Metadata Report for BODC Series Reference Number 1222622


Metadata Summary

Data Description

Data Category Currents -subsurface Eulerian
Instrument Type
NameCategories
Teledyne RDI Ocean Surveyor 150kHz vessel-mounted ADCP  current profilers
Instrument Mounting research vessel
Originating Country United Kingdom
Originator Ms Jane Read
Originating Organization National Oceanography Centre, Southampton
Processing Status banked
Project(s) Oceans 2025
Oceans 2025 Theme 10
Oceans 2025 Theme 10 SO4
 

Data Identifiers

Originator's Identifier ADP36510
BODC Series Reference 1222622
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2011-05-23 16:43
End Time (yyyy-mm-dd hh:mm) 2011-05-24 16:45
Nominal Cycle Interval 120.0 seconds
 

Spatial Co-ordinates

Start Latitude 62.53700 N ( 62° 32.2' N )
End Latitude 63.15467 N ( 63° 9.3' N )
Start Longitude 18.06017 W ( 18° 3.6' W )
End Longitude 19.92983 W ( 19° 55.8' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth 13.0 m
Maximum Sensor Depth 405.0 m
Minimum Sensor Height -
Maximum Sensor Height -
Sea Floor Depth -
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 -
 

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)
ACYCAA01 1 Dimensionless Record_No Sequence number
ALATGP01 1 Degrees Lat_GPS Latitude north (WGS84) by unspecified GPS system
ALONGP01 1 Degrees Lon_GPS Longitude east (WGS84) by unspecified GPS system
APEWGP01 2 Centimetres per second PlatformVelE_GPS Eastward velocity (over ground) of measurement platform by unspecified GPS system
APNSGP01 2 Centimetres per second PlatformVelN_GPS Northward velocity (over ground) of measurement platform by unspecified GPS system
ASAMSP00 2 Decibels SB_ADCP_SA Signal return amplitude from the water body by shipborne acoustic doppler current profiler (ADCP) beam 1
ASAMSP02 2 Decibels SB_ADCP_SA2 Signal return amplitude from the water body by shipborne acoustic doppler current profiler (ADCP) beam 2
ASAMSP03 2 Decibels SB_ADCP_SA3 Signal return amplitude from the water body by shipborne acoustic doppler current profiler (ADCP) beam 3
ASAMSP04 2 Decibels SB_ADCP_SA4 Signal return amplitude from the water body by shipborne acoustic doppler current profiler (ADCP) beam 4
LCEWAS01 2 Centimetres per second CurrVelE_ADCP Eastward current velocity (Eulerian) in the water body by shipborne acoustic doppler current profiler (ADCP)
LCNSAS01 2 Centimetres per second CurrVelN_ADCP Northward current velocity (Eulerian) in the water body by shipborne acoustic doppler current profiler (ADCP)
LERRAS01 2 Centimetres per second ADCPER Current velocity error in the water body by shipborne acoustic doppler current profiler (ADCP)
LREWAS01 2 Centimetres per second RelCurrVelE_ADCP Eastward current velocity (relative to moving platform) in the water body by shipborne acoustic doppler current profiler (ADCP)
LRNSAS01 2 Centimetres per second RelCurrVelN_ADCP Northward current velocity (relative to moving platform) in the water body by shipborne acoustic doppler current profiler (ADCP)
LRZAAS01 2 Centimetres per second ADCPVC Upward current velocity in the water body by shipborne 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- Ocean Surveyor 150kHz Vessel mounted ADCP.

Long-Range Mode
Vertical Resolution Cell Size 3 Max. Range (m) 1 Precision (cm/s) 2
4m 325 - 350 30
8m 375 - 400 19
High-Precision Mode
Vertical Resolution Cell Size 3 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.

Profile Parameters

Bottom Track

Maximum altitude (precision <2cm/s): 600m

Echo Intensity Profile

Dynamic range: 80dB
Precision: ±1.5dB

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

Standard Sensors

Temperature (mounted on transducer)

Environmental

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.

Web Page

Further details can be found in the manufacturer's website or in the specification sheet .

Instrument Description

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 .

BODC Processing

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.

Originator's
variable
Units Description BODC
Parameter
code
Units Comments
Time seconds - - - -
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.

Field Calibrations

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):

A (tilt):

Further information on calibration of the VMADCP can be found in the cruise report .


Project Information

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:

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:

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:

In order to address these aims there are nine science themes supported by the Oceans 2025 programme:

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:

The data is to be fed into models for validation and future projections. Greater detail can be found in the Theme documents.


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.

Weblink: http://www.oceans2025.org/


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:

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

Weblink: http://www.oceans2025.org/


Data Activity or Cruise Information

Cruise

Cruise Name D365
Departure Date 2011-05-11
Arrival Date 2011-06-02
Principal Scientist(s)Jane F Read (National Oceanography Centre, Southampton)
Ship RRS Discovery

Complete Cruise Metadata Report is available here


Fixed Station Information


No Fixed Station Information held for the Series


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