Chemical segregation by heterogeneous emission
AUGER, L. ; LEGRAS, B.
Ozone pollution in the boundary layer results from photoactivated
chemistry of primary pollutants released at the ground. As emissions are<br> highly inhomogeneous in space and time and some chemical time-scales <br>are of the order or larger than dynamical time-scales, it is admitted <br>that turbulent transport and mixing is a key factor in ozone production.<br> We study the interaction between chemistry and convective boundary <br>layer turbulent with a large eddy simulation model coupled to CHIMERE, a<br> detailed chemical model, over a <span class="stixSupport" id="mmlsi40"><span class="inlMMLBox"><span style="cursor:pointer;"><img style="vertical-align:bottom" alt="View the MathML source" title="View the MathML source" src="http://binary-services.sciencedirect.com/content/image/1-s2.0-S1352231006011319-si40.gif" height="13" border="0" width="76"></span></span></span><br> domain. Our results show that when emissions are concentrated over a <br>limited area, strong values of segregation between chemical species are <br>obtained over the first two active hours during the morning, leading to <br>significant impact in terms of pollutants concentration. After 3 h, for <br>each heterogeneous emission case considered, segregation drops to a few <br>percents for most compounds pairs, due to the strong convective mixing <br>of the boundary layer.
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