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UID:20250801T170838EDT-7480k5DBXs@132.216.98.100
DTSTAMP:20250801T210838Z
DESCRIPTION:Abstract\n\nThe mountain-plain solenoid and the sea breeze are 
 both thermally-driven circulations forced by differential surface heating.
  Although each circulation has been studied intensively on its own\, the i
 nteractions between the two remain poorly understood. While some studies s
 uggest an enhancement of the sea-breeze circulation and/or propagation ove
 r mountains\, others suggest the opposite. To gain insight into these inte
 ractions\, a series of large-eddy simulations of diurnally heated airflow 
 over idealized island terrain of different heights is conducted. As the si
 mulated island terrain height increases\, the sea-breeze front accelerates
  faster inland but its cross-frontal circulation weakens dramatically. Ove
 r sufficiently tall islands\, the sea-breeze front vanishes entirely as it
  ascends the slope. The orographic effects on the sea-breeze are quantifie
 d by tracking the frontogenesis in a sea-breeze and terrain-following refe
 rence frame. This analysis shows that the slope-parallel convergence\, hor
 izontal advection\, and frontal baroclinicity all decrease sharply as the 
 island terrain height increases. Further examination of the frontal conver
 gence budget reveals that the convergence-generating terms (along-slope co
 nvergence and vertical advection) decrease sharply as the island terrain h
 eight increases\, but the decrease is largely balanced by the reduction in
  the divergence-generating terms (along-slope tilting and horizontal advec
 tion). This leaves the two remaining terms in the budget\, the along-slope
  gradients of pressure gradient and buoyancy forces\, the former (latter) 
 of which strengthens (weakens) the convergence\, as the lone factors diffe
 rentiating the frontal convergence between the cases. While the pressure g
 radient term dominates over flat terrain\, the magnitude of the buoyancy t
 erm gradually increases with island terrain height\, which largely cancels
  the convergence-generating effect of the former. This causes the frontal 
 convergence and\, in turn\, the frontal circulation\, to weaken relative t
 o the flat terrain case. These results can be summarized more intuitively 
 as follows: as the terrain height increases\, the increasing along-slope b
 uoyancy draws pre-frontal air more rapidly up the slope\, which weakens th
 e cross-frontal convergence that drives sea-breeze frontogenesis.\n\n
DTSTART:20161026T183000Z
DTEND:20161026T193000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Student Seminar: David Wang
URL:/meteo/channels/event/student-seminar-david-wang-2
 62518
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