Preprints
https://doi.org/10.5194/acp-2022-141
https://doi.org/10.5194/acp-2022-141
 
02 Mar 2022
02 Mar 2022
Status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Evolution of source attributed organic aerosols and gases in a megacity of central China

Siyuan Li1, Dantong Liu1, Shaofei Kong2, Yangzhou Wu1, Kang Hu1, Huang Zheng2, Yi Cheng2, Shurui Zheng2, Xiaotong Jiang1, Shuo Ding1, Dawei Hu3, Quan Liu4, Ping Tian5,6, Delong Zhao5,6, and Jiujiang Sheng5,6 Siyuan Li et al.
  • 1Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
  • 2Department of Atmospheric Sciences, School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China
  • 3Centre for Atmospheric Sciences, School of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK
  • 4State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • 5Beijing Key Laboratory of Cloud, Precipitation and Atmospheric Water Resources, Beijing Meteorological Service, Beijing 14 100089, China
  • 6Field Experiment Base of Cloud and Precipitation Research in North China, China Meteorological Administration, Beijing 100089, China

Abstract. The secondary production of the oxygenated organic aerosol (OOA) impacts air quality, climate and human health. The importance of various sources in contributing to the OOA loading and associated different aging mechanisms remains to be elucidated. Here we present concurrent observation and factorization analysis on the mass spectra of organic aerosol (OA) by a high-resolution aerosol mass spectrometer and volatile organic compounds (VOCs) by a proton-transfer-reaction mass spectrometer in Wuhan, a megacity in central China during autumntime. The full mass spectra of organics with two principle anthropogenic sources were identified as the traffic and cooking sources, for their primary emission profiles in aerosol and gas phases, the evolutions, and their respective roles in producing OOA and secondary VOCs. Primary emissions in gas and aerosol phases both contributed to the production of OOA. The photooxidation of traffic sources from morning rush-hour caused 2.5-folds increase of OOA mass in a higher oxidation state (O / C = 0.72), coproducing gas-phase carboxylic acids; while at night, cooking aerosols and VOCs (particularly acrolein and hexanal) importantly caused the nocturnal formation of oxygenated intermediate VOCs, increasing OOA mass by a factor of 1.7 (O / C = 0.42). The daytime and nighttime formation of secondary aerosols as contributed by different sources, was found to be modulated by solar radiation and air moisture respectively. The environmental policy should therefore consider the primary emissions and their respective ageing mechanisms influenced by meteorological conditions.

Siyuan Li et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-141', Anonymous Referee #1, 16 Mar 2022
    • AC1: 'Reply on RC1', Dantong Liu, 18 Apr 2022
  • RC2: 'Comment on acp-2022-141', Anonymous Referee #2, 17 Mar 2022
    • AC2: 'Reply on RC2', Dantong Liu, 18 Apr 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-141', Anonymous Referee #1, 16 Mar 2022
    • AC1: 'Reply on RC1', Dantong Liu, 18 Apr 2022
  • RC2: 'Comment on acp-2022-141', Anonymous Referee #2, 17 Mar 2022
    • AC2: 'Reply on RC2', Dantong Liu, 18 Apr 2022

Siyuan Li et al.

Viewed

Total article views: 479 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
364 104 11 479 25 6 6
  • HTML: 364
  • PDF: 104
  • XML: 11
  • Total: 479
  • Supplement: 25
  • BibTeX: 6
  • EndNote: 6
Views and downloads (calculated since 02 Mar 2022)
Cumulative views and downloads (calculated since 02 Mar 2022)

Viewed (geographical distribution)

Total article views: 488 (including HTML, PDF, and XML) Thereof 488 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 26 May 2022
Download
Short summary
The understanding for secondary organic aerosols is hindered by the aerosol-gas evolution by different oxidation mechanisms. By concurrently online measuring detailed mass spectra of aerosol and gas phases in a megacity, we identified the primary and secondary source sectors, and investigated the transformation between gas and aerosol phases influenced by photooxidation and moisture. The results will help understand the respective evolution of major sources in a typical urban environment.
Altmetrics