Physical processes in coastal stratocumulus clouds from aircraft measurements during UPPEF 2012
Tellado, Pamela A.
MetadataShow full item record
The objective of this thesis was to perform the initial analysis of aircraft measurements from the field campaign of the Unified Physical Parameterization for Extended Forecast (UPPEF 2012). We examined the general characteristics of the observed stratocumulus-topped boundary layers and identified cases for future in-depth studies. We first determined the boundary layer heights from all sounding profiles. The results indicated the sharp westward increase of boundary layer height is limited to ~200 km offshore with an average slope of 2m per kilometer. Substantial west-east spatial variability of thermodynamic properties is also observed from vertical profiles. The sea surface temperature (SST) in the region varied significantly. Near surface measurements over the warm and cold SST regions for three cases were analyzed and compared. This research found that the small scale variability in the SST resulted in significant variation in the surface exchange of sensible and latent heat fluxes, and wind stress. Such variability makes it difficult to correctly parameterize surface fluxes. The presence of cool downdrafts in the upper cloud layer is evident in the joint probability density distribution and buoyancy flux profiles. The results from this research will guide future cloud parameterization scheme development in forecast models.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Campbell, Jeffrey William (Cambridge, Massachusetts : Massachusetts Institute of Technology : Woods Hole Oceanographic Institution, 1988);Part of the N.E. Pacific was studied to evaluate and use altimetric data from the Navy Geodetic Satellite GEOSAT. The zero-order accuracy of the major GEOSAT geophysical data record (GDR) channels was verified, and occasional ...
A modal/WKB inversion method for determining sound speed profiles in the ocean); (Degree of Ocean bottom Casey, Kevin Donald (1988);Two approaches to determining the ocean sound profile using measured acoustic modal eigenvalues are examined. Both methods use measured eigenvalues and mode dependent assumed values of the WKB phase integral as input data ...
Anderson, Travis J. (2013-06);Ship operational profiles are a valuable tool for ship designers and engineers when analyzing potential designs and ship system selections. The most common is the speed-time profile, normally depicted as a histogram showing ...