上海世博会期间都市气溶胶特性研究
urban aerosol characteristics during the world expo 2010 in shanghai
2010年上海世博会期间都市气溶胶特性研究
during the world exposition 2010, which ran from may to october, emission control measures were implemented inshanghai and surrounding areas to improve the air quality. this study evaluated the effects of regional transport on aerosolcharacteristics under these controlled local emission conditions using a month’s worth of observations of the aerosol number size distributions (10 nm–10 μm) and the chemical compositions of the aerosols. back-trajectories and a lagrangian dispersion model were combined to analyze the transport characteristics of regional and local air pollution and the related mechanisms. two classes of aerosols were identified and compared. class i was a clear air condition with ocean-oriented air masses. particle counts in this class were dominated by particles in the size range 20–40 nm, and nh4+ was mainly present in the form of (nh4)2so4. a strong peak at noontime indicated that the particle formation or growth process was promoted by the photochemical process. class ii was characterized as a regional transport pollution condition with air masses originating in the surrounding areas. the analysis showed increases in particle number concentrations and total water soluble ions of about 17% and 350%, respectively, compared with class i episodes. the fraction of particles in the size range 50–200 nm increased sharply to almost 50% of the total particle counts. an examination of the diurnal pattern and major water soluble ions suggested that the increase in size mode (50–200 nm) particles was mainly due to the particle growth
process and the presence of enough precursor gases. nh4+ was present in the form of (nh4)2so4 and nh4no3. although air control measures during the world expo significantly limited local emissions, our results indicate that the regional transport from surrounding cities was responsible for the higher trace gases and particle volume concentrations, along with
the large number of aitken mode particles.
导致污水处理设备压滤机压力不足的原因
广州到邛崃航空快递,机场托运,广州到邛崃航空运输
厦门到萨尔布吕肯国际搬家货运_厦门到萨尔布吕肯搬家公司
法兰球阀产品特征
力士乐比例减压阀DRE和DREE系列功能区别
上海世博会期间都市气溶胶特性研究
专为小区疫情防控设计的封闭围挡围栏栅栏参考
圆形振动筛表面物料异常流动的原因和处理方法
FBD971F电动防爆四氟碟阀执行参数及性能规范
怎样能让液压联合冲剪机不再那么吵
东莞到温哥华物流专线,东莞到温哥华国际货运专线
厦门到兰州中川机场专线物流[全境派送]_厦门到中川机场物流货运公司
该如何了解厂家使用的离心风机好坏
芜湖到佛山航空托运宠物_芜湖到佛山空运宠物全程呵护
微粉碎机出粉量变低？多从这几个方面找原因
镇江到成都双流机场物流专线直达_优质镇江到双流机场物流公司
上海搬家到民丰县,上海到民丰县搬家公司,包车长途搬家
常州国际物流到爱丁堡的货代_常州到爱丁堡物流货代
解析电动阀技术原理
重庆到利兹物流专线,重庆到利兹国际货运专线
2010年上海世博会期间都市气溶胶特性研究
during the world exposition 2010, which ran from may to october, emission control measures were implemented inshanghai and surrounding areas to improve the air quality. this study evaluated the effects of regional transport on aerosolcharacteristics under these controlled local emission conditions using a month’s worth of observations of the aerosol number size distributions (10 nm–10 μm) and the chemical compositions of the aerosols. back-trajectories and a lagrangian dispersion model were combined to analyze the transport characteristics of regional and local air pollution and the related mechanisms. two classes of aerosols were identified and compared. class i was a clear air condition with ocean-oriented air masses. particle counts in this class were dominated by particles in the size range 20–40 nm, and nh4+ was mainly present in the form of (nh4)2so4. a strong peak at noontime indicated that the particle formation or growth process was promoted by the photochemical process. class ii was characterized as a regional transport pollution condition with air masses originating in the surrounding areas. the analysis showed increases in particle number concentrations and total water soluble ions of about 17% and 350%, respectively, compared with class i episodes. the fraction of particles in the size range 50–200 nm increased sharply to almost 50% of the total particle counts. an examination of the diurnal pattern and major water soluble ions suggested that the increase in size mode (50–200 nm) particles was mainly due to the particle growth
process and the presence of enough precursor gases. nh4+ was present in the form of (nh4)2so4 and nh4no3. although air control measures during the world expo significantly limited local emissions, our results indicate that the regional transport from surrounding cities was responsible for the higher trace gases and particle volume concentrations, along with
the large number of aitken mode particles.
导致污水处理设备压滤机压力不足的原因
广州到邛崃航空快递,机场托运,广州到邛崃航空运输
厦门到萨尔布吕肯国际搬家货运_厦门到萨尔布吕肯搬家公司
法兰球阀产品特征
力士乐比例减压阀DRE和DREE系列功能区别
上海世博会期间都市气溶胶特性研究
专为小区疫情防控设计的封闭围挡围栏栅栏参考
圆形振动筛表面物料异常流动的原因和处理方法
FBD971F电动防爆四氟碟阀执行参数及性能规范
怎样能让液压联合冲剪机不再那么吵
东莞到温哥华物流专线,东莞到温哥华国际货运专线
厦门到兰州中川机场专线物流[全境派送]_厦门到中川机场物流货运公司
该如何了解厂家使用的离心风机好坏
芜湖到佛山航空托运宠物_芜湖到佛山空运宠物全程呵护
微粉碎机出粉量变低？多从这几个方面找原因
镇江到成都双流机场物流专线直达_优质镇江到双流机场物流公司
上海搬家到民丰县,上海到民丰县搬家公司,包车长途搬家
常州国际物流到爱丁堡的货代_常州到爱丁堡物流货代
解析电动阀技术原理
重庆到利兹物流专线,重庆到利兹国际货运专线