Metadata Report for BODC Series Reference Number 1137411


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) RAPIDMOC
RAPID-WATCH
 

Data Identifiers

Originator's Identifier 6WB4L6/399
BODC Series Reference 1137411
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2010-03-30 04:00
End Time (yyyy-mm-dd hh:mm) 2012-02-25 11:30
Nominal Cycle Interval 1800.0 seconds
 

Spatial Co-ordinates

Latitude 26.36300 N ( 26° 21.8' N )
Longitude 75.70700 W ( 75° 42.4' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth 4705.0 m
Maximum Sensor Depth 4705.0 m
Minimum Sensor Height 1.0 m
Maximum Sensor Height 1.0 m
Sea Floor Depth 4706.0 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


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

Instrument Serial number 0399
Deployment cruise OC459-1
Recovery cruise RB1201

Processing Log

purge_bp.m: Pressure offset of 11.75 dbar removed
purge_bp.m: 0 spikes removed

Exponential-linear pressure fit to be stored with data:
amplitude of exponential decay: 0.020894 db
time-constant of exponential decay: 24.532057 days
linear slope: -0.000042 db/day
mean offset: 4788.754135 db

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

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)


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) 2010-03-30
End Date (yyyy-mm-dd) 2012-02-25
Organization Undertaking ActivityNational Oceanography Centre, Southampton
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierWB4L6_6
Platform Categoryfixed benthic node

RAPID Moored Instrument Rig WB4L6_6

This rig was deployed as part of the Western Boundary (WB) array of the RAPIDMOC project.

Deployment cruise RV Oceanus cruise OC459-1
Recovery cruise NOAA Ship Ronald H. Brown cruise RB1201

The rig was anchored by a 500 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
4705 m Sea-Bird SBE26 SEAGAUGE Wave and Tide Recorder (#0399)
4705 m Sea-Bird SBE26 SEAGAUGE Wave and Tide Recorder (#0400)

Other Series linked to this Data Activity - 1137423

Cruise

Cruise Name OC459-1
Departure Date 2010-03-23
Arrival Date 2010-04-04
Principal Scientist(s)Christopher S Meinen (NOAA Atlantic Oceanographic and Meteorological Laboratory)
Ship RV Oceanus

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameWestern Boundary Array
CategoryOffshore area
Latitude26° 37.50' N
Longitude73° 37.50' W
Water depth below MSL

RAPIDMOC/MOCHA Western Boundary (WB) Array

The Western Boundary Array defines a box in which moorings were deployed at the western side of the North Atlantic as part of the RAPIDMOC project and the collaborative project Meridional Overturning Circulation and Heatflux Array (MOCHA). The box region has latitudinal limits of 26° N to 27.5° N and longitudinal limits of 69.5° W to 77.5° W. Moorings have occupied this region since 2004 and are typically deployed for 6 to 18 months.

Moored data summary

Year Cruise ID Number of moorings Data types (number of instruments)
2004 D278 9 (6 RAPIDMOC, 3 MOCHA) ADCP (2), BPR (8), CM (29), MCTD (52), MMP (1)
2005 KN182_2 11 (6 RAPIDMOC, 5 MOCHA) ADCP (2), BPR (6), CM (27), MCTD (56)
2006 RB06-02, SJ14-06 11 (6 RAPIDMOC, 5 MOCHA) ADCP (1), BPR (3), CM (22), IES (7), MCTD (60)
2007 RB07-01 7 (7 RAPIDMOC) ADCP (1), BPR (4), CM (16), MCTD (47)
2008 SJ08-03 11 (8 RAPIDMOC, 3 MOCHA) ADCP (2), BPR (3), CM (40), MCTD (80)
2009 RB0901, D344, D345 16 (11 RAPIDMOC, 5 MOCHA) ADCP (2), BPR (5), CM (39), MCTD (91), DVS (1)
2010 OC459-1, RB1009 9 (8 RAPIDMOC, 1 MOCHA) ADCP (1), BPR (7), CM (23), MCTD (54)
2011 KN200-4 7 (7 RAPIDMOC, 6 MOCHA) ADCP (2), BPR (7), CM (43), MCTD (86), DVS (1), IES (1)
2012 RB1201, EN517, D382 24 (19 RAPIDMOC, 5 MOCHA) ADCP (3), BPR (19), CM (74), MCTD (130), IES(1)
2014 JC103 24 (9 RAPIDMOC) BPR (8), CM (22), MCTD (36)

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 DIS, MET, NAV, SADCP, SURF 1
D278 Initial array deployment DIS, MET, NAV, SADCP, SURF 16
D279 Hydrographic section CTD, DIS, LADCP, MET, NAV, SADCP, SURF 31
KN182_2 Array service CTD, DIS, MET, NAV, SADCP, SURF 64
RB0601 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 39
SJ14-06 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 33
RB07-01 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 36
SJ08-03 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 33
RB0901 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 35
D344 Array service CTD, DIS, MET, NAV, SADCP, SURF 3
D345 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 24
OC459-1 Array service CTD, DIS, MET, NAV, SADCP, SURF 9
OC459-2 Western Boundary Hydrographic section CTD, DIS, LADCP, MET, NAV, SADCP, SURF 27
D346 Hydrographic section CTD, DIS, LADCP, MET, NAV, SADCP, SURF 31
RB1009 WB4 service CTD, MET, SURF, NAV 2
KN200-4 Array service CTD, DIS, MET, NAV, SURF 34
RB1201 Array service CTD, DIS, MET, NAV, SURF 10
EN517 Array service CTD, DIS, LADCP, MET, NAV, SURF 31
D382 Array service CTD, DIS, MET, NAV, SURF 8
JC103 Array service CTD, DIS, MET, NAV, SURF 7

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
DVS Doppler Volume sampler
IES Inverted Echo Sounder
LADCP Lowered Acoustic Doppler Current Profiler
MET Meteorology
MCTD Moored Conductivity-Temperature-Depth sensor
MOCTD Moored Conductivity-Temperature-Depth Oxygen sensor
MMP McLane Moored Profiler - profiling CTD and current meter
NAV Navigation
SADCP Shipborne Acoustic Doppler Current Profiler
SURF Sea surface data

Other Series linked to this Fixed Station for this cruise - 1082739 1082740 1082752 1082764 1082776 1082788 1082807 1082819 1082820 1082832 1082844 1082856 1082868 1082881 1082893 1082900 1082912 1082924 1082936 1082948 1082961 1082973 1082985 1082997 1083000 1083012 1083024 1083036 1083048 1083061 1083073 1083085 1083097 1083104 1083116 1083128 1083141 1097136 1097148 1097161 1097173 1097185 1097197 1097204 1097216 1097228 1097241 1097253 1097265 1097474 1097486 1097498 1097505 1097517 1097529 1097530 1137379 1137380 1137423 1137459 1137460 1137472 1137484

Other Cruises linked to this Fixed Station (with the number of series) - D278 (90) D344 (10) D345 (43) D346 (31) D382 (79) EN517 (11) JC103 (7) KN182_2 (87) KN200-4 (135) RB0602 (42) RB0701 (58) RB0901 (78) RB1009 (24) RB1201 (91) SJ-08-03 Leg 1 (39) SJ-08-03 Leg 2 (76) SJ-14-06 (62)


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