长江三角洲2010~2018年生物质燃烧中等挥发性有机物(IVOCs)排放清单

Emission Inventory of Intermediate Volatility Organic Compounds(IVOCs) from Biomass Burning in the Yangtze River Delta During 2010-2018

中等挥发性有机物(IVOCs)是一类重要的二次有机气溶胶(SOA)的前体物.其中,生物质燃烧是IVOCs的重要来源之一,但目前尚未包括在传统的排放清单中.本研究基于卫星火点排放清单(FINN)以及IVOCs/POA比例法对长三角地区2010至2018年生物质燃烧IVOCs的排放量进行估算,构建长三角地区2010~2018年基于卫星火点的生物质燃烧IVOCs排放清单,并分析其不确定性,为后续模拟长三角地区SOA的来源提供重要的基础数据.结果表明,在2010~2018年期间,长三角地区火点数整体呈现下降趋势,在过去3年(2016~2018年)火点数维持在6000次左右,较2016年之前下降了约60%.从火点数的月分布来看,火点发生最多的月份是5~8月,其次在10月有个小高峰.基于IVOCs/POA比例系数法的计算结果表明,由不同的POA/OC以及IVOCs/POA比例得到的长三角地区生物质燃烧IVOCs排放总量结果差别巨大,平均值为73.4万t(10.5~305.7万t).基于蒙特卡罗的不确定性模拟,长三角地区生物质燃烧IVOCs排放量的不确定范围在-99%~68%之间.

Intermediate volatility organic compounds(IVOCs)are important precursors of secondary organic aerosols(SOA)but are currently not included in the conventional emissions inventories.Biomass burning represents an important source of IVOCs that could contribute to SOA formation.This study estimated the IVOC emissions from biomass burning in the Yangtze River Delta(YRD)region from 2010 to 2018 based on the fire inventory from NCAR(FINN)and the IVOCs/primary organic aerosol(POA)ratio reported in literature.During this period,the total number of fire events over the YRD region presented a declining trend,with an average of 10~4 fire events detected per year.During 2016-2018,the average number of fire events was approximately 6000 per year,which was 60%less than that prior to 2016.In terms of the monthly variation,the period from May to August was the period with the most fires observed,which was followed by a small peak in October.The results calculated based on the IVOCs/POA ratio method showed that the IVOC emissions from biomass burning exhibited large differences with different combinations of POA/OC and IVOCs/POA ratios,ranging from a maximum of 305.7×10~4 t to as small as 10.5×10~4 t.Monte Carlo simulation revealed that the uncertainties associated with the IVOCs/POA ratio method range from-99%to 68%.