Abstract
A box and a Gaussian plume model including gas-phase photochemistry and with plume dispersion parameters estimated from the few available plume observations are proposed and used for evaluation of photochemical transformations of exhausts from a single subsonic transport aircraft. The effects of concentration inhomogeneities in the plume cross section on the photochemical sources and sinks in the plume are analyzed for various groups of compounds. The influence of these inhomogeneities on the rate and on the mass of ambient air entrainment into the plume are studied also by comparing the box and the Gaussian plume model simulations during the first hours of their "life''. Due to the enterance of HOx and NOx from ambient air into the plume with rates varying from the wind shear and turbulence conditions, the rate of emitted NOx oxidation in the plume is dependent on these and also on the background concentration levels of HOx and NOx.
Highlights
In the extensively studied sub- and supersonic aircraft exhaust atmospheric effects the problem of exhaust plume dispersion and photochemical transformations in the plume during the first minutes and hours of the plume ‘‘life’’ has been relatively less investigated (see Schumann, 1994; relevant papers in Schumann and Wurzel (Eds.) 1994; WMO, 1995)
The same relations hold during the whole plume ‘‘life’’ for most of gases as may be seen from Fig. 2, which presents the time evolution of HpluNmOe mixing ratios: at the Gaussian plume axis, at edge and integrated over the plume cross section area related to the same basic
HvaNriOant.mTixhiensge ratio in the box model for relations become close to unit at the end of plume
Summary
In the extensively studied sub- and supersonic aircraft exhaust atmospheric effects the problem of exhaust plume dispersion and photochemical transformations in the plume during the first minutes and hours of the plume ‘‘life’’ has been relatively less investigated (see Schumann, 1994; relevant papers in Schumann and Wurzel (Eds.) 1994; WMO, 1995). The time evolutions of the inputs from the photochemistry in the plume and from the ambient air entrainment to the rate of gas content change in the plume cross section are calculated and compared, for box and for diffusion plume models with various dispersion parameters, and for various air.
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