...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmospheric chemistry and physics >Variation of particle number size distributions and chemical compositions at the urban and downwind regional sites in the Pearl River Delta during summertime pollution episodes
【24h】

Variation of particle number size distributions and chemical compositions at the urban and downwind regional sites in the Pearl River Delta during summertime pollution episodes

机译：夏季污染事件期间珠江三角洲城市和顺风区域站点的颗粒数大小分布和化学成分的变化

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In order to characterize the features of particulate pollution in the PearlRiver Delta (PRD) in the summer, continuous measurements of particle numbersize distributions and chemical compositions were simultaneously performedat Guangzhou urban site (GZ) and Back-garden downwind regional site (BG) inJuly 2006. Particle number concentration from 20 nm to 10 μm at BG was(1.7±0.8)×104 cm?3, about 40% lower than that atGZ, (2.9±1.1)×104 cm?3. The total particle volumeconcentration at BG was 94±34 μm3 cm?3, similar to thatat GZ, 96±43 μm3 cm?3. More 20–100 nm particles,significantly affected by the traffic emissions, were observed at GZ, while100–660 nm particle number concentrations were similar at both sites as theyare more regional. PM2.5 values were similar at GZ (69±43 μg m?3)and BG (69±58 μg m?3) with R2 of 0.71 for thedaily average PM2.5 at these two sites, indicating the fine particulatepollution in the PRD region to be regional. Two kinds of pollution episodes,the accumulation pollution episode and the regional transport pollutionepisode, were observed. Fine particles over 100 nm dominated both number andvolume concentrations of total particles during the late periods of thesepollution episodes. Accumulation and secondary transformation are the mainreasons for the nighttime accumulation pollution episode. SO42−,NO3− accounted for about 60% in 100–660 nmparticle mass and PM2.5 increase. When south or southeast windprevailed in the PRD region, regional transport of pollutants took place.Regional transport contributed about 30% to fine particulate pollution atBG during a regional transport case. Secondary transformation played animportant role during regional transport, causing higher increase rates ofsecondary ions in PM1.0 than other species and shifting the peaks ofsulfate and ammonium mass size distributions to larger sizes.SO42−, NO3−, and NH4+ accounted for about70% and 40% of PM1.0 and PM2.5, respectively.
机译：为了表征夏季珠江三角洲（PRD）的颗粒物污染特征，于2006年7月在广州市区（GZ）和逆风顺风地区（BG）同时连续测量了颗粒数大小分布和化学成分。BG处从20 nm到10μm的粒子数浓度为（1.7±0.8）×10 4 cm ？3 ，比GZ时低约40％，（2.9± 1.1）×10 4 cm ？3 。 BG的总颗粒体积浓度为94±34μm 3 cm ？3 ，与GZ相似，为96±43μm 3 cm ？3 。在广州，观察到更多的20–100 nm颗粒受到交通排放的显着影响，而两个站点的100–660 nm颗粒数浓度相似，因为它们的区域性更大。 GZ（69±43μgm ？3 ）和BG（69±58μgm ？3 ）的PM 2.5 值相似，<这两个站点的每日平均PM 2.5 的i> R 2 为0.71，表明珠三角地区的细颗粒物污染是区域性的。观测到两种污染事件，即累积污染事件和区域交通污染事件。在这些污染事件的后期，超过100 nm的细颗粒控制着总颗粒的数量和体积浓度。积累和二次转化是夜间积累污染事件的主要原因。 SO 4 2 − ，NO 3 − 约占100-660 nm粒子质量的60％，PM < sub> 2.5 增加。当珠三角地区出现南风或东南风时，发生了污染物的区域运输，在区域运输案例中，区域运输占BG细颗粒物污染的30％。二次转化在区域运输中起着重要作用，导致PM 1.0 中二次离子的增加速率高于其他物种，并使硫酸盐和铵的质量分布峰移至更大的尺寸。SO 4 2 − ，NO 3 -和NH 4 + 约占70 PM 1.0 和PM 2.5 分别为％和40％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号