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Observations of the Diurnal Cycle of Marine Stratocumulus Clouds and Precipitation. Casey Burleyson 1 , Sandra Yuter 1 , a nd Simon de Szoeke 2 1 North Carolina State University 2 Oregon State University. Goals.

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observations of the diurnal cycle of marine stratocumulus clouds and precipitation

Observations of the Diurnal Cycle of Marine Stratocumulus Clouds and Precipitation

Casey Burleyson1, Sandra Yuter1,

and Simon de Szoeke2

1 North Carolina State University

2 Oregon State University

goals
Goals
  • Document the diurnal variation of important features of the cloud deck to aid in validation of model output.
  • Examine to what degree drizzle varies in time and space.
  • Begin to understand the controlling factors that cause drizzle to start and stop.

Slide 2/16

d ata from the r h brown
Data from the R.H. Brown

EAST

WEST

Data were divided into two regions, east and west of 80°W, to account for longitudinal changes to boundary layer characteristics.

Slide 3/16

conclusions
Conclusions
  • The diurnal cycle is clearly evident in every variable examined. Diurnal fluctuations in cloud depth, precipitation, and boundary layer mixing should be key features in simulations of STBLs.
  • Overnight the cloud depth is similar over all longitudes. The cloud deck thins rapidly after sunrise.
  • Heavy drizzle that occurs in the west is self-limiting, maximizing near 3 am. Lighter drizzle in the east only diminishes after the sun comes up.