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Metadata Report for BODC Series Reference Number 1778423


Metadata Summary

Data Description

Data Category Hydrography time series at depth
Instrument Type
NameCategories
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 1778423
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2013-07-02 15:30
End Time (yyyy-mm-dd hh:mm) 2013-08-06 12:30
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 CODERankUnitsTitle
AADYAA011DaysDate (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ011DaysTime (time between 00:00 UT and timestamp)
ACYCAA011DimensionlessSequence number
CPHLZZXX1Milligrams per cubic metreConcentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >unknown phase]
DOXYZZ011Micromoles per litreConcentration of oxygen {O2 CAS 7782-44-7} per unit volume of the water body [dissolved plus reactive particulate phase] by in-situ sensor
ODSDM0211Parts per thousandSalinity of the water body
OXYSZZ011PercentSaturation of oxygen {O2 CAS 7782-44-7} in the water body [dissolved plus reactive particulate phase]
PHXXZZXX1pH unitspH (unspecified scale) of the water body
TEMPPR011Degrees CelsiusTemperature of the water body
TURBXXXX1Nephelometric Turbidity UnitsTurbidity 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 oxygena
% 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 oxygena
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
Conductivityc 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/nitrogenb 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/ammoniab 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
Chlorideb 0 to 1000 mg/L 0.001 to 1 mg/L ±15% of reading or 5 mg/L, (range dependent) whichever is greater
Turbiditya 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 WTa 0-200 µg/L 0.1 µg/L ±5% of reading or ±1 µg/L, whichever is greater
Chlorophylla
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 algaea,e
phycocyanin
Range Resolution Linearity
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 algaea,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 SJM20130702
Departure Date 2013-07-02
Arrival Date 2013-07-02
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

Fixed Station Information

Station NameSEPA_LochStriven
CategoryCoastal location
Latitude55° 57.52' N
Longitude5° 5.46' W
Water depth below MSL25.0 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

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

Flag Description
0 no quality control
1 good value
2 probably good value
3 probably bad value
4 bad value
5 changed value
6 value below detection
7 value in excess
8 interpolated value
9 missing value
A value phenomenon uncertain
B nominal value
Q value below limit of quantification

Appendix 1: SEPA_LochStriven

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.

Series IdentifierData CategoryStart date/timeStart positionCruise
1778379Hydrography time series at depth2013-01-01 00:01:0055.9586 N, 5.09104 WNot applicable
1778380Hydrography time series at depth2013-02-12 11:30:0055.9586 N, 5.09104 WSir John Murray SJM20130212
1778392Hydrography time series at depth2013-03-11 10:16:0055.9586 N, 5.09104 WSir John Murray SJM20130311
1778411Hydrography time series at depth2013-05-27 13:00:0055.9586 N, 5.09104 WSir John Murray SJM20130527
1778435Hydrography time series at depth2013-08-06 13:00:0055.9586 N, 5.09104 WSir John Murray SJM20130806
1778447Hydrography time series at depth2013-09-09 11:00:0055.9586 N, 5.09104 WSir John Murray SJM20130909
1778459Hydrography time series at depth2013-10-28 12:31:0055.9586 N, 5.09104 WSir John Murray SJM20131028