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National Coral Reef Monitoring Program: Diel seawater carbonate chemistry observations from a suite of instrumentation deployed at coral reef sites across the Hawaiian Archipelago since 2016

Published by Pacific Islands Fisheries Science Center | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: December 19, 2025 | Last Modified: 2021-01-01T00:00:00.000+00:00
The ocean acidification diel suite is an autonomous instrument package that measures diel variability in coral reef seawater carbonate chemistry. Diel suite surveys are conducted by the NOAA Pacific Islands Fisheries Science Center (PIFSC), Ecosystem Sciences Division (ESD) within coral reef ecosystems across the Pacific Islands Region as part of the NOAA National Coral Reef Monitoring Program (NCRMP). The data provided in this record are from diel suites deployed across the Hawaiian Archipelago since 2016 during ESD-led NCRMP missions. Specifically, at select sites at Kure Atoll and Lisianski Island between September 14th - 26th, 2016 as well as Lanai and the Main Hawaiian Islands between July 10th - July 30th, 2019. Diel suites were deployed on the reef for at least 24 hours to measure in-situ salinity, temperature, pressure, pH, and current direction and magnitude. Seawater samples were also collected for laboratory analyses of dissolved inorganic carbon (DIC) and total alkalinity (TA). Components of the carbonate system--including pH, pCO2 (partial pressure of carbon dioxide), and aragonite saturation state--are calculated from DIC, TA, temperature, salinity and pressure. Each diel suite consisted of: 1 SBE-19plus CTD sensor, 1 Nortek Acoustic Doppler Current Profiler (ADCP), 1 Satlantic SeaFET Ocean pH sensor, and up to 9 Programmable Underwater Collectors (PUCs), each of which collected 1 water sample at 4-hour intervals; however, only data from the CTD and water samples were recovered from the diel surveys at Kure and Lisianski in 2016. Starting 2018, 1 SBE-43 oxygen sensor was tethered to the CTD sensor for diel surveys. Stand-alone dissolved oxygen (DO) and photosynthetically active radiation (PAR) loggers were included with the diel suite deployments starting HARAMP 2019. Instruments deployed, samples collected, and sample intervals are recorded in the summary file enclosed with the data package, and exceptions to the standard diel suite are also noted.

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743 National Coral Reef Monitoring Program Numeric Data Sets > Oceanography EARTH SCIENCE > Biosphere > Aquatic Habitat > Reef Habitat EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > In Situ Chemical EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > In Situ Physical EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs EARTH SCIENCE > Oceans > Ocean Chemistry > Alkalinity EARTH SCIENCE > Oceans > Ocean Chemistry > Calcification EARTH SCIENCE > Oceans > Ocean Chemistry > Carbon Dioxide > Partial Pressure EARTH SCIENCE > Oceans > Ocean Chemistry > Carbonate Chemistry EARTH SCIENCE > Oceans > Ocean Chemistry > Chemistry Monitoring and Assessment EARTH SCIENCE > Oceans > Ocean Chemistry > Climate Change EARTH SCIENCE > Oceans > Ocean Chemistry > Dissolution EARTH SCIENCE > Oceans > Ocean Chemistry > Dissolved Gases EARTH SCIENCE > Oceans > Ocean Chemistry > Dissolved Inorganic Carbon EARTH SCIENCE > Oceans > Ocean Chemistry > Ocean Acidification EARTH SCIENCE > Oceans > Ocean Chemistry > Oxygen EARTH SCIENCE > Oceans > Ocean Chemistry > Saturation State EARTH SCIENCE > Oceans > Ocean Chemistry > pH EARTH SCIENCE > Oceans > Ocean Optics > Photosynthetically Active Radiation EARTH SCIENCE > Oceans > Ocean Temperature > Water Temperature EARTH SCIENCE > Oceans > Salinity/Density > Conductivity EARTH SCIENCE > Oceans > Salinity/Density > Density EARTH SCIENCE > Oceans > Salinity/Density > Salinity ALKALINITY - TOTAL [total alkalinity] ARAGONITE SATURATION STATE CONDUCTIVITY DEPTH - SENSOR DISSOLVED INORGANIC CARBON (DIC) PRESSURE - WATER [HYDROSTATIC PRESSURE] Photosynthetic Photon Flux Density (PPFD) SALINITY - BOTTOM WATER SIGMA-T WATER TEMPERATURE dissolved oxygen pH partial pressure of carbon dioxide - water ADCP CTD - moored CTD Coulometer for DIC measurement PAR sensor dive computer oxygen sensor pH sensor temperature sensor titrator continuous in situ physical time series profile water chemistry HI'IALAKAI CORAL REEF STUDIES Coral Reef Conservation Program National Coral Reef Monitoring Program US DOC; NOAA; NMFS; Pacific Islands Fisheries Science Center; Ecosystem Sciences Division COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Kure Atoll (28N178W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Lisianski Island (25N173W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Maui > Lanai Island (20N156W0002) COUNTRY/TERRITORY > United States of America > Hawaiian Islands (21N157W0027) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands (21N157W0027) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Lanai Island > Lanai Island (20N156W0002 OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Kure Atoll (28N178W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Lisianski Island (25N173W0001) Central Pacific Ocean Coastal Waters of Hawaii North Pacific Ocean Papahānaumokuākea Marine National Monument CRED CREP CTD Coral Reef Ecosystem Division Coral Reef Ecosystem Program ESD Ecosystem Sciences Division NCRMP National Coral Reef Monitoring Program PIFSC PUC Pacific Islands Fisheries Science Center RAMP REA Rapid Ecological Assessment Reef Assessment and Monitoring Program diel programmable underwater collector water samples NWHI Northwestern Hawaiian Islands DOC/NOAA/NMFS/PIFSC > Pacific Islands Fisheries Science Center, National Marine Fisheries Service, NOAA, U.S. Department of Commerce Hawaiian Archipelago

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