HR: 1340h
AN: A53B-0889    [Abstracts]
TI: Wind Regimes in Southern California Winter
AU: * conil, s
EM: conil@atmos.ucla.edu
AF: Dpt Atmospheric Oceanic Sciences UCLA, 405 Hilgard, los angeles, ca 90095 United States
AU: hall, a
AF: Dpt Atmospheric Oceanic Sciences UCLA, 405 Hilgard, los angeles, ca 90095 United States
AU: ghil, m
EM: ghil@atmos.ucla.edu
AF: Dpt Atmospheric Oceanic Sciences UCLA, 405 Hilgard, los angeles, ca 90095 United States
AB: Two different and complementary classication methods are applied to the daily mean 10m wind simulated by MM5 in Southern California during the winter 1995-2003. The MM5 model is implemented on a triply nested grid of resolutions 54/18/6km covering the western U.S. with great details over the Southern California region. The wind variability during winter is dominated by three robust wind regimes. The first wind regime describes a strong north-easterly flow over the LA basin. This regime is commonly designated as "Santa Ana" conditions in Southern California. The second regime is a moderate north-westerly flow over the ocean with a maximum in the Southern California Bight. The third wind pattern shows a stronger north-westerly wind shifted toward the South and with a maximum near Point Conception. These last two patterns are slight variants of the climatological mean winds. The first two regimes are linearly associated with some particular synoptic conditions which doesn't seem to be favored by any of the large-scale weather regimes/teleconnections of the North Pacific/North America region.
DE: 1610 Atmosphere (0315, 0325)
DE: 1620 Climate dynamics (3309)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting