青海瓦里关地面臭氧浓度的变化特征

The variation characteristics of surface ozone concentration at Waliguan in Qinghai

为探讨地面O3生成和变化机制,利用青海省瓦里关大气本底基准观象台1994～2002年的地面O3连续观测资料,结合同期瓦里关CO数据及3个相近高海拔全球背景站点Mauna Loa,Jungfraujoch,Izan的O3和CO资料,对瓦里关地面O3变化特征进行分析.结果表明,瓦里关地面O3浓度有逐年缓慢增加的趋势,存在明显的季节变化,O3最高值出现在夏季,而其他3个站点最高值出现在春季.与Izana站相似,瓦里关地面O3的日变化幅度较小,日最小值出现在中午时分,最大值出现在晚上和凌晨.瓦里关地面O3和CO存在一定的相关性,但相关性不显著.

To explore the mechanisms responsible for formation and variation of O3 at the surface, the variation characteristics of the surface O3 over Waliguan had been analyzed based on near eight years of continuous observations of surface O3 at Waliguan atmospheric baseline observatory from 1994 to 2002, combined with the Waliguan CO data and O3 and CO data of other three near high elevation globe background stations, Manna Loa, Jungfraujoch and Izana in the same period. The surface concentration of O3 at Waliguan had the tendency of increasing slowly year by year, and had exhibited obvious seasonal variation, with the maximum O3 appearing in summer, while the highest values of the other three stations appeared in spring. Similar with Izafia station, the daily difference range of Waliguan surface concentration of O3 was relatively small, with the daily minimum appearing at noon and the maximum at night and early morning. The surface concentrations of O3 correlated to some extent with the concentration of CO at Waliguan, but the correlation was not marked.