Physical, chemical, and biological water quality data collected from a small boat in Saginaw Bay, Lake Huron, Great Lakes from 2012-06-07 to 2018-10-03 (NCEI Accession 0189250)
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title: Physical, chemical, and biological water quality data collected from a small boat in Saginaw Bay, Lake Huron, Great Lakes from 2012-06-07 to 2018-10-03 (NCEI Accession 0189250)
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abstract: Physical, chemical, and biological water quality data from Saginaw Bay, Lake Huron collected between 2012 and 2018. These data were collected during repeated trips to a set of stations before, during, and after harmful algal blooms (HABs). Data for the following parameters are included, Secchi depth, CTD temperature, CTD specific conductivity, CTD beam attenuation, CTD transmission, CTD dissolved oxygen, CTD phytosynthetically active radiation, turbidity, particulate microcystin, dissolved microcystin, extracted phycocyanin, extracted phycocyanin, extracted chlorophyll-a, total phosphorus, total dissolved phosphorus, soluble reactive phosphorus, ammonia, nitrate + nitrite, urea, particulate organic carbon, particulate organic nitrogen, dissolved organic carbon, colored dissolved organic material absorbance at 400 nm, total suspended solids, and volatile suspended solids. Table cells with no value means no data available.
purpose: These data were collected by the National Oceanic and Atmospheric Administration Great Lakes Environmental Research Laboratory (NOAA-GLERL) and the Cooperative Institute for Great Lakes Research (CIGLR) (NOAA Cooperative Agreement NA17OAR4320152) to support NOAA-GLERL’s operational development of the Saginaw Bay harmful algal bloom (HAB) forecasts and to directly monitor microcystin concentrations within the ecosystem. We have conducted this discrete field sampling to ensure development of useful tools and technology for local managers, interfacing with end users- facilitating the translation of research into more effective decision-making and public education.
credit: Related Funding Agency: US Environmental Protection Agency
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organisationName: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA)
contactInfo: (CI_Contact)
address: (CI_Address)
city: Greenbelt
administrativeArea: MD
onlineResource: (CI_OnlineResource)
linkage: https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
protocol: HTTPS
name: GCMD Keyword Forum Page
description: Global Change Master Directory (GCMD). 2023. GCMD Keywords, Version 17. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords
function: (CI_OnLineFunctionCode) information
role: (CI_RoleCode) custodian
descriptiveKeywords: (MD_Keywords)
keyword: Lake Huron
keyword: Saginaw Bay
type: (MD_KeywordTypeCode) place
thesaurusName: (CI_Citation)
title: Provider Place Names
date: (inapplicable)
resourceConstraints: (MD_Constraints)
useLimitation: accessLevel: Public
resourceConstraints: (MD_LegalConstraints)
useConstraints: (MD_RestrictionCode) otherRestrictions
otherConstraints: Cite as: Burtner, Ashley; Palladino, Danna; Kitchens, Christine; Fyffe, Deanna; Johengen, Tom; Stuart, Dack; Cooperative Institute for Great Lakes Research, University of Michigan; Fanslow, David; Gossiaux, Duane; National Oceanic and Atmospheric Administration; Great Lakes Environmental Research Laboratory (2019). Physical, chemical, and biological water quality data collected from a small boat in Saginaw Bay, Lake Huron, Great Lakes from 2012-06-07 to 2018-10-03 (NCEI Accession 0189250). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0189250. Accessed [date].
resourceConstraints: (MD_LegalConstraints)
useLimitation: Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
resourceConstraints: (MD_LegalConstraints)
accessConstraints: (MD_RestrictionCode) otherRestrictions
otherConstraints: Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
aggregationInfo: (MD_AggregateInformation)
aggregateDataSetName: (CI_Citation)
title: Physical, chemical, and biological water quality monitoring data to support detection of Harmful Algal Blooms (HABs) in Saginaw Bay, Lake Huron, Great Lakes collected by the Great Lakes Environmental Research Laboratory and the Cooperative Institute for Great Lakes Research since 2012
date: (CI_Date)
date: 2019-05-24
dateType: (CI_DateTypeCode) publication
identifier: (MD_Identifier)
authority: (CI_Citation)
title: NOAA National Centers for Environmental Information
date: (inapplicable)
code: gov.noaa.nodc:GLERL-CIGLR-HAB-SagBay-water-qual
citedResponsibleParty: (CI_ResponsibleParty)
positionName: (unknown)
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/GLERL-CIGLR-HAB-SagBay-water-qual
protocol: HTTPS
name: NCEI Collection
description: Navigate directly to the URL for data access and direct download.
function: (CI_OnLineFunctionCode) information
role: (unknown)
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
role: (CI_RoleCode) publisher
associationType: (DS_AssociationTypeCode) largerWorkCitation
initiativeType: (DS_InitiativeTypeCode) collection
language:
LanguageCode: eng; USA
characterSet: (MD_CharacterSetCode) utf8
topicCategory: (MD_TopicCategoryCode) environment
topicCategory: (MD_TopicCategoryCode) oceans
extent: (EX_Extent)
geographicElement: (EX_GeographicBoundingBox)
westBoundLongitude: -83.9087
eastBoundLongitude: -83.1
southBoundLatitude: 43.5
northBoundLatitude: 44.23
temporalElement: (EX_TemporalExtent)
extent:
TimePeriod:
beginPosition: 2012-06-07
endPosition: 2018-10-03
supplementalInformation: Submission Package ID: UC413A In this accession, NCEI has archived multiple versions of these data. The latest (and best) version of these data has the largest version number.
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distributionInfo: (MD_Distribution)
distributor: (MD_Distributor)
distributorContact: (CI_ResponsibleParty)
organisationName:
Anchor: https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1730 NOAA National Centers for Environmental Information
contactInfo: (CI_Contact)
phone: (CI_Telephone)
voice: +1-301-713-3277
address: (CI_Address)
electronicMailAddress: NCEI.Info@noaa.gov
role: (CI_RoleCode) pointOfContact
distributionOrderProcess: (MD_StandardOrderProcess)
fees: In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
orderingInstructions: Contact NCEI for other distribution options and instructions.
distributorFormat: (MD_Format)
name: Originator data format
version: (unknown)
distributorTransferOptions: (MD_DigitalTransferOptions)
transferSize:
Real: 1.076
onLine: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/0189250
protocol: HTTPS
applicationProfile: Web browser
name: NCEI Dataset Landing Page
description: Navigate directly to the URL for a descriptive web page with download links.
function: (CI_OnLineFunctionCode) information
onLine: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/oas/189250
protocol: HTTPS
applicationProfile: Web browser
name: Descriptive Information
description: Navigate directly to the URL for a descriptive web page with download links.
function: (CI_OnLineFunctionCode) information
onLine: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/download/189250
protocol: HTTPS
applicationProfile: Web browser
name: HTTPS
description: Navigate directly to the URL for data access and direct download.
function: (CI_OnLineFunctionCode) download
onLine: (CI_OnlineResource)
linkage: ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0137/0189250/
protocol: FTP
applicationProfile: Any FTP client
name: FTP
description: These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).
function: (CI_OnLineFunctionCode) download
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) dataset
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: NCEI Accession 0189250 v1.1 was published.
dateTime:
DateTime: 2019-05-24T13:56:17Z
output: (LE_Source)
sourceCitation: (CI_Citation)
title: NCEI Accession 0189250 v1.1
date: (CI_Date)
date: (inapplicable)
dateType: (CI_DateTypeCode) publication
citedResponsibleParty: (CI_ResponsibleParty)
individualName: (inapplicable)
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/0189250/1.1
protocol: HTTPS
name: NCEI Accession 0189250 v1.1
description: published 2019-05-24T13:56:17Z
function: (CI_OnLineFunctionCode) download
role: (inapplicable)
processStep: (LE_ProcessStep)
description: NCEI Accession 0189250 was revised and v2.2 was published.
rationale: Updates were received for this dataset. These updates were copied into the data/0-data/ directory of this accession. These updates may provide additional files or replace obsolete files. This version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession.
dateTime:
DateTime: 2020-03-26T11:40:22Z
output: (LE_Source)
sourceCitation: (CI_Citation)
title: NCEI Accession 0189250 v2.2
date: (CI_Date)
date: (inapplicable)
dateType: (CI_DateTypeCode) publication
citedResponsibleParty: (CI_ResponsibleParty)
individualName: (inapplicable)
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/0189250/2.2
protocol: HTTPS
name: NCEI Accession 0189250 v2.2
description: published 2020-03-26T11:40:22Z
function: (CI_OnLineFunctionCode) download
role: (inapplicable)
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) dataset
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: Parameter or Variable: SECCHI DEPTH (measured); Units: meters; Observation Category: in situ; Sampling Instrument: secchi disk; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: TEMPERATURE - WATER - CONTINUOUS MEASUREMENT [WATER TEMPERATURE] (measured); Units: degrees Celsius; Observation Category: in situ; Sampling Instrument: SBE 19plus V2 SeaCAT Profiler CTD; Sampling and Analyzing Method: Conductivity, temperature, and depth sensor (CTD) data was collected by allowing the sensors to stabilize underwater, bringing the instrument to the surface, and then dropping it slowly. Values reported are the mean of all recorded values ±0.5m of the sample depth from the downcast of the instrument.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: CONDUCTIVITY (measured); Units: micro Siemens per centimeter; Observation Category: in situ; Sampling Instrument: SBE 19plus V2 SeaCAT Profiler CTD; Sampling and Analyzing Method: Conductivity, temperature, and depth sensor (CTD) data was collected by allowing the sensors to stabilize underwater, bringing the instrument to the surface, and then dropping it slowly. Values reported are the mean of all recorded values ±0.5m of the sample depth from the downcast of the instrument.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: BEAM ATTENUATION (measured); Units: m^-1; Observation Category: in situ; Sampling Instrument: SBE 19plus V2 SeaCAT Profiler CTD; Sampling and Analyzing Method: Conductivity, temperature, and depth sensor (CTD) data was collected by allowing the sensors to stabilize underwater, bringing the instrument to the surface, and then dropping it slowly. Values reported are the mean of all recorded values ±0.5m of the sample depth from the downcast of the instrument.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: Attenuation/Transmission (measured); Units: percent; Observation Category: in situ; Sampling Instrument: SBE 19plus V2 SeaCAT Profiler CTD; Sampling and Analyzing Method: Conductivity, temperature, and depth sensor (CTD) data was collected by allowing the sensors to stabilize underwater, bringing the instrument to the surface, and then dropping it slowly. Values reported are the mean of all recorded values ±0.5m of the sample depth from the downcast of the instrument.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: DISSOLVED OXYGEN (measured); Units: milligrams per liter; Observation Category: in situ; Sampling Instrument: SBE 19plus V2 SeaCAT Profiler CTD; Sampling and Analyzing Method: Conductivity, temperature, and depth sensor (CTD) data was collected by allowing the sensors to stabilize underwater, bringing the instrument to the surface, and then dropping it slowly. Values reported are the mean of all recorded values ±0.5m of the sample depth from the downcast of the instrument.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: RADIATION - PHOTOSYNTHETICALLY ACTIVE [PHOTOSYNTHETIC ACTIVE RADIATION (PAR)] (measured); Units: micro Einsteins per meter^2 per second; Observation Category: in situ; Sampling Instrument: SBE 19plus V2 SeaCAT Profiler CTD; Sampling and Analyzing Method: Conductivity, temperature, and depth sensor (CTD) data was collected by allowing the sensors to stabilize underwater, bringing the instrument to the surface, and then dropping it slowly. Values reported are the mean of all recorded values ±0.5m of the sample depth from the downcast of the instrument.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: turbidity (measured); Units: NTU; Observation Category: laboratory analysis; Sampling Instrument: Hach 2100AN Turbidimeter; Sampling and Analyzing Method: Turbidity was measured immediately after returning samples to the lab using a benchtop Hach turbidimeter.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: particulate mycrosystin (measured); Units: microgram/liter; Observation Category: laboratory analysis; Sampling Instrument: Abraxis ELISA kit; Sampling and Analyzing Method: Two replicates for particulate microcystin (MC) were filtered onto Whatman GF/F filters (2012-2015) or Isopore membrane filters (2016-2018). Filters were placed in 70:30 methanol:water, sonicated, and toxins extracted for 12 hours at -20C (2012-2015) After removing the solvent extract, extraction was repeated twice again for an hour (2012-2015). Alternatively, toxins were extracted using commercially available Abraxis QuikLyse kits (2016-2018). Microcystin were quantified using commercial-available Abraxis ELISA kits.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: dissolved microcystin (measured); Units: microgram/liter; Observation Category: laboratory analysis; Sampling Instrument: Abraxis ELISA kit; Sampling and Analyzing Method: Two replicates for particulate microcystin were filtered through a 0.22 µm nylon filter and quantified using commercial available Abraxis ELISA kits.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: extracted phycocyanin (measured); Units: microgram/liter; Observation Category: laboratory analysis; Sampling Instrument: Turner Designs Aquafluor 8000-010; Sampling and Analyzing Method: Phycocyanin was measured in triplicate by filtering by concentrating samples onto 47-mm GF/F Whatman Glass Fiber filters. Phosphate buffer was added and samples were extracted using freeze/thaw cycles and sonication. Samples were read on a Turner Aquafluor.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: CHLOROPHYLL A - extracted (measured); Units: microgram/liter; Observation Category: laboratory analysis; Sampling Instrument: Turner Designs 10-AU Fluorometer; Sampling and Analyzing Method: Chlorophyll α was measured in duplicate by concentrating lake water particulates on a 47-mm GF/F filter and performing a dimethylformamide extraction. Samples were read on a Turner 10AU Fluorometer.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: TOTAL PHOSPHORUS (measured); Units: microgram/liter; Observation Category: laboratory analysis; Sampling Instrument: Seal QuAAtro or Seal AA3; Sampling and Analyzing Method: Total phosphorus was measured in duplicate after digesting 50 mL of unfiltered lake water with potassium persulfate in an autoclave for 30 min. Concentrations were determined using the standard molybdate/ascorbic acid method on either a Seal QuAAtro or AA3.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: total dissolved phosphorus (measured); Units: microgram/liter; Observation Category: laboratory analysis; Sampling Instrument: Seal QuAAtro or Seal AA3; Sampling and Analyzing Method: Total dissolved phosphorus was measured in duplicate by filtering 20 mL of lake water through a pre-rinsed 0.2-um Nucleopore filter and digesting with potassium persulfate in an autoclave for 30 min. Concentrations were determined using the standard molybdate/ascorbic acid method on either a Seal QuAAtro or AA3.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: soluble reactive phosphorus (measured); Units: microgram/liter; Observation Category: laboratory analysis; Sampling Instrument: Seal QuAAtro or Seal AA3; Sampling and Analyzing Method: Soluble reactive phosphorus was measured in duplicate by filtering 12 mL of lake water through a pre-rinsed 0.2-um Nucleopore filter. Concentrations were determined using the standard molybdate/ascorbic acid method on either a Seal QuAAtro or AA3.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: AMMONIA (NH3) (measured); Units: microgram/liter; Observation Category: laboratory analysis; Sampling Instrument: Seal QuAAtro or Seal AA3; Sampling and Analyzing Method: Ammonia was measured in duplicate by filtering 12 mL of lake water through a pre-rinsed 0.2-um Nucleopore filter. Concentrations were determined using the standard Bertholet reaction on either a Seal QuAAtro or AA3.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: nitrate + nitrite content (measured); Units: milligrams/liter; Observation Category: laboratory analysis; Sampling Instrument: Seal QuAAtro or Seal AA3; Sampling and Analyzing Method: Nitrate + Nitrite was measured in duplicate by filtering 12 mL of lake water through a pre-rinsed 0.2-um Nucleopore filter. Concentrations were determined using the standard cadmium reduction method on either a Seal QuAAtro or AA3.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: UREA (measured); Units: microgram/liter; Observation Category: laboratory analysis; Sampling Instrument: Perkin Elmer UV/VIS spectrophotometer Lambda 35; Sampling and Analyzing Method: Urea was measured using duplicate sample aliquots which were filtered through a pre-rinsed 0.2-um Nucleopore filter. Samples were analyzed on a Perkin Elmer spectrophotometer using the direct spectrophotometric method modified to use a single mixed reagent; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: PARTICULATE ORGANIC CARBON (measured); Units: milligrams/liter; Observation Category: laboratory analysis; Sampling Instrument: Carlo-Erba model 1110 CHN Elemental Analyzer; Sampling and Analyzing Method: Samples for particulate organic carbon were processed in duplicate by filtering lake water through pre-combusted GF/F filters. Filters were acidified with 10 % HCL, and dried at 70⁰ C for 24 hours, and measured with a Perkin Elmer CHN elemental analyzer.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: PARTICULATE ORGANIC NITROGEN (PON) (measured); Units: milligrams/liter; Observation Category: laboratory analysis; Sampling Instrument: Carlo-Erba model 1110 CHN Elemental Analyzer; Sampling and Analyzing Method: Samples for particulate organic nitrogen were processed in duplicate by filtering lake water through pre-combusted GF/F filters. Filters were acidified with 10 % HCL, and dried at 70⁰ C for 24 hours, and measured with a Perkin Elmer CHN elemental analyzer.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: DISSOLVED ORGANIC CARBON (measured); Units: milligrams/liter; Observation Category: laboratory analysis; Sampling Instrument: Shimadzu TOC-5000 Total Organic Carbon Analyzer; Sampling and Analyzing Method: Samples for dissolved organic carbon were processed by filtering lake water through pre-combusted GFF filters. The filtrate was acidified with HCL and sparged with air for 6 minutes. Dissolved organic carbon was determined using a Shimadzu total organic carbon analyzer.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: colored dissolved organic material absorbance at 400nm (measured); Units: meter^-1; Observation Category: laboratory analysis; Sampling Instrument: Perkin Elmer UV/VIS spectrophotometer Lambda 35; Sampling and Analyzing Method: Colored dissolved organic material (CDOM) was processed by filtering lake water through an acid-rinsed Nucleopore polycarbonate filter into an acid-washed and combusted borosilicate vial. CDOM was analyzed on a Perkin Elmer spectrophotometer within a week.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: total suspended solids (measured); Units: milligrams/liter; Observation Category: laboratory analysis; Sampling Instrument: n/a; Sampling and Analyzing Method: Total Suspended Solids were determined gravimetrically by concentrating lake water on a pre-combusted, pre-weighed GF/F filter. The filters were dried at 60° C for at least 24 hours and then reweighed.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: volatile suspended solids (measured); Units: milligrams/liter; Observation Category: laboratory analysis; Sampling Instrument: n/a; Sampling and Analyzing Method: Volatile Suspended Solids were determined by combusting total suspended solids filters at 450 °C and calculating the mass lost.; Data Quality Method: Expert review.
processStep: (LE_ProcessStep)
description: Parameter or Variable: sample depth (category) (measured); Units: categorical description; Observation Category: in situ; Sampling Instrument: n/a; Sampling and Analyzing Method: Scum, surface, mid, or bottom sampling depth. Scum indicates sampling in top ~10 cm of water column; surface indicates sample from ~50 cm of of water depth..
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded
maintenanceNote: Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
maintenanceNote: NCEI Accession 0189250 was revised and a new version of the archival package was published. Updates to existing archival packages may provide additional files or replace obsolete files. The latest version contains the most complete and up-to-date representation of this archival information package. All of the files received prior to this update are available in the preceding version of this accession. Please see journal.txt in the /about directory for additional details on changes made.
contact: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
role: (CI_RoleCode) custodian
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acquisitionInformation: (MI_AcquisitionInformation)
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: Secchi disk
type: Secchi disk
description: The Secchi disk (or Secchi disc), as created in 1865 by Angelo Secchi, is a plain white, circular disk 30 cm (12 in) in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line, and lowered slowly down in the water. The depth at which the disk is no longer visible is taken as a measure of the transparency of the water. This measure is known as the Secchi depth and is related to water turbidity. [Wikipedia, 2021-09-02]
