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National Coral Reef Monitoring Program: Water chemistry of the coral reefs in the Pacific Ocean

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: January 27, 2026 | Last Modified: 2025-12-16T00:00:00.000+00:00
This collection contains water sample data that are collected and analyzed to assess spatial and temporal variation in the seawater carbonate systems of coral reef ecosystems in the Hawaiian and Mariana Archipelagos, American Samoa, and the Pacific Remote Island Areas as part of NOAA's ongoing National Coral Reef Monitoring Program (NCRMP) and with support from NOAA's Ocean Acidification Program (OAP). The data described here are from water samples collected at existing, long-term monitoring sites during NOAA Pacific Islands Fisheries Science Center (PIFSC), Ecosystem Sciences Division (ESD) led NCRMP missions. Two water samples are typically collected from each site—one at the reef and one at the surface directly above the reef—and a third sample may also be collected approximately 1 km offshore from the site. The samples are processed by CREP and sent to NOAA Pacific Marine Environmental Laboratory (PMEL) to be analyzed for total alkalinity (TA) and dissolved inorganic carbon (DIC). From these constituents, alongside temperature, salinity, and depth data, other constituents of the seawater carbonate system can be calculated. These monitoring data provide a baseline for tracking reef carbonate system changes due to globally increasing levels of atmospheric carbon dioxide.

Resources

6 resources available

  • CRCP Pacific Carb Chem

    FILE
  • NCEI Dataset Landing Page

    PLACEHOLDER/VALUE
  • Granule Search

    PLACEHOLDER/VALUE
  • https://www.ncei.noaa.gov/archive/accession/0157633

    PLACEHOLDER/VALUE
  • GCMD Keyword Forum Page

    PLACEHOLDER/VALUE
  • NCEI Contact Information

    PLACEHOLDER/VALUE

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0131502 0157714 0157715 0157716 0159169 0159171 0160330 0175227 0175228 0175229 0175230 0225980 0226794 0226976 0283239 0302039 0302040 0306674 0310598 0310600 ARAGONITE SATURATION STATE CONDUCTIVITY DEPTH - OBSERVATION DISSOLVED INORGANIC CARBON (DIC) HYDROSTATIC PRESSURE partial pressure of carbon dioxide - water pH SALINITY total alkalinity WATER DENSITY WATER TEMPERATURE bottle carbon dioxide (CO2) gas analyzer coulometer for DIC measurement CTD Niskin bottle pH sensor salinometer temperature sensor thermometer thermosalinograph titrator chemical discrete sample physical profile surface measurements surface underway survey - coral reef water chemistry NOAA Ship Hi'ialakai NOAA Ship Oscar Elton Sette NOAA Ship Rainier Coral Reef Ecosystem Program NOAA Pacific Islands Fisheries Science Center NOAA Pacific Islands Fisheries Science Center, Ecosystem Sciences Division University of Hawai'i at Mānoa Coral Reef Ecosystem Program NOAA Pacific Islands Fisheries Science Center NOAA Pacific Islands Fisheries Science Center, Ecosystem Sciences Division American Samoa Reef and Assessment Monitoring Program (ASRAMP) Coral Reef Conservation Program (CRCP) Coral Reef Information System (CoRIS) CORAL REEF STUDIES National Coral Reef Monitoring Program (NCRMP) NODC Ocean Acidification Scientific Data Stewardship (OADS) Ocean Carbon and Acidification Data System (OCADS) Pacific Reef and Assessment Monitoring Program (Pacific RAMP) US DOC; NOAA; Office of Oceanic and Atmospheric Research; Ocean Acidification Program (OAP) Equatorial Pacific Ocean Hawaiian Islands Humpback Whale National Marine Sanctuary National Marine Sanctuary of American Samoa North Pacific Ocean Papahānaumokuākea Marine National Monument Philippine Sea Rose Atoll Marine National Monument South Pacific Ocean oceanography CRED CREP Coral Reef Ecosystem Division Coral Reef Ecosystem Program PIFSC Pacific Islands Fisheries Science Center DOC/NOAA/NMFS > National Marine Fisheries Service, NOAA, U.S. Department of Commerce DOC/NOAA/NMFS/PIFSC/ESD > Ecosystem Sciences Division, Pacific Islands Fisheries Science Center, National Marine Fisheries Service, NOAA, U.S. Department of Commerce CRED CREP Coral Reef Ecosystem Division Coral Reef Ecosystem Program PIFSC Pacific Islands Fisheries Science Center 587 743 National Coral Reef Monitoring Program National Coral Reef Monitoring Program (NCRMP) Pacific Reef Assessment and Monitoring Program: Monitoring coral reef ecosystems of the US Pacific Islands and Atolls HA1304 HA1305 HA1401 HA1401_LegI HA1501_LINE HA1501_PHOENIX HA1501_SAMOA HA1505 HA1606_MHI HA1606_NWHI HA1701_MARIANAS HA1701_PRIA HA1801_AMSAMOA HA1801_Line HA1801_Phoenix MP2108 RA1903_NWHI_Leg4 RA2301 SB1320 SE1305 SE1602 SE1902_MHI_Leg1 SE1902_MHI_Leg2 SE1902_MHI_Leg3 SE2406 SE2503 315R20190821 315R20230309 315R20230425 315R20230621 315R20230718 330C20190419 330C20190709 330C20190722 33HL20130801 33HL20130903 33HL20140305 33HL20140320 33HL20150120 33HL20150213 33HL20150331 33HL20150714 33HL20160712 33HL20160825 33HL20170326 33HL20170430 33HL20180531 33HL20180618 33HL20180726 33HL20210519 33OC20130710 33OC20160511 33OC20240701 33OC20240806 33OC20250319 33OC20250508 33OC20250611 RAMP Reef Assessment and Monitoring Program Ocean Acidification Data Stewardship (OADS) Project Ocean Acidification Program (OAP) Ocean Carbon and Acidification Data System (OCADS) Project National Coral Reef Monitoring Program (NCRMP) Ocean Acidification Program (OAP - US DOC; NOAA; Office of Oceanic and Atmospheric Research) NCRMP National Coral Reef Monitoring Program (NCRMP) Numeric Data Sets > Water Quality EARTH SCIENCE > Biosphere > Aquatic Habitat > Reef Habitat EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs EARTH SCIENCE > Oceans > Ocean Chemistry > Alkalinity EARTH SCIENCE > Oceans > Ocean Chemistry > Carbon Dioxide EARTH SCIENCE > Oceans > Ocean Chemistry > Carbonate Chemistry EARTH SCIENCE > Oceans > Ocean Chemistry > Chemistry Monitoring and Assessment EARTH SCIENCE > Oceans > Ocean Chemistry > Dissolved Gases EARTH SCIENCE > Oceans > Ocean Chemistry > Inorganic Carbon EARTH SCIENCE > Oceans > Ocean Chemistry > Ocean Acidification EARTH SCIENCE > Oceans > Ocean Chemistry > pH Monitoring EARTH SCIENCE > OCEANS > COASTAL PROCESSES > CORAL REEFS EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBONATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > DISSOLVED GASES EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE 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 Discrete measurement Surface measurement Surface underway laboratory analysis ARAGONITE_SAT ASSOC_OCC_SITEID CAST_NUMBER CTDCASTID_ESD DAY_UTC DEPTH_METER DIC DIC_UMOL_KG DIC_UMOL_KG_FLAG LATITUDE_DEC LOCATION LOCATIONCODE LONGITUDE_DEC MONTH_UTC PRESSURE_DB_CALCULATED PRESSURE_DB_CTD REGION REGIONCODE SALINITY_PSS78_BEST SALINITY_PSS78_BEST_ORIGIN SALINITY_PSS78_BOTTLE SALINITY_PSS78_BOTTLE_FLAG SALINITY_PSS78_CTD SALINITY_PSS78_CTD_FLAG SALINITY_PSS78_SCS SAMPLE_FREQUENCY SAMPLE_ID STATION_ID SURVEY_DESIGN TA TALK_UMOL_KG TALK_UMOL_KG_FLAG TEMPERATURE_ITS90_BEST TEMPERATURE_ITS90_BEST_ORIGIN TEMPERATURE_ITS90_CTD TEMPERATURE_ITS90_CTD_FLAG TEMPERATURE_ITS90_SCS TIMESTAMP_UTC TIME_UTC YEARDAY_UTC YEAR_UTC pCO2_UATM_CALCULATED pH pH_TS_CALCULATED CO2 ANALYZERS > CO2 ANALYZERS COULOMETERS CTD > Conductivity, Temperature, Depth NISKIN BOTTLES PH METERS > PH METERS SALINOMETERS TEMPERATURE SENSORS > TEMPERATURE SENSORS THERMOMETERS > THERMOMETERS THERMOSALINOGRAPHS Dive computer Ships Hi'ialakai (call sign: WTEY, ICES code: 33HL, 2004-) OSCAR ELTON SETTE (call sign: WTEE, ICES code: 33OC, 2003-) RAINIER (call sign: WTEF, ICES code: 315R, 1968-) COUNTRY/TERRITORY > Northern Mariana Islands > Aguihan > Aguihan Island (Aguijan) (14N145E0006) COUNTRY/TERRITORY > Northern Mariana Islands > Alamagan Island > Alamagan Island (17N145E0002) COUNTRY/TERRITORY > Northern Mariana Islands > Asuncion Island > Asuncion Island (19N145E0001) COUNTRY/TERRITORY > Northern Mariana Islands > Farallon de Pajaros > Farallon de Pajaros (20N144E0001) COUNTRY/TERRITORY > Northern Mariana Islands > Guguan > Guguan Island (17N145E0001) COUNTRY/TERRITORY > Northern Mariana Islands > Maug > Maug Island (20N145E0001) COUNTRY/TERRITORY > Northern Mariana Islands > Northern Mariana Islands > Northern Mariana Islands ( CNMI ) (18N146E0000) COUNTRY/TERRITORY > Northern Mariana Islands > Pagan > Pagan Island (18N145E0001) COUNTRY/TERRITORY > Northern Mariana Islands > Rota > Rota Island ( Luta ) (14N145E0007) COUNTRY/TERRITORY > Northern Mariana Islands > Saipan > Saipan Island (15N145E0002) COUNTRY/TERRITORY > Northern Mariana Islands > Sarigan Island > Sarigan Island (16N145E0003) COUNTRY/TERRITORY > Northern Mariana Islands > Tinian > Tinian Island (14N145E0005) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > American Samoa (14S170W0000) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Manu'a Islands (14S170W0038) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Ofu Island (14S169W0013) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Olosega Island (14S169W0014) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Rose Atoll (14S168W0001) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Swains Atoll (11S171W0001) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Ta'u Island (14S169W0012) COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Tutuila Island (14S170W0016) COUNTRY/TERRITORY > United States of America > Guam > Guam (13N144E0000) COUNTRY/TERRITORY > United States of America > Hawaii > Hawaii > Hawaii (21N160W0000) COUNTRY/TERRITORY > United States of America > Hawaii > Hawaii > Hawaii Island (19N155W0003) COUNTRY/TERRITORY > United States of America > Hawaii > Hawaii > Kauai Island (22N159W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Hawaii > Molokai Island (21N157W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > French Frigate Shoals (24N166W0001) 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 > Honolulu > Maro Reef (25N170W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Northwestern Hawaiian Islands (28N178W0000) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Oahu (21N157W0003) COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Pearl and Hermes Reef (27N176W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Kauai > Niihau Island (21N160W0001) COUNTRY/TERRITORY > United States of America > Hawaii > Maui > Lanai Island (20N156W0002) COUNTRY/TERRITORY > United States of America > Hawaii > Maui > Maui Island (20N156W0004) COUNTRY/TERRITORY > United States of America > Hawaiian Islands (21N157W0027) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Baker Island (00N176W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Howland Island (00S176W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Jarvis Island (00S160W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Johnston Atoll (16N169W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Kingman Reef (06N162W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Palmyra Atoll (05N162W0001) COUNTRY/TERRITORY > United States of America > USA Minor Outlying Islands > Wake Atoll (19N167E0001) OCEAN BASIN > Pacific Ocean > American Samoa > American Samoa (14S170W0000) OCEAN BASIN > Pacific Ocean > American Samoa > Manu'a Islands (14S170W0038) OCEAN BASIN > Pacific Ocean > American Samoa > Rose Atoll (14S168W0001) OCEAN BASIN > Pacific Ocean > American Samoa > Swains Atoll (11S171W0001) OCEAN BASIN > Pacific Ocean > American Samoa > Tutuila Island (14S170W0016) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Baker Island > Baker Island (00N176W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands (21N157W0027) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Hawaii > Hawaii (21N160W0000) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Hawaii Island > Hawaii Island (19N155W0003) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Kauai Island > Kauai Island (22N159W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Lanai Island > Lanai Island (20N156W0002) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Maui Island > Maui Island (20N156W0004) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Molokai Island > Molokai Island (21N157W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Niihau Island > Niihau Island (21N160W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Oahu Island > Oahu (21N157W0003) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Howland Island > Howland Island (00S176W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Johnston Atoll > Johnston Atoll (16N169W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Line Islands > Jarvis Island (00S160W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Line Islands > Kingman Reef (06N162W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Line Islands > Palmyra Atoll (05N162W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands (28N178W0000) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > French Frigate Shoals (24N166W0001) 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) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Maro Reef (25N170W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Pearl and Hermes Reef (27N176W0001) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Wake Atoll > Wake Atoll (19N167E0001) OCEAN BASIN > Pacific Ocean > Manu'a Group > Ofu Island (14S169W0013) OCEAN BASIN > Pacific Ocean > Manu'a Group > Olosega Island (14S169W0014) OCEAN BASIN > Pacific Ocean > Manu'a Group > Ta'u Island (14S169W0012) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Aguihan Island Reefs > Aguihan Island (Aguijan) (14N145E0006) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Alamagan Island > Alamagan Island (17N145E0002) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Asuncion Island > Asuncion Island (19N145E0001) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Farallon de Pajaros > Farallon de Pajaros (20N144E0001) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Guam (13N144E0000) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guguan Island > Guguan Island (17N145E0001) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Mariana Archipelago > Northern Mariana Islands ( CNMI ) (18N146E0000) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Maug Island > Maug Island (20N145E0001) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Pagan Island > Pagan Island (18N145E0001) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Rota Island > Rota Island ( Luta ) (14N145E0007) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Saipan Island > Saipan Island (15N145E0002) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Sarigan Island > Sarigan Island (16N145E0003) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Tinian Island Reefs > Tinian Island (14N145E0005) OCEAN > PACIFIC OCEAN OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > AMERICAN SAMOA OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > HAWAIIAN ISLANDS OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN NWHI Northwestern Hawaiian Islands American Samoa Commonwealth of the Northern Mariana Islands Commonwealth of the Northern Marianas Islands Guam Hawaiian Archipelago Line Islands Main Hawaiian Islands Mariana Archipelago North Pacific Ocean Northwest Hawaiian Islands Northwestern Hawaiian Islands Oahu Pacific Ocean Pacific Remote Island Areas Phoenix Islands South Pacific Ocean Wake Atoll CNMI Commonwealth of the Northern Mariana Islands MHI Main Hawaiian Islands Mariana Archipelago Mariana Islands Marianas NWHI Northwestern Hawaiian Islands PRIA Pacific Remote Island Areas Triennial Triennial 00RREK 0CC05H 21JR7A 9G3PKY DNER5J ND2U0T R01YDF

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