Influence of dynamic ozone dry deposition on ozone pollution

O. E Clifton (1, 2, 3) , F. Paulot (4, 5) , A. M Fiore (1, 2) , L. Horowitz (5) , G. Correa (2) , C. B Baublitz (1, 2) , S. Fares (6) , I. Goded (7) , A. H Goldstein (8) , C. Gruening (9) , A. J Hogg (10) , Benjamin Loubet (11) , I. Mammarella (12) , J. W Munger (13) , L. Neil (14) , Patrick Stella (15) , J. Uddling (16) , T. Vesala (12) , E. Weng (17, 18)

1 Department of Earth and Environmental Sciences [New York]
2 LDEO - Lamont-Doherty Earth Observatory
3 NCAR - National Center for Atmospheric Research [Boulder]
4 GFDL - NOAA Geophysical Fluid Dynamics Laboratory
5 AOS Program - Atmospheric and Oceanic Sciences Program [Princeton]
6 CREA - Consiglio per la Ricerca in Agricoltura e l’analisi dell’economia agraria = Council for Agricultural Research and Economics
7 JRC - European Commission - Joint Research Centre [Ispra]
8 ESPM - Department of Environmental Science, Policy, and Management [Berkeley]
9 IES - JRC Institute for Environment and Sustainability
10 University of Michigan System
11 ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes
12 Helsingin yliopisto = Helsingfors universitet = University of Helsinki
13 SEAS - Harvard John A. Paulson School of Engineering and Applied Sciences
14 Hemmera, Ausenco
15 SADAPT - Sciences pour l'Action et le Développement : Activités, Produits, Territoires
16 Department of Biological and Environmental Sciences [Gothenburg]
17 CCSR - Center for Climate Systems Research [New York]
18 GISS - NASA Goddard Institute for Space Studies

Black carbon (BC) is a major light absorption material that acts as a climate change driver with high radiative forcing and as an air pollutant that reduces visibility and air quality. Thus, reducing the emission and ambient concentration of BC could help address climate change and improve air quality simultaneously. In this study, the mass concentration of atmospheric BC was continuously measured by an aethalometer in Shanghai in 2017. The annual BC concentration was 2.19 ± 1.28 μg/m3, with the highest loading in winter and the lowest loading in autumn. The BC concentrations varied with year and location when compared with previous studies in different locations in Shanghai. The hourly BC concentration had a bimodal distribution, with two peaks during the morning and evening traffic rush hours. Liquid fuels, biomass, and coal combustion contributed 65.7%, 21.5%, and 12.8%, respectively, of the total BC based on the advanced aethalometer model. The three sources varied in different seasons with a high contribution of liquid source in summer and more coal and biomass emissions in winter. High BC concentrations accumulated in the stable weather conditions in the four seasons and appeared when there were high wind speeds from the northwestern direction in winter. The Yangtze River Delta region was the most likely potential source region of high BC loading in the four seasons, and long‐range transport from North China in winter was another likely source region based on the results of cluster analysis and potential source contribution function analysis of backward trajectories.

Mots clés: dry deposition; tropospheric ozone; stomatal conductance; earth system modeling; nonstomatal deposition; air pollution

Domaines: Sciences de l'environnement; Milieux et Changements globaux

O. E Clifton, F. Paulot, A. M Fiore, L. Horowitz, G. Correa, et al.. Influence of dynamic ozone dry deposition on ozone pollution. Journal of Geophysical Research: Atmospheres, 2020, 125 (8), ⟨10.1029/2020JD032398⟩. ⟨hal-02564838⟩