上海重霾期PM2.5碳质组分污染特征及来源分析
DOI:
作者:
作者单位:

1.南京信息工程大学;2.南京信息工程大学大气环境中心

作者简介:

通讯作者:

中图分类号:

X513

基金项目:

国家重点研发计划(2017YFC0210101),国家自然科学基金(41705100, 91644103, 41603104), 江苏省自然科学基金 (BK20170946), 江苏省高校面上项目 (17KJB170011).


Pollution Characteristics and Source Analysis of PM2.5 Carbonaceous Components in Shanghai Heavy Duty Period
Author:
Affiliation:

Nanjing University of Information Science & Technology

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    本研究基于Sunset碳分析仪对上海城区冬季重污染期PM2.5中的有机碳(OC)和元素碳(EC)浓度展开为期一个月(2014年12月1日至31日)的小时分辨率在线连续监测,并采用优化的最小R2算法对二次有机气溶胶(SOC)含量进行了估算.观测期间的PM2.5、OC和EC的平均浓度(mean±1σ)分别为67.5 ± 40.5 μg m-3,9.9 ± 4.8 μg m-3,3.1 ± 1.7 μg m-3,其中总碳TC占PM2.5质量浓度比重为32.2%.OC/EC的平均值为3.5,SOC的浓度2.4 ± 2.3 μg m-3,占OC比重为24.5%.EC浓度的日变化与车流量一致,呈现出显著的早晚高值,表明机动车是上海EC的主要污染源.SOC浓度在午后达到极大值,说明光化学反应是SOC形成的重要过程.对采样期间的一次典型污染事件(15日20:00至16日5:00)进行来源分析发现,来自于生物质燃烧输送和机动车一次排放的贡献较少,而SOC占OC的比重明显高于非污染期间,表明二次成核是雾霾期有机气溶胶污染的关键过程.

    Abstract:

    Based on the Sunset Carbon Analyzer, the hourly resolution of organic carbon (OC) and elemental carbon (EC) concentrations in PM2.5 during heavy winter pollution in Shanghai City was carried out for one month (December 1 to 31, 2014). On-line continuous monitoring and estimation of secondary organic aerosol (SOC) content using the optimized minimum R2 algorithm. The average concentration of PM2.5, OC and EC during observation (mean±1σ) was 67.5 ± 40.5 μg m-3, 9.9 ± 4.8 μg m-3, 3.1 ± 1.7 μg m-3, where in the total carbon TC accounts for 32.2% of the mass concentration of PM2.5. The average value of OC/EC is 3.5, and the concentration of SOC is 2.4±2.3μg m-3, accounting for 24.5% of OC. The daily variation of EC concentration is consistent with OC, showing a significant morning and evening high value, indicating that the motor vehicle is the main source of pollution for Shanghai EC. The SOC concentration reaches a maximum value in the afternoon, indicating Photochemical reaction is an important process of SOC formation. Source analysis of a typical pollution event during sampling (from 20:00 to 5:00 on the 15th) found that there is less contribution from biomass combustion and primary emissions from motor vehicles. The proportion of SOC to OC is significantly higher than that of non-polluting period, indicating that secondary nucleation is the key processes in the organic aerosol pollution during the haze period.

    参考文献
    相似文献
    引证文献
引用本文

刘子贺,常运华,鲍孟盈,等. 上海重霾期PM2.5碳质组分污染特征及来源分析[J]. 科学技术与工程, 2019, 19(11): .
Liuzihe,,Baomengying, et al. Pollution Characteristics and Source Analysis of PM2.5 Carbonaceous Components in Shanghai Heavy Duty Period[J]. Science Technology and Engineering,2019,19(11).

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2018-11-16
  • 最后修改日期:2019-01-25
  • 录用日期:2019-01-29
  • 在线发布日期: 2019-04-25
  • 出版日期:
×
律回春渐,新元肇启|《科学技术与工程》编辑部恭祝新岁!
亟待确认版面费归属稿件,敬请作者关注