1991
DOI: 10.1016/0957-1272(91)90053-h
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On the impact of snow cover on daytime pollution dispersion

Abstract: Akstract--A preliminary evaluation of the impact of snow cover on daytime pollutant dispersion conditions is made by using conceptual, scaling, and observational analyses. For uniform snow cover and synoptically unperturbed sunny conditions, observations indicate a considerable suppression of the surface sensible heat flux, the turbulence, and the development of the daytime atmospheric boundary layer (ABL) when compared to snow-free conditions. However, under conditions of non-uniform snow cover, as in urban a… Show more

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Cited by 9 publications
(3 citation statements)
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“…The combined effect of LULCC and snow is also important in terms of surface fluxes and boundary layer structure. 110,111 Figure 8 illustrates the observed large differences in lower boundary layer thermodynamic stability between a snow-covered grassland and agriculture area and an adjacent snow-free area. The very large stable surface boundary layer over the snow-covered area is a direct result of the much greater reflectance of sunlight when snow is present.…”
Section: Discussionmentioning
confidence: 99%
“…The combined effect of LULCC and snow is also important in terms of surface fluxes and boundary layer structure. 110,111 Figure 8 illustrates the observed large differences in lower boundary layer thermodynamic stability between a snow-covered grassland and agriculture area and an adjacent snow-free area. The very large stable surface boundary layer over the snow-covered area is a direct result of the much greater reflectance of sunlight when snow is present.…”
Section: Discussionmentioning
confidence: 99%
“…Conditions during the Lillestrøm experiment were far from normal, taking place during winter at -20°C with snow covered ground, low wind speeds ( < 2 m s -1 ) and a very low solar zenith angle. Furthermore, dispersion over snow covered areas is significantly different from that in the absence of snow (Segal et al 1991). Consequently, all models struggled to represent the Lillestrøm experiment adequately.…”
Section: Analysis Of Model Performancementioning
confidence: 90%
“…Therefore, unlike the stable nocturnal surface layer over bare soil, downward surface sensible and latent heat fluxes over snow cover may be high under warm-advection conditions. Sensible and latent heat fluxes of several hundred watts per square meter can occur under these conditions (e.g., Cline 1997; Leathers et al 1998;Segal et al 1991). In this situation, selecting a first model level above the surface layer may reduce the surface turbulent heat fluxes considerably, leading to underprediction of snowmelt.…”
Section: Introductionmentioning
confidence: 99%