摘要
为了解华东森林及高山背景区域大气中PM10和PM2.5质量浓度的变化特征,选取国家大气背景监测福建武夷山站2011年3月～2012年2月PM10、PM2.5为期1 a的监测数据,研究其浓度变化特征及其影响因子,并利用后向轨迹模式探讨区域输送对背景区域PM10和PM2.5质量浓度的影响.结果表明:华东森林及高山区域现阶段PM10和PM2.5背景浓度分别为(23±16)μg·m-3和(18±12)μg·m-3;PM10和PM2.5浓度具有相同的季节变化特征,即春季>秋季>冬季>夏季,2011年春季武夷山背景点因受沙尘远距离输送影响,PM10和PM2.5浓度明显高于其它三季;武夷山背景地区主要以细粒子为主,PM2.5/PM10年平均比值为0.76;PM10和PM2.5浓度与气体污染物均有较好的相关性,表明PM10和PM2.5可能来源于区域人为污染源的输送和二次粒子转化;2011年4月的污染事件与北方沙尘输送有关,而9月的污染事件主要与华东高污染负荷区的污染物输送有关.
The online PM10 and PM2.5concentrations were measured from March 2011 to February 2012 at the national atmospheric background monitoring station in Wuyishan of Fujian Province to discuss the characteristic of PM10 and PM2.5 concentrations and the impact factors in forest and mountain background region of East China.HYSPLIT（Hybrid Single Particle Lagrangian Integrated Trajectory） Model was used to investigate the potential sources of particulates during the pollution episodes.The results showed that the background concentrations of PM10 and PM2.5 were（23±16） μg·m-3 and（18±12） μg·m-3,respectively.Seasonal variations of PM10 and PM2.5 loadings were observed,and loadings decreased in the same order： springautumnwintersummer.PM10 and PM2.5 concentrations were obviously higher in spring than in other seasons because of the transportation of dust storm.The fine particles were the dominant pollutant which accounted for 76% of PM10.The good correlation between PM10/PM2.5 and gas pollutants suggested that regional transportation and secondary aerosol were the major sources in the background station.One episode occurring in April 2011 was related with the transportation of dust storm.However,another episode occurring in September 2011 had close relationship with the transportation of higher pollutant loadings in East China.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第2期455-461,共7页
Environmental Science
基金
2008年中央财政主要污染物减排专项
环境保护公益性行业科研专项(200709054)
关键词
高山背景站
颗粒物
气体污染物
沙尘
区域输送
high mountain background site
particle
gas pollutants
dust storm
regional transportation
