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SUMMARY:SPC Seminar – Climate – Anna Mackie (St Andrews)
DESCRIPTION:Speaker: Anna Mackie (St Andrews)\nTitle: More frequent and mor
 e intense convective downdrafts with warming in km-scale simulations: what
  are potential implications for cloud feedback estimates?\nAbstract: The r
 esponse of clouds to a warming atmosphere is uncertain\, in part due to th
 e length scales of tropical motions – which influence cloud formation 
 – being smaller than those typically resolved in global climate models (
 GCMs). In these models\, small-scale upwards and downwards motions need to
  be inferred from resolved\, larger-scale motions\, introducing uncertaint
 y. Here we use multi-year simulations of the west Pacific at convection-pe
 rmitting resolution in present-day and warmer climates to show an increase
  in the frequency and intensity of downdrafts in convective cores. The exp
 licit simulation of downdrafts leads to fundamental differences in cloud-c
 irculation interactions compared to previous GCM studies. These changes ma
 y be sufficient to impact estimates of how clouds change with warming. In 
 particular\, we demonstrate that intensifying downdrafts may reduce the ex
 tent to which clouds cool the Earth system\, with implications for future 
 climate projections.
URL:https://www.imperial.ac.uk/events/208052/spc-seminar-climate-anna-macki
 e-st-andrews/
DTSTART;TZID=Europe/London:20260331T113000
DTEND;TZID=Europe/London:20260331T123000
LOCATION:711c\, Huxley Building\, South Kensington Campus\, Imperial Colleg
 e London\, London\, SW7 2AZ\, United Kingdom
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