Conversion rates of surface HOx radicals in Beijing City |
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| Authors: | Ren Xin-rong Wang Li-xin Wang Hui-xiang and Miao Guo-fang |
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| Institution: | (1) State Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences, Peking University, 100871 Beijing, P. R. China;(2) Department of Meteorology, Pennsylvania State University, 16802, PA, USA |
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| Abstract: | Surface OH radical concentration in Beijing City was measured by impregnated filter trapping technique-high performance liquid
chromatography (IFT-HPLC). The observed concentration of OH radical showed obvious diurnal and seasonal variations, with maximum
readings at noon or afternoon, ∼80×106OH/cm3 in summer and ∼20×106-40×106OH/cm3 in fall. On the basis of measured data, the reaction rates related to the photochemical process of HOX (OH+HO2) were derived and characteristics of atmospheric chemical processes in the city were analyzed. The results showed that conversion
rates of atmospheric OH and HO2 in the summer of Beijing City were about 700×106 molecule/(cm3·s) and 600×106molecule/(cm3·s), respectively. And the net production of OH in the air of the city mainly originate from the photolysis of the gaseous
HNO2, and the main sink of OH were the photochemical reactions with VOCs, NO2, HCHO and CO. It was different from the clean area.
Foundation item: Under the auspices of the National Natural Science Foundation of China (No. 40075026)
Biography: REN xin-rong (1973 -), male, a native of Zhejiang Province, Ph. D., now a postdoctorship in Pennsylvania State
University, USA, specialized in the reaction kinetics of atmospheric environment. E-mail: ren@essc.psu.edu |
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| Keywords: | surface HOx radical conversion rate atmospheric photochemistry city atmospheric environment |
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