Open AccessInverse modeling of surface NO x anthropogenic emission fluxes in the Paris area during the Air Pollution Over Paris Region (ESQUIF) campaign
Author(s) -
Pison Isabelle,
Menut Laurent,
Bergametti Gilles
Publication year - 2007
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2007jd008871
Subject(s) - environmental science , atmospheric sciences , ozone , emission inventory , meteorology , air pollution , pollution , air quality index , climatology , geography , physics , geology , chemistry , ecology , organic chemistry , biology
An inverse modeling approach has been developed to optimize urban NO x emission fluxes. We used the chemistry‐transport model CHIMERE and its adjoint to develop a new methodology that includes kriging of measurements and a dynamic spatial aggregation model taking into account surface morphology of emission fluxes and ozone plumes to determine areas where emissions are inverted. This method is first applied to a seasonal approach over the Paris area. All emission fluxes were inverted hourly for the months of July and August of years 1998 and 1999. This leads to a significant reduction of the differences between simulated and measured concentrations of ozone and NO x . The results suggest that in the first‐guess inventory, NO x fluxes are overestimated in the city of Paris and underestimated in the suburban areas. For the two periods the differences between optimized and first‐guess profiles are about 15%. Comparisons between time profiles showed that Mondays and Wednesdays in August had characteristics that made them differ from the other days of the week. Two intensive observation periods of the Air Pollution Over Paris Region (ESQUIF) campaign are focused on and hourly results are discussed in order to refine the climatological results.