Metadata Report for BODC Series Reference Number 1366651

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-300 ADCP	current profilers

Instrument Mounting

subsurface mooring

Originating Country

United Kingdom

Originator

Dr Jo Hopkins

Originating Organization

National Oceanography Centre, Liverpool

Processing Status

banked

Online delivery of data

Download available - Ocean Data View (ODV) format

Project(s)

FASTNEt

Data Identifiers

Originator's Identifier	SEB_ADCP_VEL_18072013_060000
BODC Series Reference	1366651

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm)	2013-07-18 06:00
End Time (yyyy-mm-dd hh:mm)	2013-07-18 08:00
Nominal Cycle Interval	1.0 seconds

Spatial Co-ordinates

Latitude	55.86796 N ( 55° 52.1' N )
Longitude	9.06217 W ( 9° 3.7' W )
Positional Uncertainty	0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth	53.34 m
Maximum Sensor or Sampling Depth	143.34 m
Minimum Sensor or Sampling Height	5.35 m
Maximum Sensor or Sampling Height	95.35 m
Sea Floor Depth	148.7 m
Sea Floor Depth Source	DATAHEAD
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	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	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
HEADCMMG	1	Degrees	Orientation (horizontal relative to magnetic north) of measurement platform {heading} by compass
PTCHGP01	1	Degrees	Orientation (pitch) of measurement device by unspecified GPS system
ROLLGP01	1	Degrees	Orientation (roll angle) of measurement device by unspecified GPS system
ASAMAP00	2	Decibels	Signal return amplitude from the water body by moored acoustic doppler current profiler (ADCP) beam 1
ASAMAP02	2	Decibels	Signal return amplitude from the water body by moored acoustic doppler current profiler (ADCP) beam 2
ASAMAP03	2	Decibels	Signal return amplitude from the water body by moored acoustic doppler current profiler (ADCP) beam 3
ASAMAP04	2	Decibels	Signal return amplitude from the water body by moored acoustic doppler current profiler (ADCP) beam 4
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)
PCGDAP01	2	Percent	Acceptable proportion of acoustic signal returns {percent good} from the water body by acoustic doppler current profiler (ADCP)
PCGDAP02	2	Percent	Acceptable proportion of acoustic signal returns {percent good} from the water body by moored acoustic doppler current profiler (ADCP) beam 2
PCGDAP03	2	Percent	Acceptable proportion of acoustic signal returns {percent good} from the water body by moored acoustic doppler current profiler (ADCP) beam 3
PCGDAP04	2	Percent	Acceptable proportion of acoustic signal returns {percent good} from the water body by moored acoustic doppler current profiler (ADCP) beam 4

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

FASTNEt cruise JC088 ADCP bed frame mooring site SE: Quality Report

Following in-house screening at BODC several 'M' flags have been added to the ADCP velocity channels. Due to the volume of data (1 second resolution), a high level approach has been used and therefore further quality control has been left to the discretion of the end user.

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

JC088 moored ADCPs (Sites SD, SE, SF and SG): Originator's data processing

Sampling Strategy

RRS James Cook cruise JC088 was the second of two cruises funded by the NERC 'Fluxes Across the Sloping Topography of the North East Atlantic (FASTNEt)' Consortium. JC088 was a 26 day cruise sailing on 28 June 2013 from King George V Dock, Govan to the Malin Shelf edge where inline/single point and bed frame moorings were deployed before returning to Southampton on 24 July 2013.

Setup Configuration

Site	Ping Interval	Ensemble	Pings per Ensemble	Bin Size
SE bed frame	1.2 sec	1.2 sec	1	2 m
SE inline/single point	1.2 sec	1.2 sec	1	2 m
SF2	1 sec	60 sec	60	2 m
SG	1 sec	60 sec	60	2 m
SD	2 sec	180 sec	67	4 m

Data Processing

The Originator has supplied quality controlled data for moorings SD, SE, SF, SG in Matlab structure format from three different types of instruments.

Binary data from the RDI Workhorse sentinel instruments were exported into Matlab files using the WinADCP software (v1.14) and then converted into Matlab data structures. Binary data from the Flowquest instruments were converted to ascii using the Flowquest software and then converted into Matlab data structures.

Quality Control

SE bed frame

SE inline/single point

The following quality control has been applied by the Originator to the raw velocity data. Data were removed if the associated error velocity was > 0.15 m/s and if any of the beams were flagged as bad. The Originator removed data in bin 120 meters above the Sea Bed as this was contaminated.

SF2

The following quality control has been applied by the Originator. A correction for magnetic declination = -5.533° (magnetic north to the west of true north) has been applied. Velocity data contaminated by strong sea surface echos has been removed and the bin nearest the transducer due to high signal to noise ratios and suspect velocities has also been removed. The total water depth was created from the nearest SEACAT SBE 16plus (SN 4848).

SG

The Originator applied the following quality control to data at this site. A correction for magnetic declination = -5.4° (magnetic north to the west of true north) has been applied. Velocity data contaminated by strong sea surface echos have been removed and the bin nearest the transducer due to high signal to noise ratios and suspect velocities has also been removed. The total water depth was created from the nearest SEACAT SBE 16plus (SN 5309).

SD

The ADCP suffered a serious time drift over its deployment. This was estimated to be 8 seconds drift per 3 minute ensemble. This equated to the clock being approximately 20 hours behind once recovered. The Originator has therefore linearly stretched the time as best as possible to remove this error and supplied the corrected data in another Matlab structured file. The corrected file did not include all the parameters in the original file. The parameters not included were percentage good and temperature. These parameters are not being ingested by BODC, but are available (in the uncorrected drift files) upon request.

The Originator has applied a correction for magnetic declination = -5.75° (magnetic north to the west of true north). Poor quality velocity data was removed around 60 meters above the Sea bed. The total water depth was created from pressure data from the nearest MicroCAT (SN 9113).

Merged SE ADCP data

The Originator merged the bed frame and inline/single point 300 kHz ADCP data to provide the best possible full water column profile. Data were averaged onto coincident 1 min grids and then merged at 70 metres.

Lagged cross correlations reveal that the velocities recorded by the bed frame ADCP lag those from the in-line/single point instrument (a consequence of the frame and inline/single point mooring being 680 m apart). This lag was calculated by considering the whole time series and was applied before the data sets were merged. The Originator has applied a correction for magnetic declination = -5.63° (magnetic north to the west of true north). The total water depth was created from pressure data from the nearest SEACAT SBE 16plus (SN 4597).

The merged file for SE inline/single point and SE bed frame is not being ingested by BODC but is available on request.

The Originator states in all sites that further quality control has been left to the discretion of the end user.

Field Calibrations

No field calibrations were undertaken.

JC088 moored ADCPs (Sites SD, SE, SF and SG): Processing by BODC

Data from five ADCPs arrived at BODC in Matlab structured files. Data from two ADCPs were from short term inline/single point moorings (SE and SD) and three ADCPSs were fixed to bed frames (SE, SF2 and SG). The following table shows how the variables within the files were mapped to appropriate BODC parameter codes:

Originator's Variable	Units	Description	BODC Parameter Code	Units	Comment
Eastward velocity	m/s	Eastward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP)	LCEWAP01	cm/s	Conversion from originators units to BODC units are applied during transfer. This channel applies to all sites.
Northward velocity	m/s	Northward current velocity (Eulerian) in the water body by moored acoustic doppler current profiler (ADCP)	LCNSAP01	cm/s	Conversion from originators units to BODC units are applied during transfer. This channel applies to all sites.
Vertical velocity	m/s	Upward current velocity in the water body by moored acoustic doppler current profiler (ADCP)	LRZAAP01	cm/s	Conversion from originators units to BODC units are applied during transfer. This channel applies to all sites.
Error velocity	m/s	Current velocity error in the water body by moored acoustic doppler current profiler (ADCP)	LERRAP01	cm/s	Conversion from originators units to BODC units are applied during transfer. This channel applies to sites SE inline and SE bedframe.
Along beam echo intensity	dB	Signal return amplitude from the water body by moored acoustic doppler current profiler (ADCP) (beam 1-4)	ASAMAP00, ASAMAP02, ASAMAP03, ASAMAP04	dB	This channel applies to sites SE inline and SE bedframe.
Along beam echo signal strength	dBm	Signal return amplitude from the water body by moored acoustic doppler current profiler (ADCP) (beam 1-4)	ASAMAP00, ASAMAP02, ASAMAP03, ASAMAP04	dB	This channel applies to sites SF2, SG and SD.
Percentage of good data along each bin during ensemble	%	Acceptable proportion of signal returns by moored acoustic doppler current profiler (ADCP) beam 1, beam 2, beam 3 and beam 4	PCGDAP01, PCGDAP02, PCGDAP03, PCGDAP04	%	This channel applies to sites SE inline and SE bedframe.
Percentage of good data along each bin during ensemble	%	Acceptable proportion of signal returns by moored acoustic doppler current profiler (ADCP) beam 1	PCGDAP00	%	This channel applies to sites SF2 and SG.
Ensemble average pitch	Degrees	Orientation (pitch) of measurement platform by triaxial fluxgate compass	PTCHFG01	Degrees	This channel applies to sites SE inline and SE bedframe.
Ensemble average pitch	Degrees	Orientation (pitch) of measurement platform by unspecified GPS system	PTCHGP01	Degrees	This channel applies to sites SF2, SG and SD.
Ensemble average roll	Degrees	Orientation (roll angle) of measurement platform by unspecified GPS system	ROLLGP01	Degrees	This channel applies to sites SF2, SG and SD.
Ensemble average roll	Degrees	Orientation (roll angle) of measurement platform by triaxial fluxgate compass	ROLLFG01	Degrees	This channel applies to sites SE inline and SE bedframe.
Ensemble average heading	Degrees	Orientation (horizontal relative to magnetic north) of measurement platform {heading} by compass	HEADCMMG	Degrees	This channel applies to all sites.
Ensemble average temperature	°C	Temperature of the water body	TEMPPR01	°C	This channel applies to sites SF2 and SG.

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.

Project Information

Fluxes Across Sloping Topography of the North East Atlantic (FASTNEt)

Background

The FASTNEt consortium was funded to deliver NERC's Ocean Shelf Edge Exchange Programme. Commencing in October 2011, this four year study aims to couple established observational techniques, such as moorings and CTDs, with the very latest in autonomous sampling initiatives - including use of Autosub Long Range and gliders. With the aid of novel model techniques, these observations will be utilised to construct a new paradigm of Ocean/Shelf exchange.

Shelf edge regions mark the gateway between the world's deep oceans and shallower coastal seas, linking terrestrial, atmospheric and oceanic carbon pools and influencing biogeochemical fluxes. Shelf edge processes can influence near-shore productivity (and fisheries) and ultimately affect global climate.

FASTNEt brings together researchers from multiple UK organisations. Further collaboration has been established with five Project Partners: the UK Met Office, Marine Scotland Science, Agri-Food and Biosciences Institute, Marine Institute Ireland and Scripps Institution of Oceanography.

Scientific Objectives

To determine the seasonality of physical gradients and exchange across the shelf edge by deploying new observational technologies (gliders, Autosub Long Range) and established techniques (long term moorings, drifters)
To quantify key exchange mechanisms and to collect new data targeted at testing and improving high resolution models of the shelf edge, by carrying out detailed process studies in contrasting regions of the shelf edge of the NE Atlantic margin
To develop a new parameterisation of shelf edge exchange processes suitable for regional-scale models, using improved resolution numerical, and new empirical models constrained by the observations
To test the new parameterisations in a regional model in the context of making an assessment of inter-annual variability of ocean-shelf exchange.

Fieldwork

Three survey sites on the UK shelf edge have been selected for FASTNEt. These are a) the Celtic Sea shelf edge, b) Malin shelf and c) North Scotland shelf. Fieldwork is centred around two research cruises. The first, to the Celtic Sea, on RRS Discovery in June 2012. The second cruise visits the Malin shelf on RRS James Cook, during summer 2013. In addition to these dedicated cruises, opportunist cruise activity to the North Scotland shelf has been agreed with project partner Marine Scotland Science. Autonomous technologies will complement observations made during the cruises and provide knowledge of seasonal and inter-annual variability in exchange processes.

Instrumentation

Types of instruments/measurements:

Gliders
Autosub Long Range
Drifter buoys
Scanfish
Microstructure profilers
Moored CTD/CT loggers and ADCPs
Shipboard measurements: CTD, underway, nutrients (and other discrete sampling), LADCP, ADCP.

Contacts

Collaborator	Organisation
Prof. Mark Inall (lead)	Scottish Association for Marine Science, U.K
Dr. Jason Holt	National Oceanography Centre, U.K
Dr. Peter Miller	Plymouth Marine Laboratory, U.K
Dr. Mattias Green	Bangor University, U.K
Prof. Jonathan Sharples	University of Liverpool, U.K
Dr. Vasyl Vlasenko	University of Plymouth, U.K

Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd)	2013-07-04
End Date (yyyy-mm-dd)	2013-07-19
Organization Undertaking Activity	Scottish Association for Marine Science
Country of Organization	United Kingdom
Originator's Data Activity Identifier	JC088_SE_(bed-frame)
Platform Category	subsurface mooring

FASTNEt bed frame mooring SE

The short term mooring SE bed frame was deployed and recovered during cruise RRS James Cook JC088 as part of the Fluxes Across the Sloping Topography of the North East Atlantic (FASTNEt) project.

Instruments deployed on the mooring

Depth (m)	Instrument type	Serial number
147	SBE16 + (Pumped conductivity and digiquartz pressure)	4597
147	Sontek ADVs	B292
147	Nortek Aquadopps (2MHz Coherent Doppler)	P24977-1
147	300 kHz RDI Workhorse sentinel ADCP	14745
143	Acoustic Release 1	72382
153	Acoustic Release 2	69679

Related Data Activity activities are detailed in Appendix 1

Cruise

Cruise Name	JC088
Departure Date	2013-06-28
Arrival Date	2013-07-24
Principal Scientist(s)	Mark E Inall (Scottish Association for Marine Science)
Ship	RRS James Cook

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