Nitrate radical, ozone and hydroxyl radical initiated aging of limonene secondary organic aerosol

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...

Indoor secondary organic aerosol formation initiated from reactions between ozone and surface-sorbed D-limonene.

Reactions between ozone and terpenoids produce numerous products, some of which may form secondary organic aerosol (SOA). This work investigated the contribution to gas-phase SOA formation of ozone reactions with surface-sorbed D-limonene, which is common indoors. A model framework was developed to predict SOA mass formation because of ozone/terpenoid surface reactions, and it was used with ste...

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

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

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 Criege...

Aging of biogenic secondary organic aerosol via gas-phase OH radical reactions.

The Multiple Chamber Aerosol Chemical Aging Study (MUCHACHAS) tested the hypothesis that hydroxyl radical (OH) aging significantly increases the concentration of first-generation biogenic secondary organic aerosol (SOA). OH is the dominant atmospheric oxidant, and MUCHACHAS employed environmental chambers of very different designs, using multiple OH sources to explore a range of chemical condit...