Interactive comment on “Dimer esters in α-pinene secondary organic aerosol: effect of hydroxyl radical, ozone, relative humidity and aerosol acidity” by K. Kristensen et al
نویسنده
چکیده
dimers from alpha-pinene are formed. This is an actual topic in atmospheric sciences as high-molecular weight products are likely involved in new particle formation under ambient conditions. Unambiguous evidence is provided that high-molecular weight diesters are formed through ozonolysis and not through OH-initiated oxidation of alphapinene, and involve the participation of a stabilized Criegee intermediate (sCI), thus revising a previous formation mechanism, proposed in Yasmeen et al. (2010), where the high-molecular weight diesters have been explained by esterification of monomeric terpenoic acids in the particle phase. A reasonable explanation is given why in field studies conducted at K-puszta, Hungary, or the Blodgett forest, USA, the high-molecular weight diesters are mainly detected during night-time when ozone chemistry may occur. Evidence is also provided that diaterpenylic acid acetate (DTAA) is formed through OH-initiated oxidation of alpha-pinene and does not serve as a monomer for the MW 358 dimer.
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Interactive comment on “Dimer esters in α-pinene secondary organic aerosol: effect of hydroxyl radical, ozone, relative humidity and aerosol acidity” by K. Kristensen et al
متن کامل
Dimers in α-pinene secondary organic aerosol: effect of hydroxyl radical, ozone, relative humidity and aerosol acidity
The formation of secondary organic aerosol (SOA) from both ozonolysis and hydroxyl radical (OH)-initiated oxidation of α-pinene under conditions of high nitric oxide (NO) concentrations with varying relative humidity (RH) and aerosol acidity was investigated in the University of North Carolina dual outdoor smog chamber facility. SOA formation from ozonolysis of α-pinene was enhanced relative to...
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تاریخ انتشار 2014