Photochemical regimes in urban atmospheres: The influence of dispersion

Details Photochemical regimes in urban atmospheres: The influence of dispersion Photochemical regimes in urban atmospheres: The influence of dispersion

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.1895h&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 13, p. 1895-1898

Mathematics

Logic

3

Atmospheric Composition And Structure: Pollution-Urban And Regional

Scientific paper

The dependence on emissions of urban photochemistry is studied under meterological conditions favouring pollution episodes. We use a simple chemistry-transport model, yet realistic with respect to the main chemical and physical processes and considering the diurnal cycle of forcing parameters. For a range of NOx emissions, the diurnal equilibria of the system are searched for. It is shown that, if the photochemistry over a large city mostly exhibits a negative sensitivity to NOx emissions, there are meteorological situations under which it becomes (positively) NOx sensitive, the dispersion time scale being a key parameter. We show that, under specific conditions, the urban atmosphere might reach two very different diurnal equilibria. We demonstrate that the sensitivity to NOx emissions evolves with time: under specific conditions, the urban atmosphere becomes NOx sensitive within two days.

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