TY - JOUR
T1 - Ambient volatile organic compounds at a receptor site in the Pearl River Delta region
T2 - Variations, source apportionment and effects on ozone formation
AU - Meng, Yao
AU - Song, Junwei
AU - Zeng, Lewei
AU - Zhang, Yingyi
AU - Zhao, Yan
AU - Liu, Xufei
AU - Guo, Hai
AU - Zhong, Liuju
AU - Ou, Yubo
AU - Zhou, Yan
AU - Zhang, Tao
AU - Yue, Dingli
AU - Lai, Senchao
N1 - Funding Information:
The work was supported by the National Key R&D Program of China (Nos. 2017YFC0212802 and 2017YFC0212004 ). We also acknowledge the support of MOST project (No. 2017YFC0212001 ) for the collaboration.
Publisher Copyright:
© 2021
PY - 2022/1
Y1 - 2022/1
N2 - 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 (O3). 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/NOx (1.53 ± 0.88) suggested that the O3 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-O3 episode days revealed that frequent O3 outbreaks at WQS were mainly caused by the regional transport of anthropogenic VOCs especially for aromatics and the subsequent photochemical reactions. This study provides valuable information for policymakers to propose the effective control strategies on photochemical pollution in a regional perspective.
AB - 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 (O3). 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/NOx (1.53 ± 0.88) suggested that the O3 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-O3 episode days revealed that frequent O3 outbreaks at WQS were mainly caused by the regional transport of anthropogenic VOCs especially for aromatics and the subsequent photochemical reactions. This study provides valuable information for policymakers to propose the effective control strategies on photochemical pollution in a regional perspective.
KW - Ozone (O)
KW - Pearl River Delta (PRD) region
KW - Regional transport
KW - Source apportionment
KW - Volatile organic compounds (VOCs)
UR - http://www.scopus.com/inward/record.url?scp=85103313632&partnerID=8YFLogxK
U2 - 10.1016/j.jes.2021.02.024
DO - 10.1016/j.jes.2021.02.024
M3 - Journal article
AN - SCOPUS:85103313632
SN - 1001-0742
VL - 111
SP - 104
EP - 117
JO - Journal of Environmental Sciences (China)
JF - Journal of Environmental Sciences (China)
ER -
