CONVERSION RATES OF SURFACE HOX RADICALS IN BEIJING CITY  

作　　者：RENXin-rong WANGLi-xin WANGHui-xiang MIAOGuo-fang 

机构地区：[1]StateKeyLaboratoryofEnvironmentalSimulationandPollutionControl,CollegeofEnvironmentalSciences,PekingUniversity,Beijing100871,P.R.China

出　　处：《Chinese Geographical Science》2004年第1期34-38,共5页中国地理科学（英文版）

基　　金：Under the auspices of the National Natural Science Foundation of China(No.40075026)

摘　　要：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, similar to 80x10(6)OH/cm(3) in summer and similar to 20x10(6)-40x10(6)OH/cm(3) in fall. On the basis of measured data, the reaction rates related to the photochemical process of HO(x) (OH+HO(2)) were derived and characteristics of atmospheric chemical processes in the city were analyzed. The results showed that conversion rates of atmospheric OH and HO(2) in the summer of Beijing City were about 700x10(6) molecule/(cm(3) . s) and 600x10(6)molecule/(cm(3) . s), respectively. And the net production of OH in the air of the city mainly originated from the photolysis of the gaseous HNO(2), and the main sink of OH were the photochemical reactions with VOCs, NO(2), HCHO and CO. It was different from the clean area.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 air of the city mainly originated 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.

关 键 词：surface HO(x) radical conversion rate atmospheric photochemistry city atmospheric environment 

分 类 号：P402[天文地球—大气物理学与大气环境]