term change in foraminiferans Deep Sea Research II, PAP special volume (Submitted)

Martin, A.P., Lucas, M.I., Painter, S.C., Pidcock, R., Prandke H., Prandke,H., Stinchcombe, M.C. (2008) The supply of nutrients due to vertical turbulent mixing: a study at the Porcupine Abyssal Plain study site (49°50'N 16°30'W) in the northeast Atlantic. Deep Sea Research II, PAP special volume (Submitted)

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 1225816 1225865 1225877 1225889 1225908 1225804 1225933 1083405 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 1083405 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