gov.noaa.nodc:0293811 eng utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NOAA Contact Information Information for contacts at NCEI. information custodian 2026-03-24T18:46:43Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Diel Assessment of Life in Lake Erie (DALLE): Physical, chemical, and biological water quality data collected from the R/V LAURENTIAN in western Lake Erie in the Great Lakes region from 2023-07-14 to 2023-07-25 (NCEI Accession 0293811) 2024-06-15 publication 2026-02-27 revision 2024-06-12 creation International DOI Foundation (IDF) 10.25921/0k84-g914 NOAA National Centers for Environmental Information gov.noaa.nodc:0293811 NCEI Archive Management System 0293811 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information publisher Lacey Mason NOAA Great Lakes Environmental Research Laboratory (GLERL) lacey.mason@noaa.gov http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information resourceProvider NOAA Great Lakes Environmental Research Laboratory (GLERL) http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information resourceProvider NOAA Great Lakes Environmental Research Laboratory (GLERL) NOAA GLERL Data Manager oar.glerl.data@noaa.gov http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information pointOfContact Reagan M. Errera NOAA Great Lakes Environmental Research Laboratory (GLERL) reagan.errera@noaa.gov http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information pointOfContact Godwin, Casey University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) cgodwin@umich.edu https://ciglr.seas.umich.edu/ HTTPS University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) website Institution web page information pointOfContact Boegehold, Anna G. Cooperative Institute for Great Lakes Research https://ciglr.seas.umich.edu/ HTTPS University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) website Institution web page information author Williams, Paige Cooperative Institute for Great Lakes Research https://ciglr.seas.umich.edu/ HTTPS University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) website Institution web page information author Schofield, Paris Cooperative Institute for Great Lakes Research https://ciglr.seas.umich.edu/ HTTPS University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) website Institution web page information author Zepernick, Brittany N. University of Tennessee author Martin, Robbie M. University of Tennessee author Johnson, Emma Cooperative Institute for Great Lakes Research https://ciglr.seas.umich.edu/ HTTPS University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) website Institution web page information author Cory, Rose M. University of Michigan author Chaganti, Subba Rao Cooperative Institute for Great Lakes Research https://ciglr.seas.umich.edu/ HTTPS University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) website Institution web page information author Spanbauer, Trisha L. University of Toledo http://www.utoledo.edu/ HTTP University of Toledo (UT) website Institution web page information author Wilhelm, Steven W. University of Tennessee author Godwin, Casey Cooperative Institute for Great Lakes Research https://ciglr.seas.umich.edu/ HTTPS University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) website Institution web page information author Errera, Reagan M. NOAA Great Lakes Environmental Research Laboratory http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information author Great Lakes Environmental Research Laboratory http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information author Cooperative Institute for Great Lakes Research https://ciglr.seas.umich.edu/ HTTPS University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) website Institution web page information author University of Michigan author NOAA Great Lakes Environmental Research Laboratory (GLERL) http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information contributor tableDigital Biological, physical, and chemical water quality data collected to assess diel patterns and short-term weather events during a sampling cruise aboard the R/V LAURENTIAN (R8001) from 2023-07-14 to 2023-07-25. These data were collected at several time points during each 24-hour period from the NOAA Great Lakes Environmental Research Laboratory’s (GLERL) western Lake Erie near master station WE12, approximately five miles north of Reno Beach, Ohio. Data for the following parameters are included: Secchi depth, CTD temperature, CTD specific conductivity, CTD beam attenuation, CTD transmission, CTD dissolved oxygen, CTD photosynthetically active radiation (PAR), CTD colored dissolved organic material absorbance at 400 nm (CDOM), CTD chlorophyll, turbidity, extracted phycocyanin, extracted chlorophyll-a, total phosphorus, total dissolved phosphorus, soluble reactive phosphorus, ammonia, nitrate + nitrite, total suspended solids, volatile suspended solids, Naperian CDOM, FDOM, hydrogen peroxide, total alkalinity, dissolved inorganic carbon, cyanotoxins, cyanobacterial DNA and RNA concentrations, and fluoroprobe casts . Any cells in a table with no value means there is no data available. 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 NA22OAR4320150) to support NOAA-GLERL’s operational development of the Lake Erie harmful algal bloom (HAB) forecasts and to directly monitor cyanobacteria harmful algal blooms within the ecosystem. We have conducted this discrete field sampling along with continuous field sampling, experimental work, and hydrodynamic-biological mechanistic modeling 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. Funding Agency: US Environmental Protection Agency completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information pointOfContact asNeeded NCEI Accession 0293811 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. https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0293811 Preview graphic PNG 0293811 NCEI ACCESSION NUMBER 2026-02-25 publication AMMONIA (NH3) Attenuation/Transmission BIOCHEMISTRY CHLOROPHYLL CHLOROPHYLL - EXTRACTED CHLOROPHYLL A Chromophoric Dissolved Organic Matter (CDOM) CONDUCTIVITY DEPTH - OBSERVATION DISSOLVED INORGANIC CARBON (DIC) DISSOLVED OXYGEN DNA nitrate + nitrite content (concentration) PHOSPHATE - SOLUBLE REACTIVE PHOTOSYNTHETIC ACTIVE RADIATION (PAR) Secchi depth suspended solids total alkalinity TOTAL PHOSPHORUS TOXIN turbidity WATER TEMPERATURE WEATHER theme NODC DATA TYPES THESAURUS CTD fluorometer nutrient autoanalyzer Secchi disk turbidity sensor instrument NODC INSTRUMENT TYPES THESAURUS chemical in situ laboratory analyses theme NODC OBSERVATION TYPES THESAURUS LAURENTIAN platform NODC PLATFORM NAMES THESAURUS NOAA Great Lakes Environmental Research Laboratory dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS NOAA Great Lakes Environmental Research Laboratory dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS Great Lakes place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication DOC/NOAA/OAR/GLERL > Great Lakes Environmental Research Laboratory, OAR, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 information custodian Great Lakes Restoration Initiative project Provider Project Names EARTH SCIENCE > AGRICULTURE > ANIMAL SCIENCE > ANIMAL PHYSIOLOGY AND BIOCHEMISTRY EARTH SCIENCE > BIOSPHERE > OMICS > BUILDING BLOCKS > DNA EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC MATTER EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SUSPENDED SOLIDS EARTH SCIENCE > OCEANS > OCEAN OPTICS > ATTENUATION/TRANSMISSION EARTH SCIENCE > OCEANS > OCEAN OPTICS > PHOTOSYNTHETICALLY ACTIVE RADIATION EARTH SCIENCE > OCEANS > OCEAN OPTICS > SECCHI DEPTH EARTH SCIENCE > OCEANS > OCEAN OPTICS > TURBIDITY EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 information custodian 16S DNA 16S RNA Anatoxin-A BEAM ATTENUATION CHLOROPHYLL A - extracted H202 Naperian absorption coefficient Particulate BMAA Particulate GTX2/3 Particulate anabaenopeptin-A Particulate anabaenopeptin-B Particulate anabaenopeptin-F Total dissolved phosphourus Volatile suspended solids chlorophyll-a from cryptophyta cyanobacteria diatoms dihydroanatoxin-A extracted phycocyanin mcy E-DNA nitrate + nitrite content particulate D_Asp3-LR particulate D_Asp3_Dhb7_RR particulate Dha-LR particulate GTX1/4 particulate MC HilR particulate homoanatoxin-A particulate microcystin particulate neosaxitoxin particulate saxitoxin sample depth (category) soluble reactive phosphorus total dissolved phosphorus total suspended solids volatile suspended solids weather yellow substances theme Provider Keywords AUTOANALYZER > AUTOANALYZER CTD > Conductivity, Temperature, Depth FLUOROMETERS > FLUOROMETERS SECCHI DISKS > SECCHI DISKS TURBIDITY METERS > TURBIDITY METERS instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 information custodian Hach 2100AN Turbidimeter SBE 19plus V2 SeaCAT Profiler CTD Seal QuAAtro or Seal AA3 Turner Designs 10-AU Fluorometer Turner Designs Aquafluor 8000-010 instrument Provider Instruments LAURENTIAN (ICES code: 33LA) platform ICES/SeaDataNet Ship Codes CONTINENT > NORTH AMERICA > CANADA > GREAT LAKES, CANADA CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > GREAT LAKES place Global Change Master Directory (GCMD) Location Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 information custodian 6GPUGB Send2NCEI Submission Package ID accessLevel: public otherRestrictions Cite as: Boegehold, Anna G.; Williams, Paige; Schofield, Paris; Zepernick, Brittany N.; Martin, Robbie M.; Johnson, Emma; Cory, Rose M.; Chaganti, Subba Rao; Spanbauer, Trisha L.; Wilhelm, Steven W.; Godwin, Casey; Errera, Reagan M.; Great Lakes Environmental Research Laboratory; Cooperative Institute for Great Lakes Research; University of Michigan (2024). Diel Assessment of Life in Lake Erie (DALLE): Physical, chemical, and biological water quality data collected from the R/V LAURENTIAN in western Lake Erie in the Great Lakes region from 2023-07-14 to 2023-07-25 (NCEI Accession 0293811). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/0k84-g914. Accessed [date]. 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. otherRestrictions 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. Boegehold, A. G., Burtner, A. M., Camilleri, A. C., Carter, G., DenUyl, P., Fanslow, D., Fyffe Semenyuk, D., Godwin, C. M., Gossiaux, D., Johengen, T. H., Kelchner, H., Kitchens, C., Mason, L. A., McCabe, K., Palladino, D., Stuart, D., Vanderploeg, H., & Errera, R. (2023). Routine monitoring of western Lake Erie to track water quality changes associated with cyanobacterial harmful algal blooms. Earth System Science Data, 15(8), 3853–3868. https://doi.org/10.5194/essd-15-3853-2023 2023-08-25 publication International DOI Foundation (IDF) https://doi.org/10.5194/essd-15-3853-2023 https://doi.org/10.5194/essd-15-3853-2023 HTTPS https://doi.org/10.5194/essd-15-3853-2023 related journal article information Boegehold, Anna G. author Burtner, Ashley M. author Camilleri, Andrew C. author Carter, Glenn author DenUyl, Paul author Fanslow, David author Fyffe Semenyuk, Deanna author Godwin, Casey M. author Gossiaux, Duane author Johengen, Thomas H. author Kelchner, Holly author Kitchens, Christine author Mason, Lacey A. author McCabe, Kelly author Palladino, Danna author Stuart, Dack author Vanderploeg, Henry Great Lakes Environmental Research Laboratory http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information author Errera, Reagan author Copernicus GmbH publisher documentDigital Earth Syst. Sci. Data 15(8) ISSN 1866-3516, pp. 3853-3868 crossReference sciencePaper NOAA National Centers for Coastal Ocean Science (2021). Experimental Harmful Algal Bloom (HAB) bulletin forecast products and associated satellite imagery from Lake Erie from 2008-09-04 to 2016-11-01 created by the NOAA National Centers for Coastal Ocean Science. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/q053-h813. 2021-08-17 publication International DOI Foundation (IDF) https://doi.org/10.25921/q053-h813 NOAA National Centers for Environmental Information gov.noaa.nodc:NOS-HABOFS-LakeErie-Experimental https://doi.org/10.25921/q053-h813 HTTPS https://doi.org/10.25921/q053-h813 Related dataset information NOAA National Centers for Coastal Ocean Science https://coastalscience.noaa.gov/ HTTPS NOAA National Centers for Coastal Ocean Science (NCCOS) website Institution web page information author NOAA National Centers for Environmental Information (NCEI) publisher tableDigital crossReference collection Cooperative Institute for Great Lakes Research, University of Michigan; NOAA Great Lakes Environmental Research Laboratory (2019). Physical, chemical, and biological water quality monitoring data to support detection of Harmful Algal Blooms (HABs) in western Lake Erie, collected by the Great Lakes Environmental Research Laboratory and the Cooperative Institute for Great Lakes Research since 2012. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/11da-3x54. 2019-04-24 publication International DOI Foundation (IDF) https://doi.org/10.25921/11da-3x54 NOAA National Centers for Environmental Information gov.noaa.nodc:GLERL-CIGLR-HAB-LakeErie-water-qual https://doi.org/10.25921/11da-3x54 HTTPS https://doi.org/10.25921/11da-3x54 Related dataset information Cooperative Institute for Great Lakes Research, University of Michigan https://ciglr.seas.umich.edu/ HTTPS University of Michigan Cooperative Institute for Great Lakes Research (CIGLR) website Institution web page information author NOAA Great Lakes Environmental Research Laboratory http://www.glerl.noaa.gov/ HTTP NOAA Great Lakes Environmental Research Laboratory (GLERL) website Institution web page information author NOAA National Centers for Environmental Information (NCEI) publisher tableDigital crossReference collection NOAA Great Lakes Environmental Research Laboratory: Great Lakes Harmful Algal Blooms (HABs) and Hypoxia 2016 publication https://www.glerl.noaa.gov/res/HABs_and_Hypoxia/ HTTPS https://www.glerl.noaa.gov/res/HABs_and_Hypoxia/ Program website information NOAA Great Lakes Environmental Research Laboratory publisher documentDigital crossReference program eng; USA utf8 environment oceans climatologyMeteorologyAtmosphere -83.3 -83.2 41.7 41.8 2023-07-14 2023-07-25 In this accession, NCEI has archived multiple versions of these data. The latest (and best) version of these data has the largest version number. NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov pointOfContact 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. Contact NCEI for other distribution options and instructions. CSV 12.356 https://doi.org/10.25921/0k84-g914 HTTPS Web browser NCEI Dataset Landing Page Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/oas/293811 HTTPS Web browser Descriptive Information Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/download/293811 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0003/0293811/ FTP Any FTP client FTP 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). download dataset NCEI Accession 0293811 v1.1 was published. 2024-06-15T05:26:41Z NCEI Accession 0293811 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0293811/1.1 HTTPS NCEI Accession 0293811 v1.1 published 2024-06-15T05:26:41Z download NCEI Accession 0293811 was revised and v2.2 was published. 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. 2026-02-27T16:19:02Z NCEI Accession 0293811 v2.2 publication https://www.ncei.noaa.gov/archive/accession/0293811/2.2 HTTPS NCEI Accession 0293811 v2.2 published 2026-02-27T16:19:02Z download dataset Parameter or Variable: SECCHI DEPTH (measured); Units: meters; Observation Category: in situ; Sampling Instrument: secchi disk; Data Quality Method: Expert review 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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. asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian CTD CTD Conductivity-Temperature-Depth probe fluorometer fluorometer fluorometer nutrient autoanalyzer nutrient autoanalyzer Laboratory Instrument Nutrient Autoanalyzer is a generic term describing an automated flow-thru system used to conduct analyses of several different nutrients (nitrate, ammonium, orthophosphate, and silicate) simultaneously from a seawater sample. For example: SEAL AutoAnalyzer 3 HR Continuous Segmented Flow Analyzer Secchi disk Secchi disk 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] turbidity sensor turbidity sensor Measures the turbidity of water Turbidity sensors measure the amount of light that is scattered by suspended solids in a liquid, such as water. When the concentration of total suspended solids (TSS) and total dissolved solids (TDS) in a liquid increase, the turbidity also increases. LAURENTIAN LAURENTIAN