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UID:20250806T031636EDT-2720POSpoD@132.216.98.100
DTSTAMP:20250806T071636Z
DESCRIPTION:The Shallow-to-Deep Convective Transition Over an Idealized Mes
 oscale Convergence Zone\n\nAbstract\n\nThe initiation of deep convection w
 ithin a conditionally unstable atmosphere requires air parcels to reach th
 eir level of free convection\, above which latent-heat release generates p
 ositive buoyancy. However\, air parcels that satisfy this condition often 
 fail to undergo deep ascent due to mitigating factors such as entrainment 
 and adverse perturbation vertical pressure gradients. Recent studies sugge
 st that the transition from shallow-to-deep convection may additionally re
 quire the formation of evaporative cold pools\, a sufficient cloud-layer l
 apse rate\, gradual moistening of the mid-troposphere through shallow-cumu
 lus detrainment\, and/or the fortuitous development of new cumuli through 
 the remnants of their predecessors. In this study\, we use cloud-resolving
  simulations of cumulus convection over an idealized surface-based converg
 ence zone to study the mechanisms and sensitivities of deep-convection ini
 tiation forced by mesoscale ascent. The surface convergence forms in respo
 nse to a localized diurnal heating anomaly over an otherwise homogenous an
 d unheated surface\, producing an organized boundary-layer updraft with a 
 maximal amplitude of around 3 m/s over the center of the heat source. It g
 ives rise to a line of cumuli that gradually deepens and\, in some cases\,
  transitions into deep convection. Detailed analysis of the simulations re
 veals several notable aspects of cumulus evolution. For example\, with a t
 hermal tracking algorithm developed for the purpose\, it can be shown that
 \, in a marginally unstable atmosphere\, the average horizontal area of th
 e thermal just above the lower condensation level (LCL) is an important fa
 ctor in determining the height reached by the thermal.\n
DTSTART:20151202T193000Z
DTEND:20151202T200000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Student Seminar: Raphael Rousseau-Rizzi
URL:/meteo/channels/event/student-seminar-raphael-rous
 seau-rizzi-255062
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