Metadata Report for BODC Series Reference Number 2047217

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

Data Category

Currents -subsurface Eulerian

Instrument Type

Name	Categories
Teledyne RDI Workhorse Sentinel-600 ADCP	current profilers

Instrument Mounting

subsurface mooring

Originating Country

United Kingdom

Originator

Dr Phil Hosegood

Originating Organization

University of Plymouth School of Marine Science and Engineering

Processing Status

banked

Online delivery of data

Download available - Ocean Data View (ODV) format

Project(s)

Wave Hub baseline study

Data Identifiers

Originator's Identifier	MADCP_201205.T
BODC Series Reference	2047217

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm)	2012-05-19 00:00
End Time (yyyy-mm-dd hh:mm)	2012-05-19 23:59
Nominal Cycle Interval	1.0 seconds

Spatial Co-ordinates

Latitude	50.34592 N ( 50° 20.8' N )
Longitude	5.59967 W ( 5° 36.0' W )
Positional Uncertainty	0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth	2.12 m
Maximum Sensor or Sampling Depth	49.12 m
Minimum Sensor or Sampling Height	6.38 m
Maximum Sensor or Sampling Height	53.38 m
Sea Floor Depth	55.5 m
Sea Floor Depth Source	SCILOG
Sensor or Sampling Distribution	Sensor fixed with measurements made at multiple depths within a fixed range (e.g. ADCP) - 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 or Sampling Depth Datum	Approximate - Depth is only approximate
Sea Floor Depth Datum	Chart reference - Depth extracted from available chart

Parameters

BODC CODE	Rank	Units	Title
DBINAA01	0	Metres	Depth (spatial coordinate) of ADCP bin relative to water surface {bin depth} in the water body
AADYAA01	1	Days	Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01	1	Days	Time (time between 00:00 UT and timestamp)
ACYCAA01	1	Dimensionless	Sequence number
LCEWAP01	2	Centimetres per second	Eastward velocity of water current (Eulerian measurement) in the water body by moored acoustic doppler current profiler (ADCP)
LCNSAP01	2	Centimetres per second	Northward velocity of water current (Eulerian measurement) in the water body by moored acoustic doppler current profiler (ADCP)
LERRAP01	2	Centimetres per second	Error velocity of water current in the water body by moored acoustic doppler current profiler (ADCP)
LRZAAP01	2	Centimetres per second	Upward velocity of water current in the water body by moored 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

Teledyne RDI Workhorse Sentinel 600 kHz Acoustic Doppler Current Profiler (ADCP)

The Workhorse Sentinel is a self-contained ADCP that can be used either on a mooring or mounted in the hull of a moving vessel. Its 4-beam design provides a redundant data source (in case of a blocked or damaged beam), an independent data quality measure (error velocity) and reduces the variance in data, thereby improving data reliability, quality and accuracy.

Real-time data can be transmitted to shore via a cable link or acoustic modem or they can be stored internally. Sensors for bottom tracking, pressure and directional wave measurements can be added to the instrument and a special casing is available for deeper applications.

Specifications

Typical range	50 m
Number of depth cells	1 to 128
Typical ping rate	2 Hz
Standard depth rating	200 to 6000 m
Beam angle	20 °
Echo intensity profile
Dynamic range	80 dB
Precision	± 1.5 dB
Velocity
Accuracy	0.3% of the water velocity relative to the ADCP ± 0.3 cm s^-1
Resolution	0.1 cm s^-1
Range	± 5 m s^-1 (default) ± 20 m s^-1 (maximum)
Vertical resolution	Range / Std Dev
for 0.5 m	39 m / 12.9 cm s^-1
for 1 m	43 m / 6.1 cm s^-1
for 2 m	47 m / 3.0 cm s^-1
for 4 m	52 m / 2.0 cm s^-1
Long Range mode
Range	70 m
Depth cell size	4 m
Std Deviation	4.2 cm s^-1
Temperature
Operating temp.	-5 to 45 °C
Precision	± 0.4 °C
Resolution	0.01 °C
Tilt
Range	± 15 °
Accuracy	± 0.5 °
Precision	± 0.5 °
Resolution	0.01 °
Compass
Accuracy	± 2 °
Resolution	0.01 °
Maximum tilt	± 15 °
Precision	± 0.5 °

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

Wave Hub site ADCP mooring May 2012: Originator's processing

Sampling Strategy

The ADCP mooring was deployed from the 13/05/2012-22/05/2012 using the Plymouth University vessel, RV Falcon Spirit. Data were collected for Wave Hub Baseline Study project funded by NERC grant NE/I015108/1.

Data Processing

No post-processing was applied to the file. It was submitted to BODC as raw ASCII format from the instrument.

No quality control flags have been applied to the files.

Field Calibrations

No field calibrations were undertaken.

Wave Hub site ADCP mooring May 2012: Processing by BODC

Data from one moored ADCP mooring arrived at BODC in tab delimited text file. The mooring was active between 13/05/2012-22/05/2012 and was part of the Wave Hub Baseline Study project. This was converted into a matlab file for transfer into BODCs database. The following table shows how the variables within the files were mapped to appropriate BODC parameter codes:

Originator's Variable	Units	BODC Parameter Code	Units	Comment
vele	mm/s	LCEWAP01	cm/s	Units were converted by dividing by 10.
veln	mm/s	LCNSAP01	cm/s	Units were converted by dividing by 10.
velver	mm/s	LRZAAP01	cm/s	Units were converted by dividing by 10.
velerr	mm/s	LERRAP01	cm/s	Units were converted by dividing by 10.
mag	mm/s	-	-	Channel not transferred
dir	Degrees True	-	-	Channel not transferred
pg1	Percent	-	-	Channel not transferred
pg2	Percent	-	-	Channel not transferred
pg3	Percent	-	-	Channel not transferred
pg4	Percent	-	-	Channel not transferred

The reformatted data were visualised using BODC's in-house visualisation software. Suspect data were marked by adding an appropriate quality control flag, missing data by both setting the data to an appropriate absent data value and setting the quality control flag.

*The beam percentages were supplied by the originator but they are not included in the final BODC files. They are available on request in the original format, along with the Mag and Dir channels.

Project Information

NERC Discovery Science - Wave Hub baseline study

Background

This proposal has been designed to fill urgent scientific gaps in relation to baseline studies in renewable energy test sites and to take advantage of the unique opportunity presented by the development of the Wave Hub demonstrator site.

This project was funded by the NERC grant - NE/I015108/1 Wave Hub baseline study.

It is essential to obtain this information prior to deployment of infrastructure to understand the impact of arrays of wave devices together with the Wave Hub infrastructure. This opportunity has already been lost at other wave energy device testing sites (such as at European Marine Energy Centre (EMEC), Orkney), because devices, together with infrastructure such as moorings and cabling have already been installed.

This project is also driven by the need to expand the science capability and resources over the next five years to address the questions which have arisen directly in respect of marine renewable energy development and sustainable use of marine resources. Hence, many of the activities are also viewed as capacity building and skill development within Plymouth Marine Laboratory (PML) - Partnership for Research in Marine Renewable Energy (PRIMaRE) that are pivotal to address the scientific requirements of the renewable energy sector.

Scientific Objectives

To obtain:

Detailed oceanographic study at the Wave Hub site and surrounds - covering the whole range of physical, chemical and biological parameters before the deployment of Wave Hub infrastructure and wave energy devices.
Ensure data acquisition in time and space to allow development of physical and ecosystem models at scales relevant to wave arrays. Ultimately models will make predictive assessments of the extent, timescales and intensity of ecosystem impacts and perturbation resulting from implementation of wave energy arrays.
Engagement of environmental economists to ensure these same data can be used to develop economic valuation estimates of critical life supporting ecosystem services at scales appropriate to arrays of wave devices for comparison with other uses of marine space.
To address the questions which have arisen directly in respect of marine renewable energy development and sustainable use of marine resources.

Fieldwork

The data were acquired from the RV Falcon Spirit, the Plymouth University vessel. The small 14m catermaran was used on a daily basis from 13 May 2012 to 24 May 2012 with the idea to capture high quality, spatially resolved field data ahead of the Wave Hub construction.

Instrumentation

Types of instruments/measurements:

CTDs
Moored temperature loggers
VMADCP
Moored ADCPs
Towed undulated CTD

Contacts

Collaborator	Organisation
Dr Phil Hosegood (lead)	University of Plymouth School of Marine Science and Engineering
Dr Ricardo Torres	Plymouth Marine Laboratory, U.K

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd)	2012-05-13
End Date (yyyy-mm-dd)	2012-05-22
Organization Undertaking Activity	University of Plymouth School of Marine Science and Engineering
Country of Organization	United Kingdom
Originator's Data Activity Identifier	mADCP_201205
Platform Category	subsurface mooring

Wave Hub site ADCP mooring May 2012 for NERC grant NE/I015108/1

Deployment	RV Falcon Spirit (13/05/2012 10:45:00)
Recovery	RV Falcon Spirit (24/05/2012 13:42:00)
Deployment Position	50.34592�N, -5.59967�E
Water Depth (m)	55.5

The ADCP was in an MSI bed frame, and the mooring was kept upright by a large sub-surface float.

Instrument deployed on the mooring

614 kHz Broadband Upward facing ADCP

Height above bed (m)	Instrument serial number
0.7	1517

Related Data Activity activities are detailed in Appendix 1

Cruise

Cruise Name	2012-05
Departure Date	2012-05-13
Arrival Date	2012-05-24
Principal Scientist(s)	Phil Hosegood (University of Plymouth School of Marine Science and Engineering)
Ship	RV Falcon Spirit

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