18 Feb 2022
18 Feb 2022
Status: this preprint is currently under review for the journal ACP.

Different effects of anthropogenic emissions and aging processes on the mixing state of soot particles in the nucleation and accumulation modes

Yuying Wang1,2, Rong Hu1,2, Qiuyan Wang1, Zhanqing Li3, Maureen Cribb3, Yele Sun4, Xiaorui Song1, Yi Shang1, Yixuan Wu1, Xin Huang1, and Yuxiang Wang1 Yuying Wang et al.
  • 1Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 2State Key Laboratory of Remote Sensing Science, College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China
  • 3Earth System Science Interdisciplinary Center, Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, USA
  • 4State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

Abstract. In this study, the mixing state of size-resolved soot particles and their influencing factors were investigated based on a five-month aerosol volatility measurement at a suburban site (Xingtai, XT) in the central North China Plain (NCP). The volatility and mixing state of soot particles at XT were complex caused by multiple pollution sources and various aging processes. The results suggest that anthropogenic emissions can weaken the volatility of soot particles and enhance their degree of external mixing. There were fewer externally mixed soot particles in warm months (June, July, and August) than in cold months (May, September, and October). Monthly variations in the mean coating depth (Dc,mean) of volatile matter on soot particles showed that the coating effect was stronger in warm months than in cold months, even though aerosol pollution was heavier in cold months. Moreover, the volatility was stronger, and the degree of internal mixing was higher in nucleation-mode soot particles than in accumulation-mode soot particles. Relationships between Dc,mean and possible influencing factors [temperature (T), relative humidity (RH), and particulate matter with diameters ranging from 10 to 400 nm] further suggest that high ambient T and RH in a polluted environment could promote the coating growth of accumulation-mode soot particles. However, high ambient T but low RH in a clean environment were beneficial to the coating growth of nucleation-mode soot particles. Our results highlight the diverse impact of anthropogenic emissions and aging processes on the mixing state of soot particles in different modes, which should be considered separately in models to improve the simulation accuracy of aerosol absorption.

Yuying Wang et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-1065', Anonymous Referee #1, 09 Apr 2022 reply

Yuying Wang et al.

Yuying Wang et al.


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Short summary
The mixing state of size-resolved soot particles and their influencing factors were investigated. The results suggest anthropogenic emissions and aging processes (photochemical and liquid phase chemical reactions) have diverse impacts on the mixing state of soot particles in different modes. Considering that the mixing state of soot particles is crucial to model aerosol absorption, this finding is important to study the warming effect of back carbon aerosols.