Accession Number:

ADA295701

Title:

Lagrangian Stochastic Modeling of Dispersion in the Planetary Boundary Layer.

Descriptive Note:

Final rept. 15 May 90-4 Apr 95,

Corporate Author:

COLORADO UNIV AT BOULDER

Personal Author(s):

• Weil, Jeffrey C.

Report Date:

1995-04-04

Pagination or Media Count:

14.0

Abstract:

An existing Lagrangian stochastic model for dispersion in the convective boundary layer CBL was extended in two main ways. First, a model for the mean field dispersion in a rapidly-evolving CBL was developed and calculations of the crosswind-integrated concentration CWIC were carried out for a range of conditions. Second, a Lagrangian model for the CWIC and the mean and root-mean-square concentrations was developed that uses the velocity fields from large-eddy simulations as input. Calculations of the CWIC fields were made for three source heights and showed good agreement with the convection tank measurements of Willis and Deardorff. AN

Descriptors:

• *MATHEMATICAL MODELS
• *CONVECTION(ATMOSPHERIC)
• *PLANETARY ATMOSPHERES
• VELOCITY
• SIMULATION
• STOCHASTIC PROCESSES
• TIME DEPENDENCE
• BOUNDARY LAYER
• TURBULENT FLOW
• PROBABILITY DENSITY FUNCTIONS
• PARTICLES
• HEAT FLUX
• DISPERSIONS
• LAGRANGIAN FUNCTIONS
• CUMULUS CLOUDS
• CROSSWINDS

Subject Categories:

• Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE