On the Optical Effects of Atmospheric Aerosols from Pm2.5 Chemical Components under Various Transported Air Masses in Asia

This study proposes to observe high-elevation aerosol at the Mountain Lulin (2,862 m) atmospheric background station for the next year. The observation scope includes physical and chemical properties of atmospheric aerosols during regional background and event (influenced by long-range transport of Indochina biomass burning (BB) smoke and China haze) periods. In addition, this study will collaborate with general project to participate in NASA Cloud, Aerosol and Monsoon Processes Philippines Experiment (CAMP2Ex) by collecting daily aerosol for analyzing chemical properties at Hengchun or Dongsha or Taiping island in autumn 2018. Moreover, this study will participate in various QA/QC plans of international monitoring networks with the collaboration of Cape Fuguei of Academic Sinica by collecting aerosol at both Mountain Lulin and Bamboo sites (1,103 m a.s.l.). The third large scale international intensive study of 7-SEAS 2019 campaign on aerosol transport and cloud interaction will be held during extensive Indochina BB period from March to April in 2019. The campaign aims at investigating the interaction of aerosol, cloud, and radiation along with the path of northern Thailand, northern Vietnam, and Taiwan. Among various activities, this study is responsible for investigating the environmental effect of transported BB smoke and related pollutants observed at Mountain Lulin. The detailed PM2.5 observation items contain mass concentration, water-soluble inorganic ions, carbonaceous content, water-soluble organic carbon, humic like substance, anhydrosugars, and aerosol water content. For the aspect of automated instruments, the combination of particle-into-liquid ion chromatograph (PILS-IC) and the in-situ water content analyzer assembled in previous years will facilitate this study to evaluate the integrated short-interval (15 min) relationship among aerosol water content, aerosol optical coefficients, and water-soluble inorganic ions. The observation results will contrast the differences of mountain aerosol characteristics between event (BB smoke transport, cloud/fog occurrence, and Asian haze outflow) and no-event (regional background) periods. In summary, this study will utilize the acquired comprehensive data to investigate aerosol properties of background air in the East Asia, transported BB air masses, and pre- and post-cloud event at Mountain Lulin. The observed data combining with previous findings can further provide aerosol chemical and optical properties for modelers to assess aerosol-cloud-radiation-climate interaction in the East Asia.