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UID:20250511T103024EDT-7761u2oea6@132.216.98.100
DTSTAMP:20250511T143024Z
DESCRIPTION:Dr. Timothy Cronin joins us from the Department of Earth and Pl
 anetary Sciences at Havard University to discuss Island Rainfall Enhanceme
 nt and the Tropical Climate.\n\nAbstract\nTo understand why tropical islan
 ds are rainier than nearby ocean areas\, we explore how a highly idealized
  island\, differing from the surrounding ocean only in heat capacity\, mig
 ht respond to the diurnal cycle and influence the tropical climate\, espec
 ially the spatial distribution of rainfall and the thermal structure of th
 e troposphere. We perform simulations of three-dimensional radiative-conve
 ctive equilibrium with the System for Atmospheric Modeling (SAM) cloud-sys
 tem-resolving model\, with interactive surface temperature\, where a highl
 y idealized\, low heat capacity circular island is embedded in a slab-ocea
 n domain. Average rainfall over the island can be more than double the dom
 ain average value\, with island rainfall occurring primarily in an intense
 \, regular thunderstorm system that forms in the afternoon to early evenin
 g each day. Island size affects the magnitude of simulated island rainfall
  enhancement\, the intensity of the convection\, and the timing of the rai
 nfall maximum relative to solar noon. A combination of dynamic and thermod
 ynamic mechanisms leads to a monotonic enhancement of domain-averaged trop
 ospheric temperature with increasing fraction of island surface\, which ma
 y contribute to localization of ascent over the Maritime Continent and its
  relationship to the Walker Circulation. Increasing island area fraction i
 n the Western Pacific over the past ~5 Ma may thus have contributed to cha
 nges in the strength of the Walker Circulation and the sea surface tempera
 ture difference between the Eastern and Western Equatorial Pacific.\nRefre
 shments will be served.\n
DTSTART:20150407T173000Z
DTEND:20150407T193000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Seminar: Dr. Timothy Cronin
URL:/meteo/channels/event/seminar-dr-timothy-cronin-25
 3640
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