亚洲精品综合日韩中文字幕网站_精品综合久久久久97_中文在线天堂网www_久久精品免费一区二区三区_91久久国产综合精品女同国语_久久资源总站在线国产成人

瑞士萬(wàn)通中國(guó)有限公司

上海世博會(huì)期間都市氣溶膠特性研究

時(shí)間:2014-5-7 閱讀:6146
分享:

Urban Aerosol Characteristics during the World Expo 2010 in Shanghai

2010年上海世博會(huì)期間都市氣溶膠特性研究

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.

 

會(huì)員登錄

×

請(qǐng)輸入賬號(hào)

請(qǐng)輸入密碼

=

請(qǐng)輸驗(yàn)證碼

收藏該商鋪

X
該信息已收藏!
標(biāo)簽:
保存成功

(空格分隔,最多3個(gè),單個(gè)標(biāo)簽最多10個(gè)字符)

常用:

提示

X
您的留言已提交成功!我們將在第一時(shí)間回復(fù)您~
撥打電話 產(chǎn)品分類(lèi)
在線留言
太仓市| 敦化市| 陆河县| 镇雄县| 高要市| 同德县| 宣威市| 大邑县| 潼关县| 电白县| 岳阳县| 渑池县| 桐柏县| 屯留县| 怀柔区| 黄大仙区| 云和县| 台北市| 西丰县| 多伦县| 邹平县| 运城市| 宿迁市| 新晃| 安阳县| 永泰县| 义乌市| 都兰县| 德保县| 繁峙县| 安溪县| 布尔津县| 常州市| 广西| 兴仁县| 江孜县| 广灵县| 榆树市| 张家港市| 延津县| 博湖县|