We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Variational regional inverse modeling of reactive species emissions with PYVAR-CHIMERE-v2019.
- Authors
Fortems-Cheiney, Audrey; Pison, Isabelle; Broquet, Grégoire; Dufour, Gaëlle; Berchet, Antoine; Potier, Elise; Coman, Adriana; Siour, Guillaume; Costantino, Lorenzo
- Abstract
Up-to-date and accurate emission inventories for air pollutants are essential for understanding their role in the formation of tropospheric ozone and particulate matter at various temporal scales, for anticipating pollution peaks and for identifying the key drivers that could help mitigate their concentrations. This paper describes the Bayesian variational inverse system PYVAR-CHIMERE, which is now adapted to the inversion of reactive species. Complementarily with bottom-up inventories, this system aims at updating and improving the knowledge on the high spatiotemporal variability of emissions of air pollutants and their precursors. The system is designed to use any type of observations, such as satellite observations or surface station measurements. The potential of PYVAR-CHIMERE is illustrated with inversions of both carbon monoxide (CO) and nitrogen oxides (NO x) emissions in Europe, using the MOPITT and OMI satellite observations, respectively. In these cases, local increments on CO emissions can reach more than + 50 %, with increases located mainly over central and eastern Europe, except in the south of Poland, and decreases located over Spain and Portugal. The illustrative cases for NO x emissions also lead to large local increments (> 50 %), for example over industrial areas (e.g., over the Po Valley) and over the Netherlands. The good behavior of the inversion is shown through statistics on the concentrations: the mean bias, RMSE, standard deviation, and correlation between the simulated and observed concentrations. For CO, the mean bias is reduced by about 27 % when using the posterior emissions, the RMSE and the standard deviation are reduced by about 50 %, and the correlation is strongly improved (0.74 when using the posterior emissions against 0.02); for NO x , the mean bias is reduced by about 24 % and the RMSE and the standard deviation are reduced by about 7 %, but the correlation is not improved. We reported strong non-linear relationships between NO x emissions and satellite NO 2 columns, now requiring a fully comprehensive scientific study.
- Subjects
TROPOSPHERIC ozone; EMISSIONS (Air pollution); AIR pollutants; EMISSION inventories; CARBON monoxide; PARTICULATE matter; STANDARD deviations; NITROGEN oxides
- Publication
Geoscientific Model Development, 2021, Vol 14, Issue 5, p2939
- ISSN
1991-959X
- Publication type
Article
- DOI
10.5194/gmd-14-2939-2021