气候变化领域集成服务门户(CCPortal): The impact of sea-salt chloride on ozone through heterogeneous reaction with N2O5 in a coastal region of south China

CCPortal

DOI	10.1016/j.atmosenv.2020.117604
	The impact of sea-salt chloride on ozone through heterogeneous reaction with N2O5 in a coastal region of south China
	Dai J.; Liu Y.; Wang P.; Fu X.; Xia M.; Wang T.
发表日期	2020
ISSN	1352-2310
卷号	236
英文摘要	In coastal regions, particulate chloride (Cl−) in sea-salt can react with gaseous dinitrogen pentoxide (N2O5) and produces nitryl chloride (ClNO2) after the heterogeneous uptake of N2O5. Photolysis of ClNO2 by sunlight enhances atmospheric oxidation capacity and contributes to the formation of ozone (O3). Using a regional chemical model (WRF-Chem), we evaluated the emission of particulate Cl− from the South China Sea, the chlorine loss in sea-salt aerosols, and the impact of sea-salt chloride on O3 formation over the Hong Kong-Pearl River Delta (HK-PRD) and surrounding maritime regions. Two typical O3 episodes in early autumn (September 2017 and 2018) were analyzed. The modeled results of particulate Cl− agreed well with the observations at a coastal site in both two cases, but the model underestimated ClNO2 by a factor of 2 in the 2018 case when N2O5 and ClNO2 were measured. The temporal and spatial distributions of chloride loss and ClNO2 production were simulated for the 2017 case which contained maritime inflow and continental outflow. During maritime winds, the oceanic fine particulate Cl− penetrated deep inland and was depleted by up to 40% by N2O5 heterogeneous reaction which lead to elevated ClNO2 mixing ratios (up to 0.6 ppb) produced at night. During the phase of continental outflow, the heterogeneous reaction of N2O5 contributed 18–33% to the depletion of particulate sea-salt Cl− in the coastal areas, leading to an increase in ClNO2 mixing ratio up to 0.8 ppb in the residual layer (~300 m). The ClNO2 from sea-salt chloride increased the O3 mixing ratios by up to 2.0 ppb (4%) over the inland areas during marine winds and up to 3.8 ppb (5.5%) and 6.5 ppb (7.6%) over the South China Sea. This study highlights the considerable impact of the heterogeneous reaction of reactive nitrogen on chlorine loss of sea-salt and O3 formation in coastal regions. © 2020 Elsevier Ltd
关键词	Chlorine loss Heterogeneous reaction Ozone Sea-salt chloride WRF-Chem
语种	英语
scopus关键词	Chlorine; Coastal zones; Mixing; Ozone; Particles (particulate matter); Photolysis; Atmospheric oxidation capacity; Continental outflow; Dinitrogen pentoxide; Fine particulates; Heterogeneous reactions; Pearl River delta; Reactive nitrogen; Temporal and spatial distribution; Chlorine compounds; dinitrogen pentoxide; ozone; sodium chloride; chemical reaction; chloride; coastal zone; oxidation; ozone; sea salt; seasonal variation; Article; autumn; chemical model; chemical reaction; coastal waters; mathematical model; meteorology; night; oxidation; photolysis; priority journal; sea; secondary organic aerosol; South China Sea; wind; China; Guangdong; Hong Kong; Pacific Ocean; South China Sea; Zhujiang Delta
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249077
作者单位	Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
推荐引用方式 GB/T 7714	Dai J.,Liu Y.,Wang P.,et al. The impact of sea-salt chloride on ozone through heterogeneous reaction with N2O5 in a coastal region of south China[J],2020,236.
APA	Dai J.,Liu Y.,Wang P.,Fu X.,Xia M.,&Wang T..(2020).The impact of sea-salt chloride on ozone through heterogeneous reaction with N2O5 in a coastal region of south China.ATMOSPHERIC ENVIRONMENT,236.
MLA	Dai J.,et al."The impact of sea-salt chloride on ozone through heterogeneous reaction with N2O5 in a coastal region of south China".ATMOSPHERIC ENVIRONMENT 236(2020).