In this new approach for CMIP the "historical" scenario will stop before the latest full year (likely in 2021). Scenario data will start with several years of common data before diverging. This achieves two things:
1) Data for the most recent years will be more robust and provides an additional year of historical data. ("historical" run + first few scenario years = full set of historical data)
2) In following years this allows us to provide extension data anchored at the CMIP historical stop year. This will facilitate extension of the CMIP historical ensembles to simulate historical climate over recent years.
Emissions out to 2022 are now available for evaluation and testing. CMIP7 historical emissions will be released in Jan 2025. Extension from 2021 through 2024 released in July 2025 as part of future scenario data.
While we will release data out to 2023 in January, the last 1-2 years of this data, in particular, contain many assumptions and approximations. This means these values are more likely to change in future releases.A
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