Metadata Report for BODC Series Reference Number 1727877

• 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

Problem Reports

No Problem Report Found in the Database

JC088 long-term (in-line) moored 75 kHz ADCP data (site LA): Data Quality Report

Data were found to be of good quality, however the data return for the shallowest depths were noisy. Obvious spikes and missing data were flagged within the series dataset.

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's Workhorse Long Ranger ADCP

The Workhorse Long-Ranger acoustic doppler current profiler (Teledyne RD Instruments) is a long-range and long-term self contained ADCP. It has a patented broadband signal (75 kHz) and a standard depth rating of 1500m. It operates effectively between temperatures of -5°C and 45°C and has a velocity accuracy of ±1% ±5mm/s.

The instrument comprises:

• An aluminium transducer head with four beams at 20^o from the vertical in a convex configuration, temperature sensor, electronic assemblies, fluxgate compass, pitch and roll sensors
• 4 x 28 D-cell alkaline battery packs
• 40 MB PC card internal memory (upgradeable to 440 MB)
• 1500m depth rated 6061 aluminium pressure case. End cap with wet material connector and dummy plug

JC088 moored ADCPs (Sites LA short and long term, LB, SB, SC1 and SC2): 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.

Data Processing

The Originator has supplied short term inline/single point ADCP mooring data for short term sites LA, LB, SB, SC1 and SC2 and long term site LA in Matlab structured format from two types of ADCP instruments.

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

The Matlab files were topped/tailed to only include data when the instrument was settled at its nominal depth.

No quality control have been applied to the files.

Field Calibrations

No field calibrations were undertaken.

References

Inall.M.E. et al. , (2013). RRS James Cook JC088, Glasgow to Southampton. FASTNEt Cruise to the Malin Shelf Edge. 28 th June to 24 th July 2013. A FASTNEt Cruise led by The Scottish Association for Marine Science.

JC088 moored ADCPs (Sites LA short and long term, LB, SB, SC1 and SC2): Processing by BODC

Data from 11 ADCP's arrived at BODC in Matlab structured files. Included were data from five short term inline/single point moorings and one long term mooring. The following table shows how the variables within the files were mapped to appropriate BODC parameter codes:

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

Data Activity or Cruise Information

Data Activity

FASTNEt long term inline/single point mooring LA

The LA long term mooring was deployed during FASTNEt cruise JC088 as part of the Fluxes Across the Sloping Topography of the North East Atlantic (FASTNEt) project.

The mooring was trawled a few weeks after deployment resulting in many instrument losses. Only the top section has ever been recovered by a small boat in the Hebrides at the beginning of October 2013.

Instruments deployed on the mooring

Instrument codes

ADCP - RDI ADCP (U, V, W, Temperature and Pressure)

SBE37 SM and SBE37 SMP - SBE37 CTD ( Conductivity, Temperature and Pressure) MicroCAT

SM - Star-Oddi Starmon mini Temperature Recorder

SBE56 - SBE56 logger Temperature Recorder

ML - Vemco Minilogger Temperature Recorder

A/R - Acoustic Release

ADCP 75 kHz serial 14788 was found flooded and no data was recovered from this instrument.

* The following instruments broke off from the mooring and were subsequently lost.

Related Data Activity activities are detailed in Appendix 1

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

FASTNEt JC088 LA Mooring Fixed Station

Site LA was occupied during the FASTNEt JC088 cruise.

Site LA was used to deploy one short term in-line/single point mooring and one long term in-line/single point mooring with a view to collect hydrographic data from a mixture of instruments including: ADCPs, SBE37 MicroCATs, Vemco Miniloggers and STAR-ODDI Starmon loggers.

Below are further details for this mooring site:

Related Fixed Station activities are detailed in Appendix 2

BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Appendix 1: JC088_LA(long-term)

Related series for this Data Activity are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.

Appendix 2: JC088_LA

Related series for this Fixed Station are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.