Disentangling anthropogenic and dynamic contributions to recent ocean warming

Lee, J., Tailleux, R. ORCID: https://orcid.org/0000-0001-8998-9107 and Kuhlbrodt, T. ORCID: https://orcid.org/0000-0003-2328-6729 (2025) Disentangling anthropogenic and dynamic contributions to recent ocean warming. npj Climate and Atmospheric Science, 8. 157. ISSN 2397-3722 doi: 10.1038/s41612-025-01043-7

Abstract/Summary

As the ocean absorbs over 90% of excess radiative heat, recent ocean warming is shaped by a combination of anthropogenic surface heat gain and dynamical processes redistributing heat. To distinguish these contributions, we introduce a novel framework that decomposes temperature changes into three components: ‘spice’ (density-compensated variability) and ‘heave’ (density-contributing variability), with heave further divided into ‘passive’ (net warming) and ‘dynamic’ (redistribution) contributions. Passive heave captures anthropogenic warming subducted along isopycnals, while spice and dynamic heave, which globally sum to zero, represent heat redistribution. Observations and climate models demonstrate general agreement on passive heave, establishing it as a key oceanic fingerprint of anthropogenic climate change. In contrast, dynamic heave, driven by interannual-to-decadal variability, exhibits significant spatial heterogeneity, with notable discrepancies between models and observations. This framework links ocean heat uptake to sea-level change, with passive heave driving global thermosteric rise and dynamic heave contributing to regional dynamic sea level changes.

Item Type	Article
URI	https://centaur.reading.ac.uk/id/eprint/122559
Identification Number/DOI	10.1038/s41612-025-01043-7
Refereed	Yes
Divisions	Interdisciplinary Research Centres (IDRCs) > Walker Institute Science > School of Mathematical, Physical and Computational Sciences > NCAS Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	Nature Publishing Group
Download/View statistics	View download statistics for this item