Metadata Report for BODC Series Reference Number 1176317


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
NameCategories
Teledyne RDI Workhorse Sentinel-300 ADCP  current profilers
Instrument Mounting subsurface mooring
Originating Country Canada
Originator Dr Yuri Geshelin
Originating Organization Bedford Institute of Oceanography
Processing Status banked
Project(s) RAPID-WAVE
RAPID-WATCH
 

Data Identifiers

Originator's Identifier RS2LM#2/11433
BODC Series Reference 1176317
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2009-10-02 13:21
End Time (yyyy-mm-dd hh:mm) 2010-12-16 13:21
Nominal Cycle Interval 3600.0 seconds
 

Spatial Co-ordinates

Latitude 42.74030 N ( 42° 44.4' N )
Longitude 61.57440 W ( 61° 34.5' W )
Positional Uncertainty Unspecified
Minimum Sensor Depth 1603.6 m
Maximum Sensor Depth 1631.6 m
Minimum Sensor Height 60.4 m
Maximum Sensor Height 88.4 m
Sea Floor Depth 1692.0 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 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
 

Parameters

BODC CODE Rank Units Short Title Title
DBINAA01 0 Metres BinDep Depth below sea surface (ADCP bin)
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)
LCEWAP01 2 Centimetres per second CurrVelE_ADCP Eastward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP)
LCNSAP01 2 Centimetres per second CurrVelN_ADCP Northward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP)
LERRAP01 2 Centimetres per second ADCPER Current velocity error in the water body by moored acoustic doppler current profiler (ADCP)
LRZAAP01 2 Centimetres per second ADCPVC Upward current velocity in the water body by moored acoustic doppler current profiler (ADCP)
NCNTACS1 2 Dimensionless CountsABS Instrument output (counts) by in-situ acoustic backscatter measurement
PCGDAP01 2 Percent Percent_Good_(ADCP) Acceptable proportion of signal returns by acoustic doppler current profiler (ADCP)
 

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

RD Instruments 300kHz Workhorse Sentinel Acoustic Doppler Current Profiler

Specifications

Water velocity measurements relative to the ADCP
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 -

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:

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 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:

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

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) 2009-10-02
End Date (yyyy-mm-dd) 2010-12-16
Organization Undertaking ActivityProudman Oceanographic Laboratory (now National Oceanography Centre, Liverpool)
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierRS2LM#2
Platform Categorysubsurface mooring

RAPID Moored Instrument Rig RS2LM#2

This rig was deployed as part of the Halifax/Line RS array of the RAPID WAVE project.

Deployment cruise CCGS Hudson Cruise HUD09048 Leg1
Recovery cruise CCGS Hudson Cruise HUD10049

The rig was anchored by a cast iron sinker and kept erect by buoyancy spheres attached on the mooring.

Instruments deployed on the rig

All nominal depths have been sourced from the deployment cruise report.

Depth Instrument
1600 m Sea-Bird SBE37 SMP MicroCAT (#3680)
1650 m RDI Workhorse ADCP (#11433)
1699 m Sea-Bird SBE53 BPR (#52)

Other Series linked to this Data Activity - 1192944 1161367

Cruise

Cruise Name HUD09048 Leg1
Departure Date 2009-09-26
Arrival Date 2009-10-03
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 NameRAPID WAVE Site RS2
CategoryOffshore location
Latitude42° 44.26' N
Longitude61° 34.61' W
Water depth below MSL1703.0 m

RAPID Mooring Site RS2

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

Site occupations

Mooring identifier Mooring type Deployment date Recovery date Parameters measured
RS2LM#1 Line Mooring 03 Oct 2008    28 Sep 2009 Temperature, conductivity, salinity, pressure, bottom pressure and currents
RS2LM#2 Line Mooring 02 Oct 2009 16 Dec 2010 Temperature, conductivity, salinity, pressure, bottom pressure and currents
RS2LM#3 Line Mooring 19 Dec 2010    24 Sep 201l Temperature, conductivity, salinity, pressure, bottom pressure and currents
RS2LM#4 Line Mooring 29 Sep 2011    05 Apr 2013 Temperature, conductivity, salinity, pressure, bottom pressure and currents

Other Series linked to this Fixed Station for this cruise - 1161367 1192944

Other Cruises linked to this Fixed Station (with the number of series) - HUD08037 Leg1 (3) HUD10049 (3) HUD11043 Leg1 (1)


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