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Dataset Overview | National Centers for Environmental Information (NCEI)

Fugacity of carbon dioxide (fCO2), temperature, salinity and other variables collected from surface underway observations using shower head equilibrator, carbon dioxide gas detector and other instruments from R/V Roger Revelle cruises in the South Atlantic and Indian Oceans in 2023 (NCEI Accession 0287338)

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This dataset consists of surface underway ocean measurements of fugacity of carbon dioxide (fCO2), salinity, and sea surface temperature collected during R/V Roger Revelle cruises in the South Atlantic and Indian Oceans from 2023-02-04 to 2023-09-13. These measurements were collected with support from NOAA's Climate Program Office (CPO).
  • Cite as: Alin, Simone R.; Collins, Andrew; Feely, Richard A.; Curless, Susan (2024). Fugacity of carbon dioxide (fCO2), temperature, salinity and other variables collected from surface underway observations using shower head equilibrator, carbon dioxide gas detector and other instruments from R/V Roger Revelle cruises in the South Atlantic and Indian Oceans in 2023 (NCEI Accession 0287338). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/3s1w-qn91. Accessed [date].
gov.noaa.nodc:0287338
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  • Originator data format
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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 2023-02-04 to 2023-09-13
Spatial Bounding Box Coordinates
West: -53
East: 115.9
South: -53.3
North: -30.382
Spatial Coverage Map
General Documentation
Associated Resources
  • Dickson, A. G., & et, al. (2007). Guide to best practices for ocean CO2 measurement. . North Pacific Marine Science Organization. https://doi.org/10.25607/obp-1342
  • Feely, R. A., Wanninkhof, R., Milburn, H. B., Cosca, C. E., Stapp, M., & P. Murphy, P. (1998). A new automated underway system for making high precision pCO2 measurements onboard research ships. Analytica Chimica Acta, 377(2–3), 185–191. https://doi.org/10.1016/s0003-2670(98)00388-2
  • Pierrot, D., Neill, C., Sullivan, K., Castle, R., Wanninkhof, R., Lüger, H., Johannessen, T., Olsen, A., Feely, R. A., & Cosca, C. E. (2009). Recommendations for autonomous underway pCO2 measuring systems and data-reduction routines. Deep Sea Research Part II: Topical Studies in Oceanography, 56(8–10), 512–522. https://doi.org/10.1016/j.dsr2.2008.12.005
  • Wanninkhof, R., & Thoning, K. (1993). Measurement of fugacity of CO2 in surface water using continuous and discrete sampling methods. Marine Chemistry, 44(2–4), 189–204. https://doi.org/10.1016/0304-4203(93)90202-y
  • R/V Roger Revelle Underway Lines
  • 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 Pacific Marine Environmental Laboratory Carbon Program.
Publication Dates
  • publication: 2024-05-03
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
Purpose The major objectives of the project were to characterize and map the key indicators of ocean acidification (OA) in Pacific waters, and to continue a time series documenting the distribution of surface and atmospheric fCO2, salinity, temperature, and other parameters.
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: Alin, Simone R.; Collins, Andrew; Feely, Richard A.; Curless, Susan (2024). Fugacity of carbon dioxide (fCO2), temperature, salinity and other variables collected from surface underway observations using shower head equilibrator, carbon dioxide gas detector and other instruments from R/V Roger Revelle cruises in the South Atlantic and Indian Oceans in 2023 (NCEI Accession 0287338). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/3s1w-qn91. Accessed [date].
Cited Authors
Principal Investigators
Collaborators
Contributors
Resource Providers
Publishers
Acknowledgments
  • Funding Information: NOAA Climate Program Office Ocean Observing and Monitoring Division (CPO/OOMD) (Surface water pCO2 measurements from ships)
Theme keywords NODC DATA TYPES THESAURUS NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
Global Change Master Directory (GCMD) Science Keywords OCADS Study Type
  • Surface underway
Provider Variable Abbreviations
  • SAL_PSU
  • SST_C
  • fCO2_SW@SST_uatm, dfCO2_uatm
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 Global Change Master Directory (GCMD) Platform Keywords 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
  • Indian Ocean
Project keywords NODC PROJECT NAMES THESAURUS Cruise ID
  • RR23207
EXPOCODE
  • 33RR20230722
Ocean Acidification Search Keywords
  • Ocean Carbon and Acidification Data System (OCADS) Project
Reference Section ID
  • I05, SOOP Cruises
Keywords NCEI ACCESSION NUMBER
Use Constraints
  • Cite as: Alin, Simone R.; Collins, Andrew; Feely, Richard A.; Curless, Susan (2024). Fugacity of carbon dioxide (fCO2), temperature, salinity and other variables collected from surface underway observations using shower head equilibrator, carbon dioxide gas detector and other instruments from R/V Roger Revelle cruises in the South Atlantic and Indian Oceans in 2023 (NCEI Accession 0287338). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/3s1w-qn91. Accessed [date].
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
  • 2024-05-03T22:44:10Z - NCEI Accession 0287338 v1.1 was published.
Output Datasets
Lineage information for: dataset
Processing Steps
  • Parameter or Variable: pCO2 (fCO2) autonomous; Abbreviation: fCO2_SW@SST_uatm, dfCO2_uatm; Unit: uatm; Observation type: Surface underway; Measured or calculated: Measured; Calculation method and parameters: Fugacity of CO2 is obtained by correcting the partial pressure of CO2 (pCO2) for non-ideality of the gas with respect to molecular interactions between CO2 and other gases in air. See Pierrot et al. for details on how the correction is made.; Sampling instrument: Seawater pump; Location of seawater intake: Bow; Analyzing instrument: General Oceanics 8050; SIO system ID: D19/24407/199; Detailed sampling and analyzing information: The partial pressure of CO2 (pCO2) in the surface ocean was measured throughout the duration of this expedition with a General Oceanics 8050 underway system. Uncontaminated seawater was continuously passed (~2.7 l/min) through a chamber where the seawater concentration of dissolved CO2 was equilibrated with an overlying headspace gas. The CO2 mole fraction of this headspace gas (xCO2) was measured approximately every three minutes via a non-dispersive infrared analyzer (Licor 7000). Roughly every three hours, the system measured four gas standards with known CO2 concentrations certified by the NOAA Earth Science Research Laboratory in Boulder, CO ranging from ~300 – 900 ppm CO2. Additionally, a tank of 99.9995% ultra-high purity nitrogen gas was measured as a baseline 0% CO2 standard. Following measurements of standard gases, six measurements of atmospheric xCO2 were made of air supplied through tubing fastened to the ships mast. Twice a day, the infrared analyzer was calibrated via a zero and span routine using the nitrogen gas and the highest concentration (818.3 ppm) CO2 standard. In addition to measurements of seawater xCO2, atmospheric xCO2, and standard gases, several variables were monitored to evaluate system performance (e.g. gas and water flow rates, pump speeds, equilibrator pressures, etc; Equilibrator type: Shower head; Equilibrator volume: ~0.5 L; Is the equilibrator vented or not: Vented; Water flow rate: 3 L/min; Gas flow rate: ~0.8 L/m; How was temperature inside the equilibrator measured: Hart Scientific model 1523 digital thermometer, serial number 3491888, with an NIST traceable model 5610 thermistor probe, serial number 18150057. Accurate to ± 0.01°C.; How was pressure inside the equilibrator measured: Setra 239 differential pressure transducer, accurate to ± 0.15 hPa. The equilibrator was passively vented to a secondary equilibrator, and the Licor sample output was vented to the laboratory when CO2 measurements were made, thus equilibrator headspace pressure was assumed to be laboratory pressure.; Drying method for gas: From Pierrot et al.: Sample air is dried in a condenser that is cooled to 4-5 oC by a Peltier thermoelectric device. This partially dried air flushes a chamber that is vented and remains at ambient pressure. The dried air inside the chamber is used as the counter flow in the Nafion® tubing. A vacuum pump pulls the dried air from the chamber first through a fixed restrictor and then through the Nafion® tubes, thus creating an absolute pressure and corresponding partial pressure gradient for water vapor across the membrane. When atmospheric air is measured, some of the partially dried air (80-100 ml/min) is pushed through a Nafion® tube, the analyzer and out a vent instead of flushing the chamber. The headspace gas, when being measured, is circulated in a closed loop through the analyzer at a rate similar to that of the atmospheric air (80-100 ml/min). It is dried first in the condenser, then in a Nafion® tube prior to entering the analyzer and being returned to the equilibrator. Typically, the water mole fraction (xH2O) in the dried gas is about 2 parts per thousand (ppt), which corresponds to a dew point temperature of about -20 °C. The liquid water condensed out of the sample air streams is removed by peristaltic pumps into the vent equilibrator at intervals determined by the user.; SEA CO2 gas detector manufacturer: Licor, Inc; SEA CO2 gas detector model: Licor 7000, IRG4-1354; SEA CO2 gas detector resolution: 0.2 µatm; SEA CO2 gas detector uncertainty: 0.3 µatm for equilibrator measurements, 0.2 µatm for atmospheric measurements; Standardization technique: The system runs a full cycle in approximately six hours. The cycle starts with four standard gases composed of a known quantity of CO2 in air, a gas composed of 100% ultra-high purity nitrogen, then measures six atmopheric samples followed by 60 surface water samples. The gas detector runs a zero and span routine twice daily, using the nitrogen and highest CO2 gas standard, respectively.; Standardization frequency: Every three hours; Standard gas manufacturer: Standard gases are supplied by NOAA’s Earth System Research Laboratory, Global Monitoring Division, in Boulder, CO, and are directly traceable to the WMO scale.; Standard gas concentration: LL55868 = 283.42 ppm CO2, LL127199 = 399.51 ppm CO2, LL127204 = 539.97 ppm CO2, LL127176 = 911.41 ppm CO2; Standard gas uncertainty: 0.01 ppm; Water vapor correction method: Details of the data reduction are described in Pierrot, et.al. (2009).; Temperature correction method: Details of the data reduction are described in Pierrot, et.al. (2009).; At what temperature was pCO2 reported: In situ sea surface temperature; Uncertainty: ± 0.01°C; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Method reference: Pierrot, D.; Neill, C.; Sullivan, K.; Castle, R.; Wanninkhof, R.; Luger, H.; Johannessen, T.; Olsen, A.; Feely, R.A.; and Cosca, C.E. (2009). Recommendations for autonomous underway pCO2 measuring systems and data-reduction routines. Deep-Sea Res., II, v. 56, pp. 512-522.; Researcher name: Collins, A.U.; Researcher institution: Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration
  • Parameter or Variable: Sea Surface Temperature; Abbreviation: SST_C; Unit: Degrees Celsius; Observation type: Surface Underway; Sampling instrument: In-situ observation; Analyzing instrument: Seabird sensors. Details of the data reduction are described in Pierrot, et.al. (2009). Instrumentation is factory calibrated annually.; Uncertainty: 0.0025°C; Quality flag convention: WOCE_QC_FLAG
  • Parameter or Variable: Sea Surface Salinity; Abbreviation: SAL_PSU; Observation type: Surface Underway; Sampling instrument: Uncontaminated seawater supply; Analyzing instrument: Seabird sensors. Details of the data reduction are described in Pierrot, et.al. (2009). Instrumentation is factory calibrated annually.; Uncertainty: 0.005 PSU; Quality flag convention: WOCE_QC_FLAG
Acquisition Information (collection)
Instrument
  • barometric pressure sensor
  • carbon dioxide (CO2) gas analyzer
  • showerhead equilibrator
  • temperature sensor
  • thermosalinograph
Platform
  • R/V Roger Revelle
Last Modified: 2025-11-29T07:52:42Z
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