Turbulence structure of sea breeze front and its implication in air pollution transport ? Application of k-? turbulence model ?

Abstract

ABSTRACT. A k-E turbulence model was applied to a numerical Simulation of sea breeze. The dynamical behaviors of eddy diffusivity, turbulent kinetic energy and its dissipation rate, associated with moving sea breeze front, were predicted and analyzed. Results demonstrated, for example, difference of the turbulence structure between thermal internal boundary layer and inland mixed layer, and the double maxima structures of turbulence-related quantities in their vertical profiles just behind sea breeze front. The properties of the computed sea breeze front agreed qualitatively with those of a gravity current in unstable environment, observed by Simpson et al. (1977). Furthermore, the possibility that air pollutants released in the sea breeze layer might be trapped within small circulating flow at the sea breeze front, and move with it was shown in an advection simulation of hypothetical fluid particles using flows obtained.

The Impact of Climate Change on Air Quality–Related Meteorological Conditions in California. Part II: Present versus Future Time Simulation Analysis

“…Land-sea circulation plays an important role in the meteorology and air quality in CA. The sea breeze in Southern CA follows a classical pattern similar to that described by Kitada (1987), Novitsky et al (1992), and Koo and Reible (1995). The cool marine surface air and the pollutants emitted from the coastal region of SoCAB move inland with a penetration distance that depends on the land-sea temperature contrast.…”

Climatology and impact on air quality of sea breeze in an urban coastal environment

“…The behaviour of these factors is affected by the presence of a coastline, where sea breezes frequently occur. Sea breeze can improve or worsen the regional air quality (Kitada, 1987;Hsu, 1988;Physick and Abbs, 1992;Gaza, 1998;Seaman and Michelson, 2000;Gangoiti et al, 2002), with consequences on the health of people. It is also known to provide relief from oppressive hot weather, trigger thunderstorms and provide moisture for fog.…”

CFD investigation of the atmospheric boundary layer under different thermal stability conditions

“…Based on measurements of turbulent kinetic energy budget terms in the surface layer over flat terrain (Alinot and Masson 2005), one can find: To account for buoyancy forces most studies apply the Boussinesq approximation where the density is taken to be constant (i.e. the flow is incompressible) and is assumed to vary linearly with temperature only in the gravity term of the momentum equation, Equation 3-2 (Kitada 1987, Alinot and Masson 2002, Alinot and Masson 2005, Pontiggia et al 2009, Meissner et al 2009). An alternative is to assume a weakly compressible fluid where the density is calculated using constant pressure as this leads to a faster and more stable numerical solution, and allows for the temperature profile to be more easily maintained than for the compressible situation (Huser et al 1997, Pontiggia et al 2009).…”