Metadata Report for BODC Series Reference Number 1778459

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

Hydrography time series at depth

Instrument Type

Name	Categories
YSI 6-series multiparameter water quality sondes	sea level recorders; fluorometers; radiometers; optical backscatter sensors; water temperature sensor; nutrient analysers; salinity sensor; dissolved gas sensors; pH sensors; redox potential sensors

Instrument Mounting

null

Originating Country

United Kingdom

Originator

Dr Matthew Blackburn

Originating Organization

Scottish Environment Protection Agency, Edinburgh

Processing Status

QC in progress

Online delivery of data

Download not available

Project(s)

Data Identifiers

Originator's Identifier	SEPA_LOCH_STRIVEN_BODC_2013_GMT_DEC14_RESUBMISSION
BODC Series Reference	1778459

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm)	2013-10-28 12:31
End Time (yyyy-mm-dd hh:mm)	2013-12-11 11:01
Nominal Cycle Interval	1800.0 seconds

Spatial Co-ordinates

Latitude	55.95860 N ( 55° 57.5' N )
Longitude	5.09104 W ( 5° 5.5' W )
Positional Uncertainty	0.0 to 0.01 n.miles
Minimum Sensor or Sampling Depth	0.37 m
Maximum Sensor or Sampling Depth	0.37 m
Minimum Sensor or Sampling Height	24.63 m
Maximum Sensor or Sampling Height	24.63 m
Sea Floor Depth	25.0 m
Sea Floor Depth Source	CRREP
Sensor or Sampling Distribution	Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor or Sampling Depth Datum	Approximate - Depth is only approximate
Sea Floor Depth Datum	Approximate - Depth is only approximate

Parameters

BODC CODE	Rank	Units	Title
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
CPHLZZXX	1	Milligrams per cubic metre	Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >unknown phase]
DOXYZZ01	1	Micromoles per litre	Concentration of oxygen {O2 CAS 7782-44-7} per unit volume of the water body [dissolved plus reactive particulate phase] by in-situ sensor
OXYSZZ01	1	Percent	Saturation of oxygen {O2 CAS 7782-44-7} in the water body [dissolved plus reactive particulate phase]
PHXXZZXX	1	pH units	pH (unspecified scale) of the water body
TEMPPR01	1	Degrees Celsius	Temperature of the water body
TURBXXXX	1	Nephelometric Turbidity Units	Turbidity of water in the water body

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

Loch Striven 2013 Mooring Quality Report

Screening and Quality Control

Data have had quality control applied by the Scottish Environment Protection Agency (SEPA) with suspect data being removed. Data then went through BODC quality control procedure where suspect data are flagged but not removed.

There are a few periods through the data where power failure has occurred. These breaks in the data occur between 15 January 2013 to 12 February 2013 and 08 April 2013 to 27 May 2013. The data also ends on the 11 December 2013 rather than at the end of the year.

During screening CPHLZZXX, ODSDM021 and TURBXXXX were variable channels with any obvious spikes looked at in closer detail. However, these spikes were generally left unflagged due to the quality control and expertise applied by SEPA.

There are instances in the data were a channel is null for a period of time due to SEPA quality control removing suspect data. These null periods have been removed from the data in the following channels:

ODSDM021 between 28 October 2013 and 11 December 2013
PHXXZZXX between 01 January 2013 and 27 May 2013

TURBXXXX

There are points where TURBXXXX drops to zero NTU throughout the data but as TURBXXXX is so low during these periods, these points have not been flagged as suspect. However, TURBXXXX was zero NTU for a continual period from 28 October 2013 to 11 December 2013 and so the period has been flagged suspect as it was not deemed it was likely to be zero for a considerable period.

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

Features/Parameters	V2 Sondes					600 Sondes				Drinking Water		System
	6600	6600EDS	6920	6820	600OMS	600R	600XL	600XLM	600LS	6920DW	600DW-B	600QS
Field-replaceable probes	S	S	S	S	S		S	S		S	S
RS-232 and SDI-12 standard	S	S	S	S	S	S	S	S	S	S	S	S
Fits 2" wells					S	S	S	S	S		S	S
Internal memory	S	S	S	S	S	S	S	S	S	S	S	S
Internal power (batteries)	S	S	S		CS			S	CS	S	S
Flow cell	CS	SO	CS	CS		CS	CS	CS		CS	CS	CS
Ammonium/ammonia^*	I		CS	CS			SO	SO
Blue green algae	CS	CS	CS	CS	CS		R1	R1
Chloride^*	I		CS	CS			SO	SO
Chlorophyll	CS	CS	CS	CS	CS		R1	R1
Conductivity	S	S	S	S	S	S	S	S	CS	S	S	S
Depth	CS	CS	CS	CS	CS		CS	CS				CS
Dissolved oxygen	I	CS	R2	R2		CS	CS	CS				CS
Dissolved oxygen, optical	CS	CS	CS	CS	CS		R1	R1
Free chlorine										CS	CS
Nitrate^*	I		CS	CS			SO	SO
Open channel flow^**	CS	CS	CS	CS	CS		CS	CS	S
ORP	CS	CS	CS	CS			CS	CS		CS	CS	CS
PAR (Photosynthetically Active Radiation)	I	I
pH	CS	CS	CS	CS		CS	CS	CS		CS	CS	CS
Resistivity^**	S	S	S	S	S	S	S	S	CS	S	S	S
Rhodamine	CS	CS	CS	CS	CS		R1	R1
Salinity	S	S	S	S	S	S	S	S	CS	S	S	S
Specific conductance^**	S	S	S	S	S	S	S	S	CS	S	S	S
Temperature	S	S	S	S	S	S	S	S	S	S	S	S
Total dissolved solids^**	S	S	S	S	S	S	S	S	CS	S	S	S
Turbidity	CS	CS	CS	CS	CS		R1	R1		CS
Vented level	CS	CS	CS	CS	CS		CS	CS	S

^*Freshwater only^**Calculated parameters

Where
S	=	Standard
CS	=	Customer Selectable
SO	=	Special Order
R1	=	Available only on 600XL V2 or 600XLM V2
R2	=	Available on 6920 V2-1 or 6820 V2-1
I	=	Available only on 6600 V2-2

Sensor Specifications

	Range	Resolution	Accuracy
Rapid Pulse dissolved oxygen % air saturation	0 to 500%	0.1%	0 to 200%: ±2% of reading or 2% air saturation saturation, whichever is greater; 200 to 500%: ±6% of reading
Rapid Pulse dissolved oxygen mg/L	0 to 50 mg/L	0.01 mg/L	0 to 20 mg/L: ±2% of reading or 0.2 mg/L, mg/L whichever is greater; 20 to 50 mg/L: ±6% of reading
ROX optical dissolved oxygen^a % air saturation	0 to 500%	0.1%	0 to 200%: ±1% of reading or 1% air % air saturation saturation, whichever is greater; 200 to 500%: ±15% of reading; relative to calibration gases
ROX optical dissolved oxygen^a mg/L	0 to 50 mg/L	0.01 mg/L	0 to 20 mg/L: ±1% of reading or 0.1 mg/L, mg/L whichever is greater; 20 to 50 mg/L: ±15% of reading; relative to calibration gases
Conductivity^c	0 to 100 mS/cm	0.001 to 0.1 mS/cm	±0.5% of reading + 0.001 mS/cm (range-dependent)
Temperature	-5 to 50°C	0.01°C	±0.15°C
pH	0 to 14 units	0.01 unit	±0.2 unit
Shallow depth	0 to 9.1 m (0 to 30 ft)	0.001 m (0.001 ft)	±0.018 m (±0.06 ft)
Medium depth	0 to 61 m (0 to 200 ft)	0.001 m (0.001 ft)	±0.12 m (±0.4 ft)
Deep depth	0 to 200 m (0 to 656 ft)	0.001 m (0.001 ft)	±0.3 m (±1 ft)
Vented level	0 to 9.1 m (0 to 30 ft)	0.001 m (0.001 ft)	±0.003 m (?0.01 ft)
Open-channel flow	Calculated measurement, requires vented level
Free chlorine	0 to 3 mg/L	0.01 mg/L	±15% of reading or 0.05 mg/L, whichever is greater
ORP	-999 to +999 mV	0.1 mV	±20 mV in Redox standard solutions
Salinity	0 to 70 ppt	0.01 ppt	±1% of reading or 0.1 ppt, whichever is greater
Nitrate/nitrogen^b	0 to 200 mg/L-N	0.001 to 1 mg/L-N	±10% of reading or 2 mg/L, (range dependent) whichever is greater
Ammonium/ammonia^b	0 to 200 mg/L-N	0.001 to 1 mg/L-N	±10% of reading or 2 mg/L, nitrogen (range dependent) whichever is greater
Chloride^b	0 to 1000 mg/L	0.001 to 1 mg/L	±15% of reading or 5 mg/L, (range dependent) whichever is greater
Turbidity^a	0 to 1,000 NTU	0.1 NTU	±2% of reading or 0.3 NTU, whichever is greater in YSI AMCO-AEPA Polymer Standards
Rhodamine WT^a	0-200 µg/L	0.1 µg/L	±5% of reading or ±1 µg/L, whichever is greater
Chlorophyll^a
	Range	Resolution	Linearity
	0 to 400 µg/L chl a	0.1 µg/L chl a	R² > 0.9999 for serial dilution of Rhodamine
	0 to 100 RFU	0.1% FS; 0.1 RFU	WT solution from 0 to 500 µg/L
Blue-green algae^a,e phycocyanin	Range	Resolution	Linearity
Blue-green algae^a,e phycocyanin	0-280,000 cells/mL	220 cells/mL	R² = 0.9999 for serial dilution of Rhodamine WT from 0 to 400 µg/L
Blue-green algae^a,e phycoerythrin
Blue-green algae^a,e phycoerythrin	0-200,000 cells/mL	450 cells/mL	R² = 0.9999 for serial dilution of Rhodamine WT from 0 to 8 µg/L
PAR	Range	Calibration	Stability
	400-700 nm waveband	±5%	< ±2% change over 1 year
	Linearity	Sensitivity
	Max. deviation of 1%	Typically 3µA per 1000 mmol s^-1 m^-2 in water

^a Depth rating for optical probes is 61 m (200 ft); depth rating for anti-fouling optical probes with copper-alloy probe housing is 200 m (656 ft).

^b Freshwater only. Maximum depth rating of 15.2 m (50 ft).

^c Report outputs of specific conductance (conductivity correct to 25° C), resistivity, and total dissolved solids are also provided. These values are automatically calculated from conductivity according to algorithms found in Standard Methods for the Examination of Water and Wastewater (ed 1989).

^d To maintain accuracy specification, flow must be at least 500 mL/min and pH should not change by more than ±0.3 units if mean pH is between 8.5 and 9.3.

^e Specification determined using monocultures of Isochrysis sp. and fluorometric extraction of chlorophyll a. Actual detection limits will vary depending on natural algae assemblage.

^f Estimated from cultures of Microcystis aeruginosa.

^g Estimated from cultures of Synechococcus sp.

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 image

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:

Originator's Parameter	Originator's Units	BODC Parameter Code	BODC Units	Comments
Temp	deg C	TEMPPR01	°C
pH	pH Units	PHXXZZXX	pH Units
Salin	ppt	ODSDM021	ppt
DO%	% Sat	OXYSZZ01	%	For legacy data Oxygen saturation is not derived by BODC but taken from the data supplied.
DO	mg/l	DOXYZZ01	µmol/l	Conversion of * 31.252 was applied during transfer (Bittig et al., 2018)
Turb	NTU	TURBXXXX	NTU
Chl	µg/l	CPHLZZXX	mg/m³
Depth	m	PPSBPS01	m	Depth has been transferred for 2018 onwards, and is available on request for 2016 and 2017. Depth is not available for data previous to 2016.

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 Loch Striven long-term monitoring buoy

Data Acquisition and Analysis

Data were obtained from a YSI probe attached to a mooring deployed in Loch Striven, Firth of Clyde. The mooring was serviced and deployed by the Scottish Environment Protection Agency (SEPA) for the purpose of long-term monitoring. The raw data were downloaded directly from the instruments sometimes remotely. This initially caused problems as sometimes data strings would be overwritten if the function was set up incorrectly leading to one parameter being downloaded at the expense of another. Data were sent 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 reason for any missing data. This information is available upon request.

Submission

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

Project Information

No Project Information held for the Series

Data Activity or Cruise Information

Cruise

Cruise Name	SJM20131028
Departure Date	2013-10-28
Arrival Date	2013-10-28
Principal Scientist(s)	Matthew V Blackburn (Scottish Environment Protection Agency, Edinburgh)
Ship	Sir John Murray

Complete Cruise Metadata Report is available here

Fixed Station Information

Station Name	SEPA_LochStriven
Category	Coastal location
Latitude	55° 57.52' N
Longitude	5° 5.46' W
Water depth below MSL	25.0 m

SEPA Loch Striven Fixed Station Mooring

Location Name	Loch Stiven
Nominal Latitude (+ve N)	55.959
Nominal Longitude (+ve E)	-5.091
Water depth	25 m
Period of data collection

The buoy is located in Loch Striven and provides measurements of dissolved oxygen, salinity, temperature, pH, chlorophyll and turbidity. Maintenance takes place on an approximately monthly basis using one of SEPA's support vessels and is done in such a way as to prevent loss of information. This usually involves a change in the probe that is installed in the buoy, ensuring readings are continuous through time.

Samples are mostly collected every 30 minutes but there are periods where samples are collected every 15 minutes.

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:

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