Metadata Report for BODC Series Reference Number 1806604

• 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

Inner Clyde Estuary Monitoring Buoy 2016 Quality Report

Screening and Quality Control

Data have had quality control applied by the Scottish Environment Protection Agency (SEPA) where any suspect data were removed. Data then went through BODC quality control procedure where suspect data were flagged but not removed from the dataset. During BODC processing any null periods in the data were removed where a parameter was null for the duration of a cruise-to-cruise event. Null periods were removed in the following channels:

CPHLZZXX

• 06 OCT 2016 - 02 NOV 2016 (surface sensor only)

TURBXXXX

• 14 APR 2016 - 10 MAY 2016 (surface sensor only)

PHXXZZXX

• 06 SEPT 2016 - 06 OCT 2016 (bottom sensor only)

There was also a cruise-to-cruise event in the data where all channels were null and so the period was removed during BODC processing:

• 11 FEB 2016 - 08 MAR 2016 (surface sensor only)

During BODC quality control, data were screened using in house visualisation software. The data were screened and any obvious outliers and spikes were looked at in closer detail and flagged if necessary. It was not considered that the data required extensive flagging as the data had already been through thorough SEPA QC procedures. Spikes were flagged in both the TURBXXXX and CPHLZZXX channels were they were clear and obvious above the rest of the data and regarded as suspect. There was also considerable variability in the DOXYZZ01 and OXYSZZ01 channels but as this was similar to previous years' data from the site, it was not considered that any points in these channels required flagging.

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

YSI 6-Series multiparameter water quality sondes

Basic information

Comprehensive multi-parameter, water quality monitoring sondes. Designed for long-term monitoring, profiling and spot sampling. The 6-series may be split into several categories: V2 Sondes, 600 Sondes, Drinking Water Sondes and System. Each category has a slightly different design purpose with V2 Sondes ideal for long-term monitoring with a greater number of parameters, whereas 600 sondes are ideal for specific applications with fewer parameters available.

Model features/parameters

^*Freshwater only^**Calculated parameters

Sensor Specifications

For further information, please see the manufacturer's manual and data sheet.

SEPA Mooring Instrumentation

The SEPA long-term monitoring project has obtained hydrographic data across various moorings through the deployment of a YSI 6600 multi-parameter-sonde attached to a fixed mooring buoy at the surface of the water column.

These mooring sites include: Dunoon, Gunnet Ledge, Inner Clyde Estuary, Campbelltown, Loch Striven, Ythan, Loch Sunart, South Alloa, and Moray Firth.

The South Alloa site had two Hydrolab MS5 probes up until the 3rd of March 2011, at which point a YSI 6600 probe was used.

The Inner Clyde Estuary site also has a probe attached approximately 1 m from the sea floor in addition to the probe at the surface.

The Moray Firth site was monitored solely between July and December 2018.

The depth of the sensors at the time of measurement at each site is available upon request for the 2016 and 2017 data.

The turbidity sensors are deemed, by the manufacturer, to be used as guidance in events such as observing storm events or spotting discharges. SEPA rely on a suspended solids laboratory procedure for their turbidity reported data. The same situation occurs for chlorophyll, SEPA have a lab method they use to report it as high turbidity can interfere with the readings. This is not generally an issue in low turbidity areas.

BODC processing of SEPA's long-term monitoring buoys

Data Acquisition and Transfer

The data were sent by SEPA as yearly .csv files and following BODC's procedures the files were checked for consistency and subsequently archived.

The data were reformatted to QXF format using BODC's established procedures. During the transfer process each yearly file was split into cruise-to-cruise series events. The table below shows how the originator's parameters were mapped to BODC parameters and their units:

Data Quality and Screening

Not all parameters occur in all series, particularly pH, turbidity and chlorophyll.

Oxygen saturation is not derived by BODC for consistency across all years and due to missing channels as mentioned in the originator's processing document.

The standard unit conversion factor of * 31.252 was applied to oxygen concentration during transfer to obtain the BODC units of µmol/l. (Bittig et al., 2018)

Post transfer analysis and crosschecks were applied according to BODC procedures. This involved the screening of data to check flags were appropriately applied whilst also applying further quality control flags where appropriate. Originator flags for "No sensor; Quality Control failure; Quality Control Spike Removed; Quality Control Spike removed, wiper incorrectly parking over sensor; Power Failure, Sensor failure" were all flagged as 'Null' as no data were available when these were applied.

References

Bittig, H., Körtzinger, A., Johnson, K., Claustre, H., Emerson, S., Fennel, K., ... & Xing, X. 2018. SCOR WG 142: Quality Control Procedures for Oxygen and Other Biogeochemical Sensors on Floats and Gliders. Recommendations on the conversion between oxygen quantities for Bio-Argo floats and other autonomous sensor platforms.

SEPA originator's processing document for Inner Clyde Estuary long-term monitoring buoy.

Data Acquisition and Analysis

Data were obtained from two YSI probes deployed in the Inner Clyde Estuary. Two separate moorings were deployed at the same location, one with a sensor attached 1 m from the surface and the other with a sensor attached 1 m from the bottom of the river bed. The moorings were serviced and deployed by the Scottish Environment Protection Agency (SEPA) for the purpose of a long-term investigation monitoring dissolved oxygen levels in the given area. All data were submitted in GMT format.

Quality and Screening

Once downloaded the data went through SEPA data quality checks with suspect data removed and relevant flags attached to inform future users of the reasons for any missing data.

Submission

The data were then submitted to BODC through ftp as .csv files.

Project Information

No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

SEPA Inner Clyde Estuary Mooring Data Activity

The mooring deployed consists of two YSI probes located at either end of the mooring, one at the surface and one at the base. The first buoy is situated approximately 1 m from the surface and the bottom buoy situated approximately 1 m from the bottom depth. The mooring was deployed by the Scottish Environmental Protection Agency (SEPA) and sampling began on the 3 August 2011. There are considerable periods of missing data due to quality control procedures carried out by SEPA. The table below details the serial numbers of the probes used since the mooring was deployed.

Related Data Activity activities are detailed in Appendix 1

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

SEPA Inner Clyde Estuary Fixed Station Mooring

The buoy is located in the Clyde estuary and provides measurements of dissolved oxygen, salinity, temperature, pH, chlorophyll and turbidity. Maintenance takes place on a monthly basis using one of SEPA's support vessels. Samples are mostly collected every 15 minutes, with occasional periods where a sample is collected every 30 minutes.

The water depth at the mooring ranges between 6 and 9 m depending on the tide.

More information may be found at the SEPA monitoring buoy network page for Inner Clyde Estuary.

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: SEPA_ICE

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: SEPA_ICE

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.