摘要
为研究城市大气污染持续过程的形成机制及区域输送问题,利用2002年西安市环境监测站SO2、NO2和PM10日平均污染物浓度资料分析了西安市大气污染的时空分布特征及其与气象条件的关系.分析结果表明:一年中西安出现3天以上空气质量为3级以上的持续污染过程18次,累计污染超标日为192天,出现3级以上的概率为53%.西安市区的污染物以可吸入颗粒物为主,PM10污染超标日较多.重点分析了2002年1月9～12日造成西安市持续污染过程的气象条件及天气形势,可见4天的气象条件有着共同的特点:平均风速小,气温较低,出现逆温,相对湿度较大.西安地处高压后部,气压较低,高空为较平直的西北气流,天气形势持续稳定.
The paper is the first part to investigate the mechanism of urban air pollution persistence. From the analysis of the observed data on major polluants (NO_2,SO_2,PM10) in Xi'an Shaanxi;province in 2002,the temporal and spatial characteristics of air pollution and their related meteorology are discussed. The results indicate: the total occurrence frequency of urban air pollution persistence , which is defined as the situation where air quality is equal to or higher than class III lasts more than three days, is 18. the accumulated days when PM10 exceeds the standard point add up to 192 and the probability of Grade 3 upwards is 53 percent in 2002 . The major air pollutant is PM10 and its exceeding standard point days is very many in Xi'an city. The emphasis on analyzing the meteorology condition and weather situation on the consecutive pollution process on January 9—12, 2002 in Xi'an, weather characters are mainly the following: there are the same meteorology characters that the wind speed is slow and air temperature is low and relative humidity is large in the four days in the surface, the back of high pressure system in the surface and the northwestward air current in the back of East Asia air trough in 500 hPa upper air.
出处
《气候与环境研究》
CSCD
北大核心
2005年第1期124-131,共8页
Climatic and Environmental Research
基金
中国科学院大气物理研究所创新基金8 0321
中科院百人计划项目
关键词
空气质量
持续污染
天气形势
air quality, persistent pollution, weather situation
