Preprints
https://doi.org/10.5194/acp-2022-440
https://doi.org/10.5194/acp-2022-440
 
13 Sep 2022
13 Sep 2022
Status: this preprint is currently under review for the journal ACP.

High frequency of new particle formation events driven by summer monsoon in the central Tibetan Plateau, China

Lizi Tang1, Min Hu1,2, Dongjie Shang1, Xin Fang1, Janjiong Mao2, Wanyun Xu3, Jiacheng Zhou4, Weixiong Zhao4, Yaru Wang1, Chong Zhang1, Yingjie Zhang5, Jianlin Hu2, Limin Zeng1,2, Chunxiang Ye1, Song Guo1,2, and Zhijun Wu1,2 Lizi Tang et al.
  • 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, International Joint Laboratory for Regional Pollution Control, Ministry of Education (IJRC), College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 2Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control. Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 3State Key Laboratory of Severe Weather & Key Laboratory for Atmospheric Chemistry of CMA, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing, 100081, China
  • 4Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanisms, HFIPS, Chinese Academy of Science, Hefei 230031, Anhui, China
  • 5School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China

Abstract. New particle formation (NPF) is an important source of cloud condensation nuclei (CCN), which affects Earth’s radiative balance and global climate. The mechanism and CCN contribution of NPF at the high-altitude mountains, especially in the Tibetan Plateau (TP), was unclear due to lack of measurements. In this study, intensive measurements were conducted at Nam Co station (4379 m a.s.l) in the central TP during both pre-monsoon and summer monsoon seasons. The frequencies of NPF events exhibited extreme distinction with 15 % in pre-monsoon season and 80 % in monsoon season. The level of organic vapours governed the occurrence of NPF events, while condensation sink and gaseous sulfuric acid had no effect. The frequent NPF events in summer monsoon season resulted from the higher concentration of organic vapours, which was brought from northeast India by the strong southerly monsoon. It had increased the aerosol number concentrations and CCN at supersaturation of 1.2 % by more than 2 and 0.5 times compared with those in pre-monsoon season, respectively. Considering that the smaller particles formed by NPF may further grow and reach CCN size during the following days due to the low-level coagulation sink, the amount of potential CCN in monsoon season could be much larger than our local measurement results. Our results emphasized the importance of organics to NPF in high-altitude atmosphere, and the seasonal effect of NPF at the high-altitude sites should be carefully considered in model simulations to reduce the uncertainty of global CCN budget.

Lizi Tang et al.

Status: open (until 25 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-440', Anonymous Referee #2, 22 Sep 2022 reply

Lizi Tang et al.

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Short summary
There was an evident distinction in the frequencies of NPF events at Nam Co station in the Tibetan Plateau with 15 % in pre-monsoon season and 80 % in monsoon season. The frequent NPF events in monsoon season resulted from the higher concentration of organic vapours, which was brought from northeast India by the strong southerly monsoon. It had increased significantly the amount of aerosol and CCN compared with those in pre-monsoon season, which may markedly affect the earth's radiation balance.
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