Seasonal Distributions of Anhydrosugars Derived from Rice Straw Burning
作者单位：Department of Safety Health and Environmental EngineeringNational Yunlin University of ScienceDouliouTaiwan
会议名称：《第十届全国气溶胶会议暨第六届海峡两岸气溶胶技术研讨会》
会议日期：2009年
学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学]
关 键 词：Biomass burning Rice straw Levoglucosan Particle size distributions
摘 要：Aerosol particles released from biomass and bio-fuel burning have large contributions to the global aerosol *** primary agricultural commodity in Taiwan is rice,similar to most countries in *** a long-term study collected between December 2006 and February 2008 in Yunlin County on the subtropical island of Taiwan. Ambient aerosol was examined for seasonal patterns（summer harvest *** harvest）in terms of size-resolved chemical *** concentrations,size distributions and diagnostic ratios of three anhydrosugars（levoglucosan,mannosan,and galactosan）,used as molecular tracers for biomass burning,are reported *** total of the three anhydrosugars（ΣAnhydrosugars）in PM2.5,PM10,and TSP during the winter harvest season was on average 478（±270）,494（±275）,and 618（±385）ng m -3 ,respectively,while the respective summer harvest season values were 449（±170）,888（±271）,and 1125（±391）ng m -3 .Levoglucosan concentrations showed a strong seasonal dependence in the ambient levels as well as size *** high PM2.5-10 fraction of levoglucosan during the summer harvest season is likely related to the wet ambient conditions,characteristic for summer time in southern *** addition to particle coagulation,uptake of water by ambient aerosol particles will result in increased particle size as ***,Levoglucosan/mannosan ratios in PM2.5 derived from rice straw burning processes revealed a clear signature for smoke aerosol from straw burning.