gov.noaa.nodc:IOOS-MARACOOS eng utf8 series 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 2026-05-06T21:27:13Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Physical and meteorological data collected from non-federal stations assembled by the Mid-Atlantic Regional Association Coastal Ocean Observing Systems (MARACOOS) 2017-06-14 publication 2021-02-17 revision 2017-06-13 creation International DOI Foundation (IDF) 10.25921/cwjr-4p83 NOAA National Centers for Environmental Information gov.noaa.nodc:IOOS-MARACOOS 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 Kelly Knee Mid-Atlantic Regional Association Coastal Ocean Observing System (MARACOOS) Kelly.knee@rpsgroup.com https://maracoos.org/ HTTPS Mid-Atlantic Regional Association Coastal Ocean Observing System (MARACOOS) website Institution web page information resourceProvider Mid-Atlantic Regional Association Coastal Ocean Observing System (MARACOOS) https://maracoos.org/ HTTPS Mid-Atlantic Regional Association Coastal Ocean Observing System (MARACOOS) website Institution web page information resourceProvider Hudson River Environmental Conditions Observing System (HRECOS) http://www.hrecos.org/ HTTP Hudson River Environmental Conditions Observing System (HRECOS) website Institution web page information contributor Knee, Kelly Mid-Atlantic Regional Association Coastal Ocean Observing System (MARACOOS) Kelly.knee@rpsgroup.com https://maracoos.org/ HTTPS Mid-Atlantic Regional Association Coastal Ocean Observing System (MARACOOS) website Institution web page information author Mid-Atlantic Regional Association Coastal Ocean Observing System https://maracoos.org/ HTTPS Mid-Atlantic Regional Association Coastal Ocean Observing System (MARACOOS) website Institution web page information author tableDigital This dataset contains oceanographic and surface meteorological data collected from non-Federal stations throughout the mid-Atlantic region of the United States. The data is predominantly long time series at fixed moorings and buoys with a variety of instruments including CTDs, fluorometers, oxygen sensors, optical turbidity sensors, pH sensors, meteorological sensors, and water quality sensors. The data files are in netCDF format, following the Climate and Forecast metadata convention (CF) and the Attribute Convention for Data Discovery (ACDD). Mid-Atlantic Regional Association Coastal Ocean Observing Systems (MARACOOS), which assembles data from sub-regional coastal and ocean observing systems, submitted the data to NCEI as part of the Integrated Ocean Observing System Data Assembly Centers (IOOS DACs) Data Stewardship Program. This dataset is available to the public for a wide variety of uses including scientific research and analysis. onGoing 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 https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:IOOS-MARACOOS Preview graphic PNG 0163364 0163410 0163411 0163412 0163413 0163414 0163415 0163416 0163417 0163418 0163419 0163602 0163603 0163604 0163605 NCEI ACCESSION NUMBER 2019-08-07 publication AIR TEMPERATURE BAROMETRIC PRESSURE CHLOROPHYLL CONDUCTIVITY DEPTH - OBSERVATION dew point DISSOLVED OXYGEN INCOMING SOLAR RADIATION LATITUDE LONGITUDE OXYGEN - PERCENT SATURATION pH PRECIPITATION AMOUNT RELATIVE HUMIDITY SALINITY TEMPERATURE - SEDIMENT turbidity WATER LEVEL WATER TEMPERATURE WIND DIRECTION WIND GUST WIND SPEED theme NODC DATA TYPES THESAURUS anemometer barometer C-T recorder fluorometer humidity sensor meteorological sensor multi-parameter water quality sensor oxygen sensor PAR Sensor pH sensor rain gauge temperature probe temperature sensor turbidity sensor water level recorder instrument NODC INSTRUMENT TYPES THESAURUS biological chemical meteorological physical time series theme NODC OBSERVATION TYPES THESAURUS FIXED PLATFORM OF UNITED STATES platform NODC PLATFORM NAMES THESAURUS Hudson River Environmental Conditions Observing System dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS Mid-Atlantic Regional Association Coastal Ocean Observing System dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS Integrated Ocean Observing System (IOOS) Integrated Ocean Observing System Data Assembly Centers Data Stewardship Program project NODC PROJECT NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication IOOS > Integrated Ocean Observing System, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2026 revision 23 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 IOOS > Integrated Ocean Observing System project Global Change Master Directory (GCMD) Project Keywords 2026 revision 23 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 EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > ATMOSPHERIC PRESSURE MEASUREMENTS EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > SEA LEVEL PRESSURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > STATIC PRESSURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC RADIATION > INCOMING SOLAR RADIATION EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE > AIR TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE > DEW POINT TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR INDICATORS > DEW POINT TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR INDICATORS > HUMIDITY EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WATER VAPOR > WATER VAPOR INDICATORS > HUMIDITY > RELATIVE HUMIDITY EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS > WIND DIRECTION EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS > WIND SPEED EARTH SCIENCE > ATMOSPHERE > PRECIPITATION > LIQUID PRECIPITATION > RAIN EARTH SCIENCE > ATMOSPHERE > PRECIPITATION > PRECIPITATION AMOUNT EARTH SCIENCE > BIOSPHERE > VEGETATION > PHOTOSYNTHETICALLY ACTIVE RADIATION EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH EARTH SCIENCE > OCEANS > OCEAN OPTICS > TURBIDITY EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY EARTH SCIENCE > OCEANS > SEA SURFACE TOPOGRAPHY > SEA SURFACE HEIGHT theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 23 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 air_pressure air_temperature depth dew_point_temperature fractional_saturation_of_oxygen_in_sea_water large_scale_rainfall_amount latitude longitude mass_concentration_of_chlorophyll_in_sea_water mass_concentration_of_oxygen_in_sea_water relative_humidity sea_water_electrical_conductivity sea_water_ph_reported_on_total_scale sea_water_salinity sea_water_temperature sea_water_turbidity soil_temperature surface_upwelling_photosynthetic_photon_flux_in_air thickness_of_rainfall_amount time water_surface_height_above_reference_datum wind_from_direction wind_speed wind_speed_of_gust theme NetCDF Climate and Forecast (CF) Metadata Convention Standard Names Agriculture > Soils > Soil Temperature Atmosphere > Atmospheric Pressure > Atmospheric Pressure Measurements Atmosphere > Atmospheric Pressure > Sea Level Pressure Atmosphere > Atmospheric Pressure > Static Pressure Atmosphere > Atmospheric Temperature > Air Temperature Atmosphere > Atmospheric Temperature > Dew Point Temperature Atmosphere > Atmospheric Temperature > Surface Air Temperature Atmosphere > Atmospheric Water Vapor > Dew Point Temperature Atmosphere > Atmospheric Water Vapor > Humidity Atmosphere > Atmospheric Winds > Surface Winds Atmosphere > Precipitation > Precipitation Amount Atmosphere > Precipitation > Rain Biosphere > Vegetation > Photosynthetically Active Radiation Land Surface > Soils > Soil Temperature Oceans > Ocean Chemistry > Chlorophyll Oceans > Ocean Chemistry > Oxygen Oceans > Ocean Chemistry > pH Oceans > Ocean Temperature > Water Temperature Oceans > Salinity/Density > Conductivity Oceans > Salinity/Density > Salinity Oceans > Sea Surface Topography > Sea Surface Height theme Provider Keywords ANEMOMETERS > ANEMOMETERS BAROMETERS > BAROMETERS CONDUCTIVITY METERS > CONDUCTIVITY METERS FLUOROMETERS > FLUOROMETERS HUMIDITY SENSORS > HUMIDITY SENSORS OXYGEN METERS > OXYGEN METERS PAR SENSORS > Photosynthetically Active Radiation Sensors PH METERS > PH METERS PRESSURE TRANSDUCERS > PRESSURE TRANSDUCERS RAIN GAUGES > RAIN GAUGES TEMPERATURE LOGGERS > TEMPERATURE LOGGERS TEMPERATURE PROBES > TEMPERATURE PROBES TEMPERATURE SENSORS > TEMPERATURE SENSORS THERMISTORS > THERMISTORS THERMOMETERS > THERMOMETERS TURBIDITY METERS > TURBIDITY METERS WATER LEVEL GAUGES > WATER LEVEL GAUGES WIND VANES > WIND VANES WL/CR > WATER LEVEL/CLIMATE RECORDERS instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 23 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 In Situ/Laboratory Instruments > Chemical Meters/Analyzers > OXYGEN METERS In Situ/Laboratory Instruments > Chemical Meters/Analyzers > PH METERS In Situ/Laboratory Instruments > Conductivity Sensors In Situ/Laboratory Instruments > Current/Wind Meters > WIND VANES In Situ/Laboratory Instruments > Gauges > RAIN GAUGES In Situ/Laboratory Instruments > Gauges > WATER LEVEL GAUGES In Situ/Laboratory Instruments > Photon/Optical Detectors > PAR SENSORS In Situ/Laboratory Instruments > Photon/Optical Detectors > TURBIDITY METERS In Situ/Laboratory Instruments > Pressure/Height Meters In Situ/Laboratory Instruments > Pressure/Height Meters > PRESSURE TRANSDUCERS In Situ/Laboratory Instruments > Probes > SOIL TEMPERATURE PROBE In Situ/Laboratory Instruments > Temperature/Humidity Sensors > Thermistors In Situ/Laboratory Instruments > Temperature/Humidity Sensors > Thermometers instrument Provider Instruments FIXED OBSERVATION STATIONS > FIXED OBSERVATION STATIONS OCEAN PLATFORMS platform Global Change Master Directory (GCMD) Platform Keywords 2026 revision 23 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 In Situ Ocean-based Platforms > OCEAN PLATFORM/OCEAN STATIONS platform Provider Platform Keywords Castle Point, NJ Center for the Urban River at Beczak HRALBP HRBZAK HRLCK8 HRMARPH HRMARPHS HRNOPT HRPIER84 HRPMNT HRPR26 HRPVSC HRREXBR HRSCHD HRUTICA HRWSTPTH Marist Pump Station Mohawk R. Lock 8 hydro/weather Mohawk R. Rexford Bridge Mohawk River at Ilion Norrie Point weather/hydro Passaic River, NJ Pier 26 Weather/Hydro Station Pier 84 hydro/weather Piermont Pier weather/hydro Port of Albany weather/hydro Pump Station STCPBY1 Schodack Island hydro/weather West Point platform Provider Platform Names Hudson River place Provider Place Names accessLevel: public otherRestrictions Cite as: Knee, Kelly; Mid-Atlantic Regional Association Coastal Ocean Observing System (2017). Physical and meteorological data collected from non-federal stations assembled by the Mid-Atlantic Regional Association Coastal Ocean Observing Systems (MARACOOS). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/cwjr-4p83. 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. Mid-Atlantic Regional Association Coastal Ocean Observing System (MARACOOS) 2023 publication https://maracoos.org/ HTTPS https://maracoos.org/ MARACOOS website information MARACOOS publisher documentDigital crossReference program eng; USA utf8 environment oceans climatologyMeteorologyAtmosphere -75.02847 -73.7581 40.71324 43.01975 2008-01-01 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. netCDF netCDF-4 ACDD-1.3, CF-1.6, NCEI_NetCDF_TimeSeries_Orthogonal_Template_v2.0 3739.072 https://doi.org/10.25921/cwjr-4p83 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/metadata/granule/geoportal/?from=0&size=10&esdsl=%7B%22query%22%3A%7B%22bool%22%3A%7B%22must%22%3A%5B%7B%22query_string%22%3A%7B%22analyze_wildcard%22%3Atrue%2C%22query%22%3A%22fileid%3AIOOS-MARACOOS.*%22%7D%7D%5D%7D%7D%7D#searchPanel HTTPS Web browser Granule Search Search for data granules belonging to this collection (a granule is the smallest aggregation of data that can be independently described and retrieved). search https://www.ncei.noaa.gov/thredds-ocean/catalog/ioos/maracoos/catalog.html THREDDS Web browsers can browse THREDDS Data Servers and specialized THREDDS software can enable more sophisticated data access and visualizations. THREDDS These data are available through a variety of services via a THREDDS (Thematic Real-time Environmental Distributed Data Services) Data Server (TDS). Depending on the dataset, the TDS can provide WMS, WCS, DAP, HTTP, and other data access and metadata services as well. For more information on the TDS, see http://www.unidata.ucar.edu/software/thredds/current/tds/. download https://www.ncei.noaa.gov/data/oceans/ioos/maracoos/ HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/pub/data.nodc/ioos/maracoos/ 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 series NCEI Accession 0163364 v1.1 was published. 2017-06-14T15:25:10Z NCEI Accession 0163410 v1.1 was published. 2017-06-16T10:37:43Z NCEI Accession 0163411 v1.1 was published. 2017-06-16T10:38:04Z NCEI Accession 0163412 v1.1 was published. 2017-06-16T10:39:21Z NCEI Accession 0163413 v1.1 was published. 2017-06-16T10:40:04Z NCEI Accession 0163414 v1.1 was published. 2017-06-16T10:40:17Z NCEI Accession 0163415 v1.1 was published. 2017-06-16T10:40:27Z NCEI Accession 0163416 v1.1 was published. 2017-06-16T10:42:07Z NCEI Accession 0163417 v1.1 was published. 2017-06-16T10:42:18Z NCEI Accession 0163418 v1.1 was published. 2017-06-16T10:42:30Z NCEI Accession 0163419 v1.1 was published. 2017-06-16T10:42:54Z NCEI Accession 0163602 v1.1 was published. 2017-06-21T10:36:13Z NCEI Accession 0163603 v1.1 was published. 2017-06-21T10:36:25Z NCEI Accession 0163604 v1.1 was published. 2017-06-21T10:37:41Z NCEI Accession 0163605 v1.1 was published. 2017-06-21T10:37:44Z NCEI Accession 0163364 was revised and v2.2 was published. 2017-08-17T10:36:10Z NCEI Accession 0163412 was revised and v2.2 was published. 2017-08-17T10:37:20Z NCEI Accession 0163602 was revised and v2.2 was published. 2020-01-18T16:01:33Z NCEI Accession 0163410 was revised and v2.2 was published. 2020-02-17T11:05:04Z NCEI Accession 0163411 was revised and v2.2 was published. 2020-02-17T11:17:08Z NCEI Accession 0163603 was revised and v2.2 was published. 2020-02-17T11:25:19Z NCEI Accession 0163604 was revised and v2.2 was published. 2020-02-17T11:55:54Z NCEI Accession 0163413 was revised and v2.2 was published. 2020-02-17T12:19:23Z NCEI Accession 0163605 was revised and v2.2 was published. 2020-02-17T12:20:31Z NCEI Accession 0163414 was revised and v2.2 was published. 2020-02-17T12:31:31Z NCEI Accession 0163415 was revised and v2.2 was published. 2020-02-17T12:39:09Z NCEI Accession 0163416 was revised and v2.2 was published. 2020-02-17T13:22:40Z NCEI Accession 0163417 was revised and v2.2 was published. 2020-02-17T13:26:59Z NCEI Accession 0163418 was revised and v2.2 was published. 2020-02-17T13:37:26Z NCEI Accession 0163419 was revised and v2.2 was published. 2020-02-17T13:53:34Z NCEI Accession 0163364 was revised and v3.3 was published. 2021-02-17T18:21:39Z NCEI Accession 0163412 was revised and v3.3 was published. 2021-02-17T18:34:00Z asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian anemometer anemometer measures wind speed An anemometer is an instrument that measures wind speed. Note that an aerovane (insttypes_id 175) is an anemometer which has a tail and a propeller to measure the speed and direction of the wind. barometer barometer Barometers are instruments for measuring atmospheric pressure; two types include mercury barometers and aneroid barometers. C-T recorder C-T recorder An instrument that measures and records conductivity and temperature as is often attached to a mooring. fluorometer fluorometer fluorometer humidity sensor humidity sensor HUMIDITY SENSORS are devices that receive a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it, in this case humidity or some measure of the water vapor content of air. meteorological sensor meteorological sensor Any meteorological sensor, but also see specific instruments such as aerovane, anemometer, etc. multi-parameter water quality sensor multi-parameter water quality sensor used to measure temperature, salinity, dissolved oxygen, and other parameters Instrument used to measure temperature, salinity, dissolved oxygen, and other parameters, often used to measure water quality parameters. Can be a hand-held instrument or a sonde for unattended monitoring. Often used in coastal water monitoring stations. YSI is the preeminent brand (as of 2024). oxygen sensor oxygen sensor Any instrument that measures oxygen content in a compound. PAR Sensor PAR Sensor Photosynthetically Active Radiation Sensor The PAR sensor measures global solar radiation from 400 to 700 nm, which approximates the spectral band active in photosynthesis. The response of the instrument falls sharply to zero on either side of this band, and between 400 and 670 nm it increases monotonically from about 50% to 100%. There is no protective glass dome over the receiving surface. Irradiance from the sun passes through a small white visible bandpass filter/diffuser in the shape of a horizontal disk at the top of the instrument. Within the instrument radiation is directed through a series of colored glass filters and onto a silicon photodiode detector. The factory-supplied calibration converts the signal from the detector to a flux of photons in micro-mole (of photons) s-1 m-2. (One micro-mole equals 6.022 E17 photons.) For the solar spectrum, these units may be converted to watts per square meter by dividing by 4.6. (http://www.srrb.noaa.gov/instrument/par.htm) pH sensor pH sensor generic meter used to measure pH Any of a class of instruments used to quantify pH in a water or other type of sample. rain gauge rain gauge A device to measure the amount of liquid precipitation The definition of liquid precipitation is any form of water falling from the sky as rain. Rain gauge measures the amount of liquid precipitation. temperature probe temperature probe For example, OMEGA temperature probe PR-11-2-100-1/8-6-e Vaisala HUMICAP® Humidity and Temperature Probe HMP155 temperature sensor temperature sensor A sensor used to measure temperature. 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. water level recorder water level recorder A seabed mounted unit calculating water level by means of precise measurements of hydrostatic pressure. FIXED PLATFORM OF UNITED STATES FIXED PLATFORM OF UNITED STATES