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National Coral Reef Monitoring Program: Diel seawater carbonate chemistry observations from a suite of instrumentation deployed at coral reef sites at Tutuila Island, American Samoa in 2015 and 2018

Published by Pacific Islands Fisheries Science Center | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: August 02, 2026 at 11:23 PM | Dataset Last Updated: January 01, 2021 at 12:00 AM
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 data set are from diel suites deployed at select sites at Tutuila Island in March 2015 and June - July 2018, during the ESD-led NCRMP missions to American Samoa. Diel suites were deployed on the reef for at least 24 hours to measure in-situ salinity, temperature, pressure, pH, current direction and magnitude, and dissolved oxygen (starting 2018). 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 typically 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 3- or 4-hour intervals. Starting 2018, 1 SBE-43 oxygen sensor is tethered to the CTD sensor for diel surveys. Diel surveys from 2019 also incorporate stand-alone PAR and DO loggers however they have yet to be conducted in American Samoa. 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

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@type dcat:Dataset
accessLevel non-public
contactPoint 
{
  "fn": "Barkley, Hannah C",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:hannah.barkley@noaa.gov"
}
describedByType application/octet-steam
description 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 data set are from diel suites deployed at select sites at Tutuila Island in March 2015 and June - July 2018, during the ESD-led NCRMP missions to American Samoa. Diel suites were deployed on the reef for at least 24 hours to measure in-situ salinity, temperature, pressure, pH, current direction and magnitude, and dissolved oxygen (starting 2018). 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 typically 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 3- or 4-hour intervals. Starting 2018, 1 SBE-43 oxygen sensor is tethered to the CTD sensor for diel surveys. Diel surveys from 2019 also incorporate stand-alone PAR and DO loggers however they have yet to be conducted in American Samoa. 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.
distribution 
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    "@type": "dcat:Distribution",
    "title": "ESD_NCRMP_DS_2015_AMSM_SUMMARY",
    "accessURL": "https://accession.nodc.noaa.gov/0186951",
    "mediaType": "text/html",
    "description": "Summary of the diel suite deployment in 2015  at REA Site TUT-75 and TUT-73, with information on the cruise and specific sites, as well as instruments and sampling intervals; different instruments could be deployed at different sites or instruments could have malfunctioned.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "ESD_NCRMP_DS_2018_AMSM",
    "accessURL": "https://accession.nodc.noaa.gov/0240606",
    "mediaType": "text/html",
    "description": "Directory folder that contains all instrument datasets as well as the summary file for the diel suite deployment in American Samoa during ASRAMP in 2018.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "GCMD Keyword Forum Page",
    "accessURL": "https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords",
    "mediaType": "text/html",
    "description": "Global Change Master Directory (GCMD). 2026. GCMD Keywords, Version 24. 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",
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    "title": "Full Metadata Record",
    "accessURL": "https://www.fisheries.noaa.gov/inport/item/54928",
    "mediaType": "text/html",
    "description": "View the complete metadata record on InPort for more information about this dataset.",
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identifier https://data.noaa.gov/waf/NOAA/nmfs/pifsc/iso/xml/54928.xml
issued 2019-01-01T00:00:00.000+00:00
keyword 
[
  "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 > Saturation State",
  "EARTH SCIENCE > Oceans > Ocean Chemistry > pH",
  "EARTH SCIENCE > Oceans > Ocean Circulation",
  "EARTH SCIENCE > Oceans > Ocean Circulation > Water Current Direction",
  "EARTH SCIENCE > Oceans > Ocean Circulation > Water Velocity",
  "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",
  "CURRENT DIRECTION",
  "CURRENT SPEED",
  "DEPTH - SENSOR",
  "DISSOLVED INORGANIC CARBON (DIC)",
  "PRESSURE - WATER [HYDROSTATIC PRESSURE]",
  "SALINITY - BOTTOM WATER",
  "SCIENCE > Oceans > Ocean Chemistry > Oxygen",
  "SIGMA-T",
  "WATER TEMPERATURE",
  "dissolved oxygen",
  "pH",
  "partial pressure of carbon dioxide - water",
  "ADCP",
  "CTD - moored CTD",
  "Coulometer for DIC measurement",
  "oxygen sensor",
  "pH sensor",
  "temperature sensor",
  "titrator",
  "continuous",
  "current measurements",
  "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 > American Samoa > American Samoa > American Samoa (14S170W0000)",
  "COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Tutuila Island (14S170W0016)",
  "OCEAN BASIN > Pacific Ocean > American Samoa > American Samoa (14S170W0000)",
  "OCEAN BASIN > Pacific Ocean > American Samoa > Tutuila Island (14S170W0016)",
  "South Pacific Ocean",
  "ADCP",
  "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",
  "DOC/NOAA/NMFS/PIFSC > Pacific Islands Fisheries Science Center, National Marine Fisheries Service, NOAA, U.S. Department of Commerce",
  "American Samoa"
]
landingPage https://www.fisheries.noaa.gov/inport/item/54928
language 
[]
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2021-01-01T00:00:00.000+00:00
publisher 
{
  "name": "Pacific Islands Fisheries Science Center",
  "@type": "org:Organization"
}
rights otherRestrictions, unclassified
spatial -170.564,-14.3635,-170.7631,-14.2854
temporal 2015-03-27T00:00:00+00:00/2015-03-29T00:00:00+00:00
theme 
[
  "geospatial"
]
title National Coral Reef Monitoring Program: Diel seawater carbonate chemistry observations from a suite of instrumentation deployed at coral reef sites at Tutuila Island, American Samoa in 2015 and 2018

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