By Anton Eliassen (auth.), C. De Wispelaere (eds.)
In 1969 the North Atlantic Treaty association confirmed the Committee at the demanding situations of contemporary Society. pollution was once from the beginning one of many pri9rity difficulties less than research in the framework of the pilot reports undertaken by means of this Committee. The association of a each year symposium facing pollution modeling and its software is likely one of the major actions in the pilot learn in terms of pollution. After being geared up for 5 years via the us and for 5 years by means of the Federal Republic of Germany, Belgium, represented by means of the top Minister's place of work for technology coverage Programming, grew to become in charge in 1980 for the association of this symposium. This quantity includes the papers provided on the thirteenth Inter nationwide Technical assembly on pollution Modeling and its Appli cation held at lIe des Embiez, France, from 14th to seventeenth September 1982. This assembly used to be together equipped through the best Minister's workplace for technology coverage Programming, Belgium, and the Ministere de l'Environnement, France. The convention was once attended via one hundred twenty contributors and forty five papers were provided. The remaining ses sion of the thirteenth I. T. M. has been attended by way of Mr. Alain Bombard, French Minister of our surroundings. The participants of the choice committee of the thirteenth I. T. M. have been A. Berger (Chairman, Belgium), W. K1ug (Federal Republic of Germany), ok. Demerjian (United States of America), L. Santomauro (Italy), M. L. Williams (United Kingdom), H. Van Dop (The Netherlands), H. E. Turner (Canada), C.
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Extra info for Air Pollution Modeling and Its Application III
5. I have no good explanation for this situation. W. KLUG Could you please comment on the virtues and drawbacks of Lagrangian versus Eulerian modeling from your point of view ? A. ELIASSEN I think the main virtue of Lagrangian models is that one avoids the numerical problems associated with the advective terms in the Eulerian mass-balance equation. Furthermore, Lagrangian models are economic since one can perform the integration of this equation only along chosen trajectories istead of in a complete Eulerian grid.
O. O. O. o. O. O. o. O• O. O. O• O. O. O. O. 7 O. 0 O. 0 O. 1 O. O o. 1 O. ' o. O. O. O. 0 O. , O. O. 0 O. o. o. O. S O• O. O. O. 0 O. o. O. S O. 0 o. O. O• O. t O. 0 o. 0 27 O. O. 0 o. 4 O. 0 O. O. O. 5 o. 0 D. O. 0 o. 0 DEPOSITIONS MITKIII RECEPTOR lEG 10115 20 22 ZJ 24 zs 26 21 O. 0 O. 5 D. O. 0 O. o. O. o. 0 O. o. S o. 0 o. 0 O. 0 •2 D. 0 o• O. 2 o. 0 21 11 •• o. O. 2 O. J O. 0 O. 7 o. 0 O. O. 0 O. O• O• O. 2 O. J O. 0 O. O• O. O. 1 O. 1 10 Table 1. Example of computed sulfur deposition due to interregional ex-changes of airborne sulfur in January 1977 (Units are KTON Sulfur) • s:: » :- -I :D '"mm :D » r C ::J: III ("') s:: N """ 43 LAGRANGIAN LONG RANGE AIR POLLUTION MODEL NITROGEN CHEMISTRY K = 2 (Day), K = 50 (Night) kn N0 2 ..
L q(n' m) C (n , m) (8 ) (6) 26 F. B. SMITH where A is a large constant representing the source strength. 378 wm' a zero mean, and a shape very similar to the Gaussian distribution without the rather unrealistic "tails" at large w characteristic of the latter distribution. The resulting concentration distribution is very quickly obtained on a computer, and has moments in very close a~reement with analytically-derived moments. Thus the second moment cr is in complete agreement with Taylor's statistical theory result with an expontial correlogram with the same lagrangian time-scale < • cr 2 (T) = 2t"cr 2 ( T +