Skip to main content
U.S. flag

An official website of the United States government

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)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: May 29, 2026 at 08:38 PM | Dataset Last Updated: September 09, 2025 at 12:00 AM
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.

Resources

12 resources available

  • Project Metadata

    TEXT/HTML
    Visit Page

  • NCEI Dataset Landing Page

    TEXT/HTML
    Visit Page

  • Descriptive Information

    TEXT/HTML
    Visit Page

  • HTTPS

    TEXT/HTML
    Visit Page

  • FTP

    TEXT/HTML
    Visit Page

  • https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system

    TEXT/HTML
    Visit Page

  • https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307627.html

    TEXT/HTML
    Visit Page

  • https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307663.html

    TEXT/HTML
    Visit Page

  • https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307788.html

    TEXT/HTML
    Visit Page

  • https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/

    TEXT/HTML
    Visit Page

  • GCMD Keyword Forum Page

    TEXT/HTML
    Visit Page

  • NCEI Contact Information

    TEXT/HTML
    Visit Page

Find Related Datasets

Search by Tags

Click any tag below to search for similar datasets

Complete Metadata
@type dcat:Dataset
accessLevel non-public
contactPoint 
                                            {
  "fn": "NOAA National Centers for Environmental Information",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:ncei.info@noaa.gov"
}
describedByType application/octet-steam
description 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.
distribution 
                                            [
  {
    "@type": "dcat:Distribution",
    "title": "Project Metadata",
    "accessURL": "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307789.html",
    "mediaType": "text/html",
    "description": "Navigate directly to the URL for a descriptive web page with download links.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "NCEI Dataset Landing Page",
    "accessURL": "https://doi.org/10.25921/7as7-et15",
    "mediaType": "text/html",
    "description": "Navigate directly to the URL for a descriptive web page with download links.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Descriptive Information",
    "accessURL": "https://www.ncei.noaa.gov/archive/accession/oas/307789",
    "mediaType": "text/html",
    "description": "Navigate directly to the URL for a descriptive web page with download links.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "HTTPS",
    "accessURL": "https://www.ncei.noaa.gov/archive/accession/download/307789",
    "mediaType": "text/html",
    "description": "Navigate directly to the URL for data access and direct download.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "FTP",
    "accessURL": "ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0239/0307789/",
    "mediaType": "text/html",
    "description": "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).",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system",
    "accessURL": "https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system",
    "mediaType": "text/html",
    "description": "OCADS website",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307627.html",
    "accessURL": "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307627.html",
    "mediaType": "text/html",
    "description": "Related dataset",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307663.html",
    "accessURL": "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307663.html",
    "mediaType": "text/html",
    "description": "Related dataset",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307788.html",
    "accessURL": "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307788.html",
    "mediaType": "text/html",
    "description": "Related dataset",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/",
    "accessURL": "https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/",
    "mediaType": "text/html",
    "description": "Related resource",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "GCMD Keyword Forum Page",
    "accessURL": "https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords",
    "mediaType": "text/html",
    "description": "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",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "NCEI Contact Information",
    "accessURL": "https://www.ncei.noaa.gov/contact",
    "mediaType": "text/html",
    "description": "Information for contacts at NCEI.",
    "describedByType": "application/octet-stream"
  }
]
identifier https://data.noaa.gov/waf/NOAA/NESDIS/ncei/accessions/iso/xml/0307789.xml
issued 2025-09-08T00:00:00.000+00:00
keyword 
                                            [
  "0307789",
  "total alkalinity",
  "Niskin bottle",
  "titrator",
  "chemical",
  "model output",
  "Indian National Centre for Ocean Information Services",
  "National Institute of Oceanography - India",
  "Unknown - India",
  "Indian National Centre for Ocean Information Services",
  "Ocean Carbon and Acidification Data System (OCADS)",
  "Arabian Sea",
  "Bay of Bengal",
  "Indian Ocean",
  "oceanography",
  "IN/NIO > National Institute of Oceanography, India",
  "Ocean Carbon and Acidification Data System (OCADS) Project",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY",
  "Model output",
  "INCOIS_TA",
  "TA_uncertainty",
  "NISKIN BOTTLES",
  "OCEAN > INDIAN OCEAN",
  "OCEAN > INDIAN OCEAN > ARABIAN SEA",
  "OCEAN > INDIAN OCEAN > BAY OF BENGAL",
  "Indian Ocean"
]
landingPage https://www.ncei.noaa.gov/contact
language 
                                            []
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2025-09-09T00:00:00.000+00:00
publisher 
                                            {
  "name": "NOAA National Centers for Environmental Information",
  "@type": "org:Organization"
}
references 
                                            [
  "https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system",
  "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307627.html",
  "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307663.html",
  "https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0307788.html",
  "https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/"
]
rights otherRestrictions
spatial 100.0,0.0,50.0,26.0
temporal 1993-01-01T00:00:00+00:00/2020-12-31T00:00:00+00:00
title 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)

data.gov

An official website of the GSA's Technology Transformation Services

Looking for U.S. government information and services?
Visit USA.gov