What question did this study set out to answer?

The primary aim is to evaluate the performance of the MIROC6-iso model in simulating isotopic variations related to climate interactions.

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February 2, 2026Open Access

Improved response of δ18Osw in the Pacific Ocean to atmosphere-ocean interaction and ENSO using the isotope-enabled Fully Coupled Model MIROC6-iso

Key Points

The primary aim is to evaluate the performance of the MIROC6-iso model in simulating isotopic variations related to climate interactions.
Introduced a fully coupled isotopic version of MIROC6 (MIROC6-iso).
Assessed isotopic variations in precipitation, water vapor, and ocean water with observational data.
Evaluated relationships of δ¹⁸O with temperature and salinity.
MIROC6-iso accurately reproduces spatial isotopic variations in key oceanic and atmospheric elements.
The model effectively demonstrates the connections between δ¹⁸O and environmental variables like temperature and salinity.

Abstract

This study introduces the fully coupled isotopic version of the Model for Interdisciplinary Research on Climate version 6 (MIROC6-iso). MIROC6-iso exhibits good performance in reproducing spatial isotopic variations in precipitation, water vapor, and ocean water, and the relationships of δ¹⁸O with temperature and salinity against observations. This study shows that MIROC6-iso is useful to reconstruct past climate changes and examine the recent changes in the water cycle. We plan to extend this work by adding more datasets (such as pre-industrial and mid-Holocene simulations) and including additional variables.If you’d like any of the data or the source code, please feel free to email the authors. we’d be happy to share.

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