Effects of sea-land exchange on ozone and secondary aerosols in Mount Lao
ZHANG Ji, HUANG Liu-bin, ZHAO Min, SUN Yue, ZHAO Feng, CHEN Tian-shu, LIU Yu-hong, LI Hong-yong, SHAN Ye, MU Jiang-shan, JIANG Yue-ru, WANG Xin-feng, ZHU Yu-jiao, SHEN Heng-qing, DONG Can, WANG Wen-xing, XUE Li-kun
Environment Research Institute, Shandong University, Qingdao 266237, China
Abstract：To investigate the influence of multiscale sea-land exchange on surface ozone (O3) and secondary aerosols in coastal China, a comprehensive field campaign was carried out at Mount Lao in the spring of 2021. By employing the HYSPLIT model, the air masses can be divided into three types, i.e., Continental, Marine, and Mixed types, according to their total length of crossing oceans. The probabilities of these air masses were 44.5%, 35.6%, and 19.9%, respectively. Compared to Marine and Mixed types, the net photoproduction of O3 was more active under the control of Continental air masses, which can be up to 9.12×10-9h-1. The high-concentration night-time ozone under Continental and Mixed air masses controlled were related to sea-land breezes and ozone input from ocean regions, respectively. Furthermore, the difference in the composition of fine particulate matter (PM2.5) under the control of different air masses types was also investigated. NO3– was the dominant water-soluble inorganic ions (WSIIs) in PM2.5 for Continental air masses, which may be attributed to the promoted NO3– formation by the high concentration of NH4+. SO42– was the dominant WSIIs for Marine air masses, owing to the promoted SO42– formation resulting from the higher relative humidity. These results confirmed the significant differences in the characteristics of atmospheric secondary pollutants in coastal areas under the control of different air masses.
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