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. Atmospheric organic nitrate (ON) is thought to play a crucial role in theformation potential of ozone and aerosol, which are the leading airpollutants of concern across the world. Limited fundamental knowledge andunderstanding of the life cycles of ON currently hinder the ability toquantitatively assess its impacts on the formation of these pollutants.Although hydrolysis is currently considered an important loss mechanismof ON based on prior field measurement studies, this process foratmospherically relevant ON has not been well constrained by fundamentallaboratory studies. In this comprehensive study, we investigated thechemical composition and hydrolysis process of particulate ON (pON)formed from the oxidation of α-pinene and β-pinene byhydroxyl (OH⚫) and nitrate radicals (NO3⚫). ForpON that undergoes hydrolysis, the hydrolysis lifetime is determined tobe no more than 30 min for all systems explored. This is significantlyshorter than those reported in previous chamber studies (i.e., 3–6 h) but isconsistent with the reported lifetime from bulk solution measurement studies(i.e., 0.02–8.8 h). The discrepancy appears to stem from the choice of proxyused to estimate the hydrolysis lifetime. The measured hydrolyzablefractions of pON (FH) in the α-pinene + OH⚫,β-pinene + OH⚫, α-pinene + NO3⚫,and β-pinene + NO3⚫ systems are 23 %–32 %, 27 %–34 %, 9 %–17 %,and 9 %–15 %, respectively. While a very low FH for theNO3⚫ oxidation system is expected based on prior studies,FH for the OH⚫ oxidation system is surprisingly lower thanpredicted in past studies. Overall, the hydrolysis lifetime as well asFH obtained in this study serve as experimentally constrainedparameters that are required in regional and global chemical transportmodels to accurately evaluate the impacts of ON on nitrogen budget andformation of ozone and aerosol.

atmospheric chemistry and physics

Chemical composition and hydrolysis of organic nitrate aerosol formed from hydroxyl and nitrate radical oxidation of &amp;lt;i&amp;gt;α&amp;lt;/i&amp;gt;-pinene and &amp;lt;i&amp;gt;β&amp;lt;/i&amp;gt;-pinene