ON THE USE OF THE SYNOPTIC VERTICAL VELOCITY IN TRAJECTORY MODEL: VALIDATION BY GEOCHEMICAL TRACERS - Laboratoire interuniversitaire des systèmes atmosphériques Accéder directement au contenu
Article Dans Une Revue Atmospheric Environment Année : 1991

ON THE USE OF THE SYNOPTIC VERTICAL VELOCITY IN TRAJECTORY MODEL: VALIDATION BY GEOCHEMICAL TRACERS

Daniel Martin
  • Fonction : Auteur
Bernard Strauss
  • Fonction : Auteur

Résumé

It is well recognized that vertical motions play an important role in long range transport (LRT). The representation of the vertical movements can be obtained by the calculation of isentropic trajectories or by the use of the synoptic vertical wind component {V) to compute three-dimensional (3-D) trajectories. Furthermore, it is easier to compute air mass trajectories using the latter parameter than to compute isentropic ones. This last technique is a very time consuming computer one. On the other hand, the meaning of V, could be questionable by the meteorologist because of its rather poor time and spatial resolutions. The present paper will discuss and validate the use of V: in trajectory models. This validation needs identified meteorological situations leading to characterized vertical motions. We choose the Saharan dust transport from Africa to the Mediterranean region because this situation may well be defined both by the geochemical tracers of dust (AI, Si) and by satellite imagery. Such an experiment has been performed during the period April 1985-April 1986 on Corsica allowing the study of 17 events of dust transport. At first, we show with a meteorological analysis that all these transports are associated to frontal situations. Secondly, we validate the three dimensional trajectory model with horizontal and vertical transport considerations. Horizontal transport and source locations derived from the three-dimensional trajectory model are in very good agreement with lhe satellite observations. The vertical transport, referred to as frontal transport, is determined by comparing the different vertical motions for different final barometric levels. We conclude that, although the isentropic trajectories represent more realistic vertical motions, our model seems to be well adapted to intensive applications in pollution studies.
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Dates et versions

hal-02328225 , version 1 (24-10-2019)

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  • HAL Id : hal-02328225 , version 1

Citer

Daniel Martin, G. Bergametti, Bernard Strauss. ON THE USE OF THE SYNOPTIC VERTICAL VELOCITY IN TRAJECTORY MODEL: VALIDATION BY GEOCHEMICAL TRACERS. Atmospheric Environment, 1991, 24A (8), pp.2059-2069. ⟨hal-02328225⟩
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