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MAPCO2 Buoy: Poipu, Kauai, Hawaii

Published by NOAA Pacific Marine Environmental Laboratory (PMEL) | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: April 21, 2026 at 09:42 AM | Dataset Last Updated: September 01, 2023 at 12:00 AM
This buoy is located approximately 850 meters offshore of the south coast of the island of Kauai near Poipu in the State of Hawaii. It is moored in waters 17 m (55 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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