非甲烷碳氢化合物的光化学臭氧生成潜势的数值模拟研究

Simulation research of photochemical ozone creation potential of NMHC

应用大气光化学模式研究了不同 NMHC/ NOx 比值时 ,各 NMHC物种的光化学臭氧生成潜势指数 ( IPOCP值 )。探讨了在较高 NMHC/ NOx 比值时 ,各 NMHC物种IPOCP值随时间的变化规律。结果表明 :不同结构、种类的 NMHC对光化学臭氧贡献有很大差异 ;各 NMHC物种的 IPOCP值随 NMHC/ NOx 比值、光化学反应的时间尺度变化而系统性地变化。 NOx、烯烃、芳烃和醛类的活性高寿命短 ,输送距离有限 ,主要表现为局地污染 ;烷烃类的活性低寿命长 ,可传输到较远地区。

In context of atmospheric photochemical m o del, the photochemical ozone creation potential (I POCP value) of NMHC species is studied under different NMHC/NO x ratios.And the rule of I POCP values of NMHC changing with time is discussed in the higher NMHC/N O x ratio. The results show that the I POCP values of NMHC species vary with the ratio of NMHC/NO x and time-scale of photochemical reactions sys tematically. NO x、alkenes、aromatics and aldehydes have higher reactivit y and shorter lifespan,so its transportation distance is limited and mainly perf orming local pollution.Alkanes have lower reactivity and longer lifespan,so it c an transport longer distance from its source.