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In order to track air masses at regional scale
and to help the choice of aircraft flights, passive conservative tracers are
released in the Meso-NH eulerian model, from La Cape Sud, Biscarosse, Marmande
and Bordeaux. The total quantity of emitted gas is arbitrarily fixed to 1 ton
(1000kg), released during 3 hours
(between 6 and 9TU) on a 1000m height column above each site. Simulated hourly concentration
(in g.m-3) are plotted at 800m height. Another field, called “Time
integrated plume”, is calculated at time H, corresponding to the time
integrated concentration over sampling duration (from 6TU to H), normalized by
the total quantity of emitted gas. This field, independent of the quantity
released, is commonly used in atmospheric dispersion works (often called
Atmospheric Transfer Coefficient): it supplies an information of the air mass
displacement since the beginning of the release.
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