青海湖区域背景点夏季大气NO_2,SO_2和O_3浓度变化规律  

The variations of NO_2,SO_2 and O_3 at an atmospheric background site in Qinghai Lake in summer,northeastern Tibetan Plateau

作　　者：赵竹子[1,2] 曹军骥[1,3] 刘随心[1] 

机构地区：[1]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710075 [2]中国科学院研究生院,北京100049 [3]西安交通大学全球环境变化研究院,西安710049

出　　处：《地球环境学报》2010年第3期201-207,共7页Journal of Earth Environment

基　　金：国家科技支撑计划(2007BAC30B01)

摘　　要：利用ECOTECH公司系列气体监测仪,对青海湖区域背景点夏季的大气污染物的变化规律及其和气象因素之间的关系进行了分析。结果表明,夏季三种气体中NO_2浓度较低,平均值为2.30×10^(-9),其日内变化呈现单峰形式,目较差非常小;SO_2浓度较高,平均值达到20.82×10^(-9),波幅变化较大,其日内变化表现的较不规则;O_3浓度夏季平均值高达57.63×10^(-9),日变化呈现单谷形态,早晨7:00—8:00达到最低值;三种污染物均在凌晨或午夜达到高值。和气象因子的相关分析表明,NO_2静风情况下浓度较低,主要污染源为西北及东北方向的公路及铁路机动车排放;SO_2主要来源于当地生物质燃烧排放,同时东南风向时其浓度增高;静风时O_3浓度最高,其受风向影响较小。ECOTECH EC series air analyzers were used to continuously monitor SO2, NO2 and O3 at Qinghai Lake regional background monitoring station （36°58′37″N, 99°53′56″） from July 4th to August 3 l th, 2010. The variations of NO2, SO2, and 03 concentrations and the relationships between pollutant concentrations and meteorological factors were discussed in this paper. The average concentration of NO2 were very low, the diurnal variation of NO2 showed one peak and the daily difference range of NO2 was relatively small. However, SO2 was about 20.82x10-9 in summer in Qinghai Lake, and the diurnal variation of SO2 was not regular. O3 concentration was high （average 57.63× 10-9） in summer at monitoring site. The diurnal variation of O3 concentration was remarkable with the minimum around 7：00--8：00. The highest concentrations of NO2, 5O2 and O3 all appeared at night and early morning. Correlations between NO2, SO2, O3 concentrations and meteorological factors indicated that NO2 was very low when the calm wind condition occurred and obviously high when northwest and northeast winds prevailed. The pollutant concentrations largely influenced by the vehicle emission from the highway and railway. SO2 was mostly influenced by the biomass-burning emission sources around the measurement site and the concentration was higher when the wind direction was southeast. The concentration of O3 was highest when the wind was calm.

关 键 词：二氧化氮 二氧化硫 臭氧 变化特征 背景点 

分 类 号：X511[环境科学与工程—环境工程]