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CATEGORIES:Class/Seminar
DESCRIPTION:Convection-wave coupling is a central topic in tropical atmosph
 eric dynamics. To understand how clouds respond to wave-like large-scale ve
 rtical motion with varying periods\, we build a microscopic cloud ensemble 
 model with multiple independent cloud members. The lifecycle of each cloud 
 member is simulated as a dual-threshold process of boundary layer equivalen
 t potential temperature\, which evolves alternatively between the shallow a
 nd deep convective stages. The stage alternation is characterized by the el
 imination of convective inhibition energy (CIN) and the exhaustion of conve
 ctive available potential energy (CAPE). The cloud response exhibits two re
 gimes. When the wave period is close to the convective lifecycle timescale\
 , the cloud ensemble exhibits a resonant response\, with individual clouds 
 being synchronized to the wave. The rainfall rate lags the low-level large-
 scale vertical velocity. When the wave period is much longer than the conve
 ctive lifecycle timescale\, the cloud ensemble exhibits a quasi-equilibrium
  response. The rainfall rate does not significantly lag the low-level large
 -scale vertical velocity\, and synchronization is weak. The cloud synchroni
 zation is caused by the phase and frequency adjustment of individual clouds
 \, which is conducted by the modulation of CIN by temperature in the lower 
 troposphere and the modulation of CAPE by moisture convergence in the bound
 ary layer. Based on the microscopic cloud ensemble model\, an analytical th
 eory of the rainfall response amplitude and response phase is derived\, whi
 ch generally agrees with cloud-permitting simulations.\n\nDr. Hao Fu is cur
 rently a faculty member at Nanjing University\, studying the fluid dynamics
  of tropical cyclones\, waves\, and clouds. He earned his Ph.D. from Stanfo
 rd University\, under the supervision of Prof. Morgan O’Neill\, and receive
 d Stanford Earth System Science Award for Scholarly/Research Achievement. H
 e was a fellow of the WHOI GFD Program (2023) and a T. C. Chamberlin postdo
 ctoral fellow (2023-2025) at the University of Chicago\, working with Prof.
  Da Yang. He enjoys applying a combination of theoretical models\, numerica
 l simulations\, and laboratory experiments to understand weather and climat
 e.
DTEND:20251211T210000Z
DTSTAMP:20260307T113956Z
DTSTART:20251211T200000Z
GEO:37.426402;-122.172635
LOCATION:Mitchell Earth Sciences\, 350/372
SEQUENCE:0
SUMMARY:Geophysics Special Seminar - Hao Fu\, "Regimes of convective respon
 se to large-scale forcing"
UID:tag:localist.com\,2008:EventInstance_51497833691317
URL:https://events.stanford.edu/event/geophysics-special-seminar-hao-fu-reg
 imes-of-convective-response-to-large-scale-forcing
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