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UID:20250801T035814EDT-5826R9Lo9v@132.216.98.100
DTSTAMP:20250801T075814Z
DESCRIPTION:Please join us as we welcome Dr. Ji Nie from the Lamont Doherty
  Earth Observatory at Columbia University for his seminar titled Triggers 
 and Feedback in the 2010 Pakistan Flood: Modeling Extreme Precipitation wi
 th Interactive  Large-Scale Ascent. Refreshments will be served.\n\nAbstra
 ct\n\nThe large-scale triggers and the convective heating feedback in the 
 2010 Pakistan extreme precipitation events are examined within the Column 
 Quasi-Geostrophic framework\, which allows modeling convection with intera
 ctive large-scale vertical motion. Forcing a cloud-revolving model with th
 e large-scale forcings obtained from reanalysis data\, we successfully rep
 roduced the 2010 events. The positive feedback of convective heating to la
 rge-scale dynamics is essential in amplifying the precipitation intensity 
 to the observed values. Orographic lift is the most important dynamical tr
 iggers in both events\, while potential vorticity (PV) forcing also contri
 butes to the triggering of the first event. Horizontal moisture advection 
 modulates the extreme events mainly by setting the environment humidity\, 
 which controls the amplitude of responses of convection to the dynamic for
 cings. Representing convection by a single-column model (SCM) or an effect
 ive static stability leads to substantial discrepancies in simulation resu
 lts. The SCM underestimates the triggering effects of the upper-level PV f
 orcing and is subject to a much weaker sensitivity on environmental humidi
 ty. The effective static stability can be tuned to match extreme precipita
 tion triggered by the upper-level PV forcing. However\, it does not approp
 riately capture the triggering effects of orographic lift and lacks the de
 pendencies of convection on environmental humidity.\n
DTSTART:20160108T203000Z
DTEND:20160108T213000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Seminar: Dr. Ji Nie
URL:/meteo/channels/event/seminar-dr-ji-nie-257548
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