gov.noaa.nodc:0222470 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 2026-07-27T07:12:31Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) A global monthly climatology of total alkalinity (AT): a neural network approach (NCEI Accession 0222470) 2020-12-01 publication 2020-11-30 creation International DOI Foundation (IDF) 10.25921/5p69-y471 NOAA National Centers for Environmental Information gov.noaa.nodc:0222470 NCEI Archive Management System 0222470 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 Daniel Broullón Instituto de Investigacións Mariñas de Vigo (IIM) dbroullon@iim.csic.es https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information resourceProvider Instituto de Investigacións Mariñas de Vigo (IIM) https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information resourceProvider Daniel Broullón Instituto de Investigacións Mariñas de Vigo (IIM) dbroullon@iim.csic.es https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information principalInvestigator Fiz Fernandez Perez Spanish National Research Council (CSIC) fiz.perez@iim.csic.es https://www.iim.csic.es/ HTTPS Spanish National Research Council (CSIC) website Institution web page information principalInvestigator Antón Velo Instituto de Investigacións Mariñas de Vigo (IIM) https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information principalInvestigator Mario Hoppema Alfred Wegener Institute for Polar and Marine Research (AWI) Mario.Hoppema@awi.de principalInvestigator Are Olsen Bjerknes Centre for Climate Research Are.Olsen@gfi.uib.no https://bjerknes.uib.no/ HTTPS Bjerknes Centre for Climate Research website Institution web page information principalInvestigator Taro Takahashi Lamont-Doherty Earth Observatory (LDEO) http://www.ldeo.columbia.edu/ HTTP Lamont-Doherty Earth Observatory (LDEO) website Institution web page information principalInvestigator Robert M. Key Princeton University key@princeton.edu http://www.princeton.edu HTTP Princeton University website Institution web page information principalInvestigator Toste Tanhua GEOMAR Helmholtz Centre for Ocean Research Kiel (GEOMAR) ttanhua@ifm-geomar.de http://www.geomar.de/ HTTP GEOMAR Helmholtz Centre for Ocean Research Kiel (GEOMAR) website Institution web page information principalInvestigator MELCHOR GONZALEZ-DAVILA Instituto de Oceanografía y Cambio Global, IOCAG melchor.gonzalez@ulpgc.es principalInvestigator Emil Jeansson Bjerknes Centre for Climate Research emje@norceresearch.no https://bjerknes.uib.no/ HTTPS Bjerknes Centre for Climate Research website Institution web page information principalInvestigator Alex Kozyr Cooperative Institute for Satellite Earth System Studies (CISESS) Alex.Kozyr@noaa.gov https://cisess.umd.edu/ HTTPS Cooperative Institute for Satellite Earth System Studies (CISESS) website Institution web page information principalInvestigator Steven van Heuven University of Groningen (RUG) svheuven@gmail.com https://www.rug.nl/ HTTPS University of Groningen (RUG) website Institution web page information principalInvestigator Broullón, Daniel Instituto de Investigacións Mariñas de Vigo dbroullon@iim.csic.es https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information author Pérez, Fiz F. Spanish National Research Council https://www.iim.csic.es/ HTTPS Spanish National Research Council (CSIC) website Institution web page information author Velo, Antón Instituto de Investigacións Mariñas de Vigo https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information author Hoppema, Mario Alfred Wegener Institute for Polar and Marine Research (AWI) author Olsen, Are Bjerknes Centre for Climate Research https://bjerknes.uib.no/ HTTPS Bjerknes Centre for Climate Research website Institution web page information author Takahashi, Taro Lamont-Doherty Earth Observatory http://www.ldeo.columbia.edu/ HTTP Lamont-Doherty Earth Observatory (LDEO) website Institution web page information author Key, Robert M. Princeton University key@princeton.edu http://www.princeton.edu HTTP Princeton University website Institution web page information author Tanhua, Toste GEOMAR Helmholtz Centre for Ocean Research Kiel http://www.geomar.de/ HTTP GEOMAR Helmholtz Centre for Ocean Research Kiel (GEOMAR) website Institution web page information author González-Dávila, Melchor Instituto de Oceanografía y Cambio Global, IOCAG author Jeansson, Emil Bjerknes Centre for Climate Research https://bjerknes.uib.no/ HTTPS Bjerknes Centre for Climate Research website Institution web page information author Kozyr, Alex Cooperative Institute for Satellite Earth System Studies https://cisess.umd.edu/ HTTPS Cooperative Institute for Satellite Earth System Studies (CISESS) website Institution web page information author van Heuven, Steven M. A. C. University of Groningen https://www.rug.nl/ HTTPS University of Groningen (RUG) website Institution web page information author Instituto de Investigacións Mariñas de Vigo (IIM) https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information contributor tableDigital This dataset contains global monthly climatology of oceanic total alkalinity (AT). Total alkalinity (AT) monthly climatology was created from a neural network approach (Broullón et al., 2019). The neural network was trained with GLODAPv2.2019 data (Olsen et al., 2019) using as predictor variables position (latitude, longitude and depth), temperature, salinity, phosphate, nitrate, silicate and dissolved oxygen. The relations extracted between these predictor variables and AT were used to obtain the climatology passing through the network global monthly climatologies of the predictor variables: temperature and salinity fields of the World Ocean Atlas version 2013 (WOA13), filtered WOA13 oxygen (fifth-order one-dimensional median filter through the depth dimension; see Broullón et al., 2019 for details) and nutrients computed using CANYON-B (Bittig et al., 2018) over the three previous fields. The obtained climatology has a 1°x1° spatial resolution and 102 depth levels between 0 and 5500 m, with a monthly resolution from 0 to 1500 m and an annual resolution from 1550 to 5500m. This dataset is available to the public for a wide variety of uses including scientific research and analysis. Funding Information: European Community ()) 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:0222470 Preview graphic PNG 0222470 NCEI ACCESSION NUMBER 2020-11-20 publication DEPTH - OBSERVATION DISSOLVED OXYGEN LATITUDE LONGITUDE NITRATE phosphate silicate total alkalinity theme NODC DATA TYPES THESAURUS nutrient autoanalyzer oxygen sensor titrator instrument NODC INSTRUMENT TYPES THESAURUS chemical discrete sample physical profile theme NODC OBSERVATION TYPES THESAURUS VARIOUS CHARTERED VESSELS platform NODC PLATFORM NAMES THESAURUS Instituto de Investigacións Mariñas de Vigo dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS Instituto de Investigacións Mariñas de Vigo dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS GLOBAL OCEAN DATA ANALYSIS PROJECT (GLODAP) project NODC PROJECT NAMES THESAURUS Indian Ocean North Atlantic Ocean North Pacific Ocean South Atlantic Ocean South Pacific Ocean Southern Ocean place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication Various project Cruise ID GLODAP > Global Ocean Data Analysis Project project Global Change Master Directory (GCMD) Project Keywords 2026 revision 24 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 EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 24 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 Data synthesis product theme OCADS Study Type AT_NNGv2 depth latitude longitude nitrate oxygen phosphate silicate theme Provider Variable Abbreviations AUTOANALYZER > AUTOANALYZER OXYGEN METERS > OXYGEN METERS instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 24 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 > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN OCEAN > ATLANTIC OCEAN > SOUTH ATLANTIC OCEAN OCEAN > INDIAN OCEAN OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN OCEAN > SOUTHERN OCEAN place Global Change Master Directory (GCMD) Location Keywords 2026 revision 24 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 Arctic Ocean Atlantic Ocean Indian Ocean Pacific Ocean Southern Ocean place Provider Geographic Names accessLevel: public otherRestrictions Cite as: Broullón, Daniel; Pérez, Fiz F.; Velo, Antón; Hoppema, Mario; Olsen, Are; Takahashi, Taro; Key, Robert M.; Tanhua, Toste; González-Dávila, Melchor; Jeansson, Emil; Kozyr, Alex; van Heuven, Steven M. A. C. (2020). A global monthly climatology of total alkalinity (AT): a neural network approach (NCEI Accession 0222470). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/5p69-y471. 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. Broullón, D., Pérez, F. F., Velo, A., Hoppema, M., Olsen, A., Takahashi, T., Key, R. M., Tanhua, T., González-Dávila, M., Jeansson, E., Kozyr, A., & van Heuven, S. M. A. C. (2019). A global monthly climatology of total alkalinity: a neural network approach. Earth System Science Data, 11(3), 1109–1127. https://doi.org/10.5194/essd-11-1109-2019 2019-07-31 publication International DOI Foundation (IDF) https://doi.org/10.5194/essd-11-1109-2019 https://doi.org/10.5194/essd-11-1109-2019 HTTPS https://doi.org/10.5194/essd-11-1109-2019 journal article information Broullón, Daniel author Pérez, Fiz F. Instituto de Investigaciones Marinas de Vigo https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information author Velo, Antón IIM-CSIC https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information author Hoppema, Mario Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research https://www.awi.de/ HTTPS Alfred-Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) website Institution web page information author Olsen, Are University of Bergen author Takahashi, Taro author Key, Robert M. author Tanhua, Toste author González-Dávila, Melchor author Jeansson, Emil author Kozyr, Alex author van Heuven, Steven M. A. C. Alfred-Wegener-Institut für Polar und Meeresforschung https://www.awi.de/ HTTPS Alfred-Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) website Institution web page information author Copernicus GmbH publisher documentDigital Earth Syst. Sci. Data 11(3) ISSN 1866-3516, pp. 1109-1127 crossReference project Bittig, H. C., Steinhoff, T., Claustre, H., Fiedler, B., Williams, N. L., Sauzède, R., Körtzinger, A., & Gattuso, J.-P. (2018). An Alternative to Static Climatologies: Robust Estimation of Open Ocean CO2 Variables and Nutrient Concentrations From T, S, and O2 Data Using Bayesian Neural Networks. Frontiers in Marine Science, 5. https://doi.org/10.3389/fmars.2018.00328 2018-09-20 publication International DOI Foundation (IDF) https://doi.org/10.3389/fmars.2018.00328 https://doi.org/10.3389/fmars.2018.00328 HTTPS https://doi.org/10.3389/fmars.2018.00328 journal article information Bittig, Henry C. author Steinhoff, Tobias author Claustre, Hervé author Fiedler, Björn author Williams, Nancy L. author Sauzède, Raphaëlle author Körtzinger, Arne author Gattuso, Jean-Pierre author Frontiers Media SA publisher documentDigital Front. Mar. Sci. 5 ISSN 2296-7745 crossReference project Olsen, A., Lange, N., Key, R. M., Tanhua, T., Álvarez, M., Becker, S., Bittig, H. C., Carter, B. R., Cotrim da Cunha, L., Feely, R. A., van Heuven, S., Hoppema, M., Ishii, M., Jeansson, E., Jones, S. D., Jutterström, S., Karlsen, M. K., Kozyr, A., Lauvset, S. K., … Wanninkhof, R. (2019). GLODAPv2.2019 – an update of GLODAPv2. Earth System Science Data, 11(3), 1437–1461. https://doi.org/10.5194/essd-11-1437-2019 2019-09-25 publication International DOI Foundation (IDF) https://doi.org/10.5194/essd-11-1437-2019 https://doi.org/10.5194/essd-11-1437-2019 HTTPS https://doi.org/10.5194/essd-11-1437-2019 journal article information Olsen, Are University of Bergen author Lange, Nico author Key, Robert M. author Tanhua, Toste GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel http://www.geomar.de/ HTTP GEOMAR Helmholtz Centre for Ocean Research Kiel (GEOMAR) website Institution web page information author Álvarez, Marta Oceanographic Center of A Coruña author Becker, Susan author Bittig, Henry C. author Carter, Brendan R. CICOES author Cotrim da Cunha, Leticia Universidade do Estado do Rio de Janeiro author Feely, Richard A. author van Heuven, Steven Alfred-Wegener-Institut für Polar und Meeresforschung https://www.awi.de/ HTTPS Alfred-Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) website Institution web page information author Hoppema, Mario Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research https://www.awi.de/ HTTPS Alfred-Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) website Institution web page information author Ishii, Masao author Jeansson, Emil NORCE author Jones, Steve D. VLIZ author Jutterström, Sara author Karlsen, Maren K. author Kozyr, Alex author Lauvset, Siv K. author Lo Monaco, Claire author Murata, Akihiko author Pérez, Fiz F. Instituto de Investigaciones Marinas de Vigo https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information author Pfeil, Benjamin author Schirnick, Carsten GEOMAR Helmholtz Centre for Ocean Research Kiel http://www.geomar.de/ HTTP GEOMAR Helmholtz Centre for Ocean Research Kiel (GEOMAR) website Institution web page information author Steinfeldt, Reiner University of Bremen https://www.uni-bremen.de/ HTTPS University of Bremen website Institution web page information author Suzuki, Toru author Telszewski, Maciej author Tilbrook, Bronte CSIRO author Velo, Anton IIM-CSIC https://www.iim.csic.es/ HTTPS Instituto de Investigacións Mariñas de Vigo (IIM) website Institution web page information author Wanninkhof, Rik author Copernicus GmbH publisher documentDigital Earth Syst. Sci. Data 11(3) ISSN 1866-3516, pp. 1437-1461 crossReference project NDP-106 2022 publication https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/ndp_106/ndp106.html HTTPS https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/ndp_106/ndp106.html 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 -179.5 179.5 -77.5 89.5 1957-01-01 2018-12-31 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 2950.36 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0222470.html HTTPS Web browser Project Metadata Navigate directly to the URL for a descriptive web page with download links. information https://doi.org/10.25921/5p69-y471 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/222470 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/222470 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0164/0222470/ 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 0222470 v1.1 was published. 2020-12-01T23:05:40Z NCEI Accession 0222470 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0222470/1.1 HTTPS NCEI Accession 0222470 v1.1 published 2020-12-01T23:05:40Z download dataset Parameter or Variable: latitude in degrees north (-77.5:89.5 with 1˚ resolution); Abbreviation: latitude; Unit: degrees_north Parameter or Variable: longitude in degrees east (-179.5:179.5 with 1˚ resolution); Abbreviation: longitude; Unit: degrees_east Parameter or Variable: depth in meters (0 - 5500m with 102 depth levels of WOA13); Abbreviation: depth; Unit: meters Parameter or Variable: AT in µmol kg-1 (dimensions: longitude, latitude, depth, time); Abbreviation: AT_NNGv2; Unit: µmol kg-1 Parameter or Variable: phosphate in µmol kg-1 (dimensions: longitude, latitude, depth, time); Abbreviation: phosphate; Unit: µmol kg-1 Parameter or Variable: nitrate in µmol kg-1 (dimensions: longitude, latitude, depth, time); Abbreviation: nitrate; Unit: µmol kg-1 Parameter or Variable: silicate in µmol kg-1 (dimensions: longitude, latitude, depth, time); Abbreviation: silicate; Unit: µmol kg-1 Parameter or Variable: dissolved oxygen in µmol kg-1 (dimensions: longitude, latitude, depth, time); Abbreviation: oxygen; Unit: µmol kg-1 asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian 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. titrator titrator titrator VARIOUS CHARTERED VESSELS VARIOUS CHARTERED VESSELS