Metadata Report for BODC Series Reference Number 1797562

• 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

Western Channel Observatory (WCO) 2016 CTD Data Quality Report for CTD profile and bottle firing

There are no known data quality issues for the WCO CTD data during 2016.

Screening

Data that exceeded BODC parameter code liimits were flagged as suspect 'M'. Data were also flagged as suspect 'M' where values were equal to 0 across parameters.

Data Access Policy

Open Data

These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."

Narrative Documents

Sea-Bird Dissolved Oxygen Sensor SBE 43 and SBE 43F

The SBE 43 is a dissolved oxygen sensor designed for marine applications. It incorporates a high-performance Clark polarographic membrane with a pump that continuously plumbs water through it, preventing algal growth and the development of anoxic conditions when the sensor is taking measurements.

Two configurations are available: SBE 43 produces a voltage output and can be incorporated with any Sea-Bird CTD that accepts input from a 0-5 volt auxiliary sensor, while the SBE 43F produces a frequency output and can be integrated with an SBE 52-MP (Moored Profiler CTD) or used for OEM applications. The specifications below are common to both.

Specifications

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

Sea-Bird SBE 19 and SBE 19plus SEACAT Profiler CTDs

The SBE 19 SEACAT Profiler is a self-contained, battery powered, pumped CTD system designed to measure conductivity, temperature, and pressure in marine or fresh water environments to depths of 10,500 meters. It was replaced by the SBE 19plus model in 2001. An updated version of this instrument is the SBE 19plus V2, which incorporates an electronics upgrade and additional features, with six differentially amplified A/D input channels, one RS-232 data input channel, and 64 MB FLASH memory.

The standard CTD unit comes with a plastic housing (rated to 600 m), although this can be replaced by titanium housing for depths up to 7000 m. It is typically used for CTD profiling although a conversion kit is available for mooring deployments. The CTD can also be attached to an SBE 36 CTD Deck Unit and Power/Data Interface Module (PDIM) for real-time operation on single-core armored cable up to 10,000 m.

Specifications

*Measurements outside this range may be at slightly reduced accuracy due to extrapolation errors.

Options and accessories

Additional sensors can be attached to the CTD, including:

• high accuracy Paroscientific Digiquartz pressure sensor (depth range 0 to 20, 60, 130, 200, 270, 680, 1400, 2000, 4200, 7000 or 10500 m; accuracy 0.02% of full scale; resolution 0.0025% of full scale)
• Dissolved Oxygen (SBE 43 DO Sensor)
• pH* (SBE 18 pH Sensor or SBE 27 pH/ORP Sensor)
• fluorescence
• radiance (PAR)
• light transmission
• optical backscatter (turbidity)

The standard SBE 5M pump may be replaced by an SBE 5P (plastic housing) or 5T (titanium housing) pump for use with dissolved oxygen and/or other pumped sensors. Further details can be found in the manufacturer's SBE 19plus V2 instrument specification or theSBE 19 andSBE 19 plus user guides.

Western Channel Observatory (WCO) 2016 CTD Instrumentation for CTD profile and bottle firing

The WCO L4 and E1 sites instrumentation for 2016 before 23/05/2016 is given below:

The WCO L4 and E1 sites instrumentation for 2016 after 23/05/2016 is given below:

WETLabs ECO-FL Fluorometer

The Environmental Characterization Optics series of single channel fluorometers are designed to measure concentrations of natural and synthetic substances in water, and are therefore useful for biological monitoring and dye trace studies. Selected excitation and emission filters allow detection of the following substances: chlorophyll-a, coloured dissolved organic matter (CDOM), uranine (fluorescein), rhodamine, phycoerythrin and phycocyanin.

The ECO-FL can operate continuously or periodically and has two different types of connectors to output the data (analogue and RS-232 serial output). The potted optics block results in long term stability of the instrument and the optional anti-biofouling technology delivers truly long term field measurements.

In addition to the standard model, five variants are available, and the differences between these and the basic ECO-FL are listed below:

• FL(RT): similar to the FL but operates continuously when power is supplied
• FL(RT)D: similar model to the (RT) but has a depth rating of 6000 m
• FLB: includes internal batteries for autonomous operation and periodic sampling
• FLS: similar to FLB but has an integrated anti-fouling bio-wiper
• FLSB: similar to the FLS, but includes internal batteries for autonomous operation

Specifications

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

WET Labs {Sea-Bird WETLabs} C-Star CST-25-DR transmissometer

An underwater optical beam transmissometer capable of free-space measurements or mounting in a flow tube with a pump, with underway, moored or profiling applications. The instrument outputs calculated beam attenuation, with 14-bit digital or analog output. Sample rate is up to 8 Hz and spectral bandwidth is ~20 nm. This model has a path length of 25 cm, wavelength of 650 nm (red) and is depth rated to 6000 m.

For more information, please see this document: https://www.bodc.ac.uk/data/documents/nodb/pdf/wetlabs_cstar_transmissometer.pdf

Western Channel Observatory (WCO), L4 and E1, 2016 CTD up-cast profiles Processing Document

Originator's Protocol for Data Acquisition and Analysis

These data were collected using a CTD rig deployed from PML research vessels. The data were originally downloaded of 71 .asc files containing CTD upcast profiles. There were 21 profiles taken at the E1 site and 50 profiles taken at the L4 site.

Originator's Processing

The raw CTD data were processed using Sea-Bird software. The data were provided in tab delimited format.

BODC Data Processing Procedures

Data were downloaded from the WCO website hosted at the Plymouth Marine Laboratory with bottle firing data as .btl files alongside the CTD profile data. The data were archived under the accession PML170002. Basic checks of the data and metadata were carried out. The CTD profiles were then transferred to the BODC format and loaded to the database. The BODC parameter mappings are given below:

References

Benson, B.B. and Krause, D., 1984.The concentration and isotopic fractionation of oxygen dissolved in freshwater and seawater in equilibrium with the atmosphere. Limnol. Oceanogr., 29(3), 620-632.

Fofonoff, N.P. and Millard, R.C., 1983. Algorithms for computations of fundamental properties of seawater. UNESCO Technical Papers in Marine Science No. 44, 53pp.

Satlantic PAR sensor

Basic introduction

PAR (400 - 700 nm) sensor that measures quantum irradiance with near flat spectral response and cosine spatial response. Cosine collectors for in air and in water measurements for 2 depth ratings, 1000 m and 7000 m. Digital and analog output options. Compatible with SeaBird CTD platforms. Tilt and internal temperature measurements carried out for data quality analysis. Max sample rate of 100 Hz, PAR range 0 - 5000 µmol photons m^-2 s^-1. Cosine error 0-60° <3% and 60-85° <10%

Specifications

More information may be found in the Satlantic PAR brochure

Project Information

No Project Information held for the Series

Data Activity or Cruise Information

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Western Channel Observatory station E1

The Western Channel Observatory (WCO) is situated in the Western English Channel and comprises of sustained long-term observations at a number of stations.

Station E1 is located south-west of Plymouth at 50°2.00'N, 4°22.00'W.

More information can be found on the Western Channel Observatory website.

Related Fixed Station activities are detailed in Appendix 1

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: Western Channel Observatory E1

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.