Temporal and spatial variations of water-soluble ions in PM2 5 during 2013-2019 in Taiwan and their evolution processes during PM2 5 haze event

  • 林 帥和

Student thesis: Doctoral Thesis

Abstract

This study discusses the water-soluble ions in PM2 5 during 2013-2019 in Taiwan and their evolution processes during PM2 5 haze event From 2013 to 2016 the sulfate fraction in PM2 5 decreased about 3-22% but the composition of other components in PM2 5 increased The spatial distribution of the fraction of nitrate in each season is similar to that of PM2 5 but fraction of sulfate does not have similar pattern in Taiwan In the different PM2 5 concentrations the fraction of nitrate in PM2 5 increases with the PM2 5 concentration and nitrate concentration increment rate is 3 15 times greater than that of PM2 5 The possible mechanism for the formation of high PM2 5 event days is the photochemical reaction between NO2 and ozone on the day before the day of high PM2 5 event days to form NO3 radical and the formation of NO3 radical will react with high concentration of NO2 at night to form N2O5 The concentration of PM2 5 increases because of the liquid-phase reaction between N2O5 and water to form a large amount of nitric acid gas which reacts with NH3 to form PM2 5
Date of Award2020
Original languageEnglish
SupervisorYee-Lin Wu (Supervisor)

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