This dashboard is created based on the IAP Ocean Compound Climatic impact-drivers (CIDs) Monitoring Dataset (Tan et al., 2025) that integrates global, three-dimensional observations of physical and biogeochemical variables (temperature, salinity, dissolved oxygen, and pH) to capture long-term, compound ocean state changes with global coverage (1-degree) from the surface to mesopelagic zone since the 1980s. We aim to provide an assessment framework and tool to enable the climate scientisics and climate policy-makers to (1) move from looking at the change in each variable on its own to combining them into a multivariate composite index (i.e., how ocean state is changing simultaneously), and (2) to determine when the ocean has transitioned into a new state and how deep these changes penetrate –– critical insights for monitoring and mitigating ocean climate risks.
With this dashboard, you can:
(1) explore how ocean state is transforming quickly and simultaneously in the global scale since 1980 in depth by moving the year slider and selecting different layers: surface, epipelagic (0-200m) or mesopelagic (200-1000m) zone (left top panel and right panel).
(2) determine the regions that are the most impacted by the compound ocean state change (left top panel)
(3) explore the spatial stucture of single, double and triple compound climatic impact-drivers in temperature, salinity and dissolved oxygen by toggling the CID type and hovering over the global maps for detailed values (right panel)
(4) explore when ocean state simultaneous changes first emerge at different depths using the Time-of-Emergence maps (right panel).
(5) determine how much the percentage of the global ocean in the High Sea (in relation to the UN BBNJ treaty) has already undergone significant shifts in individual or compound properties compared to 60 years ago (left bottom panel).
The IAP Ocean Compound Climatic impact-drivers (CIDs) Monitoring Dataset can be accessed via http://www.ocean.iap.ac.cn/ftp/cheng/Compound_CIDs/ or https://github.com/zqtzt/Compound_ocean_climate_change
Citation: Tan, Z., K. v. Schuckmann, S. Speich, L. Bopp, J. Zhu, and L. Cheng*. (2025): Observed large-scale and deep-reaching compound ocean state changes over the past 60 years. Nature Climate Change. https://www.nature.com/articles/s41558-025-02484-x
Any questions/suggestions could be reached: Zhetao Tan(zhetao.tan@lmd.ipsl.fr); Lijing Cheng(chenglij@mail.iap.ac.cn)