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UID:20260730T175757EDT-2646B9hISh@132.216.98.100
DTSTAMP:20260730T215757Z
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\nAbstr
 act\n\nThe concept of radiative‐convective equilibrium (RCE) is the simple
 st and arguably the most elegant model of a climate system\, regarding it 
 as a statistically one‐dimensional balance between radiative and convectiv
 e heat transfer. In spite of this\, RCE is seldom studied and poorly under
 stood today. Recent advances in cloud‐system‐resolving numerical models ha
 ve made it possible to explicitly simulate such states\, simulating the co
 nvective plumes themselves rather than representing them parametrically. T
 he simulations reveal a startling phenomenon: Above a critical surface tem
 perature\, moist convection spontaneously aggregates into a single cluster
 \, in a non‐rotating system\, or into multiple tropical cyclones on a rota
 ting planet. I will show that this results from a linear instability of th
 e RCE state\, and this this instability migrates the RCE state toward one 
 of the two stable equilibria. This instability represents a subcritical bi
 furcation of the ordinary RCE state\, leading to either a dry state with l
 argescale descent\, or to a moist state with mean ascent\; these states ma
 y be accessed by finite amplitude  perturbations to ordinary RCE in the su
 bcritical 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:/channels/event/seminar-dr-kerry-emanuel-256074
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