Ambient volatile organic compounds at a receptor site in the Pearl River Delta region: Variations, source apportionment and effects on ozone formation

作者：Meng, Yao; Song, Junwei; Zeng, Lewei; Zhang, Yingyi; Zhao, Yan; Liu, Xufei; Guo, Hai; Zhong, Liuju; Ou, Yubo; Zhou, Yan; Zhang, Tao; Yue, Dingli^*; Lai, Senchao^*

来源：JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA, 2022, 111: 104-117.

DOI：10.1016/j.jes.2021.02.024

• Volatile organic compounds (VOCs)
• Pearl River Delta (PRD) region
• Source apportionment
• Ozone (O 3 )
• Regional transport

We present the continuously measurements of volatile organic compounds (VOCs) at a receptor site (Wan Qing Sha, WQS) in the Pearl River Delta (PRD) region from September to November of 2017. The average mixing ratios of total VOCs (TVOCs) was 36.3 +/- 27.9 ppbv with the dominant contribution from alkanes (55.5%), followed by aromatics (33.3%). The diurnal variation of TVOCs showed a strong photochemical consumption during daytime, resulting in the formation of ozone (O 3 ). Five VOC sources were resolved by the positive matrix factorization (PMF) model, including solvent usage (28.6%), liquid petroleum gas (LPG) usage (24.4%), vehicle exhaust (21.0%), industrial emissions (13.2%) and gasoline evaporation (12.9%). The regional transport air masses from the upwind cities of south China can result in the elevated concentrations of TVOCs. Low ratios of TVOCs/NO x (1.53 +/- 0.88) suggested that the O 3 formation regime at WQS site was VOC-limited, which also confirmed by a photochemical box model with the master chemical mechanism (PBM-MCM). Furthermore, the observation on high-O 3 episode days revealed that frequent O 3 outbreaks at WQS were mainly caused by the regional transport of anthropogenic VOCs especially for aromat ics , the subsequent photochemical reactions. This study provides valuable information for policymakers to propose the effective control strategies on photochemical pollution in a regional perspective.

• 单位
  1