Freshwater Sources in the Global Ocean through Salinity-d18O Relationships: A Machine Learning Solution to a Water Mass Problem

This dataset contains point estimates of meteoric water and sea-ice meltwater fractions in polar ocean water masses, together with estimates of the global stable oxygen isotopic composition (d18O) of meteoric water. The estimates were inferred from co-located d18O, salinity and temperature observations from NASA-GISS and CISE-LOCEAN datasets and individual cruise data available through the British Oceanographic Data Centre, using a Self Organizing Map machine-learning approach to identify distinct salinity-d18O relationships in water masses.

Simple

Date (Publication)
2025-10-15
Citation identifier
10.5281/zenodo.17357937
Purpose

To quantify freshwater-source fractions in ocean water masses and characterize salinity-d18O relationships using a machine-learning approach.
Credit

This dataset was produced within the OCEAN ICE project (Ocean-Cryosphere Exchanges in Antarctica: Impacts on Climate and the Earth System), funded by the European Union under Horizon Europe Grant Agreement No. 101060452.
Status
Completed
Originator
  NORCE Research AS
Originator
  NORCE Research AS
Originator
  National Oceanography Centre
Originator
  Woods Hole Oceanographic Institution
Originator
  British Antarctic Survey
Maintenance and update frequency
As needed
Keywords

  • Meteoric Water

  • Sea Ice Meltwater

  • Freshwater

  • Ocean

  • Oxygen Isotopes

  • salinity

  • Self Organizing Map

  • machine learning

  • OCEAN ICE
Keywords

Continents, countries, sea regions of the world.

  • Antarctica

  • Southern Ocean
GEMET - INSPIRE themes, version 1.0

Global Change Master Directory (GCMD) Keywords

  • OCEAN CURRENTS

  • OCEAN CIRCULATION

  • WATER TEMPERATURE

  • SALINITY

  • ICE DRAFT
Access constraints
License
Use constraints
License
Other constraints

Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

Spatial representation type
Vector
Language
English
Character set
UTF8
Topic category
  • Oceans
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S
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W
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Supplemental Information

This dataset was produced within the OCEAN ICE project (Ocean-Cryosphere Exchanges in Antarctica: Impacts on Climate and the Earth System), funded by the European Union under Horizon Europe Grant Agreement No. 101060452.
Reference system identifier
WGS 1984
Distribution format
  • NetCDF ()

OnLine resource
Freshwater Sources dataset on Zenodo ( WWW:LINK-1.0-http--link )

Zenodo repository record, DOI and access point for Ocean_freshwater_sources_fractions.nc.

OnLine resource
Associated JGR: Oceans publication ( WWW:LINK-1.0-http--link )

Scientific publication describing the dataset and machine-learning methodology.

Hierarchy level
Dataset
Statement

Co-located observations of stable oxygen isotopic composition (d18O), salinity and temperature from NASA-GISS and CISE-LOCEAN datasets, complemented by individual cruise observations available through the British Oceanographic Data Centre, were assembled and analysed using a Self Organizing Map machine-learning method. The method identifies distinct salinity-d18O relationships among water masses and was used to infer point estimates of meteoric-water and sea-ice-meltwater fractions and the stable oxygen isotopic composition of meteoric water. The resulting derived estimates are distributed as a NetCDF file.
File identifier
23f5cde7-eeef-44d5-8d6f-43f2046fe944 XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2026-08-26T15:55:19
Metadata standard name

ISO 19115:2003/19139
Metadata standard version

1.0
Point of contact
 
Point of contact
  ETT S.p.A. -
 
 

Overviews

overview

Spatial extent

N
S
E
W
thumbnail


Keywords

GEMET - INSPIRE themes, version 1.0
Oceanographic geographical features
Global Change Master Directory (GCMD) Keywords
ICE DRAFT OCEAN CIRCULATION OCEAN CURRENTS SALINITY WATER TEMPERATURE

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