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PhD Defense

Department of Atmospheric Science

Tue., Nov. 27, 3:10 pm, EN6085

Characterizing Marine Boundary Layer Clouds Associated with Coastally Trapped Disturbances

Timothy Juliano

University of Wyoming


This presentation will focus on marine stratiform clouds that form during a southerly flow regime offshore California. Modeling marine low clouds and fogs in coastal environments remains an outstanding challenge due to the inherently complex ocean-land-atmosphere system. This is especially important in the context of global circulation models due to the profound radiative impact of these clouds.

The first part of the talk will investigate 23 coastally trapped disturbance (CTD) events using several data products, including model reanalyses, buoys, and satellites. For the first time, satellite retrievals suggest that CTD cloud decks may play a unique role in the radiation budget due to a combination of aerosol sources that enhance cloud droplet number concentration and reduce cloud droplet effective radius. This particular type of cloud regime should therefore be treated differently than that which is more commonly found in the summertime months over the northeast Pacific Ocean.

The second part of the talk will utilize aircraft and satellite measurements, in addition to numerical simulations using the Weather Research and Forecasting (WRF) model, to examine a CTD event. A set of WRF configurations suggests that the treatment of model physics strongly influences CTD cloud field evolution. Moreover, cloud water-soluble ionic composition analyses conducted for two other CTD cases indicate that continental aerosol sources may impact CTD cloud decks.

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University of Wyoming,

Atmospheric Science,

EN 6034

Dept. 3038

1000 E. University Ave.

Laramie, WY 82071

Phone: (307)766-3245


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