Welcome to the data hub for the land and ocean models behind the Global Carbon Budget (GCB). Here you can browse and download the underlying model data.
The global and country-level summary spreadsheets (carbon emissions and sinks) can be found on the GCB data hub here.
On this page, you will find land (TRENDY) and ocean model output from the current and previous Global Carbon Budgets.
Besides the net land sink and surface fCO₂ and air-sea CO₂ flux data that is made available open access, we provide additional output from the Dynamic Global Vegetation Models (DGVMs) that contribute to the TRENDY initiative, and from the Global Ocean Biogeochemical models and fCO₂ products (GCB-ocean). These data are freely available under the following data policy.
Our main objective is to make all data available to the wider scientific community. For the most recent data set (TRENDY-GCB2025 and ocean-GCB25 used in Global Carbon Budget 2025), co-authorship of the contributing modellers depends on the importance of the TRENDY or GCB-ocean data in your study and must be discussed with the respective coordinators early in the process.
TRENDY coordinators:
GCB-ocean coordinators:
All studies should be circulated to the modelling groups prior to submission.
If TRENDY-GCB2025 or GCB-ocean forms a significant part of a publication or conference presentation (whether or not it does will be a joint decision with the coordinators), the modelling groups and coordinators should be invited as co-authors, with sufficient lead time to allow meaningful input (minimum 3 weeks before submission; earlier engagement is encouraged).
If TRENDY or GCB-ocean results are only a minor component (for example, a figure showing the multi-model mean mean), then it is sufficient to acknowledge the TRENDY or GCB-ocean projects (again, this should be agreed with the coordinators).
Please cite the relevant references:
For any issues or enquiries regarding this data browser, please contact
Mike O'Sullivan – m.osullivan@exeter.ac.uk.
Last update: November 2025.