Skip to main content
Dataset Overview | National Centers for Environmental Information (NCEI)

National Coral Reef Monitoring Program: Dissolved inorganic carbon, total alkalinity, pH and other variables collected from surface discrete measurements using Coulometer, alkalinity titrator and other instruments from the Florida Keys, Dry Tortugas, Flower Garden Banks and Southeast Florida, from 2024-01-02 to 2024-12-26 (NCEI Accession 0308300)

browse graphicPreview graphic
This dataset contains carbonate chemistry data collected at both random locations and existing long-term sites in the Florida Keys, Dry Tortugas, Flower Garden Banks and Southeast Florida as part of the NOAA National Coral Reef Monitoring Program (NCRMP). These data are collected and analyzed to assess spatial and temporal variation in the seawater carbonate systems of coral reef ecosystems and include two types of sampling methods. The first method is collected by hand or niskin at the surface, either from the boat or by SCUBA divers. The second method uses subsurface autosamplers where water samples provided in this dataset were collected at a depth of approximately 15m. Samples are either collected singularly or as part of a diurnal set. The samples are processed by the Atlantic Oceanographic Meteorological Laboratory (AOML) where they are analyzed for total alkalinity (TA), dissolved inorganic carbon (DIC) and Spectrophotometric pH. Using the analyzed TA and DIC, alongside temperature, salinity and depth data, AOML staff calculated other important carbonate chemistry system parameters such as pH, pCO2, and aragonite saturation and reported the results in this dataset.
  • Cite as: Enochs, Ian C.; Besemer, Nicole; Boyd, Albert; Jankulak, Michael; Montes, Enrique (2025). National Coral Reef Monitoring Program: Dissolved inorganic carbon, total alkalinity, pH and other variables collected from surface discrete measurements using Coulometer, alkalinity titrator and other instruments from the Florida Keys, Dry Tortugas, Flower Garden Banks and Southeast Florida, from 2024-01-02 to 2024-12-26 (NCEI Accession 0308300). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0308300. Accessed [date].
gov.noaa.nodc:0308300
Full Text · XML
Download Data
  • HTTPS (download)
    Navigate directly to the URL for data access and direct download.
  • FTP (download)
    These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).
Distribution Formats
  • Originator data format
Ordering Instructions Contact NCEI for other distribution options and instructions.
Distributor NOAA National Centers for Environmental Information
+1-301-713-3277
ncei.info@noaa.gov
Dataset Point of Contact NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Time Period 2024-01-02 to 2024-12-26
Spatial Bounding Box Coordinates
West: -93.821567
East: -79.996114
South: 24.33917
North: 27.9218
Spatial Coverage Map
General Documentation
Associated Resources
  • NOAA National Centers for Environmental Information (2022). Ocean Carbon and Acidification Data System (OCADS). NOAA National Centers for Environmental Information. https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system
  • NOAA's National Coral Reef Monitoring Program
  • Barkley, Hannah C.; Alagata, Candace; Halperin, Ariel A.; Smith, Joy N.; Weible, Rebecca; Peterman, Jessica; Kealoha, Andrea (2025). National Coral Reef Monitoring Program: Dissolved inorganic carbon, total alkalinity, pH, and other variables collected from surface discrete measurements using coulometer, alkalinity titrator, and other instruments in the Hawaiian Archipelago from 2024-05-30 to 2024-08-28 (NCEI Accession 0306674). https://www.ncei.noaa.gov/archive/accession/0306674. In Ecosystem Sciences Division, Pacific Islands Fisheries Science Center. National Coral Reef Monitoring Program: Water chemistry of the coral reefs in the Pacific Ocean. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/nnk7-5f86.
  • Barkley, Hannah C.; Alagata, Candace; Halperin, Ariel A.; Smith, Joy N.; Weible, Rebecca (2025). National Coral Reef Monitoring Program: Dissolved inorganic carbon, total alkalinity, pH, and other variables collected from surface discrete measurements using Coulometer, alkalinity titrator, and other instruments from the Pacific Remote Island Areas, from 2023-03-16 to 2023-06-25 (NCEI Accession 0302039). https://www.ncei.noaa.gov/archive/accession/0302039. In Ecosystem Sciences Division, Pacific Islands Fisheries Science Center. National Coral Reef Monitoring Program: Water chemistry of the coral reefs in the Pacific Ocean. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/nnk7-5f86.
  • Enochs, Ian C.; Besemer, Nicole; Boyd, Albert; Jankulak, Michael; Kelble, Christopher R. (2024). National Coral Reef Monitoring Program: Dissolved inorganic carbon, total alkalinity, pH and other variables collected from surface discrete measurements using Coulometer, alkalinity titrator and other instruments from the Florida, Puerto Rico, U.S. Virgin Islands, and Flower Garden Banks from 2010-03-08 to 2022-12-18 (NCEI Accession 0290602). https://doi.org/10.25921/yc6w-ds56. In National Oceanic and Atmospheric Administration; NOAA Atlantic Oceanographic and Meteorological Laboratory; Cooperative Institute for Marine and Atmospheric Studies. National Coral Reef Monitoring Program: Carbonate chemistry data collected in the Atlantic Ocean. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/vfz0-dg77.
  • Barkley, Hannah C.; Alagata, Candace; Smith, Joy N.; Taylor, Zach; Peterman, Jessica; Kealoha, Andrea (2025). National Coral Reef Monitoring Program: Dissolved inorganic carbon, total alkalinity, pH, and other variables collected from surface discrete measurements using coulometer, alkalinity titrator, and other instruments in the Mariana Archipelago from 2025-05-09 to 2025-06-27 (NCEI Accession 0310598). https://www.ncei.noaa.gov/archive/accession/0310598. In Ecosystem Sciences Division, Pacific Islands Fisheries Science Center. National Coral Reef Monitoring Program: Water chemistry of the coral reefs in the Pacific Ocean. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/nnk7-5f86.
  • Barkley, Hannah C.; Alagata, Candace; Smith, Joy N.; Taylor, Zach; Peterman, Jessica; Kealoha, Andrea (2025). National Coral Reef Monitoring Program: Dissolved inorganic carbon, total alkalinity, pH, and other variables collected from surface discrete measurements using coulometer, alkalinity titrator, and other instruments in the Pacific Remote Island Areas from 2025-04-03 to 2025-04-08 (NCEI Accession 0310600). https://www.ncei.noaa.gov/archive/accession/0310600. In Ecosystem Sciences Division, Pacific Islands Fisheries Science Center. National Coral Reef Monitoring Program: Water chemistry of the coral reefs in the Pacific Ocean. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/nnk7-5f86.
  • Manzello, Derek P.; Enochs, Ian C.; Besemer, Nicole; Boyd, Albert (2021). Discrete carbonate chemistry and other data collected at random and long-term sites in the Gulf of Mexico, Florida Keys, St. Croix, USVI, and Flower Garden Banks for the National Coral Reef Monitoring Program from 2019-01-14 to 2019-12-24 (NCEI Accession 0224894). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/jnk3-tc67.
Publication Dates
  • publication: 2025-09-30
  • creation: 2025-09-26
Data Presentation Form Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status Complete - production of the data has been completed
Historical archive - data has been stored in an offline storage facility
Data Update Frequency As needed
Supplemental Information
This data package (Submission ID: BJJMVLYTA) was acquired by NCEI from the Scientific Data Integration System (SDIS) at the NOAA Pacific Marine Environmental Laboratory (PMEL) in accordance with the archival submission agreement between NCEI and PMEL.
Purpose Provide high-quality carbonate chemistry data (dissolved inorganic carbonand total alkalinity) for US coral reef areas at a several spatial and temporal scales, in close partnership with the larger CRCP NCRMP and OAP/PMEL NOA-ON efforts.
Use Limitations
  • accessLevel: Public
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Dataset Citation
  • Cite as: Enochs, Ian C.; Besemer, Nicole; Boyd, Albert; Jankulak, Michael; Montes, Enrique (2025). National Coral Reef Monitoring Program: Dissolved inorganic carbon, total alkalinity, pH and other variables collected from surface discrete measurements using Coulometer, alkalinity titrator and other instruments from the Florida Keys, Dry Tortugas, Flower Garden Banks and Southeast Florida, from 2024-01-02 to 2024-12-26 (NCEI Accession 0308300). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0308300. Accessed [date].
Cited Authors
Principal Investigators
Contributors
Resource Providers
Publishers
Acknowledgments
  • Funding Information: NOAA's Ocean Acidification Program (National Coral Reef Monitoring Program - Ocean Acidification Enterprise, 20680)
  • Funding Information: NOAA's Coral Reef Conservation Program (National Coral Reef Monitoring Program, 743)
Theme keywords NODC DATA TYPES THESAURUS NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
Global Change Master Directory (GCMD) Science Keywords OCADS Study Type
  • Discrete measurement
  • Surface discrete
Provider Variable Abbreviations
  • Aragonite_Sat_W
  • DIC_umol/kg
  • Salinity_Bottle
  • Sample_Depth_m
  • TA_umol/kg
  • Temperature_C
  • pCO2_uatm
  • pH_calculated
  • pH_measured
Data Center keywords NODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS Global Change Master Directory (GCMD) Data Center Keywords
Platform keywords NODC PLATFORM NAMES THESAURUS ICES/SeaDataNet Ship Codes
Instrument keywords NODC INSTRUMENT TYPES THESAURUS Global Change Master Directory (GCMD) Instrument Keywords
Place keywords NODC SEA AREA NAMES THESAURUS Global Change Master Directory (GCMD) Location Keywords Provider Geographic Names
  • Dry Tortugas
  • Florida Keys
  • Flower Garden Banks
  • Southeast Florida
Project keywords NODC PROJECT NAMES THESAURUS Cruise ID
  • Cpastal
Ocean Acidification Search Keywords
  • Ocean Acidification Program (OAP)
  • Ocean Carbon and Acidification Data System (OCADS) Project
Research Projects
  • National Coral Reef Monitoring Program (NCRMP)
Keywords NCEI ACCESSION NUMBER
Use Constraints
  • Cite as: Enochs, Ian C.; Besemer, Nicole; Boyd, Albert; Jankulak, Michael; Montes, Enrique (2025). National Coral Reef Monitoring Program: Dissolved inorganic carbon, total alkalinity, pH and other variables collected from surface discrete measurements using Coulometer, alkalinity titrator and other instruments from the Florida Keys, Dry Tortugas, Flower Garden Banks and Southeast Florida, from 2024-01-02 to 2024-12-26 (NCEI Accession 0308300). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0308300. Accessed [date].
Data License
Access Constraints
  • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Fees
  • In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
Lineage information for: dataset
Processing Steps
  • 2025-09-30T20:44:35Z - NCEI Accession 0308300 v1.1 was published.
Output Datasets
Lineage information for: dataset
Processing Steps
  • Parameter or Variable: Dissolved Inorganic Carbon; Abbreviation: DIC_umol/kg; Unit: umol/kg; Observation type: discrete water sample; In-situ / Manipulation / Response variable: IN-SITUOBSERVATION; Measured or calculated: MEASURED; Sampling instrument: Niskin bottle, stored in borosilicate bottle (125mL, 600mL); Analyzing instrument: Apollo Sci-tech DIC Analyzer, model no. AS-C3; Detailed sampling and analyzing information: Measurements drawn according to procedures in the Guide to best practices for ocean CO2 measurements (Dickson et al., 2007). Borosilicate bottle were rinsed and filled from bottom, leaving a minimal amount of headspace while making sure no bubbles were introduced. Then 200uL of saturated HgCl2 solution was added, bottles were sealed with glass stoppers lightly covered with Apiezon-L grease, and were stored at room temperature to be sent back to the lab for analysis on the Apollo Sci-tech DIC Analyzer.; Replicate information: duplicate samples analyzed; Standardization description: Duplicate samples are run in addition to Certified Reference Material (CRM), supplied by Dr. A. Dickson of UCSD; Standardization frequency: Along with duplicate samples being run throughout, CRMs are run at the beginning to generate offset value and at the end to assess drift; CRM manufacturer: Andrew Dickson's lab at Scripps Institute of Oceanography; CRM batch number: CRM 140, 150, 157, 164; Preservation method: saturated Mercury (II) Chloride (HgCl2); Preservative volume: 200uL; Uncertainty: ±2 umol/kg; Method reference: Dickson, A.G., Sabine, C.L. and Christian, J.R. (Eds.) 2007. Guide to best practices for ocean CO2 measurements. PICES Special Publication 3, 191 pp.; Researcher name: Ian Enochs; Researcher institution: Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration
  • Parameter or Variable: Total alkalinity; Abbreviation: TA_umol/kg; Unit: umol/kg; Observation type: discrete water sample; In-situ / Manipulation / Response variable: IN-SITUOBSERVATION; Measured or calculated: MEASURED; Sampling instrument: Niskin bottle, stored in borosilicate bottle (125mL, 600mL); Analyzing instrument: Apollo Sci-tech Alkalinity Titrator, model no. AS-ALK2; Type of titration: Gran titration; Cell type (open or closed): OPEN; Detailed sampling and analyzing information: Samples run using remaining water from the same sample bottles used for DIC. Refer to DIC for more information on sampling and conservation of samples. Water samples were titrated with 0.11M HCl solution.; Replicate information: 500-ml sets of duplicate samples; Standardization description: Duplicate samples are run in addition to Certified Reference Material (CRM), supplied by Dr. A. Dickson of UCSD; Standardization frequency: Along with duplicate samples being run throughout, CRMs are run at the beginning to generate offset value; CRM manufacturer: Andrew Dickson's lab at Scripps Institute of Oceanography; CRM batch number: CRM 140, 150, 157, 164; Preservation method: saturated Mercury (II) Chloride (HgCl2); Preservative volume: 200uL; Uncertainty: ± 1-2 umol/kg; Method reference: Dickson, A.G., Sabine, C.L. and Christian, J.R. (Eds.) 2007. Guide to best practices for ocean CO2 measurements. PICES Special Publication 3, 191 pp.; Researcher name: Ian Enochs; Researcher institution: Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration
  • Parameter or Variable: pH; Abbreviation: pH_calculated; pH scale: TOTALSCALE(T); Observation type: discrete water sample; In-situ / Manipulation / Response variable: IN-SITUOBSERVATION; Measured or calculated: CALCULATED; Calculation method and parameters: Seacarb R package version 3.2.12; Sampling instrument: Niskin bottle, stored in borosilicate bottle (125mL, 600mL); Detailed sampling and analyzing information: Same sample bottle for pH, DIC and TA analyses. Refer to DIC for more information on sampling and conservation of samples.; Replicate information: 500-ml sets of duplicate samples; At what temperature was pH reported: temperature during analysis (25C); Method reference: Gattuso, J.-P., Epitalon, J.-M., Lavigne, H., & Orr, J. (2019). Seacarb: Seawater carbonate chemistry. R package version 3.2. 12 (version 3.3.1). Retrieved from https://hal.u-pec.fr/UMS-829/hal-02345814v1
  • Parameter or Variable: pCO2 (fCO2) discrete; Abbreviation: pCO2_uatm; Unit: uatm; Observation type: discrete water sample; In-situ / Manipulation / Response variable: IN-SITUOBSERVATION; Measured or calculated: CALCULATED; Sampling instrument: Niskin bottle, stored in borosilicate bottle (125mL, 600mL); Storage method: Borosilicate bottle; Seawater volume: 500; Headspace volume: 5 mL; Detailed sampling and analyzing information: Same sample bottle for pCO2, pH, DIC, and TA analyses. Refer to DIC for more information on sampling and conservation of samples.; Sample replicate information: 500-ml sets of duplicate samples; Method reference: Gattuso, J.-P., Epitalon, J.-M., Lavigne, H., & Orr, J. (2019). Seacarb: Seawater carbonate chemistry. R package version 3.2. 12 (version 3.3.1). Retrieved from https://hal.u-pec.fr/UMS-829/hal-02345814v1
  • Parameter or Variable: Temperature measured during sample collection in degrees Celsius; Abbreviation: Temperature_C; Unit: oC; Observation type: surface measurement; In-situ / Manipulation / Response variable: in-situ observation; Measured or calculated: measured; Sampling instrument: Borosilicate bottle; Analyzing instrument: YSI EcoSense EC300A portable conductivity, salinity, and temperature instrument; Detailed sampling and analyzing information: Model EC300A; Researcher name: Ian Enochs; Researcher institution: Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration
  • Parameter or Variable: Salinity calculated from density measurement; Abbreviation: Salinity_Bottle; Unit: psu; Observation type: surface measurement; In-situ / Manipulation / Response variable: IN-SITUOBSERVATION; Measured or calculated: CALCULATED; Sampling instrument: Niskin bottle, stored in borosilicate bottle (125mL, 600mL); Analyzing instrument: Densitometer, Anton Paar DMA XXX; Detailed sampling and analyzing information: 1mL of original seawater sample used for density analysis. Salinity then calculated using density and temperature of sample at time of density measurement through use of the UNESCO Equation of State of Seawater; Researcher name: Ian Enochs; Researcher institution: Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration
  • Parameter or Variable: Depth in meters; Abbreviation: Sample_Depth_m; Unit: m; In-situ / Manipulation / Response variable: in-situ observation; Measured or calculated: measured; Sampling instrument: depth gauge; Researcher name: Ian Enochs; Researcher institution: Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration
  • Parameter or Variable: Aragonite saturation state; Abbreviation: Aragonite_Sat_W; Unit: NA; In-situ / Manipulation / Response variable: IN-SITUOBSERVATION; Measured or calculated: CALCULATED; Sampling instrument: Niskin bottle, stored in borosilicate bottle (125mL, 600mL); Detailed sampling and analyzing information: Same sample bottle for pCO2, pH, DIC, and TA analyses. Refer to DIC for more information on sampling and conservation of samples.; Replicate information: 500-ml sets of duplicate samples; Method reference: Gattuso, J.-P., Epitalon, J.-M., Lavigne, H., & Orr, J. (2019). Seacarb: Seawater carbonate chemistry. R package version 3.2. 12 (version 3.3.1). Retrieved from https://hal.u-pec.fr/UMS-829/hal-02345814v1
  • Parameter or Variable: Spectrophotometric pH; Abbreviation: pH_measured; Unit: Total Scale pH units; In-situ / Manipulation / Response variable: IN-SITUOBSERVATION; Measured or calculated: MEASURED; Sampling instrument: Niskin bottle, stored in borosilicate bottle (125mL, 600mL); Analyzing instrument: Agilent Cary 8454 UV-Vis Spectrophotometer; Detailed sampling and analyzing information: Same sample bottle for pCO2, pH, DIC, and TA analyses. Refer to DIC for more information on sampling and conservation of samples.; Replicate information: 500-ml sets of duplicate samples; Uncertainty: ±0.005 pH units; Method reference: Carter, B. R., Radich, J. A., Doyle, H. L., & Dickson, A. G. (2013). An automated system for spectrophotometric seawater pH measurements. Limnology and Oceanography: Methods, 11(1), 16-27.
Acquisition Information (collection)
Instrument
  • carbon dioxide (CO2) gas analyzer
  • CTD
  • Niskin bottle
  • pH sensor
  • salinometer
  • temperature sensor
  • titrator
Platform
  • R/V F.G. Walton Smith
Last Modified: 2026-02-17T10:53:28Z
For questions about the information on this page, please email: ncei.info@noaa.gov