gov.noaa.nodc:0206574 eng utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NOAA Contact Information Information for contacts at NCEI. information custodian 2026-03-26T07:26:53Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Surface underway measurements of partial pressure of carbon dioxide (pCO2) and other parameters from Saildrone TPOS_2017_SD1006 in the North and Tropical Pacific Ocean from 2017-09-02 to 2018-05-18 (NCEI Accession 0206574) 2019-11-06 publication 2019-11-06 creation International DOI Foundation (IDF) 10.25921/fbzk-s357 NOAA National Centers for Environmental Information gov.noaa.nodc:0206574 NCEI Archive Management System 0206574 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information publisher Adrienne J. Sutton NOAA Pacific Marine Environmental Laboratory (PMEL) Adrienne.Sutton@noaa.gov https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information resourceProvider NOAA Pacific Marine Environmental Laboratory (PMEL) https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information resourceProvider Adrienne Sutton NOAA Pacific Marine Environmental Laboratory (PMEL) Adrienne.Sutton@noaa.gov https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information principalInvestigator Stacy Maenner Jones NOAA Pacific Marine Environmental Laboratory (PMEL) stacy.maenner@noaa.gov https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information collaborator Roman Battisti University of Washington Cooperative Institute for Climate, Ocean and Ecosystem Studies (CICOES) roman.battisti@noaa.gov https://cicoes.uw.edu/ HTTPS University of Washington Cooperative Institute for Climate, Ocean and Ecosystem Studies (CICOES) website Institution web page information collaborator Randy Bott NOAA Pacific Marine Environmental Laboratory (PMEL) https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information collaborator Sutton, Adrienne J. NOAA Pacific Marine Environmental Laboratory (PMEL) https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information author Maenner Jones, Stacy NOAA Pacific Marine Environmental Laboratory (PMEL) stacy.maenner@noaa.gov https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information author Battisti, Roman University of Washington Cooperative Institute for Climate, Ocean and Ecosystem Studies (CICOES) roman.battisti@noaa.gov https://cicoes.uw.edu/ HTTPS University of Washington Cooperative Institute for Climate, Ocean and Ecosystem Studies (CICOES) website Institution web page information author Bott, Randy NOAA Pacific Marine Environmental Laboratory (PMEL) https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information author NOAA Pacific Marine Environmental Laboratory (PMEL) https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information contributor tableDigital This dataset includes surface chemical, meteorological, physical data collected from Saildrone TPOS_2017_SD1006 in the North and Tropical Pacific Ocean from 2017-09-02 to 2018-05-18. These data include mole fraction of CO2 in air in equilibrium with the seawater at sea surface temperature and measured humidity, mole fraction of CO2 in air from airblock, 4 feet above the sea surface at measured humidity, barometric pressure, LICOR temperature and pressure, oxygen percent saturation, partial pressure of carbon dioxide in water, partial pressure of carbon dioxide in atmosphere, difference of the partial pressure of CO2 in seawater and air (pCO2 SW - pCO2 Air) and pH on total scale. The Autonomous Surface Vehicle CO2 (ASVCO2) instruments used to collect these data include Bubble type equilibrator for autonomous carbon dioxide (CO2) measurement, Carbon dioxide (CO2) gas analyzer, Humidity Sensor, and oxygen meter. This dataset is available to the public for a wide variety of uses including scientific research and analysis. Funding Information: NOAA Climate Program (Saildrones) Funding Information: NOAA completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information pointOfContact asNeeded https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0206574 Preview graphic PNG 0206574 NCEI ACCESSION NUMBER 2019-11-04 publication AIR-SEA DIFFERENCE - PARTIAL PRESSURE (OR FUGACITY) OF CARBON DIOXIDE Partial pressure (or fugacity) of carbon dioxide - atmosphere partial pressure of carbon dioxide - water pH SALINITY - SURFACE WATER WATER TEMPERATURE theme NODC DATA TYPES THESAURUS barometric pressure sensor carbon dioxide (CO2) gas analyzer oxygen sensor showerhead equilibrator temperature sensor instrument NODC INSTRUMENT TYPES THESAURUS chemical meteorological physical surface underway theme NODC OBSERVATION TYPES THESAURUS NOAA Pacific Marine Environmental Laboratory dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS NOAA Pacific Marine Environmental Laboratory dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS Ship of Opportunity Programme (SOOP) project NODC PROJECT NAMES THESAURUS North Pacific Ocean place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication DOC/NOAA/OAR/PMEL > Pacific Marine Environmental Laboratory, OAR, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 information custodian Saildrone_TPOS_2017_SD1006_Sep2017_May2018 project Cruise ID 32DB20170902 project EXPOCODE Ocean Carbon and Acidification Data System (OCADS) Project project Ocean Acidification Search Keywords Saildrones lines project Reference Section ID EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > CARBON AND HYDROCARBON COMPOUNDS > ATMOSPHERIC CARBON DIOXIDE > PARTIAL PRESSURE OF CARBON DIOXIDE EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > SURFACE SALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 information custodian Autonomous Surface Vehicle (ASV) Surface underway theme OCADS Study Type Saildrone_TPOS_2017_SD1006_Sep2017_May2018 theme Provider Keywords %O2 CO2 Air QF CO2 SW QF Delta fCO2 (fCO2 SW - fCO2 Air) H2O Air H2O SW Licor Atm Pressure Licor Temp Pressure of Licor SS Salinity SST dpCO2 fCO2 Air (sat) fCO2 SW (sat) pCO2 Air (wet) pCO2 SW (wet) pH (total scale) xCO2 Air (dry) xCO2 Air (wet) xCO2 SW (dry) xCO2 SW (wet) theme Provider Variable Abbreviations BAROMETERS > BAROMETERS CO2 ANALYZERS > CO2 ANALYZERS EQUILIBRATORS OXYGEN METERS > OXYGEN METERS TEMPERATURE SENSORS > TEMPERATURE SENSORS instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 information custodian Saildrone platform Global Change Master Directory (GCMD) Platform Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 information custodian Saildrone platform Platform Keywords autonomous surface water vehicle platform SeaVoX Platform Categories OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN place Global Change Master Directory (GCMD) Location Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. 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 information custodian Pacific Ocean place Provider Geographic Names accessLevel: Public otherRestrictions Cite as: Sutton, Adrienne J.; Maenner Jones, Stacy; Battisti, Roman; Bott, Randy (2019). Surface underway measurements of partial pressure of carbon dioxide (pCO2) and other parameters from Saildrone TPOS_2017_SD1006 in the North and Tropical Pacific Ocean from 2017-09-02 to 2018-05-18 (NCEI Accession 0206574). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/fbzk-s357. Accessed [date]. 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. otherRestrictions 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. Sutton, A. J., Sabine, C. L., Maenner-Jones, S., Lawrence-Slavas, N., Meinig, C., Feely, R. A., Mathis, J. T., Musielewicz, S., Bott, R., McLain, P. D., Fought, H. J., & Kozyr, A. (2014). A high-frequency atmospheric and seawater pCO2 data set from 14 open-ocean sites using a moored autonomous system. Earth System Science Data, 6(2), 353–366. https://doi.org/10.5194/essd-6-353-2014 2014-11-06 publication International DOI Foundation (IDF) https://doi.org/10.5194/essd-6-353-2014 https://doi.org/10.5194/essd-6-353-2014 HTTPS https://doi.org/10.5194/essd-6-353-2014 related journal article information Sutton, A. J. Pacific Marine Environmental Laboratory author Sabine, C. L. author Maenner-Jones, S. author Lawrence-Slavas, N. author Meinig, C. author Feely, R. A. author Mathis, J. T. author Musielewicz, S. author Bott, R. author McLain, P. D. author Fought, H. J. author Kozyr, A. author Copernicus GmbH publisher documentDigital Earth Syst. Sci. Data 6(2) ISSN 1866-3516, pp. 353-366 crossReference project Autonomous Surface Vehicle (ASV) Data 2022 publication https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/ASV/ HTTPS https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/ASV/ Related resource information NOAA National Centers for Environmental Information (NCEI) publisher documentDigital crossReference project 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 2022-04 publication https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system HTTPS https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system OCADS website information NOAA National Centers for Environmental Information author NOAA National Centers for Environmental Information (NCEI) publisher documentDigital [accessed 2024-02-08] crossReference program eng; USA utf8 environment oceans climatologyMeteorologyAtmosphere -143.21 -121.556 3.798 37.794 2017-09-02 2018-05-18 NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov pointOfContact 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. Contact NCEI for other distribution options and instructions. CSV 0.808 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0206574.html HTTPS Web browser Project Metadata Navigate directly to the URL for a descriptive web page with download links. information https://doi.org/10.25921/fbzk-s357 HTTPS Web browser NCEI Dataset Landing Page Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/oas/206574 HTTPS Web browser Descriptive Information Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/download/206574 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0148/0206574/ FTP Any FTP client FTP 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). download dataset NCEI Accession 0206574 v1.1 was published. 2019-11-06T19:56:10Z NCEI Accession 0206574 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0206574/1.1 HTTPS NCEI Accession 0206574 v1.1 published 2019-11-06T19:56:10Z download dataset Parameter or Variable: xCO2 SW (wet); Abbreviation: xCO2 SW (wet); Unit: [μmol/mol]; Controlled vocabulary name: partial pressure of carbon dioxide - water; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation; Sampling instrument: ASVCO2 (NOAA trademark); Analyzing instrument: Absolute, non-dispersive infrared (NDIR) gas analyzer; LI-820; Sensor manufacturer: NOAA PMEL; Duration: 1hr cycle; Detailed sampling and analyzing information: At the beginning of each sample, the instrument self-calibrates using a zero and high standard. The zero standard is generated by cycling a small amount of air through a soda lime chamber. The high standard is from a cylinder of calibrated standard reference gas, 396.21 umol/mol, from ESRL. ESRL standards are traceable to WMO x93 scale with a stated reproducibility of 0.06 micromole/mole. For more information on estimates of accuracy and precision of the MAPCO2 system, see Sutton et al. 2014.; Uncertainty: Resolution_Water - 0.7 uatm; Uncertainty_Water - 2 uatm; Resolution_Air - 0.6 uatm; Uncertainty_Air - 1 uatm; Method reference: Sutton, A.J., Sabine, C.L., Maenner-Jones, S., Lawrence-Slavas, N., Meinig, C., Feely, R.A., Mathis, J.T., Musielewicz, S., Bott, R., McLain, P.D., Fought, J., Kozyr, A., 2014. A high-frequency atmospheric and seawater pCO2 data set from 14 open ocean sites using a moored autonomous system. Earth Sys. Sci. Data, 6, https://doi.org/10.5194/essd-6-353-2014, 353-366. Parameter or Variable: H2O SW; Abbreviation: H2O SW; Unit: [mmol/mol]; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation; Sampling instrument: ASVCO2 (NOAA trademark); Sensor manufacturer: NOAA PMEL Parameter or Variable: xCO2 Air (wet); Abbreviation: xCO2 Air (wet); Unit: [μmol/mol]; Controlled vocabulary name: Partial pressure (or fugacity) of carbon dioxide - atmosphere; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation; Sampling instrument: ASVCO2 (NOAA trademark); Sensor manufacturer: NOAA PMEL Parameter or Variable: H2O Air; Abbreviation: H2O Air; Unit: [mmol/mol]; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation; Sampling instrument: ASVCO2 (NOAA trademark); Sensor manufacturer: NOAA PMEL Parameter or Variable: Pressure of Licor; Abbreviation: Pressure of Licor; Unit: [hPa]; In-situ / Manipulation / Response variable: in-situ observation; Sampling instrument: ASVCO2 (NOAA trademark); Sensor manufacturer: NOAA PMEL Parameter or Variable: Licor Temp; Abbreviation: Licor Temp; Unit: [Deg. C]; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation; Sampling instrument: ASVCO2 (NOAA trademark); Sensor manufacturer: NOAA PMEL Parameter or Variable: SST; Abbreviation: SST; Unit: [Deg. C]; Controlled vocabulary name: SEA SURFACE TEMPERATURE; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: SS Salinity; Abbreviation: SS Salinity; Controlled vocabulary name: SALINITY; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: xCO2 SW (dry); Abbreviation: xCO2 SW (dry); Unit: [μmol/mol]; Controlled vocabulary name: partial pressure of carbon dioxide - water; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: xCO2 Air (dry); Abbreviation: xCO2 Air (dry); Unit: [μmol/mol]; Controlled vocabulary name: Partial pressure (or fugacity) of carbon dioxide - atmosphere; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: fCO2 SW (sat); Abbreviation: fCO2 SW (sat); Unit: [uatm]; Controlled vocabulary name: partial pressure of carbon dioxide - water; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: fCO2 Air (sat); Abbreviation: fCO2 Air (sat); Unit: [uatm]; Controlled vocabulary name: Partial pressure (or fugacity) of carbon dioxide - atmosphere; Observation type: surface underway; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: Delta fCO2 (fCO2 SW - fCO2 Air); Abbreviation: Delta fCO2 (fCO2 SW - fCO2 Air); Unit: [uatm]; Controlled vocabulary name: AIR-SEA DIFFERENCE - PARTIAL PRESSURE (OR FUGACITY) OF CARBON DIOXIDE; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: CO2 SW QF; Abbreviation: CO2 SW QF; Unit: Flag for xCO2 sw (wet); In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: CO2 Air QF; Abbreviation: CO2 Air QF; Unit: Quality Flag for xCO2 Air (wet); In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: Licor Atm Pressure; Abbreviation: Licor Atm Pressure; Unit: (hPa) Atmospheric pressure at the airblock, 4 feet above the sea surface.; Controlled vocabulary name: BAROMETRIC PRESSURE; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: %O2; Abbreviation: %O2; Unit: The percent oxygen of the surface seawater divided by the percent oxygen of the atmosphere at 4 feet above the sea surface. Disclaimer: The oxygen measurement is made in the equilibrated air. We have found that the oxygen does not come to complete equilibrium so any rapid changes in oxygen do not get properly captured using this system. Therefore, we tend to use the oxygen data only as a qualitative sense of the biology. It is not a quantitative measure.; Controlled vocabulary name: OXYGEN - PERCENT SATURATION; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: pCO2 SW (wet); Abbreviation: pCO2 SW (wet); Unit: (uatm) Partial Pressure of CO2 in air in equilibrium with the seawater at sea surface temperature (100% humidity); Controlled vocabulary name: partial pressure of carbon dioxide - water; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: pCO2 Air (wet); Abbreviation: pCO2 Air (wet); Unit: (uatm) Partial Pressure of CO2 in air at the airblock, 4 feet above the sea surface (100% humidity).; Controlled vocabulary name: Partial pressure (or fugacity) of carbon dioxide - atmosphere; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: dpCO2; Abbreviation: dpCO2; Unit: Difference of the partial pressure of CO2 in seawater and air (pCO2 SW - pCO2 Air; Controlled vocabulary name: AIR-SEA DIFFERENCE - PARTIAL PRESSURE (OR FUGACITY) OF CARBON DIOXIDE; In-situ / Manipulation / Response variable: in-situ observation Parameter or Variable: pH on Total Scale; Abbreviation: pH (total scale); Controlled vocabulary name: pH; In-situ / Manipulation / Response variable: in-situ observation asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian barometric pressure sensor barometric pressure sensor instrument used to measure the atmospheric pressure. carbon dioxide (CO2) gas analyzer carbon dioxide (CO2) gas analyzer measures gaseous carbon dioxide Carbon dioxide gas analyzer has often been referred to as LI-COR, because a lot of researchers choose to use products manufactured by LI-COR incorporation for their carbon dioxide measurement. The main component of a carbon dioxide analyzer is a nondispersive infrared (NDIR) spectroscopic sensors to detect CO2 in a gaseous environment by its characteristic absorption. Carbon dioxide (CO2) gas analyzer works together with carbon dioxide (CO2) equilibrator (insttypes_id 184) to measure carbon dioxide in the water. To measure water carbon dioxide, water needs to be continuously supplied to a showerhead inside an equilibrator. As the water flows through the equilibrator chamber, dissolved carbon dioxide exchanges quickly with air in the headspace. This air is then sampled by the carbon dioxide analyzer to determine the mole fraction of CO2 in water. oxygen sensor oxygen sensor Any instrument that measures oxygen content in a compound. showerhead equilibrator showerhead equilibrator extracts dissolved CO2 from water A carbon dioxide equilibrator is usually in the shape of a vertical tube, with a showerhead on the top, some headspace, a lot of beads to increase the surface exchange area between water and air, a water seal device at the bottom to allow water to overflow, but prevents air exchange between inside and outside. Carbon dioxide (CO2) equilibrator works together with carbon dioxide (CO2) gas analyzer (insttypes_id 183) to measure carbon dioxide in the water. To measure water carbon dioxide, water needs to be continuously supplied to a showerhead inside an equilibrator. As the water flows through the equilibrator chamber, dissolved carbon dioxide exchanges quickly with air in the headspace. This air is then sampled by the carbon dioxide analyzer to determine the mole fraction of CO2 in water. temperature sensor temperature sensor A sensor used to measure temperature.