gov.noaa.nodc:0308102 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 2026-03-26T08:49:10Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Dissolved inorganic carbon (DIC), total alkalinity (TA), pH on total scale, dissolved organic carbon (DOC), chlorofluorocarbons (CFC11, CFC12, CFC113), water temperature, salinity, dissolved oxygen, nutrients and other hydrographic and chemical variables collected from discrete samples and profile observations during the R/V Thomas G. Thompson cruise on GO-SHIP repeat section I08S (EXPOCODE 325020240221) in the Indian Ocean, Southern Ocean from 2024-02-21 to 2024-04-01 (NCEI Accession 0308102) 2025-09-19 publication 2025-09-19 creation International DOI Foundation (IDF) 10.25921/q83e-ab97 NOAA National Centers for Environmental Information gov.noaa.nodc:0308102 NCEI Archive Management System 0308102 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 Karen Stocks Scripps Institution of Oceanography (SIO) kstocks@ucsd.edu https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information resourceProvider CLIVAR and Carbon Hydrographic Data Office (CCHDO) http://cchdo.ucsd.edu HTTP CLIVAR and Carbon Hydrographic Data Office (CCHDO) website Institution web page information resourceProvider Sébastien P. Bigorre Woods Hole Oceanographic Institution (WHOI) sbigorre@whoi.edu http://www.whoi.edu HTTP Woods Hole Oceanographic Institution (WHOI) website Institution web page information principalInvestigator Richard Feely NOAA Pacific Marine Environmental Laboratory (PMEL) Richard.A.Feely@noaa.gov https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information principalInvestigator Rik Wanninkhof NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) Rik.Wanninkhof@noaa.gov https://www.aoml.noaa.gov/ HTTPS NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) website Institution web page information principalInvestigator Andrew G. Dickson Scripps Institution of Oceanography (SIO) adickson@ucsd.edu https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information principalInvestigator Lynne Talley Scripps Institution of Oceanography (SIO) https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information principalInvestigator Susan Becker Scripps Institution of Oceanography (SIO) https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information principalInvestigator Todd Martz Scripps Institution of Oceanography (SIO) trmartz@ucsd.edu https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information principalInvestigator Roberta Hansman Woods Hole Oceanographic Institution (WHOI) http://www.whoi.edu HTTP Woods Hole Oceanographic Institution (WHOI) website Institution web page information principalInvestigator Craig A. Carlson University of California, Santa Barbara (UCSB) http://www.ucsb.edu HTTP University of California, Santa Barbara (UCSB) website Institution web page information principalInvestigator Bigorre, Sebastien P. Woods Hole Oceanographic Institution (WHOI) sbigorre@whoi.edu http://www.whoi.edu HTTP Woods Hole Oceanographic Institution (WHOI) website Institution web page information author Feely, Richard A. NOAA Pacific Marine Environmental Laboratory (PMEL) https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information author Wanninkhof, Rik NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) https://www.aoml.noaa.gov/ HTTPS NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) website Institution web page information author Dickson, Andrew G. Scripps Institution of Oceanography (SIO) adickson@ucsd.edu https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information author Talley, Lynne D. Scripps Institution of Oceanography (SIO) https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information author Becker, Susan Scripps Institution of Oceanography (SIO) https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information author Martz, Todd R. Scripps Institution of Oceanography (SIO) https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information author Carlson, Craig A. University of California, Santa Barbara (UCSB) http://www.ucsb.edu HTTP University of California, Santa Barbara (UCSB) website Institution web page information author Hansman, Roberta Woods Hole Oceanographic Institution (WHOI) http://www.whoi.edu HTTP Woods Hole Oceanographic Institution (WHOI) website Institution web page information author University of California, Santa Barbara (UCSB) http://www.ucsb.edu HTTP University of California, Santa Barbara (UCSB) website Institution web page information contributor NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) https://www.aoml.noaa.gov/ HTTPS NOAA Atlantic Oceanographic and Meteorological Laboratory (AOML) website Institution web page information contributor Woods Hole Oceanographic Institution (WHOI) http://www.whoi.edu HTTP Woods Hole Oceanographic Institution (WHOI) website Institution web page information contributor NOAA Pacific Marine Environmental Laboratory (PMEL) https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information contributor Scripps Institution of Oceanography (SIO) https://scripps.ucsd.edu/ HTTPS Scripps Institution of Oceanography (SIO) website Institution web page information contributor tableDigital This dataset includes discrete profile measurements of Dissolved inorganic carbon (DIC), total alkalinity (TA), pH on total scale, dissolved organic carbon (DOC), chlorofluorocarbons (CFC11, CFC12, CFC113), water temperature, salinity, dissolved oxygen, nutrients and other hydrographic and chemical variables collected from discrete samples and profile observations during the R/V Thomas G. Thompson cruise on GO-SHIP repeat section I08S (EXPOCODE 325020240221) in the Indian Ocean, Southern Ocean from 2024-02-21 to 2024-04-01. GO-SHIP repeat transoceanic surveys (www.goship.org) provide full water column hydrographic observations with temporal and spatial resolutions adequate to resolve decadal variability in oceanic storage of heat, freshwater, carbon, oxygen, nutrients and transient tracers. Repeat hydrographic physical-biogeochemical measurements nominally in Indian Ocean enables scientists to better tackle important unresolved aspects of the Indian and Southern Ocean's response to decadal scale variability and increases in both heat and carbon dioxide as a result of anthropogenic activities. The I08S 2024 cruise aboard the UNOLS vessel R/V Thomas G. Thompson was undertaken as part of the US GO-SHIP (Global Ocean Ship-based Hydrographic Investigations Program), a major contributor to international GO-SHIP. The program’s overall objective is to collect quasi-decadal, highly accurate, surface-to-bottom, coast-to-coast, physical, and chemical oceanic observations. These measurements are essential to monitoring long-term changes in heat, freshwater, carbon, oxygen, and other tracers in the global ocean, the main reservoir in the Earth System. This dataset is available to the public for a wide variety of uses including scientific research and analysis. Funding Information: National Science Foundation, National Oceanic and Atmospheric Administration (GO-SHIP) 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:0308102 Preview graphic PNG 0308102 NCEI ACCESSION NUMBER 2025-09-19 publication CHLOROFLUOROCARBON-11 (CFC-11) CHLOROFLUOROCARBON-113 (CFC-113) CHLOROFLUOROCARBON-12 (CFC-12) DELTA CARBON-14 DISSOLVED INORGANIC CARBON (DIC) NITRATE NITRITE nitrous oxide (N2O) OXYGEN PARTICULATE ORGANIC CARBON pH phosphate SALINITY silicate sulfur hexafluoride (SF6) total alkalinity WATER TEMPERATURE theme NODC DATA TYPES THESAURUS carbon dioxide (CO2) gas analyzer CTD Niskin bottle nutrient autoanalyzer oxygen sensor pH sensor salinometer temperature sensor titrator instrument NODC INSTRUMENT TYPES THESAURUS chemical discrete sample physical profile theme NODC OBSERVATION TYPES THESAURUS R/V THOMAS G. THOMPSON platform NODC PLATFORM NAMES THESAURUS NOAA Atlantic Oceanographic and Meteorological Laboratory NOAA Pacific Marine Environmental Laboratory Scripps Institution of Oceanography University of California, Santa Barbara Woods Hole Oceanographic Institution dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS CLIVAR and Carbon Hydrographic Data Office dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS GLOBAL OCEAN DATA ANALYSIS PROJECT (GLODAP) The Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) project NODC PROJECT NAMES THESAURUS Indian Ocean Southern Ocean place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication CLIVAR/CCHDO > CLIVAR and Carbon Hydrographic Data Office DOC/NOAA/OAR/AOML > Atlantic Oceanographic and Meteorological Laboratory, OAR, NOAA, U.S. Department of Commerce DOC/NOAA/OAR/PMEL > Pacific Marine Environmental Laboratory, OAR, NOAA, U.S. Department of Commerce WHOI > WOODS HOLE OCEANOGRAPHIC INSTITUTION 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 TN430 project Cruise ID 325020240221 project EXPOCODE GLODAP > Global Ocean Data Analysis Project project Global Change Master Directory (GCMD) Project 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 Ocean Carbon and Acidification Data System (OCADS) Project project Ocean Acidification Search Keywords GO-SHIP I08S project Reference Section ID The Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) project Research Projects EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE 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 Discrete measurement Profile theme OCADS Study Type ALKALI CFC11, CFC12, CFC113 CTDSAL CTDTMP DOC OXYGEN PH_TOT SILCAT, NITRAT, NITRIT, PHSPHT TCARBN theme Provider Variable Abbreviations AUTOANALYZER > AUTOANALYZER CO2 ANALYZERS > CO2 ANALYZERS CTD > Conductivity, Temperature, Depth NISKIN BOTTLES OXYGEN METERS > OXYGEN METERS PH METERS > PH METERS SALINOMETERS 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 THOMAS G. THOMPSON (call sign: KTDQ, ICES code: 3250, 1991-) platform ICES/SeaDataNet Ship Codes OCEAN > INDIAN OCEAN OCEAN > SOUTHERN 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 Indian Ocean Southern Ocean place Provider Geographic Names accessLevel: Public otherRestrictions Cite as: Bigorre, Sebastien P.; Feely, Richard A.; Wanninkhof, Rik; Dickson, Andrew G.; Talley, Lynne D.; Becker, Susan; Martz, Todd R.; Carlson, Craig A.; Hansman, Roberta (2025). Dissolved inorganic carbon (DIC), total alkalinity (TA), pH on total scale, dissolved organic carbon (DOC), chlorofluorocarbons (CFC11, CFC12, CFC113), water temperature, salinity, dissolved oxygen, nutrients and other hydrographic and chemical variables collected from discrete samples and profile observations during the R/V Thomas G. Thompson cruise on GO-SHIP repeat section I08S (EXPOCODE 325020240221) in the Indian Ocean, Southern Ocean from 2024-02-21 to 2024-04-01 (NCEI Accession 0308102). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/q83e-ab97. 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. license These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0). SPDX License: Creative Commons Zero v1.0 Universal (CC0-1.0) GO-SHIP, CLIVAR Repeat Sections I08S/I08N 2022 publication https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/RepeatSections/clivar_i08s.html HTTPS https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/RepeatSections/clivar_i08s.html Related resource information NOAA National Centers for Environmental Information (NCEI) publisher documentDigital crossReference project Alin, Simone R.; Curless, Susan; Herndon, Julian; Feely, Richard A. (2025). 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 Thomas G. Thompson cruises in the South Pacific Ocean, Indian Ocean, Southern Ocean in 2024 (NCEI Accession 0304490). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/0e2m-2111. 2025-05-22 publication International DOI Foundation (IDF) https://doi.org/10.25921/0e2m-2111 NOAA National Centers for Environmental Information gov.noaa.nodc:0304490 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0304490.html HTTPS https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0304490.html Related dataset information Alin, Simone R. NOAA Pacific Marine Environmental Laboratory (PMEL) https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information author Curless, Susan NOAA Pacific Marine Environmental Laboratory (PMEL) susan.curless@noaa.gov https://www.pmel.noaa.gov/ HTTPS NOAA Pacific Marine Environmental Laboratory (PMEL) website Institution web page information author Herndon, Julian University of Washington Joint Institute for the Study of the Atmosphere and Ocean (JISAO) https://cicoes.uw.edu/ HTTPS University of Washington Cooperative Institute for Climate, Ocean and Ecosystem Studies (CICOES) website Institution web page information author Feely, Richard A. 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 National Centers for Environmental Information (NCEI) publisher tableDigital crossReference project 325020240221 CCHDO Data Link publication https://cchdo.ucsd.edu/cruise/325020240221 HTTPS https://cchdo.ucsd.edu/cruise/325020240221 Related resource information documentDigital crossReference project 325020240221_do CCHDO cruise report publication https://cchdo.ucsd.edu/data/41691/325020240221_do.pdf HTTPS https://cchdo.ucsd.edu/data/41691/325020240221_do.pdf Related resource information documentDigital crossReference project Data Management Support for the International Global Ocean Carbon and Repeat Hydrography Program 2022 publication https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/RepeatSections/ HTTPS https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/RepeatSections/ 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 76.2 95.9 -67.114 -28.318 2024-02-21 2024-04-01 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. Originator data format 16.152 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0308102.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/q83e-ab97 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/308102 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/308102 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0239/0308102/ 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 0308102 v1.1 was published. 2025-09-19T18:14:45Z NCEI Accession 0308102 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0308102/1.1 HTTPS NCEI Accession 0308102 v1.1 published 2025-09-19T18:14:45Z download dataset Parameter or Variable: Dissolved Inorganic Carbon; Abbreviation: TCARBN; Unit: UMOL/KG; Observation type: Discrete, bottle; Measured or calculated: Measured; Sampling instrument: Niskin Bottles; Analyzing instrument: coulometry with analytical system; Detailed sampling and analyzing information: DIC measurements were drawn according to procedures outlined in the PICES Publication, Guide to Best Practices for Ocean CO2 Measurements [Dickson07], from Niskin bottles into 540 ml borosilicate glass bottles using silicone tubing. The flasks were rinsed three times and filled from the bottom with care not to entrain any bubbles, overflowing by one half- to one full-volume. The sample tube was pinched off and withdrawn, creating a ~6 ml headspace, followed by the addition of 0.2 ml of saturated HgCl2 solution as a preservative. The sample bottles were then sealed with glass stoppers lightly coated with Apiezon-L grease and were stored at room temperature for a maximum of 12-24 hours until analysis. The analysis was done by coulometry with two analytical systems (PMEL DICE 3 “Eagle” and AOML DICE 6) used simultaneously on the cruise. Each system consisted of a coulometer (CM5011 on DICE 3 and CM50170 on DICE 6, UIC Inc) coupled with a Dissolved Inorganic Carbon Extractor (DICE). The DICE system was developed by Esa Peltola and Denis Pierrot of NOAA/AOML and Dana Greeley of NOAA/PMEL to modernize a carbon extractor called SOMMA (Johnson et al. [Johnson85], [Johnson87], [Johnson93], and [Johnson99]; Johnson [Johnson92]). The two DICE systems were set up in the forward, port side Bio Lab onboard the RV Thomas G. Thompson. In coulometric analysis of DIC, all carbonate species are converted to CO2 (gas) by addition of excess hydrogen ion (acid) to the seawater sample, and the evolved CO2 gas is carried into the titration cell of the coulometer with CO2 free pure air or compressed nitrogen, where it reacts quantitatively with a proprietary reagent based on ethanolamine to generate hydrogen ions. In this process, the solution changes from blue to colorless, triggering a current through the cell and causing coulometrical generation of OH- ions at the anode. The OH- ions react with the H+, and the solution turns blue again. A beam of light is transmitted through the solution, and a photometric detector at the opposite side of the cell measures the change in light transmission. Once the percent transmission reaches its original value, the coulometric titration is stopped, and the amount of CO2 that entered the cell is determined by integrating the total change during the titration. All DIC valueswere recalculated to a molarweight (μmol/kg) using density derived from the CTD’s salinity sensor. The DIC values were corrected for dilution due to the addition of 0.2 ml of saturated HgCl2 used for sample preservation. A correction was also applied for the offset from the CRM. This additive correction was applied for each cell using the CRM value obtained at the beginning of the cell. The coulometer cell solution was replaced after 25 – 28 mg of carbon was titrated, typically after 9 – 12 hours of continuous use.; Standardization description: The precision of the two DICE systems can be demonstrated via the replicate samples. Approximately 13% of the Niskins sampled had analytical replicates taken as a check of our precision. These replicate samples were interspersed throughout the station analysis for quality assurance and integrity of the coulometer cell solutions. The pipette volume was determined by taking aliquots of distilled water from volumes at known temperatures. The weights with the appropriate densities were used to determine the volume of the pipettes.; Standardization frequency: Daily; CRM manufacturer: Andrew Dickson Laboratory at SIO; CRM batch number: 113, 208; Preservation method: Mercuric chloride solution; Preservative volume: 200 μL; Uncertainty: The accuracy of the DICE measurement is evaluated with the use of CRMs, consisting of filtered and UV irradiated seawater, supplied by Dr. A. Dickson of Scripps Institution of Oceanography (SIO). The CRM accuracy is determined manometrically on land in San Diego and the DIC data reported to the data base have been corrected to the CRM values for the two batches used (213 and 208). The CRM value for these batches are 2024.67 and 2059.66 μmol/kg respectively. The precision of the two DICE systems can be demonstrated via the replicate samples. Approximately 11% of the niskins sampledwere duplicates taken as a check of our precision. These replicate sampleswere interspersed throughout the station analysis for quality assurance and integrity of the coulometer cell solutions. The average difference for these duplicates on AOML3 and 4 respectively are 1.74 μmol/kg and 1.38 μmol/kg - No major systematic differences between the replicates were observed.; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Method reference: Guide to Best Practices for Ocean CO2 Measurements [Dickson2007]); Researcher name: Rik Wanninkhoff, Richard Feely; Researcher institution: NOAA/PMEL/AOML Parameter or Variable: Total alkalinity; Abbreviation: ALKALI; Unit: UMOL/KG; Observation type: Discrete, bottle; Measured or calculated: Measured; Sampling instrument: Niskin Bottles; Type of titration: Potentiometric; Cell type (open or closed): Open; Detailed sampling and analyzing information: Samples are dispensed using a Sample Delivery System (SDS) which has been calibrated for volume in the lab prior to the cruise. Its volume is confirmed immediately before use at sea to ensure a consistent volume will be delivered for each sample. The SDS consists of a volumetric pipette, various relay valves, an air pump, and is controlled by a program in LabVIEW 2012. Before attaching a sample bottle to the SDS, the volumetric pipette is cleared of any residual solution. The pipette is then rinsed and filled with the sample. The sample overflows and time is allowed for the sample temperature to equilibrate. The sample bottle temperature is measured using a DirecTemp thermistor probe inserted into the sample bottle and the volumetric pipette temperature is measured using a DirecTemp surface probe placed directly on the pipette. These temperature measurements, along with the bottle salinity, are used to convert the sample volume to mass for analysis. Samples are delivered into a 250-mL water-jacketed open cell for titration analysis. While one sample is undergoing titration, a second sample is prepared with the SDS and equilibrated to 20°C for analysis. Open-Cell Titration: The total alkalinity is measured through an open-cell titration with a dilute hydrochloric acid titrant of known concentration. A Metrohm 876 Dosimat Plus is used for all standardized hydrochloric acid additions. Alkalinity samples are drawn using silicone tubing connected to the niskin bottle and collected into 250 mL Pyrex bottles. The sample bottles and Teflon-sleeved glass stoppers were rinsed at least twice before the final filling. A headspace of approximately 3 mL was removed and 0.125 mL of 100% saturated mercuric chloride solution was added to each sample for preservation. The samples were equilibrated prior to analysis at approximately 20°C using a Thermo Scientific Isotemp water bath. Samples for total alkalinity were taken at all stations where a core cast was completed. Alkalinity samples were collected from each niskin where DIC and pH were collected, to completely characterize the CO2 system. The sampling scheme followed the Dissolved Inorganic Carbon (DIC) team, taking full (36 niksins) or partial (24 niskins) based on machine capacity. To evaluate the reproducibility of the alkalinity system, 2 duplicate samples (two separate alkalinity bottles) were collected on each cast, except for casts with fewer than 18 bottles, in which 1 duplicate sample was collected.; Standardization description: The samples were standardized using Certified Reference Materials (CRMs) provided by Dr. A. Dickson of Scripps Institution of Oceanography.; Standardization frequency: Daily; CRM manufacturer: Certified Reference Material (Dr. Andrew Dickson, Marine Physical Laboratory, La Jolla, California); CRM batch number: • Batch 213: 2204.10 ± 1.34 μmol/kg (188; 101); Preservation method: Mercuric chloride; Preservative volume: 200 μL; Uncertainty: Duplicate Standard Deviation ± 2.10 μmol kg-1 (111) [± std. dev.; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Method reference: Dickson 2007; Researcher name: Andrew Dickson; Researcher institution: SIO Parameter or Variable: pH on total scale; Abbreviation: PH_TOT; Observation type: discrete, bottle; Sampling instrument: Niskin Bottles; Analyzing instrument: Agilent 8453 spectrophotometer; Detailed sampling and analyzing information: pHT was measured spectrophotometrically on the total hydrogen scale using an Agilent 8453 spectrophotometer and in accordance with the methods outlined by Carter et al, 2013. [Carter2013]. A Kloehn V6 syringe pump was used to autonomously fill, mix, and dispense sample through the custom 10cm flow-through jacketed cell. A VWR recirculating water bath was used to maintain the cell temperature at 25.0°C during analyses, and a YSI 4600 precision thermometer and probe were used to monitor and record the temperature of each sample during the spectrophotometric measurements. Purified meta-cresol purple (mCP) was the dye indicator used to measure the absorbance of light measured at two different wavelengths (434 nm, 578 nm) corresponding to the maximum absorbance peaks for the acidic and basic forms of the indicator dye. A baseline absorbance was also measured and subtracted from these wavelengths. The baseline absorbance was determined by averaging the absorbances from 725-735nm. The ratio of the absorbances was then used to calculate pH on the total scale using the equations outlined in Liu et al., 2011. The salinity data used was obtained from the salinity analysis conducted on board. Sampleswere collected in 250 mL Pyrex glass bottles and sealed using butyl rubber stoppers held in place by aluminumcrimped caps. Each bottle was rinsed two times and allowed to overflow by one half additional bottle volume. Prior to sealing, each sample was given a 1% headspace and 0.125 mL of oversaturated mercuric chloride solution was added to each sample for preservation. Samples were collected only from niskin bottles that were also being sampled for both total alkalinity and dissolved inorganic carbon to completely characterize the carbon system. Additionally, duplicate samples were collected from all stations for quality control purposes. The sampling scheme followed the Dissolved Inorganic Carbon (DIC) team, taking full (36 niksins) or partial (24 niskins) based on machine capacity. The precision of the data was assessed from measurements of duplicate analyses and certified reference material (CRM) Batch 213 (provided by Dr. Andrew Dickson, UCSD). To evaluate the reproducibility of the pH system, two duplicate samples (two samples from one niskin bottle) were collected on each cast, except for casts with fewer than 20 niskins, in which one duplicate sample was collected. CRMs were measured at the beginning and ending of each day. The precision statistics for I08S are: Duplicate precision ± 0.0006 (n = 122 pairs) CRM Batch 213 7.8350 ± 0.0012 (n = 57) 1767 pH values were submitted for I08S. Additional corrections will need to be performed and these data should be considered preliminary until a more thorough analysis of the data can take place on shore.; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Andrew Dickson; Researcher institution: SIO Parameter or Variable: Dissolved Organic Carbon; Abbreviation: DOC; Unit: UMOL/KG; Observation type: CTD Niskin Bottles; Sampling instrument: CTD Niskin Bottles; Analyzing instrument: DOC samples will be analyzed via high temperature combustion using a Shimadzu TOC-V or Shimadzu TOC-L at an inshore based laboratory at UCSB.; Detailed sampling and analyzing information: The goal of the DOM project is to provide high resolution, long term monitoring of DOC/TDN distribution throughout the water column, in order to help better understand biogeochemical cycling in global oceans. For 2024 the Carlson Lab at UCSB will evaluate dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) concentrations along the US GO-SHIP IO8S transect. Over the course of the IO8S cruise, DOC/TDN was sampled at every other station in conjunction with DIC, Alkalinity, and pH. For these, DOM was sampled from up to 36 unique Niskins ranging the full depth of the water column, with two duplicates randomly selected for a total of 38 samples collected per these casts. In addition, at intermediate stations where DOM was not collected for the full depth profile, a single surface sample was collected (in replicate) to increase surface resolution across this section. DOM was sampled at 33 stations for full depth profiles, and an additional 33 surface sample-only stations were also collected. In total 1,243 individual DOC samples were collected.; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Craig Carlson (UCSB); Researcher institution: UCSB Parameter or Variable: CTD Temperature; Abbreviation: CTDTMP; Unit: degrees celcius; Observation type: CTD sensor; Sampling instrument: CTD; Analyzing instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Todd Martz; Researcher institution: SIO Parameter or Variable: CTD Salinity; Abbreviation: CTDSAL; Observation type: CTD sensor; Sampling instrument: CTD; Analyzing instrument: CTD; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Todd Martz; Researcher institution: SIO Parameter or Variable: Nutrients; Abbreviation: SILCAT, NITRAT, NITRIT, PHSPHT; Unit: UMOL/KG; Observation type: Bottle, discrete; Sampling instrument: CTD Niskin Bottles; Analyzing instrument: Discrete samples were run on a continuous flow analyzer.; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Susan Becker; Researcher institution: SIO Parameter or Variable: Dissolved Oxygen; Abbreviation: OXYGEN; Unit: UMOL/KG; Observation type: Bottle, discrete; Sampling instrument: CTD Niskin Bottles; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher name: Susan Becker, Jim Swift; Researcher institution: SIO Parameter or Variable: Chlorofluorocarbons; Abbreviation: CFC11, CFC12, CFC113; Unit: PMOL/KG; Observation type: Bottle, discrete; Sampling instrument: CTD Niskin Bottles; Quality flag convention: WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value; Researcher institution: UW asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian 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. CTD CTD Conductivity-Temperature-Depth probe Niskin bottle Niskin bottle Device for obtaining samples of seawater at a specific depth Why special entry for Niskin bottle but no entry for Nansen bottle? nutrient autoanalyzer nutrient autoanalyzer Laboratory Instrument Nutrient Autoanalyzer is a generic term describing an automated flow-thru system used to conduct analyses of several different nutrients (nitrate, ammonium, orthophosphate, and silicate) simultaneously from a seawater sample. For example: SEAL AutoAnalyzer 3 HR Continuous Segmented Flow Analyzer oxygen sensor oxygen sensor Any instrument that measures oxygen content in a compound. pH sensor pH sensor generic meter used to measure pH Any of a class of instruments used to quantify pH in a water or other type of sample. salinometer salinometer generic salinometer use salinometer when the instrument type used is unclear but the data include salinity measurements temperature sensor temperature sensor A sensor used to measure temperature. titrator titrator titrator R/V THOMAS G. THOMPSON Use this platform for data attributed to R/V Thomas G. Thompson that were collected between July 1991 and present. R/V Thomas G. Thompson (AGOR-23) Owned by US Navy, leased to University of Washington. Active dates: July 1991 (Source: http://www.navsource.org/archives/09/57/5723.htm, last accessed on 20 Dec 2011)