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MAPCO2 Buoy: Olowalu, Maui, Hawaii

Published by NOAA Pacific Marine Environmental Laboratory (PMEL) | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: January 27, 2026 | Last Modified: 2023-07-05T00:00:00.000+00:00
This buoy is located approximately 500 meters offshore of the west coast of the island of Maui near Olowalu in the State of Hawaii. It is moored in waters 15 m (50 ft) deep. Data are recorded every 3 hours and transmitted daily. This Moored Autonomous Partial Pressure of Carbon Dioxide (MAPCO2) buoy was primarily established to monitor ocean acidification within a tropical coral reef ecosystem in the Central Pacific, complementing a national array of moored carbon dioxide buoys across the Pacific, Atlantic, and Caribbean. Other important physical parameters are also monitored to help provide early indications of run-off from land-based waterways such as streams and other outflows that lead directly into the ocean. The buoy is funded as part of a gift from Dr. Priscilla Chan and Mark Zuckerberg to the Hawaii Institute of Marine Biology (HIMB) to improve Hawaii's ocean health. The University of Hawaii at Manoa supports the maintenance of the buoy and instrumentation. Data are managed by NOAA's Pacific Marine Environmental Laboratory (PMEL) at the NOAA Western Regional Center in Seattle, Washington. PMEL enables data streaming into the PacIOOS website for visualization purposes only: the near real-time data have not been post-calibrated or quality controlled and are therefore not of the climate quality that PMEL is required to achieve. Only post-calibrated and quality-controlled data should be used for scientific publications and are available for download separately at the NOAA Ocean Carbon Data System (OCADS) website in a delayed-mode capacity.

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Earth Science > Atmosphere > Atmospheric Chemistry > Carbon And Hydrocarbon Compounds > Carbon Dioxide Earth Science > Atmosphere > Atmospheric Pressure > Surface Pressure Earth Science > Oceans > Ocean Chemistry > Carbon Dioxide 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 > Salinity Earth Science > Oceans > Water Quality In Situ Ocean-based Platforms > Buoys In Situ Ocean-based Platforms > Moorings In Situ/Laboratory Instruments > Chemical Meters/Analyzers > > > CO2 Analyzers In Situ/Laboratory Instruments > Chemical Meters/Analyzers > > > Fluorometers 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 > Photon/Optical Detectors > > > Turbidity Meters In Situ/Laboratory Instruments > Pressure/Height Meters > > > Pressure Sensors In Situ/Laboratory Instruments > Profilers/Sounders > > > CTD In Situ/Laboratory Instruments > Temperature/Humidity Sensors > > > Temperature Sensors Continent > North America > United States Of America > Hawaii Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Maui > Olowalu PacIOOS > Pacific Islands Ocean Observing System Government Agencies-U.S. Federal Agencies > DOC > NOAA > > DOC/NOAA/OAR/PMEL > Pacific Marine Environmental Laboratory, OAR, NOAA, U.S. Department of Commerce Government Agencies-U.S. Federal Agencies > DOC > NOAA > > DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce mass_concentration_of_chlorophyll_in_sea_water mass_concentration_of_oxygen_in_sea_water mole_fraction_of_carbon_dioxide_in_air mole_fraction_of_carbon_dioxide_in_sea_water sea_water_ph_reported_on_total_scale sea_water_temperature sea_water_turbidity sea_water_salinity surface_air_pressure depth latitude longitude time

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