【摘要】 利用北京 32 5m气象塔作为高空平台 ,于 1997年 10月观测到一次冷锋过程大气边界层内O3及NOx 体积分数的变化 ,研究了O3及NOx 体积分数与气象要素之间的关系 ,着重讨论了冷锋过境前后O3及NOx 的体积分数变化及其与输送过程的关系。研究表明 :北京大气边界层中下层存在明显的O3体积分数垂直梯度 ,O3的垂直输送与风速及温度梯度密切相关。冷锋过程有利于高层O3向低层输送 ,使O3体积分数垂直梯度明显减小 ,并使NOx 体积分数显著降低。更多还原

【Abstract】 Based on the Beijing 325 m meteorological tower, O 3 and NO x concentrations in urban atmospheric boundary layer were measured from October 22, 1997 to October 31, 1997 during a cold front passage The relations between O 3, NO x and meteorological parameters were studied, and the variations of O 3 and NO x during the passage of cold front were discussed Our results indicate that there is a downward O 3 flux in urban atmospheric boundary layer of Beijing, the vertical transportation of O 3 has a close relation with wind speed and the vertical temperature gradient During the passage of cold front, the vertical gradient of O 3 and NO x concentrations decreased remarkably更多还原