长江三角洲地区臭氧生成过程分析

建立了二维空气质量模式模拟长江三角洲地区臭氧体积分数,模拟结果和实测值吻合较好.并以常熟地区为例分析了臭氧生成过程.结果表明:干沉降对大气臭氧有明显的去除作用,平均为2.1 μL/(m3·h);水平输送过程对臭氧的影响和化学臭氧生成速率P(O₃)具有明显的日变化特征;总体来说,水平输送对臭氧有净的去除,平均为1.9 μL/(m3·h);化学生成过程则增加臭氧体积分数,净生成速率为5.3 μL/(m3·h),表明该地区大气有较强的氧化性;计算了该地区的臭氧生成效率,结果表明1分子NO_x从排放到去除期间可以生成7.5分子O₃. 

Process Analysis of Ozone Formation in the Yangtze River Delta

A two-dimension air quality model has been developed to simulate the ozone concentration in the Yangtze River Delta. The simulated ozone concentrations are in general agreement with those of measurement. Process analysis is conducted for ozone formation in the area of Changshu of Jiangsu Province. Results show that dry deposition decreases the daily ozone concentration with a value of averaged 2.1 μL/(m3·h), horizontal transport and chemical production rate of ozone have obviously diurnal variations. However, transport process totally decreases the ozone concentration with a value of averaged 1.9 μL/(m3·h), while the chemical process has a net contribution to ozone formation with a value of averaged 5.3 μL/(m3·h), indicating the high oxidative capacity of regional atmosphere. A chemical production efficiency study was also conducted , the result indicated that each NO_x molecule can produce 7.5 O₃ molecules during its life from emission to removal.