@@ -22,6 +22,39 @@ of rst and use slightly different categories.
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2323<!-- towncrier release notes start -->
2424
25+ ## input4MIPs CVs v6.7.25 (2026-02-17)
26+
27+
28+ ### ⚠️ Breaking Changes
29+
30+ - Added data with the source ID ` FZJ-CMIP-ozone-2-0 ` .
31+ This data updates the historical forcing data provided in ` FZJ-CMIP-ozone-1-2 ` .
32+
33+ As a result of an issue being found ([ #400 ] ( https://github.com/PCMDI/input4MIPs_CVs/issues/400 ) ),
34+ models that rely on exogenous ozone forcing are now required to use different versions of the ozone files
35+ for pre-industrial control (and related) simulations and historical (and related) simulations.
36+ For all historical (and related) simulations, files with the source ID ` FZJ-CMIP-ozone-2-0 ` should be used.
37+ For pre-industrial control (and related) simulations, files with the source ID ` FZJ-CMIP-ozone-1-2 ` should be used
38+ (note that this guidance differs from the email communication sent by the CMIP IPO on 12 February 2026).
39+ For details of your options for pre-industrial control simulations,
40+ please see [ the ozone dataset page] ( https://input4mips-cvs.readthedocs.io/en/latest/dataset-overviews/ozone/ ) .
41+
42+ The CMIP Panel co-chairs are recommending that,
43+ for modelling centres who rely on ozone as an external forcing,
44+ historical, and other relevant DECK (e.g., AMIP), simulations
45+ should be re-run with the ` FZJ-CMIP-ozone-2-0 ` ozone if possible.
46+ (Pre-industrial control simulations do not need to be re-run
47+ because they are unaffected by the release of ` FZJ-CMIP-ozone-2-0 ` .)
48+
49+ If any modelling centres cannot re-run their historical simulations,
50+ they should contact the ozone forcing providers for guidance on
51+ how to ensure a smooth connection between the scenario ozone forcing files.
52+
53+ If any modelling centres run historical simulations
54+ with both the ` FZJ-CMIP-ozone-1-2 ` and ` FZJ-CMIP-ozone-2-0 ` forcing,
55+ these simulations would be of interest to the Forcings Task Team. ([ #413 ] ( https://github.com/PCMDI/input4MIPs_CVs/pull/413 ) )
56+
57+
2558## input4MIPs CVs v6.7.24 (2026-02-16)
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2760
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