Accession Number : ADA324696

Title :   Boundary Layer Coherent Structures, AASERT Supplement.

Descriptive Note : Final rept. 1 Jun 93-31 May 96,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF METEOROLOGY

Personal Author(s) : Shirer, Hampton N. ; Young, George S.

PDF Url : ADA324696

Report Date : 31 MAY 1996

Pagination or Media Count : 8

Abstract : It is apparent that a substantial portion of the air/sea 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 air/sea 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 air/sea fluxes produced by these coherent structure types.of Miguchi (1988).

Descriptors :   *STRUCTURES, *COHERENCE, *BOUNDARY LAYER, *STATISTICAL ANALYSIS, SHEAR PROPERTIES, DATA BASES, SPATIAL DISTRIBUTION, FLUX(RATE), ATMOSPHERIC TEMPERATURE, CONVECTION, THREE DIMENSIONAL, MARINE ATMOSPHERES, MATHEMATICS, MOISTURE, AIR WATER INTERACTIONS, ROTATION, CIRCULATION, MOMENTUM.

Subject Categories : Fluid Mechanics
      Meteorology
      Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE