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Supercooled altocumulus clouds

Supercooled altocumulus clouds. Met Office models have most sophisticated cloud scheme Separate prognostic liquid and ice … but have the worst supercooled liquid water content and liquid cloud fraction What are we doing wrong in these schemes ? Poor vertical resolution (~500 m)

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Supercooled altocumulus clouds

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  1. Supercooled altocumulus clouds • Met Office models have most sophisticated cloud scheme • Separate prognostic liquid and ice • … but have the worst supercooled liquid water content and liquid cloud fraction • What are we doing wrong in these schemes? • Poor vertical resolution (~500 m) • Ice microphysics (e.g. Ice PSD)

  2. Resolution dependence: idealised simulation Ice Liquid 50 m 500 m

  3. Parameterization at work Ice Liquid 50 m 500 m

  4. Global cloud fraction verification INSECTS AEROSOL RAIN SUPERCOOL WARM LIQUID ICE + S’COOL ICE CLEAR

  5. Stationary orographic convective rainbands (HIGH terrain) – CTL CTL – (Albedo=1) Mean Wind

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