Potential deterioration of ozone pollution in coastal areas caused by marine-emitted halogens: A case study in the Guangdong-Hong Kong-Macao Greater Bay Area

Shidong Fan1,2; Ying Li1,2,3

2023-02-20

10.1016/j.scitotenv.2022.160456

SCIENCE OF THE TOTAL ENVIRONMENT   Impact Factor & Quartile

0048-9697

1879-1026

Ozone (O) is one of the most important air pollutants worldwide in terms of its great damage to human health and agriculture. Previous studies show that marine-emitted halogens significantly influence O concentrations, mainly through the consumption of O by bromine and iodine atoms. In this study, we investigate the temporal variation at finer time scales (daily and hourly) than previous studies (annual or monthly) to better characterize the influence of marine-emitted halogens on coastal O. In contrast to previous studies that mainly reported a decrease in O, our results show significant temporal variations in halogen-induced O changes. More specifically, the halogen-induced decrease in coastal O in southern China is concentrated on clean days, while an unexpected increase in some regions of up to >10 ppbv could occur on polluted days. On polluted days, the activation of particulate chloride (Cl) in sea salt aerosol (SSA) is effective due to the high level of dinitrogen pentoxide (NO) that is formed from the reactions of O and nitrogen dioxide (NO). In addition, the wind fields are unfavorable for the transport of marine air masses with large O depletion inland. These two factors together result in the increase in hourly and MDA8 O on polluted days in some regions in the GBA. The locations of O increases are controlled by the distribution of nitryl chloride (ClNO) at sunrise, which is influenced by O and NO during the previous night. As a result, the increase in O is a continuation of the O pollution from the previous day, and the whole area is under potential threat of this worsening pollution.

Halogen species Marine emissions Nitryl chloride Ozone Particulate chloride

SCI

English

First ; Corresponding

National Natural Science Foundation of China[41961160728/41575106] ; Key-Area Research and Development Program of Guangdong Province[2020B1111360001] ; Guangdong Basic and Applied Basic Research Fund Committee[2020B1515130003/2019A1515110384] ; Shenzhen Science and Technology Program[KQTD20180411143441009/KCXFZ20211020174803005] ; Guangdong Province Science and Technology Planning Project of China[2017A050506003] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0210] ; NSFC/RGC[N_HKUST638/19]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000922004100001

ELSEVIER

ENVIRONMENT/ECOLOGY

2-s2.0-85144398075

Scopus

1.Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
2.Center for the Oceanic and Atmospheric Science at SUSTech (COAST), Southern University of Science and Technology, Shenzhen 518055, China
3.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China

Shidong Fan,Ying Li. Potential deterioration of ozone pollution in coastal areas caused by marine-emitted halogens: A case study in the Guangdong-Hong Kong-Macao Greater Bay Area[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2023,860.

Shidong Fan,&Ying Li.(2023).Potential deterioration of ozone pollution in coastal areas caused by marine-emitted halogens: A case study in the Guangdong-Hong Kong-Macao Greater Bay Area.SCIENCE OF THE TOTAL ENVIRONMENT,860.

Shidong Fan,et al."Potential deterioration of ozone pollution in coastal areas caused by marine-emitted halogens: A case study in the Guangdong-Hong Kong-Macao Greater Bay Area".SCIENCE OF THE TOTAL ENVIRONMENT 860(2023).