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UID:20250928T041322EDT-7258P3nAPj@132.216.98.100
DTSTAMP:20250928T081322Z
DESCRIPTION:Dr. Kerry Emanuel joins us from the department of Earth\, Atmos
 pheric and Planetary Sciences group at the Massachusetts Institute of Tech
 nology for his seminar titled Radiative-Convective Instability: Implicatio
 ns for Tropical Weather and Climate. Refreshments will be served.\n\n\nAbs
 tract\n\nThe concept of radiative‐convective equilibrium (RCE) is the simp
 lest and arguably the most elegant model of a climate system\, regarding i
 t as a statistically one‐dimensional balance between radiative and convect
 ive heat transfer. In spite of this\, RCE is seldom studied and poorly und
 erstood today. Recent advances in cloud‐system‐resolving numerical models 
 have made it possible to explicitly simulate such states\, simulating the 
 convective plumes themselves rather than representing them parametrically.
  The simulations reveal a startling phenomenon: Above a critical surface t
 emperature\, moist convection spontaneously aggregates into a single clust
 er\, in a non‐rotating system\, or into multiple tropical cyclones on a ro
 tating planet. I will show that this results from a linear instability of 
 the RCE state\, and this this instability migrates the RCE state toward on
 e of the two stable equilibria. This instability represents a subcritical 
 bifurcation of the ordinary RCE state\, leading to either a dry state with
  largescale descent\, or to a moist state with mean ascent\; these states 
 may be accessed by finite amplitude  perturbations to ordinary RCE in the 
 subcritical state\, or spontaneously in the supercritical state.\n
DTSTART:20151019T200000Z
DTEND:20151019T210000Z
LOCATION:Room 306\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Seminar: Dr. Kerry Emanuel
URL:/meteo/channels/event/seminar-dr-kerry-emanuel-256
 074
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