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SUMMARY:Acceleration of tropical cyclogenesis by self-aggregation feedback
 s - Caroline Muller (ENS Paris)
DTSTART:20180316T160000Z
DTEND:20180316T170000Z
UID:TALK99280@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:Idealized simulations of tropical moist convection have reveal
 ed that clouds can spontaneously clump together in a process called self-a
 ggregation. This results in a state where a moist cloudy region with inten
 se deep convection is surrounded by extremely dry subsiding air devoid of 
 deep convection. Because of the idealized settings of the simulations wher
 e it was discovered\, the relevance of self-aggregation to the real world 
 is still debated. Here we show that self-aggregation feedbacks play a lead
 ing-order role in the spontaneous genesis of tropical cyclones in cloud-re
 solving simulations. Those feedbacks accelerate the cyclogenesis process b
 y a factor of two\, and the feedbacks contributing to the cyclone formatio
 n show qualitative and quantitative agreement with the self-aggregation pr
 ocess. Once the cyclone is formed\, WISHE effects dominate\, though we fin
 d that self-aggregation feedbacks have a small but non negligible contribu
 tion to the maintenance of the mature cyclone. Our results suggest that se
 lf-aggregation\, and the framework developed for its study\, can help shed
  some new light into the physical processes leading to cyclogenesis and cy
 clone intensification. In particular\, our results point out the importanc
 e of the longwave radiative cooling outside the tropical cyclone.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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