The seasonal effect on ambient anhydrosugar characteristic derived from biomass burning in Yunlin Taiwan

碩士 === 國立雲林科技大學 === 防災與環境工程研究所 === 97 === Biomass burning is the atmospheric particulate one of the major sources of pollution, air quality in Taiwan''s Yunlin areas often affected by biomass burning. This study was collected by two years (2007,2008 years) of three particle size of anhydro...

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Bibliographic Details
Main Authors: Yi-Sing Chen, 陳怡杏
Other Authors: James J. Lee
Format: Others
Language:zh-TW
Published: 2009
Online Access:http://ndltd.ncl.edu.tw/handle/08782320390781831484
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Summary:碩士 === 國立雲林科技大學 === 防災與環境工程研究所 === 97 === Biomass burning is the atmospheric particulate one of the major sources of pollution, air quality in Taiwan''s Yunlin areas often affected by biomass burning. This study was collected by two years (2007,2008 years) of three particle size of anhydrosugars (PM2.5, PM2.5-10, TSP), to explore seasonal distribution of anhydrosugars and carbon element. The results showed that anhydrosugar Levoglucosan two years similar to the distribution , due to weather conditions (such as typhoons, rainfall) affected, making the summer of 2007 concentration more than 1 to 3 into. Particle size distribution in the two years are required mainly PM2.5 fine particles (TSP 60% accounted for above), coarse particles (PM> 10) accounted for more than TSP 20%; There are significant differences coarse particles (PM2.5 -10) distribution in the summer may be climatic factors and atmospheric moisture content high, resulting in coarse particles in 2007 was significantly higher than in 2008. The ratio of anhydrosugars ( Levoglucosan / Mannosan ) distribution varies greatly of the summer two years, 2007 about 2 times higher (57.4 VS. 24.3), may be sampling when the more volatile atmosphere (including atmospheric high water) in 2007, resulting in the summer of 2007 the ratio increased significantly. OC concentrations in this study for two years in autumn and winter are the highest when the concentration of high-temperature phenomena have attenuation in summer. Yunlin Taiwan are subject to almost the full year impact of biomass burning, this study suggests that by Levo / OC ratio of biomass burning to distinguish between levels, such as Levo / OC> 0.03, Levo concentration> 300 ng/m3 are severe biomass burning events . In this study, anhydrosugars particles from two years of data to estimate the contribution of atmospheric PM2.5 particles amounted to 13.3%, which contributed to the lowest in spring (5 ~ 6%), Taiwan Yunlin area located at the leeward side of the northeast monsoon adverse atmospheric diffusion, in the case of biomass burning straw will seriously affect the regional air quality. This study investigated the anhydrosugars concentration in the atmosphere significantly help to understand the burning biomass distribution characteristics of atmospheric particles and the impact on air quality.