典型沿海城市氯原子大气化学反应数值模拟  

Numerical Simulations on Atmospheric Chemical Reactions of Chlorine in Typical Coastal Cities

作　　者：姚女[1] 刘萍[1] 晏乃强[1] 瞿赞[1] 贾金平[1] 

机构地区：[1]上海交通大学环境科学与工程学院,上海200240

出　　处：《环境科学与技术》2013年第10期18-25,共8页Environmental Science & Technology

基　　金：国家自然科学基金项目(41005077);高等学校博士学科点专项科研基金课题资助(20100073120042)

摘　　要：该研究基于大气化学机理CACM开发了CACM_CL机理来反映含氯物质,并基于CB05CL和CACM_CL机理建立了箱式模型,模拟典型沿海城市含氯物质的化学特征,分析气象因子和其他污染物对含氯物质浓度变化的影响。结果表明:Cl2受气象因子和大气中其他物质的影响较小。Cl浓度有先增后减的趋势,且市区的Cl浓度低于郊区,从而导致市区的ClO、HOCl和HCl的浓度均低于郊区。2个机理对市区Cl的模拟趋势基本一致,CACM_CL模拟的郊区Cl浓度较高,与其机理中活跃的OH有关。温度对Cl、ClO、HOCl和HCl有影响,而气压的影响较小,相对湿度对Cl影响较小,ClO和HClO随相对湿度的增加而增加。其他污染物如O3和NO也会影响含氯物质的浓度,尤其是CACM_CL机理中的Cl浓度。高温、高湿与高NO、O3浓度的复合影响作用明显,会造成HClO和ClO浓度的升高,也会影响CACM_CL模拟的Cl浓度。Atmospheric chemical mechanism considering chlorine chemistry, CACM_CL, was developed based on CACM. The box models were built based on CB05CL and CACM_CL to simulate chlorine chemistry in typical costal cities and the effects of meteorological fields and other pollutants. Results showed that Clz was not affected by meteorological factors and other pollutants, with Cl concentration increased first and then decreased, and relative high concentrations at rural areas led to the lower CIO, HCIO and HCl at urban areas than that at rural areas. Cl was similarly simulated at urban areas by two mech- anisms, but CACM_CL predicted higher Cl at rural areas due to its reactive OH radicals. Temperature could affect Cl, ClO, HOCl and HCl, while the effects of pressure were negligible. Relative humidity showed negligible effects on Cl, while C10 and HCIO increased with increased relative humidity. Other pollutants such as O3and NO could affect chlorines as well, espe- cially for Cl in CACM_CL mechanism. Complex effects of high temperature, high relative humidity and high concentrations of O3 and NO were obvious, which would increase ClO and HClO concentrations and affect Cl concentrations simulated by CACM CL.

关 键 词：氯原子 海盐气溶胶 箱式模型 含氯物质 CACM 

分 类 号：X131.1[环境科学与工程—环境科学]