Seasonal contrasts in modelled and observed dry deposition velocities of O3, SO2 and NO2 over three surfaces |
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| Institution: | 1. College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;2. Institute of Ecology, College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China;3. Ji County Station, Chinese National Ecosystem Research Network (CNERN), Beijing 100083, China;4. Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;5. Beijing Engineering Research Center of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;6. Engineering Research Center of Forestry Ecological Engineering, Ministry of Education, Beijing Forestry University, Beijing 100083, China;7. Beijing Collaborative Innovation Center for Eco-Environmental Improvement With Forestry and Fruit Trees, 102206 Beijing, China;8. Beijing Water Consulting Co., LTD, 100048 Beijing, China;1. Estación Costera de Investigaciones Marinas & Center for Marine Conservation, Pontificia Universidad Católica de Chile, Santiago, Chile.;2. Interdisciplinary Center for Aquaculture Research (INCAR), Universidad de Concepción, Chile;3. Department of Zoology (now Integrative Biology), Oregon State University, Corvallis, Oregon;4. California Sea Grant Extension, Eureka, California, United States;5. Departamento de Oceanografía & COPAS Sur-Austral, Universidad de Concepción, Concepción, Chile;6. Centre for Shellfish Research, Vancouver Island University, Nanaimo, British Columbia, Canada.;7. Center for Applied Ecology and Sustainability, CAPES, P. Universidad Católica de Chile, Santiago, Chile |
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| Abstract: | Results of modelled and observed deposition velocities (Vd) for O3, SO2 and NO2 for time-averaged diurnal cycles and sometimes for a collection of hourly values taken from different days are discussed for different seasons. From the observations, it was found that the O3Vd values over a deciduous forest had a daytime representative value of 1.0 cm s−1 in the summer and 0.3 cm s−1 in the winter. For SO2 over the same forest and over a carrot field the daytime values ranged from 0.0 to 0.65 cm s−1 in the autumn, and for SO2 over a snow surface the Vd ranged from 0.0 to 0.15 cm s−1. The NO2Vd was mostly negative over the forest and the carrot field in the autumn and had a range of 0.0-0.15 cm s−1 over snow. From the model, it was found that for the three seasons the Vd values over all the land-use types were much larger than the observations. The model could not simulate the observed negative values of the NO2Vd. The impact of the Vd model and its modified version on the concentrations of O3 and SO2 were tested with a comprehensive Eulerian air quality model. |
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