gov.noaa.nodc:0307789 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 2026-03-26T08:50:27Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Long-term changes of surface total alkalinity and its driving mechanisms in the Northern Indian Ocean from 1993-01-01 to 2020-12-31 (NCEI Accession 0307789) 2025-09-09 publication 2025-09-08 creation International DOI Foundation (IDF) 10.25921/7as7-et15 NOAA National Centers for Environmental Information gov.noaa.nodc:0307789 NCEI Archive Management System 0307789 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 Kunal Chakraborty Indian National Centre for Ocean Information Services (INCOIS) kunal.c@incois.gov.in http://www.incois.gov.in/Incois/incois1024/index/index.jsp HTTP Indian National Centre for Ocean Information Services (INCOIS) website Institution web page information resourceProvider Indian National Centre for Ocean Information Services (INCOIS) http://www.incois.gov.in/Incois/incois1024/index/index.jsp HTTP Indian National Centre for Ocean Information Services (INCOIS) website Institution web page information resourceProvider Apurva P. Joshi MoES-Indian National Centre for Ocean Information Services (INCOIS) principalInvestigator Prasanna Kanti Ghoshal MoES-Indian National Centre for Ocean Information Services (INCOIS) principalInvestigator Kunal Chakraborty MoES-Indian National Centre for Ocean Information Services (INCOIS) kunal.c@incois.gov.in principalInvestigator Rajdeep Roy Regional Remote Sensing Centre‐East, National Remote Sensing Centre principalInvestigator Chiranjivi Jayaram Regional Remote Sensing Centre‐East, National Remote Sensing Centre principalInvestigator Bobbili Sridevi MoES-Indian National Centre for Ocean Information Services (INCOIS) principalInvestigator Vedula V. S. S. Sarma CSIR‐National Institute of Oceanography principalInvestigator Joshi, Apurva P. MoES-Indian National Centre for Ocean Information Services (INCOIS) author Ghoshal, Prasanna Kanti MoES-Indian National Centre for Ocean Information Services (INCOIS) author Chakraborty, Kunal MoES-Indian National Centre for Ocean Information Services (INCOIS) author Roy, Rajdeep Regional Remote Sensing Centre‐East, National Remote Sensing Centre author Jayaram, Chiranjivi Regional Remote Sensing Centre‐East, National Remote Sensing Centre author Sridevi, Bobbili MoES-Indian National Centre for Ocean Information Services (INCOIS) author Sarma, Vedula V. S. S. CSIR‐National Institute of Oceanography author Indian National Centre for Ocean Information Services (INCOIS) http://www.incois.gov.in/Incois/incois1024/index/index.jsp HTTP Indian National Centre for Ocean Information Services (INCOIS) website Institution web page information contributor National Institute of Oceanography - India (NIO) contributor Unknown - India contributor tableDigital This product is a result of the use of a decision tree-based advanced machine learning algorithm (XGB) combined with an ensemble approach to predict the surface total alkalinity (TA) of the North Indian Ocean (NIO) (Longitude: 50E-100E, Latitude: 0-26N) using ship-based observations collected from different sources for the period 1978-2019 and a reanalysis data product. The ensemble approach enables the development of the best high-resolution (1/12°) surface TA estimates (INCOIS_TA) with an uncertainty map. This data has a monthly frequency and ranges from 1993 to 2020. This dataset is available to the public for a wide variety of uses including scientific research and analysis. Funding Information: MoES-Indian National Centre for Ocean Information Services (INCOIS) 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:0307789 Preview graphic PNG 0307789 NCEI ACCESSION NUMBER 2025-08-28 publication total alkalinity theme NODC DATA TYPES THESAURUS Niskin bottle titrator instrument NODC INSTRUMENT TYPES THESAURUS chemical model output theme NODC OBSERVATION TYPES THESAURUS Indian National Centre for Ocean Information Services National Institute of Oceanography - India Unknown - India dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS Indian National Centre for Ocean Information Services dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS Ocean Carbon and Acidification Data System (OCADS) project NODC PROJECT NAMES THESAURUS Arabian Sea Bay of Bengal Indian Ocean place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication IN/NIO > National Institute of Oceanography, India 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 Ocean Carbon and Acidification Data System (OCADS) Project project Ocean Acidification Search Keywords EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY 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 Model output theme OCADS Study Type INCOIS_TA TA_uncertainty theme Provider Variable Abbreviations NISKIN BOTTLES 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 OCEAN > INDIAN OCEAN OCEAN > INDIAN OCEAN > ARABIAN SEA OCEAN > INDIAN OCEAN > BAY OF BENGAL 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 place Provider Geographic Names accessLevel: public otherRestrictions Cite as: Joshi, Apurva P.; Ghoshal, Prasanna Kanti; Chakraborty, Kunal; Roy, Rajdeep; Jayaram, Chiranjivi; Sridevi, Bobbili; Sarma, Vedula V. S. S. (2025). Long-term changes of surface total alkalinity and its driving mechanisms in the Northern Indian Ocean from 1993-01-01 to 2020-12-31 (NCEI Accession 0307789). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/7as7-et15. 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 This dataset is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License. SPDX License: Creative Commons Attribution 4.0 International (CC-BY-4.0) 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 Joshi, Apurva P.; Ghoshal, Prasanna Kanti; Chakraborty, Kunal; Sarma, Vedula V. S. S. (2025). Sea-surface pCO2 maps for the Bay of Bengal based on advanced machine learning algorithms from 2015-01-01 to 2015-12-31 (NCEI Accession 0307627). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/2sjr-pg16. 2025-09-08 publication International DOI Foundation (IDF) https://doi.org/10.25921/2sjr-pg16 NOAA National Centers for Environmental Information gov.noaa.nodc:0307627 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307627.html HTTPS https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307627.html Related dataset information Joshi, Apurva P. MoES-Indian National Centre for Ocean Information Services (INCOIS) author Ghoshal, Prasanna Kanti MoES-Indian National Centre for Ocean Information Services (INCOIS) author Chakraborty, Kunal MoES-Indian National Centre for Ocean Information Services (INCOIS) author Sarma, Vedula V. S. S. CSIR-National Institute of Oceanography author NOAA National Centers for Environmental Information (NCEI) publisher tableDigital crossReference project Chakraborty, Kunal; Joshi, Apurva P.; Ghoshal, Prasanna Kanti; Baduru, Balaji; Valsala, Vinu; Sarma, Vedula V. S. S.; Metzl, Nicolas; Gehlen, Marion; Chevallier, Frédéric; Lo Monaco, Claire (2025). Indian ocean acidification and its driving mechanisms over the last four decades from 1980-01-01 to 2019-12-31 (NCEI Accession 0307663). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/z2x4-vt48. 2025-09-08 publication International DOI Foundation (IDF) https://doi.org/10.25921/z2x4-vt48 NOAA National Centers for Environmental Information gov.noaa.nodc:0307663 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307663.html HTTPS https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307663.html Related dataset information Chakraborty, Kunal MoES-Indian National Centre for Ocean Information Services (INCOIS) author Joshi, Apurva P. MoES-Indian National Centre for Ocean Information Services (INCOIS) author Ghoshal, Prasanna Kanti MoES-Indian National Centre for Ocean Information Services (INCOIS) author Baduru, Balaji Indian National Centre for Ocean Information Services (INCOIS); Indian Institute of Tropical Meteorology, Ministry of Earth Sciences author Valsala, Vinu Indian Institute of Tropical Meteorology, Ministry of Earth Sciences author Sarma, Vedula V. S. S. CSIR-National Institute of Oceanography author Metzl, Nicolas Laboratoire LOCEAN/IPSL, Sorbonne Université author Gehlen, Marion Laboratoire des Sciences du Climat et de l’Environnement, LSCE‐IPSL, CEA‐CNRS‐UVSQ, Université Paris‐Saclay author Chevallier, Frédéric Laboratoire des Sciences du Climat et de l’Environnement, LSCE‐IPSL, CEA‐CNRS‐UVSQ, Université Paris‐Saclay author Lo Monaco, Claire Laboratoire LOCEAN/IPSL, Sorbonne Université author NOAA National Centers for Environmental Information (NCEI) publisher tableDigital crossReference project Ghoshal, Prasanna Kanti; Joshi, Apurva P.; Chakraborty, Kunal (2025). An improved long-term high-resolution surface pCO2 data product for the Indian Ocean using machine learning from 1980-01-01 to 2020-12-31 (NCEI Accession 0307788). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/r2q9-d197. 2025-09-09 publication International DOI Foundation (IDF) https://doi.org/10.25921/r2q9-d197 NOAA National Centers for Environmental Information gov.noaa.nodc:0307788 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307788.html HTTPS https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307788.html Related dataset information Ghoshal, Prasanna Kanti MoES-Indian National Centre for Ocean Information Services (INCOIS) author Joshi, Apurva P. MoES-Indian National Centre for Ocean Information Services (INCOIS) author Chakraborty, Kunal MoES-Indian National Centre for Ocean Information Services (INCOIS) author NOAA National Centers for Environmental Information (NCEI) publisher tableDigital crossReference project Global Ocean Carbon Data 2022 publication https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/ HTTPS https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/ Related resource information NOAA National Centers for Environmental Information (NCEI) publisher documentDigital crossReference project eng; USA utf8 environment oceans 50 100 0 26 1993-01-01 2020-12-31 This data package (Submission ID: BJGDVR7A2) was acquired by NCEI from the Scientific Data Integration System (SDIS) at the NOAA Pacific Marine Environmental Laboratory (PMEL) in accordance with the archival submission agreement between NCEI and PMEL. 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 744.964 https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307789.html HTTPS Web browser Project Metadata Navigate directly to the URL for a descriptive web page with download links. information https://doi.org/10.25921/7as7-et15 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/307789 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/307789 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0239/0307789/ 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 0307789 v1.1 was published. 2025-09-09T20:57:19Z NCEI Accession 0307789 v1.1 publication https://www.ncei.noaa.gov/archive/accession/0307789/1.1 HTTPS NCEI Accession 0307789 v1.1 published 2025-09-09T20:57:19Z download dataset Parameter or Variable: Total Alkalinity; Abbreviation: INCOIS_TA; Unit: μmol/kg; Observation type: Model output Parameter or Variable: Uncertainty in Total Alkalinity; Abbreviation: TA_uncertainty; Unit: μmol/kg; Observation type: Model output asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian 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? titrator titrator titrator