Metadata Report for BODC Series Reference Number 1268122

Metadata Summary

Data Description

Data Category Offshore sea floor pressure series
Instrument Type
Sea-Bird SBE 26 SEAGAUGE Wave and Tide Recorder  wave recorders; sea level recorders; water temperature sensor
Instrument Mounting fixed benthic node
Originating Country United Kingdom
Originator Dr Stuart Cunningham
Originating Organization National Oceanography Centre, Southampton
Processing Status banked
Project(s) RAPIDMOC

Data Identifiers

Originator's Identifier 8EBH1L8/397
BODC Series Reference 1268122

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2011-10-07 07:01
End Time (yyyy-mm-dd hh:mm) 2014-05-29 04:31
Nominal Cycle Interval 1800.0 seconds

Spatial Co-ordinates

Latitude 27.13533 N ( 27° 8.1' N )
Longitude 15.36420 W ( 15° 21.9' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth 3018.0 m
Maximum Sensor Depth 3018.0 m
Minimum Sensor Height -13.0 m
Maximum Sensor Height -13.0 m
Sea Floor Depth 3005.0 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 Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface


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
PRSTDR01 1 Decibars DriftCorrTotPress Pressure (measured variable) exerted by the water body plus atmosphere by fixed in-situ pressure sensor and correction for drift
PRSTPS01 1 Decibars TotPressSeaFL Pressure (measured variable) exerted by the water body plus atmosphere by fixed in-situ pressure sensor
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

Sea-Bird SBE-26 SEAGAUGE Wave and Tide Recorder

The SEAGAUGE SBE 26 is a wave & tide recorder manufactured by Sea-Bird Electronics ( ) which integrates water level measurements and characterizes waves with interleaved bursts of sampling at up to 4 Hz. The SBE 26 combines a Digiquartz pressure sensor, accurate clock, precision thermometer and optional conductivity sensor.

The SEAGAUGE SBE 26 continuously integrates pressure samples to obtain water level measurements unaffected by wave action, and also independently burst-samples pressure at rates up to 4 Hz for wave amplitude calculation. Water level integration and wave burst sampling intervals are programmable. The large memory permits frequent water level recording and detailed wave characterization.



Measurement range 0 to 21 m
Accuracy 0.01% FS (3 mm)
Repeatability 0.005% (1.5 mm)
Hysteresis 0.005% (1.5 mm)
Tide resolution 0.2 mm with 1 mn integration
0.01 mm with 15 mn integration
Wave resolution 0.4 mm with 0.26 sec integration
0.1 mm with 1 sec integration
Calibration 0 psia to full scale pressure (45 psia)

Temperature [°C]

Measurement range -5 to +35
Accuracy 0.02
Resolution 0.01
Calibration -1 to +31

Sea-Bird software processing

Default data processing is carried out using the manufacturer's software package ('SEASOFT for Waves') which performs auto-spectrum and time-series analyses and provides facilities for deployment planning, instrument set- up, data retrieval and plotting.

RAPIDMOC Calibration Coefficients

Instrument Serial number 0397
Deployment cruise JC064
Recovery cruise JC103

Processing Log

Clock offset at recovery of 668 s (relative to UTC)

purge_bp_003.m: Pressure offset of 3005.44 dbar NOT removed
purge_bp_003.m: Operation interval: 07-Oct-2011 06:29:41 to 29-May-2014 04:48:51
purge_bp_003.m: Linear interpolation with sampling rate 48 per day

Exponential-linear pressure fit to be stored with data:
amplitude of exponential decay: -0.022135 db
time-constant of exponential decay: 42.972983 days
linear slope: -0.000082 db/day
mean offset: 3060.115508 db

RAPIDMOC/MOCHA Sea-Bird SEAGAUGE data processing document

This document outlines the procedures undertaken to process and quality assure the SEAGAUGE data collected under the RAPIDMOC and MOCHA projects.

Originator's processing

The raw data are downloaded from the instrument and converted to ASCII format. All processing is performed in Matlab.


Processing steps which are undertaken include

Quality control

All variables in specified time intervals can be set to dummy values if the data are suspicious. Any data deemed as suspicious, i.e. a spike, are removed.

BODC processing

Data are received after quality checks have been made and calibrations have been applied by the originator. The data files are submitted in ASCII format.

Once the submitted data files are safely archived, the data undergo reformatting and banking procedures:

Parameter mapping

The following describes the parameters contained in the originator's files and their mapping to BODC parameter codes :

Identifier Unit Definition BODC parameter code Units Unit conversion Comments
YY year Year AADYAA01 days - Combined with MM and DD to form a date and transferred
MM month Month AADYAA01 days - Combined with MM and DD to form a date and transferred
DD day Day AADYAA01 days - Combined with MM and DD to form a date and transferred
HH hour Decimal hours AAFDZZ01 days /24 Transferred
P decibars Pressure PRSTPS01 decibars - Transferred
T °C Temperature (IPTS-90) TEMPPR01 °C - Transferred
PFIT decibars Exponential-linear or pure linear trend of pressure (decibars). - - - See parameter derivation table below

Parameter derivation

The following describes the parameters derived by BODC and their mapping to BODC parameter codes:

BODC parameter code Units Identifier Definition Units Equation Comments
PRSTDR01 decibars P

Exponential-linear or pure linear trend of pressure.

P-PFIT pressure series that is de-trended and unfiltered i.e. still contains tides

Project Information

Monitoring the Meridional Overturning Circulation at 26.5N (RAPIDMOC)

Scientific Rationale

There is a northward transport of heat throughout the Atlantic, reaching a maximum of 1.3PW (25% of the global heat flux) around 24.5°N. The heat transport is a balance of the northward flux of a warm Gulf Stream, and a southward flux of cooler thermocline and cold North Atlantic Deep Water that is known as the meridional overturning circulation (MOC). As a consequence of the MOC northwest Europe enjoys a mild climate for its latitude: however abrupt rearrangement of the Atlantic Circulation has been shown in climate models and in palaeoclimate records to be responsible for a cooling of European climate of between 5-10°C. A principal objective of the RAPID programme is the development of a pre-operational prototype system that will continuously observe the strength and structure of the MOC. An initiative has been formed to fulfill this objective and consists of three interlinked projects:

The entire monitoring array system created by the three projects will be recovered and redeployed annually until 2008 under RAPID funding. From 2008 until 2014 the array will continue to be serviced annually under RAPID-WATCH funding.

The array will be focussed on three regions, the Eastern Boundary (EB), the Mid Atlantic Ridge (MAR) and the Western Boundary (WB). The geographical extent of these regions are as follows:


Baehr, J., Hirschi, J., Beismann, J.O. and Marotzke, J. (2004) Monitoring the meridional overturning circulation in the North Atlantic: A model-based array design study. Journal of Marine Research, Volume 62, No 3, pp 283-312.

Baringer, M.O'N. and Larsen, J.C. (2001) Sixteen years of Florida Current transport at 27N Geophysical Research Letters, Volume 28, No 16, pp3179-3182

Bryden, H.L., Johns, W.E. and Saunders, P.M. (2005) Deep Western Boundary Current East of Abaco: Mean structure and transport. Journal of Marine Research, Volume 63, No 1, pp 35-57.

Hirschi, J., Baehr, J., Marotzke J., Stark J., Cunningham S.A. and Beismann J.O. (2003) A monitoring design for the Atlantic meridional overturning circulation. Geophysical Research Letters, Volume 30, No 7, article number 1413 (DOI 10.1029/2002GL016776)

RAPID- Will the Atlantic Thermohaline Circulation Halt? (RAPID-WATCH)

RAPID-WATCH (2007-2014) is a continuation programme of the Natural Environment Research Council's (NERC) Rapid Climate Change (RAPID) programme. It aims to deliver a robust and scientifically credible assessment of the risk to the climate of UK and Europe arising from a rapid change in the Atlantic Meridional Overturning Circulation (MOC). The programme will also assess the need for a long-term observing system that could detect major MOC changes, narrow uncertainty in projections of future change, and possibly be the start of an 'early warning' prediction system.

The effort to design a system to continuously monitor the strength and structure of the North Atlantic MOC is being matched by comparative funding from the US National Science Foundation (NSF) for the existing collaborations started during RAPID for the observational arrays.

Scientific Objectives

This work will be carried out in collaboration with the Hadley Centre in the UK and through international partnerships.

Mooring Arrays

The RAPID-WATCH arrays are the existing 26°N MOC observing system array (RAPIDMOC) and the WAVE array that monitors the Deep Western Boundary Current. The data from these arrays will work towards meeting the first scientific objective.

The RAPIDMOC array consists of moorings focused in three geographical regions (sub-arrays) along 26.5° N: Eastern Boundary, Mid-Atlantic Ridge and Western Boundary. The Western Boundary sub-array has moorings managed by both the UK and US scientists. The other sub-arrays are solely led by the UK scientists. The lead PI is Dr Stuart Cunningham of the National Oceanography Centre, Southampton, UK.

The WAVE array consists of one line of moorings off Halifax, Nova Scotia. The line will be serviced in partnership with the Bedford Institute of Oceanography (BIO), Halifax, Canada. The lead PI is Dr Chris Hughes of the Proudman Oceanographic Laboratory, Liverpool, UK.

All arrays will be serviced (recovered and redeployed) either on an annual or biennial basis using Research Vessels from the UK, US and Canada.

Modelling Projects

The second scientific objective will be addressed through numerical modelling studies designed to answer four questions:

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2011-10-06
End Date (yyyy-mm-dd) 2014-05-29
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierEBH1L8_8
Platform Categoryfixed benthic node

RAPID Moored Instrument Rig EBH1L8_8

This rig was deployed as part of the Eastern Boundary (EB) array of the RAPIDMOC project.

Deployment cruise RRS James Cook cruise JC064
Recovery cruise RRS James Cook cruise JC103

The rig was anchored by a 300 kg anchor and kept erect by sub-surface floats attached along the mooring rope. The instruments were attached to a tripod assembly.

Instruments deployed on the rig

Depth Instrument
3018 m Sea-Bird SBE26 SEAGUAGE Wave and Tide Recorder (#0396)
3018 m Sea-Bird SBE26 SEAGUAGE Wave and Tide Recorder (#0397)

Other Series linked to this Data Activity - 1268110


Cruise Name JC064
Departure Date 2011-09-10
Arrival Date 2011-10-09
Principal Scientist(s)Stuart A Cunningham (National Oceanography Centre, Southampton)
Ship RRS James Cook

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Station NameEastern Boundary Array
CategoryOffshore area
Latitude25° 51.60' N
Longitude18° 43.98' W
Water depth below MSL

RAPIDMOC Eastern Boundary (EB) Array

The Eastern Boundary Array defines a box in which moorings are deployed at the eastern side of the North Atlantic as part of the RAPIDMOC project. The box region has latitudinal limits of 23.5° N to 29° N and longitudinal limits of 12° W to 25.5° W. Moorings have occupied this region since 2004 and are typically deployed for 6 to 18 months.

Moored data summary

A description of the data types can be found at the bottom of this document.

Year Cruise ID Number of moorings Data types (number of instruments)
2004 D277, PO319 11 BPR (7), CM (10), MCTD (32)
2005 CD170,CD177 15 ADCP (1), BPR (4), CM (4), MCTD (71), IES (2), MMP (1)
2006 D304, PO343, PO345 24 BPR (6), CM (4), MCTD (78), MMP (1)
2007 D324 13 BPR (3), MCTD (53), IES (2)
2008 D334 14 BPR (3), CM (2), MCTD (44), IES (1)
2009 D344 14 BPR (4), CM (2), MCTD (44)
2011 D359, JC064 22 BPR (12), CM (18), MCTD (80), IES (1)
2012 D382 9 BPR (6), CM (10), MCTD (50)
2014 JC103 9 BPR (6), CM (10), MCTD (50)
2015 DY039 9 BPR (6), CM (9), MCTD (50), MCTDO (5), pCO2 (1), RAS (1), SeapHOx (1)

Cruise data summary

During the cruises to service the moored array, a variety of data types are collected. The table below is a summary of these data. The number of CTD profiles performed on these cruises within the box region defined above is also included. Trans-Atlantic hydrographic CTD sections have also been performed since 2004 and are included in the table.

Cruise ID Cruise description Data types Number of CTD profiles performed within the box region
D277 Initial array deployment MET, NAV, SADCP, SURF -
D279 Hydrographic section CTD, DIS, LADCP, MET, NAV, SADCP, SURF 21
CD170 Array service BATH, CTD, DIS, MET, NAV, SADCP, SURF 4
CD177 Array service BATH, CTD, DIS, MET, NAV, SADCP, SURF 6
D304 Array service CTD, DIS, MET, NAV, SADCP, SURF 8
PO343 Array service CTD, DIS, MET, NAV, SADCP, SURF 5
PO345 Array service CTD, DIS, MET, NAV, SADCP, SURF 4
D324 Array service CTD, DIS, MET, NAV, SADCP, SURF 5
D334 Array service CTD, DIS, MET, NAV, SADCP, SURF 15
D344 Array service CTD, DIS, MET, NAV, SADCP, SURF 5
D346 Hydrographic section CTD, DIS, LADCP, MET, NAV, SADCP, SURF 22
D359 Array service CTD, DIS, MET, NAV, SADCP, SURF 4
JC064 Array service CTD, DIS, MET, NAV, SADCP, SURF 5
D382 Array service CTD, DIS, MET, NAV, SADCP, SURF 5
JC103 Array service CTD, DIS, MET, NAV, SADCP, SURF 11
DY039 Array service CTD, DIS, MET, NAV, SADCP, SURF 6

Data type ID and description

Data type ID Description
ADCP Acoustic Doppler Current Profiler
BATH Bathymetry
BPR Bottom Pressure Recorder
CM Current Meter
CTD Conductivity-Temperature-Depth profiler
DIS Discrete water bottle samples
IES Inverted Echo Sounder
LADCP Lowered Acoustic Doppler Current Profiler
MET Meteorology
MCTD Moored Conductivity-Temperature-Depth sensor
MCTDO Moored Conductivity-Temperature-Depth-Oxygen sensor
MMP McLane Moored Profiler - profiling CTD and current meter
NAV Navigation
pCO2 Moored pCO2 sensor
RAS Remote Access Sampler
SADCP Shipborne Acoustic Doppler Current Profiler
SeapHOx Moored pH-Conductivity-Temperature-Depth-Oxygen sensor
SURF Sea surface data

Other Series linked to this Fixed Station for this cruise - 1112792 1112811 1112823 1112835 1112847 1133968 1133981 1133993 1134007 1134019 1134020 1134032 1134044 1134056 1134068 1134081 1134093 1134100 1134112 1134124 1134136 1134148 1134161 1134173 1134185 1134197 1134204 1134216 1134228 1134241 1134253 1134265 1134277 1134289 1134290 1134308 1134321 1134333 1134345 1134357 1134369 1134370 1134382 1134394 1134401 1134413 1196797 1196804 1268091 1268109 1268110 1268134 1268146

Other Cruises linked to this Fixed Station (with the number of series) - CD170 (52) CD177 (31) D277 (39) D304 (57) D324 (61) D334 (44) D344 (48) D346 (22) D359 (49) D382 (59) JC103 (61) PO343 (10) PO345 (30)

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