Metadata Report for BODC Series Reference Number 1176378
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
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Time Co-ordinates(UT) |
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Parameters |
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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
RD Instruments 300kHz Workhorse Sentinel Acoustic Doppler Current Profiler
Specifications
Water velocity measurements relative to the ADCP | |
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Maximum velocity | 10 m.s-1 |
Standard deviation | 130, 45, 25, 12, 5 mm.s-1 for depth cell sizes of 1, 2, 4, 8, 16 m, respectively |
Minimum time between pings | 0.07 s |
Maximum profiling range* | 110, 120, 130, 150, 165 m for depth cell sizes of 1, 2, 4, 8, 16 m, respectively |
Minimum range to start of first depth cell | 3 m |
Number of depth cells | 1 - 128 cells |
Depth cell size | 1 - 16 cm |
Echo Intensity measurements | |
Uncertainty | ± 1.5 dB |
Sampling | Uses same depth cells and time intervals as velocity |
Sensors | |
Water level resolution | 0.25 m |
Water level accuracy | ± 5 m over 0-200 m depth |
Temperature range | -5°C to + 45°C |
Temperature uncertainty | ± 0.4°C |
Tilt range | ± 20° |
Tilt uncertainty | ± 2° |
Compass uncertainty | ± 5° at 60° magnetic dip angle |
Compass maximum tilt | 20° |
Physical and Environmental | |
Maximum depth | 200 m |
Operating temperature | -5°C to 60°C |
Storage Temperature | -5°C to 80°C |
The manufacturer's specification document can be found here
Teledyne RDI's Workhorse Monitor ADCP
The Workhorse Monitor acoustic doppler current profler (Teledyne RD Instruments) is a long-range and long-term self contained ADCP. It has a patented four beam signal (300, 600 or 1200 kHz) and a standard depth rating of 200m or 600m. It operates effectively between temperatures of -5°C and 45°C and has a velocity accuracy of ±1% ±5mm/s.
RAPID WAVE Line RS ADCP data processing document
This document outlines the procedures undertaken to process and quality assure moored ADCP data contributing to the RAPID WAVE project (between 2008 and 2011). These ADCP data were processed by scientists at the Bedford Institute of Oceanography and supplied to the National Oceanography Centre for inclusion in the RAPID WAVE data set.
ADCP data
The nominal range of the ADCP instrument is 120 m (30 bins x 4 m per bin), with the first bin 6.16 m from the instrument. However, in practice, only the second to ninth bin were found to be of good quality for all instruments. This was due to interference caused by the MicroCAT and mooring float located 50 m and 100 m above the ADCP respectively. Ringing caused by the mooring chain also had an effect on data quality at times. As a result, only these bins were provided to BODC by the Originator.
Originator's processing
The raw data are downloaded from the instrument and converted to ASCII format.
Corrections
Once in ASCII format the data are corrected for the following -
- Bin mapping
- Sound speed
- Magnetic variation
Calculating and applying calibrations
Manufacturers calibrations are applied.
Quality control
Data were visually inspected for out-lying data and instrument electrical spikes removed.
BODC processing
Data are received after quality checks have been made and calibrations have been applied. The data files are submitted in ASCII format (with a .ODF extension) as one file per bin. BODC were also supplied with a .mat file for each mooring which incorporated the individual data for all bins associated with each mooring. BODC have retained a copy of these .mat files. These are present in our archive.
Once the submitted data files are safely archived, the data undergo reformatting and banking procedures:
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The individual .ODF files are concatenated and transferred into one file per instrument in a common format, a NetCDF subset.
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Standard parameter codes are assigned that accurately describe the data (see Parameter mapping section below).
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Unit conversions are applied, if necessary, so that units are standardised (see Parameter mapping section below).
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The data are screened visually and any spikes or instrument malfunctions can be clearly labelled with quality control flags.
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Comprehensive documentation is prepared describing the collection, processing and quality of each data series.
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Detailed metadata and documents are loaded to the database and linked to each series so that the information is readily available to future users.
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 |
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YY | year | Year | AADYAA01 | days | - | Combined with MM and DD to form a date and transferred |
MM | month | Month | AADYAA01 | days | - | Combined with YY and DD to form a date and transferred |
DD | day | Day | AADYAA01 | days | - | Combined with YY and MM to form a date and transferred |
HH | hour | Decimal hours | AAFDZZ01 | days | /24 | Transferred |
Bindepth | Metres | Depth below sea surface (ADCP bin) | DBINAA01 | Metres | - | Transferred |
U | M/s | Eastward velocity | LCEWAP01 | cm-1 | * 100 | Transferred |
V | M/s | Northward velocity | LCNSAP01 | cm-1 | * 100 | Transferred |
WERR | M/s | Error velocity | LERRAP01 | cm-1 | * 100 | Transferred |
W | M/s | Vertical velocity | LRZAAP01 | cm-1 | * 100 | Transferred |
AGC | counts | Average echo intensity (AGC) | NCNTACS1 | Dimensionless | - | Transferred |
PGd | counts | Percent good pings | PCGDAP01 | % | - | Transferred |
Project Information
RAPID Western Atlantic Variability Experiment (WAVE)
Introduction
The RAPID WAVE project began in 2004 as an observational component of the U.K Natural Environment Research Council's RAPID Climate Change Programme in the western North Atlantic Ocean. In 2008, funding to continue RAPID WAVE was secured through the continuation programme, RAPID-WATCH, which is due to end in 2014.
The RAPID WAVE team brings together scientists at the National Oceanography Centre in Liverpool. Between 2004 and 2010, the RAPID WAVE team also contributed to the Line W mooring array, joining colleagues from the U.S. Line W is a U.S-led initiative used to monitor the North Atlantic Ocean's deep western boundary current whilst being funded through the U.S National Science Foundation and has been active since October 2001. It brings together scientists from Woods Hole Oceanographic Institution (WHOI) and Lamont-Doherty Earth Observatory (LDEO). Users of these data are referred to the Line W Project Website for more information.
In 2007, further collaboration was established with scientists at the Bedford Institute of Oceanography (BIO). This arrangement was formalised and continues under RAPID-WATCH. Smaller scale collaboration with scientists at the Instituto Espanol de Oceanografia (IEO) during RAPID-WATCH saw additional RAPID WAVE observational work in the eastern North Atlantic Ocean. This work commenced in 2009 as part of the RAPID WAVE RAPIDO campaign.
Scientific Rationale
The primary aim of the RAPID WAVE project is to develop an observing system that will identify the propagation of overturning signals, from high to low latitudes, along the western margin of the North Atlantic. It specifically aims to monitor temporal changes in the Deep Western Boundary Current and reveal how coherent the changes are along the slope. Ultimately it is envisaged that this will enable scientists to develop a better understanding of larger-scale overturning circulation in the Atlantic, and its wider impacts on climate.
Fieldwork
The fieldwork aspect of the project was to deploy arrays of Bottom Pressure Recorders (BPRs) and CTD moorings along specified satellite altimeter groundtracks off the eastern continental slope of Canada and the United States. In 2004, fieldwork focused on three array lines. Line A was established heading south west from the Grand Banks, whilst the Line B array ran south east on the continental slope of Nova Scotia. The third line, Line W, was an established hydrographic array on the continental slope of New England, serviced by Woods Hole Oceanographic Institute (WHOI), to which RAPID WAVE contributed BPR instrumentation.
The original intention was that each array would be serviced by a cruise every two years. However, following a very poor return rate of instrumentation during the first servicing cruise of Lines A and B in 2006, this plan was modified significantly, and the decision made to abandon work on Line A. In 2007, additional logistical support from Canada's Bedford Institute of Oceanography (BIO) enabled Line B to be serviced again after just one year of deployment, with a much improved recovery record.
The transition from RAPID to RAPID-WATCH funding marked significant changes to the RAPID WAVE observational system. Line B was abandoned and a joint array with BIO, known as the RAPID Scotia Line, to the south west was developed. This line receives annual servicing by BIO, with cruise participation from the RAPID WAVE team.
The servicing of RAPID WAVE BPRs on Line W remained a biennial activity during the RAPID and RAPID-WATCH programmes.
A small number of BPR deployments have also taken place off the coast of Spain as part of the RAPIDO element of RAPID WAVE.
Instrumentation
Types of instruments and measurements:
- Moored BPRs
- Moored CTD/CT loggers
- Moored current meters (RAPID-WATCH)
- Moored ADCPs (RAPID-WATCH)
- Shipboard measurements: CTD, underway, salinity, LADCP, ADCP
Contacts
Collaborator | Organisation | Project |
---|---|---|
Prof. Chris M. Hughes | National Oceanography Centre, U.K | RAPID WAVE |
Dr. Miguel Angel Morales Maqueda | National Oceanography Centre, U.K | RAPID WAVE |
Dr. Shane Elipot | National Oceanography Centre, U.K | RAPID WAVE |
Dr. John M. Toole | Woods Hole Oceanographic Institution, U.S | Line W |
Dr. Igor Yashayaev | Bedford Institute of Oceanography, Canada | - |
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
- To deliver a decade-long time series (2004-2014) of calibrated and quality-controlled measurements of the Atlantic MOC from the RAPID-WATCH arrays.
- To exploit the data from the RAPID-WATCH arrays and elsewhere to determine and interpret recent changes in the Atlantic MOC, assess the risk of rapid climate change, and investigate the potential for predictions of the MOC and its impacts on climate.
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:
- How can we exploit data from the RAPID-WATCH arrays to obtain estimates of the MOC and related variables?
- What do the observations from the RAPID-WATCH arrays and other sources tell us about the nature and causes of recent changes in the Atlantic Ocean?
- What are the implications of RAPID-WATCH array data and other recent observations for estimates of the risk due to rapid change in the MOC?
- Could we use RAPID-WATCH and other observations to help predict future changes in the MOC and climate?
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2010-12-18 |
End Date (yyyy-mm-dd) | 2011-09-24 |
Organization Undertaking Activity | National Oceanography Centre, Liverpool |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | RS3LM#3 |
Platform Category | subsurface mooring |
RAPID Moored Instrument Rig RS3LM#3
This rig was deployed as part of the Halifax/Line RS array of the RAPID WAVE project.
Deployment cruise | CCGS Hudson Cruise HUD10049 |
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Recovery cruise | CCGS Hudson Cruise HUD11043 |
The rig was anchored by a cast iron sinker and kept erect by groups of buoyancy spheres attached along the mooring.
Instruments deployed on the rig
All nominal depths have been sourced from the deployment cruise report.
Depth | Instrument |
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2200 m | Sea-Bird SBE37 SMP MicroCAT (#8264) |
2250 m | RDI Workhorse ADCP (#13874) |
2299 m | Sea-Bird SBE53 BPR (#48) |
Related Data Activity activities are detailed in Appendix 1
Cruise
Cruise Name | HUD10049 |
Departure Date | 2010-12-15 |
Arrival Date | 2010-12-22 |
Principal Scientist(s) | Edward Horne (Bedford Institute of Oceanography) |
Ship | CCGS Hudson |
Complete Cruise Metadata Report is available here
Fixed Station Information
Fixed Station Information
Station Name | RAPID WAVE Site RS3 |
Category | Offshore location |
Latitude | 42° 39.50' N |
Longitude | 61° 27.70' W |
Water depth below MSL | 2286.0 m |
RAPID Mooring Site RS3
This fixed station forms part of the RAPID Scotia mooring array located on the Scotian Shelf, Nova Scotia. The RAPID Scotia array is deployed as part of the RAPID WAVE project under the RAPID-WATCH programme. This array acts as an extension to the existing Halifax Line, maintained by Bedford Institute of Oceanography (BIO), Canada.
Period of collection | October 2008 - present |
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Site occupations
Mooring type | Mooring identifier | Deployment date | Recovery date | Parameters measured |
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RS3LM#1 | Line Mooring | 03 Oct 2008 | 28 Sep 2009 | Temperature, conductivity, salinity, pressure, bottom pressure and currents |
RS3LM#2 | Line Mooring | 02 Oct 2009 | 16 Dec 2010 | Temperature, conductivity, salinity, pressure, bottom pressure and currents |
RS3LM#3 | Line Mooring | 18 Dec 2010 | 24 Sep 2011 | Temperature, conductivity, salinity, pressure, bottom pressure and currents |
RS3LM#4 | Line Mooring | 29 Sep 2011 | 05 Apr 2013 | Temperature, conductivity, salinity, pressure, bottom pressure and currents |
Related Fixed Station activities are detailed in Appendix 2
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 |
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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 |
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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 |
B | nominal value |
Q | value below limit of quantification |
Appendix 1: RS3LM#3
Related series for this Data Activity are presented in the table below. Further information can be found by following the appropriate links.
If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.
Series Identifier | Data Category | Start date/time | Start position | Cruise |
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1161287 | Hydrography time series at depth | 2010-12-18 22:40:01 | 42.65525 N, 61.45637 W | CCGS Hudson HUD10049 |
1192993 | Offshore sea floor pressure series | 2010-12-19 05:22:30 | 42.65525 N, 61.45637 W | CCGS Hudson HUD10049 |
Appendix 2: RAPID WAVE Site RS3
Related series for this Fixed Station are presented in the table below. Further information can be found by following the appropriate links.
If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.
Series Identifier | Data Category | Start date/time | Start position | Cruise |
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1161195 | Hydrography time series at depth | 2008-10-03 14:40:01 | 42.65832 N, 61.45988 W | CCGS Hudson HUD08037 Leg1 |
1176274 | Currents -subsurface Eulerian | 2008-10-03 15:30:00 | 42.6583 N, 61.4599 W | CCGS Hudson HUD08037 Leg1 |
1040884 | Offshore sea floor pressure series | 2008-10-04 00:42:29 | 42.65832 N, 61.45988 W | CCGS Hudson HUD08037 Leg1 |
1176329 | Currents -subsurface Eulerian | 2009-10-02 11:21:00 | 42.6586 N, 61.4573 W | CCGS Hudson HUD09048 Leg1 |
1161379 | Hydrography time series at depth | 2009-10-02 11:30:01 | 42.65948 N, 61.45689 W | CCGS Hudson HUD09048 Leg1 |
1192981 | Offshore sea floor pressure series | 2009-10-02 17:42:29 | 42.65948 N, 61.45689 W | CCGS Hudson HUD09048 Leg1 |
1161287 | Hydrography time series at depth | 2010-12-18 22:40:01 | 42.65525 N, 61.45637 W | CCGS Hudson HUD10049 |
1192993 | Offshore sea floor pressure series | 2010-12-19 05:22:30 | 42.65525 N, 61.45637 W | CCGS Hudson HUD10049 |
1193007 | Offshore sea floor pressure series | 2011-09-29 20:27:29 | 42.65593 N, 61.45643 W | CCGS Hudson HUD11043 Leg1 |