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Lagrangian stochastic dispersion modelling for the simulation of the release of contaminants from tall and low sources

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Abstract:

A Lagrangian particle model is used to study the dispersion of pollutants released in two different tracer experiments: Prairie Grass and Copenhagen. The model is based on a generalized form of the Langevin equation. Turbulence inputs are parameterized according to a scheme able to generate continuous values in all stability conditions and in all heights in the planetary boundary layer. Predicted values of ground-level concentration agree quite well with observed ones. The major progress of this paper is as follows: For air quality modeling it is highly necessary to include a parameterization that allows a correct description of the turbulent transport of contaminants released simultaneously from low and tall sources.

Ein Lagrange'sches Partikelmodell wird bei zwei verschiedenen Tracer-Experimenten zur Untersuchung der Dispersion von Luftschadstoffen verwendet: Pra¨riegrass und Kopenhagen. Das Modell fußt auf einer generalisierten Form der Langevin-Gleichung. Der turbulente Input wird nach einem Prinzip parameterisiert, dass es ermo¨glicht, kontinuierliche Werte fu¨r alle Stabilita¨tsbedingungen und die gesamte Planetare Grenzschicht zu erzeugen. Die vorhergesagten Werte der bodennahen Konzentration stimmen recht gut mit den beobachteten u¨berein. Der große Fortschritt, den diese Arbeit aufzeigt, ist der folgende: Zur Modellierung der Luftqualita¨t ist es in hohem Maße notwendig eine Parameterisierung einzufu¨gen, die eine zutreffende Beschreibung derjenigen turbulenten Transporte der Schadstoffe ermo¨glicht, die gleichzeitig von niedrigen und hohen Quellen freigesetzt werden.

Keywords:

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2002/0011-0089

Publication date: March 1, 2002

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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