gov.noaa.nodc:0229832 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 2026-07-28T13:32:04Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Surface measurements of partial pressure of CO2 (pCO2), pH on total scale, water temperature, salinity, and other variables in the Casco Bay, Gulf of Maine from 2015-04-23 to 2020-06-12 (NCEI Accession 0229832) 2021-04-27 publication 2021-04-20 creation International DOI Foundation (IDF) 10.25921/m3bx-v840 NOAA National Centers for Environmental Information gov.noaa.nodc:0229832 NCEI Archive Management System 0229832 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 Christopher W. Hunt University of New Hampshire (UNH) chunt@unh.edu resourceProvider University of New Hampshire (UNH) resourceProvider Christopher Hunt University of New Hampshire (UNH) chunt@unh.edu principalInvestigator Curtis Bohlen Casco Bay Estuary Partnership curtis.bohlen@maine.edu principalInvestigator Matthew Liebman US Environmental Protection Agency (US EPA) Liebman.Matt@epa.gov principalInvestigator Hunt, Christopher W. University of New Hampshire author Bohlen, Curtis Casco Bay Estuary Partnership author Liebman, Matthew US Environmental Protection Agency author University of New Hampshire (UNH) contributor tableDigital This dataset consists of surface measurements of partial pressure of CO2 (pCO2), pH on total scale, water temperature, salinity, and other variables in the Casco Bay, Gulf of Maine from 2015-04-23 to 2020-06-12. The central goal of this project was to install continuous monitoring sensors in Casco Bay to measure ocean and coastal acidification parameters at high temporal resolution. The system was installed at the Southern Maine Community College (SMCC) pier in South Portland, Maine. The pier is located in the Portland Channel, an important southern outlet of Casco Bay, and near outlets of the Fore and Presumpscot rivers in a relatively urban area of Casco Bay. This location was selected because it is nearshore, accessible, and has historic nutrient data collected by the Friends of Casco Bay. Sensors for temperature/conductivity/salinity, dissolved oxygen, pH and pCO2 were mounted to a ‘lander’ frame, which was lowered via davit to the bottom. Sensor data were thus collected approximately 1m from the bottom, and at varying depth depending on the tide. Ocean Acidification monitoring Funding Information: 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 https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0229832 Preview graphic PNG 0229832 NCEI ACCESSION NUMBER 2021-04-19 publication CONDUCTIVITY DISSOLVED OXYGEN partial pressure of carbon dioxide - water SALINITY WATER TEMPERATURE theme NODC DATA TYPES THESAURUS carbon dioxide (CO2) gas analyzer salinometer temperature sensor instrument NODC INSTRUMENT TYPES THESAURUS chemical in situ physical theme NODC OBSERVATION TYPES THESAURUS University of New Hampshire dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS University of New Hampshire dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS US DOC; NOAA; Office of Oceanic and Atmospheric Research; Ocean Acidification Program (OAP) project NODC PROJECT NAMES THESAURUS Gulf of Maine place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication Coastal project Cruise ID 90UY20150423 project EXPOCODE Ocean Carbon and Acidification Data System (OCADS) Project project Ocean Acidification Search Keywords EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY 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 Surface measurement Surface underway theme OCADS Study Type Optode_O2 SAMI_CO2 SBE37_CON SBE37_SALINITY SBE_37_TEMP pHINT, pHEXT theme Provider Variable Abbreviations CO2 ANALYZERS > CO2 ANALYZERS SALINOMETERS TEMPERATURE SENSORS > TEMPERATURE SENSORS 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 Aanderaa Oxygen Optode SAMI-CO2 SBE-37 Sea-bird SeaFET instrument Provider Instruments OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF MAINE 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 Casco Bay Gulf of Maine place Provider Geographic Names Casco Bay, Gulf of Maine place Provider Place Names MJTGXE Send2NCEI Submission Package ID accessLevel: public otherRestrictions Cite as: Hunt, Christopher W.; Bohlen, Curtis; Liebman, Matthew (2021). Surface measurements of partial pressure of CO2 (pCO2), pH on total scale, water temperature, salinity, and other variables in the Casco Bay, Gulf of Maine from 2015-04-23 to 2020-06-12 (NCEI Accession 0229832). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/m3bx-v840. 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. Global Coastal Program Data: North America East Coast 2022 publication https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/Coastal/north_america_east.html HTTPS https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/Coastal/north_america_east.html Related resource information NOAA National Centers for Environmental Information (NCEI) publisher documentDigital crossReference project NOAA National Centers for Environmental Information (2022). Ocean Carbon and Acidification Data System (OCADS). NOAA National Centers for Environmental Information. https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system 2022-04 publication https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system HTTPS https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system OCADS website information NOAA National Centers for Environmental Information author NOAA National Centers for Environmental Information (NCEI) publisher documentDigital [accessed 2024-02-08] crossReference program eng; USA utf8 environment oceans -70.2285 -70.2283 43.6512 43.6512 2015-04-23 2020-06-12 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. Originator data format 23.608 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0229832.html HTTPS Web browser Project Metadata Navigate directly to the URL for a descriptive web page with download links. information https://doi.org/10.25921/m3bx-v840 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/229832 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/229832 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0176/0229832/ 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 0229832 v1.1 was published. 2021-04-27T22:16:30Z NCEI Accession 0229832 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0229832/1.1 HTTPS NCEI Accession 0229832 v1.1 published 2021-04-27T22:16:30Z download dataset Parameter or Variable: pH; Abbreviation: pHINT, pHEXT; pH scale: Total; Observation type: Hourly Sensor Readings; Measured or calculated: Measured; Sampling instrument: Sea-bird SeaFET; Temperature of pH measurement: in-situ; Detailed sampling and analyzing information: The SeaFET instrument provides two pH readings: internal (INT) via an electrode, and external (EXT) via a Field Effect Transducer (FET). We report both readings.; Standardization frequency: Annual manufacturer calibration; At what temperature was pH reported: in situ; Uncertainty: Manufacturer: ±0.05 accuracy, ±0.0001 precision Parameter or Variable: pCO2 (fCO2) autonomous; Abbreviation: SAMI_CO2; Unit: microatmospheres; Observation type: Hourly sensor readings; Measured or calculated: measured; Sampling instrument: SAMI-CO2; Analyzing instrument: SAMI-CO2; Detailed sampling and analyzing information: The SAMI instrument measured the in situ pCO2 via a colorimetric reagent method; Uncertainty: Manufacturer: ±3 µatm accuracy, <1 µatm precision Parameter or Variable: Water Temperature; Abbreviation: SBE_37_TEMP; Unit: Degrees Celcius; Sampling instrument: Sea-Bird SBE-37; Uncertainty: Manufacturer: Accuracy 0.002, Resolution 0.0001 Parameter or Variable: Conductivity; Abbreviation: SBE37_CON; Unit: siemens per meter; Sampling instrument: Sea-Bird SBE-37; Uncertainty: Manufacturer: Accuracy ±0.0003, Resolution 0.00001 Parameter or Variable: Salinity; Abbreviation: SBE37_SALINITY; Unit: unitless; Analyzing instrument: Sea-Bird SBE-37; Uncertainty: see Conductivity uncertainties Parameter or Variable: Dissolved Oxygen; Abbreviation: Optode_O2; Unit: micromoles per kilogram; Analyzing instrument: Aanderaa Oxygen Optode 3835; Uncertainty: Manufacturer: Accuracy <8, Resolution <1 asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian carbon dioxide (CO2) gas analyzer carbon dioxide (CO2) gas analyzer measures gaseous carbon dioxide Carbon dioxide gas analyzer has often been referred to as LI-COR, because a lot of researchers choose to use products manufactured by LI-COR incorporation for their carbon dioxide measurement. The main component of a carbon dioxide analyzer is a nondispersive infrared (NDIR) spectroscopic sensors to detect CO2 in a gaseous environment by its characteristic absorption. Carbon dioxide (CO2) gas analyzer works together with carbon dioxide (CO2) equilibrator (insttypes_id 184) to measure carbon dioxide in the water. To measure water carbon dioxide, water needs to be continuously supplied to a showerhead inside an equilibrator. As the water flows through the equilibrator chamber, dissolved carbon dioxide exchanges quickly with air in the headspace. This air is then sampled by the carbon dioxide analyzer to determine the mole fraction of CO2 in water. salinometer salinometer generic salinometer use salinometer when the instrument type used is unclear but the data include salinity measurements temperature sensor temperature sensor A sensor used to measure temperature.