Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 15, 9799-9818, 2015
https://doi.org/10.5194/acp-15-9799-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
01 Sep 2015
Evaluating BC and NOx emission inventories for the Paris region from MEGAPOLI aircraft measurements
H. Petetin1, M. Beekmann1, A. Colomb1,2, H. A. C. Denier van der Gon3, J.-C. Dupont4, C. Honoré5, V. Michoud1,a, Y. Morille4, O. Perrussel5, A. Schwarzenboeck2, J. Sciare6, A. Wiedensohler7, and Q. J. Zhang1,b 1LISA/IPSL, Laboratoire Interuniversitaire des Systèmes Atmosphériques, UMR CNRS 7583, Université Paris Est Créteil (UPEC) et Université Paris Diderot (UPD), France
2Laboratoire de Météorologie Physique, Clermont-Ferrand, France
3TNO, Princetonlaan 6, 3584 CB Utrecht, the Netherlands
4Laboratoire de Météorologie Dynamique, Palaiseau, France
5AIRPARIF, Agence de surveillance de la qualité de l'air, Paris, France
6LSCE, Laboratoire des Sciences du Climat et de l'Environnement, CNRS-CEA-UVSQ, Gif-sur-Yvette, France
7Leibniz Institute for Tropospheric Research, Leipzig, Germany
anow at: Mines Douai, SAGE, Douai, France
bnow at: ARIA, Boulogne-Billancourt, France
Abstract. High uncertainties affect black carbon (BC) emissions, and, despite its important impact on air pollution and climate, very few BC emissions evaluations are found in the literature. This paper presents a novel approach, based on airborne measurements across the Paris, France, plume, developed in order to evaluate BC and NOx emissions at the scale of a whole agglomeration. The methodology consists in integrating, for each transect, across the plume observed and simulated concentrations above background. This allows for several error sources (e.g., representativeness, chemistry, plume lateral dispersion) to be minimized in the model used. The procedure is applied with the CHIMERE chemistry-transport model to three inventories – the EMEP inventory and the so-called TNO and TNO-MP inventories – over the month of July 2009. Various systematic uncertainty sources both in the model (e.g., boundary layer height, vertical mixing, deposition) and in observations (e.g., BC nature) are discussed and quantified, notably through sensitivity tests. Large uncertainty values are determined in our results, which limits the usefulness of the method to rather strongly erroneous emission inventories. A statistically significant (but moderate) overestimation is obtained for the TNO BC emissions and the EMEP and TNO-MP NOx emissions, as well as for the BC / NOx emission ratio in TNO-MP. The benefit of the airborne approach is discussed through a comparison with the BC / NOx ratio at a ground site in Paris, which additionally suggests a spatially heterogeneous error in BC emissions over the agglomeration.

Citation: Petetin, H., Beekmann, M., Colomb, A., Denier van der Gon, H. A. C., Dupont, J.-C., Honoré, C., Michoud, V., Morille, Y., Perrussel, O., Schwarzenboeck, A., Sciare, J., Wiedensohler, A., and Zhang, Q. J.: Evaluating BC and NOx emission inventories for the Paris region from MEGAPOLI aircraft measurements, Atmos. Chem. Phys., 15, 9799-9818, https://doi.org/10.5194/acp-15-9799-2015, 2015.
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