1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2. Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China;
3. Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction, China Meteorological Administration, Guangzhou 510080, China
Terrestrial ecosystems are not only the major sink for ozone, but also a critical control of surface-level ozone budget. However, due to its deleterious effects, plant functioning is affected by the ozone absorbed. It is thus very necessary to predict total ozone deposition to ecosystems and partition the different deposition pathways (stomatal pathway and non-stomatal pathway). Based on observations of the ozone dry deposition of winter wheat and bare-soil field in Nanjing by the eddy-correlation system, the Surfatm-O3 dry deposition model were added in order to modify and validate parameters of the leaf stomatal resistance (Rsleaf), soil resistance (Rsoil) and cuticular resistance (Rcut). Then the simulations of the total ozone flux (FO3) of main growth stages in Winter Wheat, dry deposition velocity (Vd) and their distributions of different deposition pathways were carried out, and the impacts of chemical reactions between NO from the soil and ozone on the ozone dry deposition process were also analyzed indirectly. The results showed the simulations and measurements of FO3 and Vd had the similar trend, and the average values of measured Vd and modelled Vd were 0.39 and 0.37cm/s, respectively. Compared with measurements, the simulations underestimated by 5.3%. The average non-stomatal deposition pathway (cuticular deposition and soil deposition) is the main pathway of ozone dry deposition, accounting for 68.8% of the total ozone flux, in which cuticular deposition was accounted for 46.7% of non-stomatal deposition. The average green and yellow leaf stomatal deposition accounted for 28.6% and 2.6% of the total ozone flux respectively. During the daytime, the proportion of non-stomatal deposition decreased to 58.8%, and the ratios of green and yellow leaf stomatal deposition increased, accounting for 37.7% and 3.5% of the total ozone flux, respectively. During the nighttime, cuticular deposition and soil deposition accounted for 64.3% and 35.7% of total ozone flux, respectively. The soil NO emission affected the dry ozone deposition process by ozone chemical reaction, which should be considered in the future ozone dry deposition model.
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