EGU2020-2146, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-2146
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Distinct particle properties between ultrafine and accumulation modes under clean and polluted urban environments

Yuying Wang1,4, Zhanqing Li2, Renyi Zhang3, Xiaoai Jin4, and Qiuyan Wang1
Yuying Wang et al.
  • 1Nanjing University of Information Science & Technology, Nanjing, China (yuyingwang@nuist.edu.cn)
  • 2University of Maryland, College Park, USA
  • 3Texas A&M University, College Station, USA
  • 4Beijing Normal University, Beijing, China

In this study, we report a phenomenon of fast changing in aerosol hygroscopicity between clean and pollution periods observed frequently in urban Beijing during winter using a hygroscopicity tandem mobility analyzer (H-TDMA). The cause of this phenomenon and the formation process of particles in different modes are discussed. During clean periods, ultrafine mode particles (Nucleation and Aitken modes) mainly stem from nucleation events with subsequent growth. During heavy pollution periods, they originate chiefly from primary emissions. Coarser-mode particles like accumulation mode particles are mainly from primary emission during clean periods and aqueous reactions during pollution periods. This finding based on H-TDMA measurement can make up the deficiency of mass-dependent instruments in analyzing sources and chemical processes of ultrafine mode particles.

How to cite: Wang, Y., Li, Z., Zhang, R., Jin, X., and Wang, Q.: Distinct particle properties between ultrafine and accumulation modes under clean and polluted urban environments, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-2146, https://doi.org/10.5194/egusphere-egu2020-2146, 2020

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