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- Author or Editor: H. van Dop x
- Journal of Applied Meteorology and Climatology x
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Abstract
A model is developed to describe the dispersion of pollutants in a coastal area when stable air masses are transported inland. It is assumed that a convective mixed layer develops over land, the height of which increases with distance from the shoreline. The vertical distribution of pollutants is assumed to be homogeneous within the mixed layer and the distribution in the stable layer aloft is assumed to be Gaussian. Pollutant concentrations in the mixed layer are obtained by analytical integration of the mass conservation equation. It is shown that the earlier and much higher estimates of continuous shoreline fumigation by Lyons and Cole (1973) and Meroney et al. (1975) can be derived from our expressions by simplifying substitutions.
Abstract
A model is developed to describe the dispersion of pollutants in a coastal area when stable air masses are transported inland. It is assumed that a convective mixed layer develops over land, the height of which increases with distance from the shoreline. The vertical distribution of pollutants is assumed to be homogeneous within the mixed layer and the distribution in the stable layer aloft is assumed to be Gaussian. Pollutant concentrations in the mixed layer are obtained by analytical integration of the mass conservation equation. It is shown that the earlier and much higher estimates of continuous shoreline fumigation by Lyons and Cole (1973) and Meroney et al. (1975) can be derived from our expressions by simplifying substitutions.
Abstract
A climatological study has been carried out of the occurrence and properties of a large number of dry and sunny spells in recent summers (1976–83). The frequency of the spells, which are very favorable for atmospheric photochemical activity, were found to be significantly higher in the investigated period than in previous years. A detailed examination of 25 episodes has been carried out. During the episodes, 72 h back trajectories have been computed, and information provided on temperature, humidity, cloud cover and inversion height. The trajectories, determined at different altitudes for five receptor locations [Soltau, Freiburg (FRG), De Bilt (Netherlands), Soissons, Nancy (France)] in Europe, show a predominance for advection from eastern to western Europe. For the two more northerly European locations [Soltau (FRG) and de Bilt (the NL)], the air trajectories also pass over less densely populated or maritime regions. Ozone concentrations recorded at a station in the Netherlands, are examined in relation to the direction of the arriving air mass.
Abstract
A climatological study has been carried out of the occurrence and properties of a large number of dry and sunny spells in recent summers (1976–83). The frequency of the spells, which are very favorable for atmospheric photochemical activity, were found to be significantly higher in the investigated period than in previous years. A detailed examination of 25 episodes has been carried out. During the episodes, 72 h back trajectories have been computed, and information provided on temperature, humidity, cloud cover and inversion height. The trajectories, determined at different altitudes for five receptor locations [Soltau, Freiburg (FRG), De Bilt (Netherlands), Soissons, Nancy (France)] in Europe, show a predominance for advection from eastern to western Europe. For the two more northerly European locations [Soltau (FRG) and de Bilt (the NL)], the air trajectories also pass over less densely populated or maritime regions. Ozone concentrations recorded at a station in the Netherlands, are examined in relation to the direction of the arriving air mass.
