Metadata Report for BODC Series Reference Number 835230
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
Data Description |
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Data Identifiers |
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Time Co-ordinates(UT) |
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Spatial Co-ordinates | |||||||||||||||||||||||||||||||||||||||||
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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
SonTek Argonaut-MD Acoustic Doppler Current Meter
This instrument is a 3D, vector averaging current meter with low power consumption allowing deployments of up to 2 years. It does not require calibration, has no moving parts, no threshold velocity and can be fitted with optional pressure and temperature sensors, Sea-Bird SeaCAT or an inductive modem. It uses a fixed measurement volume centered 1.25 m from the instrument for 3 MHz systems (2.0 m for 1.5 MHz systems) and is housed in a single canister (either Deltrin or Titanium) with internal memory and batteries. It can be clamped to the mooring line or mounted within a mooring cage.
Standard Features
- Optimized 45° slant, 120° orthogonal beam geometry for 3D current measurements without directional bias
- 1.5 MHz acoustic frequency
- 600 m rated Delrin housing with 40mm transducers
- Reflected echo intensity output
- RS 232 communication protocol
- ViewArgonaut Windows software allowing real time data collection, data retrieval, diagnostics and processing
- Internal memory
- Compass/tilt sensor
- Internal alkaline battery pack
Optional Features
- 6000m rated titanium housing with 40mm ceramics
- 20 mm transducers (Delrin only)
- Integrated external CT sensor
- Integrated internal inductive modem
- Mounting clamps
- Internal piezoresistive pressure sensor
- In-line load cage
- RS 422 communications protocol
Specifications
Velocity | |
---|---|
Range | ± 6 m/s |
Resolution | 0.1 cm/s |
Accuracy | ± 1% of measured velocity, ± 0.5 cm/s |
Data Output | User programmable from 10 seconds to 12 hours |
Temperature Sensor | |
Resolution | 0.01°C |
Accuracy | ± 0.1°C |
Compass/Tilt Sensor | |
Resolution | Heading, Pitch, Roll 0.1° |
Accuracy | Heading ± 2° |
Accuracy | Pitch, Roll ± 1° |
Physical and Environmental | |
Operating temperature | -5°C to 40°C |
Storage Temperature | -10°C to 50°C |
Weight in air | 5.6 kg/12.5 lb (Delrin housing) |
11.8 kg/26 lb (Titanium housing) | |
Power | |
Input power | 6-16 VDC |
Typical power consumption | 0.2-03 W (continuous operation) |
0.001 W (stand-by) | |
Battery capacity (alkaline) | 368 W-hr |
Further information is available at http://www.sontek.com or can be found in the manufacturer's specification sheet .
RAPIDMOC/MOCHA Current Meter data processing document
This document outlines the procedures undertaken to process and quality assure current meter data collected under the RAPIDMOC and MOCHA projects.
Originator's processing
The raw data are downloaded from the instrument and converted to ASCII format.
Once in ASCII format the data are corrected for the following -
- Speed bias (caused by the mooring motion)
- Sound speed (as electromagnetic current meter sensors use the speed of sound in water to calculate the doppler shift in the returned signal, they are corrected for variations in sound speed using temperature data as sound speed varies with temperature).
- Magnetic variation
A 40 hour low pass filter is also applied to the data.
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 as one file per instrument.
Once the submitted data files are safely archived, the data undergo reformatting and banking procedures:
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The data files are transferred into 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 |
---|---|---|---|---|---|---|
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 |
T | °C | Temperature | TEMPPR01 | °C | - | Transferred |
P | dbar | Pressure | PRSTPR01 | dbar | - | Transferred |
U | cm/s | Eastward velocity | LCEWEL01 | cm/s | - | Transferred |
V | cm/s | Northward velocity | LCNSEL01 | cm/s | - | Transferred |
Project Information
Meridional Overturning Circulation and Heatflux Array (MOCHA) Project
Introduction
Users of these data are referred to the Meridional Overturning Circulation and Heatflux Array (MOCHA) Project Website for more information. The following text has been taken from the website.
Scientific Rationale
To set in place a system for continuous observation of the meridional heat transport in the subtropical Atlantic, with which to document its variability and its relationship to oberved climate fluctuations, and to assess climate model predictions
Overview
MOCHA is a collaborative project, partnered with the UK RAPID Program, to measure the heat and freshwater transports of the North Atlantic Ocean. These transports are called the Thermohaline or Overturning Circulation. Simply put, warm waters move poleward at the surface of the ocean, where they cool and sink, to return equatorward in the deep ocean.
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2006-10-07 |
End Date (yyyy-mm-dd) | 2008-04-17 |
Organization Undertaking Activity | Rosenstiel School of Marine and Atmospheric Science |
Country of Organization | United States |
Originator's Data Activity Identifier | WB3#3 |
Platform Category | subsurface mooring |
RAPID Moored Instrument Rig WB3#3
This rig was deployed as part of the Western Boundary (WB) array of the MOCHA/RAPIDMOC project.
Deployment cruise | RV Seward Johnson cruise SJ14-06 |
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Recovery cruise | RV Seward Johnson cruise SJ08-03 |
The rig was anchored to the sea bed and was kept erect by a large sub-surface float supplemented by groups of smaller buoyancy all attached on titanium swivels.
Instruments deployed on the rig
Depth | Instrument |
---|---|
55m | Sea-Bird SBE37 SMP MicroCAT (#0481) |
99m | Nortek Aquadopp current meter (#1138) |
100m | Sea-Bird SBE37 SMP MicroCAT (#4622) |
245m | Sea-Bird SBE37 SMP MicroCAT (#0484) |
396m | Nortek Aquadopp current meter (#1123) |
400m | Sea-Bird SBE37 SMP MicroCAT (#4623) |
595m | Sea-Bird SBE37 SMP MicroCAT (#0487) |
790m | Sea-Bird SBE37 SMP MicroCAT (#4626) |
804m | SonTek Argonaut MD current meter (#D309) |
993m | Sea-Bird SBE37 SMP MicroCAT (#4625) |
1195m | Sea-Bird SBE37 SMP MicroCAT (#4624) |
1209m | Nortek Aquadopp current meter (#1148) |
1600m | Sea-Bird SBE37 SMP MicroCAT (#3166) |
2001m | Sea-Bird SBE37 SMP MicroCAT (#3167) |
2022m | Nortek Aquadopp current meter (#1144) |
2502m | Sea-Bird SBE37 SMP MicroCAT (#3860) |
3003m | Sea-Bird SBE37 SMP MicroCAT (#4627) |
3035m | Nortek Aquadopp current meter (#1136) |
3505m | Sea-Bird SBE37 SMP MicroCAT (#4628) |
4004m | Sea-Bird SBE37 SMP MicroCAT (#3163) |
4038m | Nortek Aquadopp current meter (#1156) |
4505m | Sea-Bird SBE37 SMP MicroCAT (#3862) |
4815m | Sea-Bird SBE37 SMP MicroCAT (#3864) |
Instrument Sea-Bird SBE37 MicroCAT #3864 was flooded and no data are expected
Other Series linked to this Data Activity - 831173 831185 831253 835278 831161 831228 831265 831289 831216 835242 835266 831148 831136 835229 831197 831277 835254 831124 831204 831241 835217
Cruise
Cruise Name | SJ-14-06 |
Departure Date | 2006-09-25 |
Arrival Date | 2006-10-12 |
Principal Scientist(s) | William E Johns (Rosenstiel School of Marine and Atmospheric Science) |
Ship | RV Seward Johnson |
Complete Cruise Metadata Report is available here
Fixed Station Information
Fixed Station Information
Station Name | Western Boundary Array |
Category | Offshore area |
Latitude | 26° 37.50' N |
Longitude | 73° 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 | 12 (7 RAPIDMOC, 5 MOCHA) | ADCP (2), BPR (7), CM (43), MCTD (86), DVS (1) |
2012 | RB1201, EN517, D382 | 23 (19 RAPIDMOC, 4 MOCHA) | ADCP (3), BPR (18), CM (74), MCTD (130) |
2014 | JC103, AE14-04 | 13 (9 RAPIDMOC, 4 MOCHA) | ADCP (4), BPR (9), CM (46), MCTD (73) |
2015 | EN570, DY039 | 13 (9 RAPIDMOC, 4 MOCHA) | ADCP (6), BPR (9), CM (46), CO2 (1), MCTD (86), MOCTD (12), PH (1), RAS (2) |
2017 | JC145, EN598 | 13 (9 RAPIDMOC, 4 MOCHA) | ADCP (6), BPR (7), CM (46), CO2 (1), MCTD (86), MOCTD (12), PH (1), RAS (2) |
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, SADCP, SURF | 8 |
JC103 | Array service | CTD, DIS, MET, NAV, SADCP, SURF | 7 |
EN570 | Array service | CTD, DIS, LADCP, MET, NAV, SURF | 7 |
DY039 | Array service | CTD, DIS, MET, NAV, SADCP, SURF | tbc |
JC145 | Array service | CTD, DIS, MET, NAV, SADCP, SURF | tbc |
EN598 | Array service | CTD, DIS, LADCP, MET, NAV, SURF | tbc |
Data type ID and description
Data type ID | Description |
---|---|
ADCP | Acoustic Doppler Current Profiler |
BATH | Bathymetry |
BPR | Bottom Pressure Recorder |
CM | Current Meter |
CO2 | CO2 sensor |
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 |
PH | Ph sensor |
RAS | Remote Access Sampler |
SADCP | Shipborne Acoustic Doppler Current Profiler |
SURF | Sea surface data |
Other Series linked to this Fixed Station for this cruise - 775704 775716 775728 775741 775753 775765 775777 775789 775790 775808 775821 775833 775845 775857 775869 775870 831124 831136 831148 831161 831173 831185 831197 831204 831216 831228 831241 831253 831265 831277 831289 831290 831308 831321 831333 831345 831357 831369 831370 831382 831394 831401 831413 831425 831437 831449 831450 835198 835205 835217 835229 835242 835254 835266 835278 838412 895491 895509 895510 895522 895534
Other Cruises linked to this Fixed Station (with the number of series) - AE1404 (22) D278 (90) D344 (10) D345 (43) D346 (31) D382 (85) EN517 (11) JC103 (36) KN182_2 (87) KN200-4 (135) OC459-1 (71) RB0602 (42) RB0701 (58) RB0901 (78) RB1009 (24) RB1201 (91) SJ-08-03 Leg 1 (39) SJ-08-03 Leg 2 (76)
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 |
Q | value below limit of quantification |