摘要
基于2010-2012年西安市13个空气自动监测站逐日的监测数据,分析空气污染指数的日、月、季度、年际、采暖期和非采暖期变化,并与秦皇岛等北方城市对比,用探索性空间分析技术ESDA研究污染指数的空间自相关和集聚效应.结果表明：空气污染指数的日变化较大,PM10是西安市区的首要污染物;1月、12月污染指数较大,7月、8月较小;空气污染指数表现为4季度＞1、3季度＞2季度;3年来,PM10污染指数有所降低,主城区SO2、NO2污染指数降低,其他地区增加;采暖期污染指数高于非采暖期,采暖期SO2、NO2和PM10指数分别是非采暖期的2.01～2.75、1.42 ～ 1.82和1.18 ～1.36倍;西安市区空气污染指数有弱的正空间自相关,聚集方式以高高（HH）和低低（LL）聚集为主,低高（LH）和高低（HL）聚集为辅,污染指数高低分化.污染指数均表现为中部高,北部低,南部中等.不同污染物污染指数中心的重叠表明,西安市空气质量受SO2、NO2和PM10的共同影响.
Based on the daily monitoring data from 13 automatic air monitoring stations during the period of 2010 to 2012 in Xi＇an,we analyzed daily,monthly,quarterly,and yearly air pollution indexes in heating and non-heating periods,compared with those in northern cities like Qinhuangdao,and used an exploratory spatial analysis technique ESDA to study spatial autocorrelation and agglomeration effects of air pollution index in Xi＇an.The results showed that,there was a high diurnal variation of air pollution index,and PM10 was the primary pollutant in Xi＇an.The air pollution index was larger in January and December,while it was lower in July and August.PM10 index decreased generally to a certain extent over the past three years.The SO2 and NO2 indexes declined in the urban area but increased in other regions.SO2,NO2,and PM10 indexes during the heating period were higher than in non-heating period by 2.01-2.75,1.42-1.82,1.18-1.36 times,respectively.The pollution index was high downtown,low in the north,and medium in the south.The air pollution index had a positive spatial correlation,but the spatial correlation was weak.High-high aggregation （HH） and low-low aggregation （LL） were more than low-high aggregation （LH） and high-low aggregation （HL）,and differentiation in the level of pollution index occurred.Coincidence of peak values of pollutant indexes suggests that the air quality in Xi＇an was jointly affected by SO2,NO2 and PM10.
出处
《中国水土保持科学》
CSCD
2014年第3期9-16,共8页
Science of Soil and Water Conservation
基金
国家林业公益性行业科研专项"森林对PM2.5等颗粒物的调控功能与技术研究"(20130430104)
关键词
空气污染指数
ESDA
时空分布
西安
air pollution index
ESDA
temporal and spatial distribution
Xi＇an
