Metadata Report for BODC Series Reference Number 946185


Metadata Summary

Data Description

Data Category Offshore sea floor pressure series
Instrument Type
NameCategories
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) Rapid Climate Change Programme
RAPIDMOC
 

Data Identifiers

Originator's Identifier 2EBH1L2/397
BODC Series Reference 946185
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2006-05-16 21:01
End Time (yyyy-mm-dd hh:mm) 2007-11-05 12:01
Nominal Cycle Interval 1800.0 seconds
 

Spatial Co-ordinates

Latitude 27.28367 N ( 27° 17.0' N )
Longitude 15.42217 W ( 15° 25.3' 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 1.0 m
Maximum Sensor Height 1.0 m
Sea Floor Depth 3019.0 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 Approximate - Depth is only approximate
 

Parameters

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
PRSTRS01 1 Decibars NonTidalResidual Pressure (residual) exerted by the water body plus atmosphere by fixed in-situ pressure sensor and subtraction of value predicted by tidal analysis
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

RAPIDMOC Data Quality Report

The pressure and pressure residual data are of good quality.

The temperature data in all series have step-like features. This is thought to be due to the magnitude of the changes in temperature being approximately equal to the resolution of the instrument. Therefore, the temperature data should be used with caution.


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 ( www.seabird.com ) 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.

Specifications

Pressure

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: Series 946185

BODC Series identifier 946185
Instrument Serial number 0397
Deployment cruise D304
Recovery cruise D324

Processing Log

purge_bp.m: Pressure offset of 11.95 dbar NOT removed
purge_bp.m: 2 spikes removed

RAPIDMOC Sea-Bird SEAGAUGE data processing document

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

Originator's processing

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

Processing

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 as two files per instrument.

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 :

File extension Identifier Unit Definition BODC parameter code Units Unit conversion Comments
use YY year Year AADYAA01 days - Combined with MM and DD to form a date and transferred
use MM month Month AADYAA01 days - Combined with MM and DD to form a date and transferred
use DD day Day AADYAA01 days - Combined with MM and DD to form a date and transferred
use HH hour Decimal hours AAFDZZ01 days /24 Transferred
use P decibars Pressure PRSTPS01 decibars - Transferred
use T °C Temperature (IPTS-90) TEMPPR01 °C - Transferred
use PFIT decibars Exponential-linear or pure linear trend of pressure (decibars). - - - See parameter derivation table below
seagauge YY year Year AADYAA01 days - Combined with MM and DD to form a date and transferred
seagauge MM month Month AADYAA01 days - Combined with MM and DD to form a date and transferred
seagauge DD day Day AADYAA01 days - Combined with MM and DD to form a date and transferred
seagauge HH hour Decimal hours AAFDZZ01 days /24 Transferred
seagauge P decibars Pressure residual after drift removal and 2-day low pass filtering i.e. tides removed PRSTRS01 decibars - 12 hour resolution, transferred
seagauge T °C Temperature (IPTS-90) - - - Not transferred as use file contains higher resolution
seagauge PFIT decibars Harmonic fit of the fortnightly and monthly tides (decibars) - - - Not transferred as only a tidal prediction

Parameter derivation

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

BODC parameter code Units File extension Identifier Definition Units Equation Comments
PRSTDR01 decibars use
use

P
PFIT

Pressure
Exponential-linear or pure linear trend of pressure.
decibars
decibars

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

Project Information

Rapid Climate Change (RAPID) Programme

Rapid Climate Change (RAPID) is a £20 million, six-year (2001-2007) programme of the Natural Environment Research Council (NERC). The programme aims to improve our ability to quantify the probability and magnitude of future rapid change in climate, with a main (but not exclusive) focus on the role of the Atlantic Ocean's Thermohaline Circulation.

Scientific Objectives

Projects

Overall 38 projects have been funded by the RAPID programme. These include 4 which focus on Monitoring the Meridional Overturning Circulation (MOC), and 5 international projects jointly funded by the Netherlands Organisation for Scientific Research, the Research Council of Norway and NERC.

The RAPID effort to design a system to continuously monitor the strength and structure of the North Atlantic Meridional Overturning Circulation is being matched by comparative funding from the US National Science Foundation (NSF) for collaborative projects reviewed jointly with the NERC proposals. Three projects were funded by NSF.

A proportion of RAPID funding as been made available for Small and Medium Sized Enterprises (SMEs) as part of NERC's Small Business Research Initiative (SBRI). The SBRI aims to stimulate innovation in the economy by encouraging more high-tech small firms to start up or to develop new research capacities. As a result 4 projects have been funded.


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:

References

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)


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2006-05-14
End Date (yyyy-mm-dd) 2007-11-05
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierEBH1L2_2
Platform Categoryfixed benthic node

RAPID Moored Instrument Rig EBH1L2_2

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

Deployment cruise RRS Discovery cruise D304
Recovery cruise RRS Discovery cruise D324

The rig was anchored by a 280 kg anchor and kept erect by sub-surface floats attached along the mooring. The instrument was attached to a tripod assembly.

Instruments deployed on the rig

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

Cruise

Cruise Name D304
Departure Date 2006-05-12
Arrival Date 2006-06-06
Principal Scientist(s)Torsten Kanzow (National Oceanography Centre, Southampton)
Ship RRS Discovery

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 - 745524 745536 745548 745561 745573 745585 745597 745604 745616 745628 745641 745653 745665 745677 745689 745690 745708 745721 745733 745745 745757 745769 745770 745782 745794 745801 745813 745825 745837 745849 745850 745862 745874 745886 745898 745905 745917 745929 745930 745942 745954 745966 745978 745991 770275 770287 770299 770306 770318 770331 770343 770355 770367 770379 770380 946148

Other Cruises linked to this Fixed Station (with the number of series) - CD170 (52) CD177 (31) D277 (39) D324 (61) D334 (44) D344 (48) D346 (22) D359 (49) D382 (59) JC064 (54) 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