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0M: updraft precipitation parameters and evaporation of the precipitation flux - #815
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…ipitation flux - Microphysics0MParams gains `precip_updraft` (Parameters0M with tau_precip = precipitation_timescale_updraft_ratio * precipitation_timescale) and `evaporation` (new Evaporation0M parameters). - New Microphysics0M.evaporate_precipitation: Kessler (1969) / IFS deficit-form evaporation rate of a precipitation flux (unlimited; limiters are left to the host model). - Docs and tests; ClimaParams compat 1.3.2. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Adds the 0M pieces needed by ClimaAtmos #4881: a below-cloud evaporation rate for the 0M precipitation flux (evaporate_precipitation, with Evaporation0M parameters) and an updraft precipitation timescale (Microphysics0MParams.precip_updraft, τ = precipitation_timescale_updraft_ratio × precipitation_timescale). Defaults are neutral (ratio 1, evaporation coefficient 0).