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.

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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" ]
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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)