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 fraction in the ocean polar watermasses, as well as the global stable oxygen isotopic composition (d18O) of meteoric water. These estimates were inferred from co-located d18O, salinity and temperature observations from NASA-GISS (Schmidtet al., 1999) and CISE-LOCEAN (Reverdin et al., 2022) datasets, as well as individual cruise data available at the British Oceanographic Data Centre ( https://www.bodc.ac.uk/), through the Self Organizing Map machine learning approach to identify distinct salinity-d18O relationships in water masses. More information can be found in the associated manuscript Davila et al. (2025).
Please cite as: Davila et al., Freshwater Sources in the Global Ocean through Salinity-d18O Relationships: A Machine Learning Solution to a Water Mass Problem; JGR:Oceans (2025), DOI: 10.1029/2024JC022122
Simple
Identification info
- Date (Publication)
- 2025-10-15
- Purpose
- To provide globally coherent estimates of meteoric water and sea ice meltwater contributions to polar and subpolar ocean water masses using salinity, temperature and stable oxygen isotope observations and a Self-Organizing Map machine learning approach.
- Status
- Completed
Originator
- Spatial representation type
- Vector
- Topic category
-
- Oceans
Extent
Temporal extent
- Time period
- 1980-01-01 2023-12-31
Extent
))
Extent
- Maintenance and update frequency
- Not planned
- Keywords
-
- OCEAN ICE
- Sea ice meltwater fraction
- machine learning
- Meteoric water fraction
- δ18O of meteoric water
- δ18O
- Salinity
- Temperature
- Keywords (Theme)
-
- water masses
- Global Change Master Directory (GCMD) Keywords
-
- SALINITY
- SEA ICE
- WATER TEMPERATURE
- Continents, countries, sea regions of the world.
-
- Arctic Ocean
- Southern Ocean
Resource constraints
- Access constraints
- License
- Use constraints
- License
- Other constraints
- Creative Commons Attribution 4.0 https://creativecommons.org/licenses/by/4.0/deed.en
- Language
- English
- Character encoding
- UTF8
- Supplemental Information
- This dataset was produced in the framework of the OCEAN:ICE project – Ocean-Cryosphere Exchanges in ANtarctica: Impacts on Climate and the Earth System, funded by the European Commission under Horizon Europe, Grant Agreement No. 101060452.
Content Information
Property description
- Abstract
- false
Elements
- Definition
- Definition
Distribution Information
- OnLine resource
-
OCEAN ICE Zenodo Community
Landing page and access point for the dataset.
- OnLine resource
-
Ocean_freshwater_sources_fractions.nc
NetCDF containing estimates of meteoric water fraction, sea ice meltwater fraction and meteoric water stable oxygen isotopic composition.
Resource lineage
- Statement
- The dataset was derived from co-located stable oxygen isotope (δ18O), salinity and temperature observations obtained from the NASA-GISS Seawater Oxygen-18 Database, the CISE-LOCEAN datasets and individual cruise datasets available through the British Oceanographic Data Centre. A Self-Organizing Map (SOM) unsupervised machine learning approach was applied to the co-located observations to identify distinct water masses and characterize regional salinity-δ18O relationships. The resulting relationships were used to estimate the stable oxygen isotopic composition of meteoric water. A three-endmember mixing model was subsequently applied to derive the contributions of meteoric water and sea ice meltwater to polar and subpolar ocean water masses.
- Hierarchy level
- Dataset
Reference System Information
- Reference system identifier
- WGS 1984
Metadata
- Metadata identifier
- urn:uuid/106dd220-a604-4bd0-9e14-573dc845d25a
- Language
- English
- Character encoding
- anyValidURI
Point of contact
Type of resource
- Resource scope
- Dataset
- Metadata linkage
- https://catalog.s4oceanice.eu:/geonetwork/srv/api/records/106dd220-a604-4bd0-9e14-573dc845d25a
- Date info (Revision)
- 2026-08-24T13:20:34
- Date info (Creation)
- 2005-03-31T19:13:30
Metadata standard
- Title
- ISO 19115-3
Overviews
Spatial extent
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