Modelling The Episodic Pollutants Deposition Over The EMEP 17,6 Cell
Author(s)
J.A. Souto, M.R. Mendez, J.J. Casares, T. Lucas & G.R. Carmichael
Abstract
EMEP 17,6 cell is a 150x150 km2 area located at the Northwest of Spain, that includes several complex features in air pollution dispersion and chemical transformation [l], such as different and complex pollutants sources, and a coastal and complex terrain environment, with changeable weather.
Considering these features, in order to estimate the pollutants' deposition at this location and the relative contribution of the main sources, episodic simulations of the pollutants' transport was done using the Sulphur Transport Eulerian Model 2 (STEM-11) [2], for dry and wet deposition conditions. Emissions were obtained from CORINE AIR and stack measurements (when available). BVOC emissions were considered too.
As the main result, the S and N depositions are increased by the action of the oxidants (such as H2O2, due to the VOCs photochemical mechanisms) in the coastal plumes, over the SO2 (and NOx) from power plants plumes. The increment of S deposition (as sulphate) is around 4 times (respect to the S deposition as SO2, without the VOCs-NOx emissions influence); in the case of N deposition, an additional influence over the coastline was observed [3], so the maximum deposition is located over the Northeastern coast. Therefore, for the management of the S and N deposition in this area, not only SO2 and NOx sources, but also VOCs sources should be considered.
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