Boundary Layer Coherent Structures, AASERT Supplement.
Final rept. 1 Jun 93-31 May 96,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF METEOROLOGY
Pagination or Media Count:
It is apparent that a substantial portion of the airsea fluxes of heat, moisture, and momentum is accomplished via intermittent processes Khalsa and Greenhut 1985, processes that are rather poorly understood. Recently, Mahrt 1989 and Sikora and Young 1993 demonstrated that coherent structures in the marine boundary layer MBL are responsible for this flux-carrying intermittency. These coherent structure types include such secondary circulations as two-dimensional rolls cloud streets, three-dimensional convective cells thermals, and shear-driven eddies billows Brown 1980. These features occur in different atmospheric boundary layer thermal stratification and shear regimes some are forced primarily by thermal, and others by dynamic, mechanisms. Indeed, using the soaring patterns of birds, Woodcock 1975 determined the airsea temperature differences and- 10 m wind speeds typically associated with these two- and three-dimensional responses. Our ultimate research goal, then, is to determine the mechanisms underlying the intermittency in airsea fluxes produced by these coherent structure types.of Miguchi 1988.
- Fluid Mechanics
- Physical and Dynamic Oceanography