【作者】 黄鹤； 孙玫玲； 张长春； 姚青； 樊文燕；

【Author】 HUANG He,SUN Mei-ling,ZHANG Chang-chun, YAO Qing, FAN Wen-yan 1 Tianjin Meteorology Institute, Tianjin 300061, China

【机构】 天津市气象科学研究所；

【摘要】 利用2007年10月10日～2008年9月30日天津边界层气象观测塔得到的PM2.5质量浓度、O3和NO2体积比浓度梯度资料,对比分析了不同高度上各污染物浓度统计特征,并对各污染物浓度的时间变化特征及垂直分布进行了讨论。结果表明:天津市PM2.5污染严重,且易发生光化学污染事件。各层PM2.5浓度在12、1和2月份存在较大差异,其他月份差异较小,O3浓度均表现出夏季高冬季低的典型特征,NO2浓度在220m变化较为复杂且全年波动较大,120m变化平稳,40m则表现出春夏季高,秋冬季低的特点。PM2.5和NO2浓度日变化均呈现双峰型,峰值的出现与早晚出行高峰以及边界层的变化有关,且污染物出现峰值的时间由低到高存在2～3h的延迟。O3浓度与太阳辐射强度关系密切,各层均在正午14时前后达到最大,而夜间的还原反应使各层臭氧浓度下降。40m和120mNO2浓度变化较为一致,全天波动很小,而220m波动较大,昼夜差异明显。更多还原

【Abstract】 Utilizing the vertical data of the main air pollutants(PM2.5, O3 and NO2) obtained on Tianjin 255m meteorological tower from 10, Oct of 2007 to 30, Sept of 2008. The statistical characteristics, temporal variation and vertical distribution of each pollutant on different height were analyzed. The results indicate that, in Tianjin, the major pollution is PM2.5, the photochemical smog pollution is easy to occur due to the higher O3 concentration. There are much more differences of PM2.5 concentration among the three heights (220m, 120m and 40m) in December, January and February, but less in other months. All the O3 concentrations on the three layers are bigger in summer, but smaller in winter. The NO2 concentration changes more complexly and fluctuates obviously on 220m, and relatively stable on 120m, and on 40m, it is bigger in spring and summer, but smaller in autumn and winter. The daily changes of both PM2.5 and NO2 concentrations all have two peaks, for the high trip peak in morning and evening and the variation of boundary layer, specially the times of the peak which appears on each layer sequentially denotes that needs 2～3 hours for the pollutions be transferred from the ground to the top. The O3 concentration has close relationship with the solar radiation intensity and reaches to the maximum at 14:00 almost and decreases on night for the deoxidization reaction on each layer. Both on 40m and 120m, the concentration of NO2 changes similarly and oscillates lowly, but on 220m it fluctuates obviously, and in addition,it is more different between day and night.更多还原