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An Approach for the Aggregation of Aerodynamic Surface Parameters in Calculating the Turbulent Fluxes over Heterogeneous Surfaces in Atmospheric Models

Boundary Layer Evolution and its Influence on Ground-Level Ozone Concentrations

Environmental Fluid Mechanics : Volume 2, Issue 3, September 2002

Environmental Fluid Mechanics : Volume 2, Issue 1-2, June 2002

Environmental Fluid Mechanics : Volume 1

Boundary Layer Evolution and its Influence on Ground-Level Ozone Concentrations

Content Provider	Springer Nature Link
Author	Athanassiadis, Georgios A. Rao, S. Trivikrama Ku, Jia Yeong Clark, Richard D.
Copyright Year	2002
Abstract	Accurate determination of the planetary boundary layer (PBL) height (i.e., mixing height (MH)) is critical to properly simulating pollutant levels with the grid-based photochemical models. In this study, the daytime mixing heights based on the parcel and bulk Richardson number methods are compared with those obtained directly from a numerical mesoscale meteorological model in an effort to evaluate the uncertainties in the estimation of the PBL evolution. Mixing heights are estimated from hourly outputs of meteorological variables of the Penn State/NCAR Mesoscale Model Version 3.3 (MM5V3) with two PBL schemes (Blackadar and Gayno-Seaman) during July 1999 over Philadelphia, PA. An analysis of the diurnal variation in the urban PBL and its influence on ground-level ozone (O3) levels is presented in this paper. The results indicate that on average, the MHs determined from the bulk Richardson number were larger than those estimated from the parcel method. The MHs from the MM5V3 output were much smaller than those derived from the parcel and bulk Richardson number methods, especially for the Gayno-Seaman scheme that is based on turbulent kinetic energy. The MH and ground-level O3 concentration have been found to be twice as much on episode days than on non-episode days. The average hourly MH growth rate and O3 tendency (i.e. rate of change in O3) were largest during the morning hours (0700 to 1000 eastern standard time (EST)), suggesting that vertical mixing contributes significantly to the accumulation of ground-level O3 in urban areas in the morning hours.
Starting Page	339
Ending Page	357
Page Count	19
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	2
Issue Number	4
e-ISSN	15731510
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Meteorology/Climatology Oceanography Mechanics Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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