Return to search results

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 | Metadata Last Checked: January 29, 2026 | Last Modified: 2025-09-09T00:00:00.000+00:00

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.

Find Related Datasets

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", "description": "Navigate directly to the URL for a descriptive web page with download links.", "describedByType": "application/octet-steam" }, { "@type": "dcat:Distribution", "title": "NCEI Dataset Landing Page", "mediaType": "placeholder/value", "description": "Navigate directly to the URL for a descriptive web page with download links.", "downloadURL": "https://doi.org/10.25921/7as7-et15", "describedByType": "application/octet-steam" }, { "@type": "dcat:Distribution", "title": "Descriptive Information", "mediaType": "placeholder/value", "description": "Navigate directly to the URL for a descriptive web page with download links.", "downloadURL": "https://www.ncei.noaa.gov/archive/accession/oas/307789", "describedByType": "application/octet-steam" }, { "@type": "dcat:Distribution", "title": "HTTPS", "mediaType": "placeholder/value", "description": "Navigate directly to the URL for data access and direct download.", "downloadURL": "https://www.ncei.noaa.gov/archive/accession/download/307789", "describedByType": "application/octet-steam" }, { "@type": "dcat:Distribution", "title": "FTP", "mediaType": "placeholder/value", "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).", "downloadURL": "ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0239/0307789/", "describedByType": "application/octet-steam" }, { "@type": "dcat:Distribution", "title": "https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system", "mediaType": "placeholder/value", "description": "OCADS website", "downloadURL": "https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system", "describedByType": "application/octet-steam" }, { "@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", "description": "Related data", "describedByType": "application/octet-steam" }, { "@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", "description": "Related data", "describedByType": "application/octet-steam" }, { "@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", "description": "Related data", "describedByType": "application/octet-steam" }, { "@type": "dcat:Distribution", "title": "https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/", "mediaType": "placeholder/value", "description": "related resource", "downloadURL": "https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/", "describedByType": "application/octet-steam" }, { "@type": "dcat:Distribution", "title": "GCMD Keyword Forum Page", "mediaType": "placeholder/value", "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", "downloadURL": "https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords", "describedByType": "application/octet-steam" }, { "@type": "dcat:Distribution", "title": "NCEI Contact Information", "mediaType": "placeholder/value", "description": "Information for contacts at NCEI.", "downloadURL": "https://www.ncei.noaa.gov/contact", "describedByType": "application/octet-steam" } ]
identifier	gov.noaa.nodc:0307789
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)