Chemical Pathways Leading to Organic Aerosol Formation from the Atmospheric Oxidation of Alkanes and Alkenes

加州大学河滨分校的研究人员将继续系统的实验室研究非甲烷碳氢化合物（NMHC）的烷烃和烯烃部分的氧化途径，这些非甲烷碳氢化合物来自自然和人为来源，存在于城市和偏远的对流层空气中。特别是烷烃部分构成了城市大气中存在的NMHC的已知最大质量部分。然而，这些化合物与关键的大气氧化剂（如OH、NOx和臭氧）的一般反应性较低，并且它们与二次有机气溶胶（SOA）的氧化转化的研究不如异戊二烯和芳烃等反应性更强的化合物全面。SOA是由NMHCs和挥发性有机化合物（VOCs）的低蒸汽压反应产物冷凝产生的，是我们理解大气气溶胶对健康影响的细颗粒物（PM 2.5；直径小于2.5微米的颗粒物）的化学、生理学和流行病学的关键因素。SOA还对可见性和全局气候有影响。

Researchers from UC Riverside will continue systematic laboratory based investigations of the oxidation pathways of the alkane and alkene fractions of the non-methane hydrocarbons (NMHC) arising from natural and anthropogenic sources and found in urban and remote tropospheric air. The alkane fraction in particular constitutes the largest known mass fraction of NMHC present in urban atmospheres. However, these compounds exhibit a lower general reactivity with key atmospheric oxidants such as OH, NOx and ozone and their oxidative conversation to secondary organic aerosols (SOA) has been less comprehensively studied than more reactive compounds such as isoprene and aromatics. SOA, resulting from the condensation of low vapor pressure reaction products of NMHCs and volatile organic compounds (VOCs), are a key factor in our understanding the chemistry, physiology and epidemiology of the fine particulate matter (PM 2.5; particulate matter less than 2.5 microns in diameter) implicated in the health impacts of atmospheric aerosols. SOA also have effects on visibility and global climate.