Metadata Report for BODC Series Reference Number 1222714
No Problem Report Found in the Database
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."
RD Instruments- Ocean Surveyor 150kHz Vessel mounted ADCP.
|Vertical Resolution Cell Size3||Max. Range (m)1||Precision (cm/s)2|
|4m||325 - 350||30|
|8m||375 - 400||19|
|Vertical Resolution Cell Size3||Max.Range (m)1||Precision (cm/s)2|
|4m||200 - 250||12|
|8m||220 - 275||9|
1 Ranges at 1 to 5 knots ship speed are typical and vary with situation.
2 Single-ping standard deviation.
3 User's choice of depth cell size is not limited to the typical values specified.
- Velocity long-term accuracy (typical): ±1.0%, ±0.5cm/s
- Velocity range: -5 to 9m/s
- # of depth cells: 1 - 128
- Max ping rate: 1.5
Maximum altitude (precision <2cm/s): 600m
Echo Intensity Profile
Dynamic range: 80dB
Transducer & Hardware
Beam angle: 30°
Configuration: 4-beam phased array
Communications: RS-232 or RS-422 hex-ASCII or binary output at 1200 - 115,200 baud
Output power: 1000W
Temperature (mounted on transducer)
- Range: -5° to 45°C
- Precision: ±0.1°C
- Resolution: 0.03°
Operating temperature: -5° to 40°C (-5° to 45°C)*
Storage temperature: -30° to 50°C (-30° to 60°C)*
*later instruments have greater range.
A Teledyne RD Instruments broadband 150 kHz (Ocean Surveyor) phased array style VM-ADCP is mounted in the hull 1.75 m to port of the keel, 33 m aft of the bow at the waterline, at an approximate depth of 5.3 m.
The RDI Ocean Surveyor 150 kHz Phased Array VM-ADCP was configured to sample over 120 second intervals with 50 bins of 8 m length and a blank beyond transmit of distance of 4 m. The instrument is a broad-band phased array ADCP with 153.6 kHz frequency and a 30° beam angle.
Further information on VM-ADCP instrumentation can be found in the cruise report.
The data arrived at BODC 18 individual pstar VMADCP files. The following table shows how the variables within the pstar files were mapped to the appropriate BODC parameter codes.
|bindepth||metres||Bin depth relative to sea surface||DBINAA01||metres||-|
|evelcal||cm/s||Eastward velocity from ADCP||LREWAS01||cm/s||Relative to ship's movement|
|nvelcal||cm/s||Northward velocity from ADCP||LRNSAS01||cm/s||Relative to ship's movement|
|velvert||cm/s||Upward current velocity of water column by ADCP||LRZAAS01||cm/s||-|
|velerr||cm/s||current velocity error in the water column by ADCP||LERRAS01||cm/s||-|
|intense1||db||beam 1 return||ASAMSP00||db||-|
|intense2||db||beam 2 return||ASAMSP02||db||-|
|intense3||db||beam 3 return||ASAMSP03||db||-|
|intense4||db||beam 4 return||ASAMSP04||db||-|
|good3bm||%||notifies when 3 beam solution used to generate absolute velocities||-||-||not transferred|
|verr||%||percentage of transformations rejected - prevents ADCP from rejecting data due to error velocity||-||-||not transferred|
|2+bmbad||%||percentage of pings where >1 beam is bad||-||-||not transferred|
|good4bm||%||notifies when 4 beam solution used to generate absolute velocities||-||-||not transferred|
|ve||cm/s||Ship's eastward velocity by GPS||APEWGP01||cm/s||-|
|vn||cm/s||Ship's northward velocity by GPS||APNSGP01||cm/s||-|
|absve||cm/s||Absolute eastward velocity of water column by ADCP||LCEWAS01||cm/s||-|
|absvn||cm/s||Absolute northward velocity of water column by ADCP||LCNSAS01||cm/s||-|
|lat||deg||latitude north (WGS84) using GPS system||ALATGP01||deg||-|
|lon||deg||longitude east (WGS84) using GPS system||ALONGP01||deg||-|
|distrun||km||distance run||-||-||A derived parameter, therefore not transferred|
The data were then visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag. Missing data were marked by setting the data to an appropriate absent data value and absent data quality control flag.
Originator's Data Processing
The Vessel Mounted Acoustic Doppler Current Profiler (VMADCP) was processed using pstar. Further details can be found in the cruise report.
The VMADCP was configured to run in 'Narrowband' range over resolution mode. Bottom tracking was used when over the UK continental shelf on the way out as well as the return across the UK continental shelf to port.
A calibration of the 150 kHz VMADCP was achieved using bottom tracking data available from the departure from Southampton, westwards down the channel and then northwards into the Irish Sea. No further calibration was deemed necessary from inspection of the processed data during the cruise.
Using long, straight, steady speed sections of standard two minute ensemble profiles over reasonably constant bottom depth the following calibrations for mis-alignment angle, Ø, and necessary amplification (tilt), A, were derived by comparing GPS derived component vectors of the vessel speed and direction with processed VMADCP bottom track determined component vectors of the vessel speed and direction:
Ø (mis-alignment angle):
- mean = -0.6383
- standard deviation = ± 0.1131
- mean = 1.0067
- standard deviation = ± 0.0018
Further information on calibration of the VMADCP can be found in the cruise report.
Oceans 2025 Theme 10
Oceans 2025 is a strategic marine science programme, bringing marine researchers together to increase people's knowledge of the marine environment so that they are better able to protect it for future generations.
Theme 10: Integration of Sustained Observations in the Marine Environment spans all marine domains from the sea-shore to the global ocean, providing data and knowledge on a wide range of ecosystem properties and processes (from ocean circulation to biodiversity) that are critical to understanding Earth system behaviour and identifying change. They have been developed not merely to provide long-term data sets, but to capture extreme or episodic events, and play a key role in the initialisation and validation of models. Many of these SOs will be integrated into the newly developing UK Marine Monitoring Strategy - evolving from the Defra reports Safeguarding our Seas (2002) and Charting Progress (2005), thus contributing to the underpinning knowledge for national marine stewardship. They will also contribute to the UK GOOS Strategic Plan (IACMST, 2006) and the Global Marine Assessment.
Oceans 2025 Theme 10, Sustained Observation Activity 4: The Extended Ellett Line
The Ellett Line (begun in 1975 and since 1996 the Extended Ellett Line from Scotland to Iceland) crosses important north Atlantic Meridional Overturning Circulation (MOC) components and thus provides an additional contribution to understanding the north Atlantic response to climate change. Sustained Observation Activity (SO) 4 will repeat this section annually collecting a wide variety of physical and biogeochemical measurements, and will, to enhance the time variable component, make use of Argo floats and gliders. SO 4 will be implemented by physical, biological and chemical scientists at the National Oceanography Centre, Southampton (NOCS) and the Scottish Association for Marine Science (SAMS).
SO 4 formally contributes to the Department for Environment, Food and Rural Affairs (DEFRA)-funded Marine Environmental Change Network (MECN). Established in 2002 to coordinate and promote the collection and utilisation of marine time-series and long-term data sets, the goal of the network is to use long-term marine environmental data from around the British Isles and Ireland to separate natural fluctuations from global, regional and local anthropogenic impacts.
The specific deliverables for SO 4 are:
- A time series of the evolution of the hydrography of the northeast Atlantic, together with a more formal understanding of the causes of any changes observed
- An archived data set available to the international community via the British Oceanographic Data Centre (BODC)
- A platform for further scientific research
More detailed information on this Work Package is available at pages 15 - 16 of the official Oceans 2025 Theme 10 document: Oceans 2025 Theme 10
Oceans 2025 - The NERC Marine Centres' Strategic Research Programme 2007-2012
Who funds the programme?
The Natural Environment Research Council (NERC) funds the Oceans 2025 programme, which was originally planned in the context of NERC's 2002-2007 strategy and later realigned to NERC's subsequent strategy (Next Generation Science for Planet Earth; NERC 2007).
Who is involved in the programme?
The Oceans 2025 programme was designed by and is to be implemented through seven leading UK marine centres. The marine centres work together in coordination and are also supported by cooperation and input from government bodies, universities and other partners. The seven marine centres are:
- National Oceanography Centre, Southampton (NOCS)
- Plymouth Marine Laboratory (PML)
- Marine Biological Association (MBA)
- Sir Alister Hardy Foundation for Marine Science (SAHFOS)
- Proudman Oceanographic Laboratory (POL)
- Scottish Association for Marine Science (SAMS)
- Sea Mammal Research Unit (SMRU)
Oceans2025 provides funding to three national marine facilities, which provide services to the wider UK marine community, in addition to the Oceans 2025 community. These facilities are:
- British Oceanographic Data Centre (BODC), hosted at POL
- Permanent Service for Mean Sea Level (PSMSL), hosted at POL
- Culture Collection of Algae and Protozoa (CCAP), hosted at SAMS
The NERC-run Strategic Ocean Funding Initiative (SOFI) provides additional support to the programme by funding additional research projects and studentships that closely complement the Oceans 2025 programme, primarily through universities.
What is the programme about?
Oceans 2025 sets out to address some key challenges that face the UK as a result of a changing marine environment. The research funded through the programme sets out to increase understanding of the size, nature and impacts of these changes, with the aim to:
- improve knowledge of how the seas behave, not just now but in the future;
- help assess what that might mean for the Earth system and for society;
- assist in developing sustainable solutions for the management of marine resources for future generations;
- enhance the research capabilities and facilities available for UK marine science.
In order to address these aims there are nine science themes supported by the Oceans 2025 programme:
- Climate, circulation and sea level (Theme 1)
- Marine biogeochemical cycles (Theme 2)
- Shelf and coastal processes (Theme 3)
- Biodiversity and ecosystem functioning (Theme 4)
- Continental margins and deep ocean (Theme 5)
- Sustainable marine resources (Theme 6)
- Technology development (Theme 8)
- Next generation ocean prediction (Theme 9)
- Integration of sustained observations in the marine environment (Theme 10)
In the original programme proposal there was a theme on health and human impacts (Theme 7). The elements of this Theme have subsequently been included in Themes 3 and 9.
When is the programme active?
The programme started in April 2007 with funding for 5 years.
Brief summary of the programme fieldwork/data
Programme fieldwork and data collection are to be achieved through:
- physical, biological and chemical parameters sampling throughout the North and South Atlantic during collaborative research cruises aboard NERC's research vessels RRS Discovery, RRS James Cook and RRS James Clark Ross;
- the Continuous Plankton Recorder being deployed by SAHFOS in the North Atlantic and North Pacific on 'ships of opportunity';
- physical parameters measured and relayed in near real-time by fixed moorings and ARGO floats;
- coastal and shelf sea observatory data (Liverpool Bay Coastal Observatory (LBCO) and Western Channel Observatory (WCO)) using the RV Prince Madog and RV Quest.
The data is to be fed into models for validation and future projections. Greater detail can be found in the Theme documents.
|Principal Scientist(s)||Jane F Read (National Oceanography Centre, Southampton)|
Complete Cruise Metadata Report is available here
No Fixed Station Information held for the Series
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
|<||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.)|
|E||End of CTD Down/Up Cast|
|G||Non-taxonomic biological characteristic uncertainty|
|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|
|O||Improbable value - user quality control|
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
|0||no quality control|
|2||probably good value|
|3||probably bad value|
|6||value below detection|
|7||value in excess|
|A||value phenomenon uncertain|
|Q||value below limit of quantification|