1 research outputs found
Parameterized Yields of Semivolatile Products from Isoprene Oxidation under Different NO<sub><i>x</i></sub> Levels: Impacts of Chemical Aging and Wall-Loss of Reactive Gases
We
developed a parametrizable box model to empirically derive the
yields of semivolatile products from VOC oxidation using chamber measurements,
while explicitly accounting for the multigenerational chemical aging
processes (such as the gas-phase fragmentation and functionalization
and aerosol-phase oligomerization and photolysis) under different
NO<sub><i>x</i></sub> levels and the loss of particles and
gases to chamber walls. Using the oxidation of isoprene as an example,
we showed that the assumptions regarding the NO<sub><i>x</i></sub>-sensitive, multigenerational aging processes of VOC oxidation
products have large impacts on the parametrized product yields and
SOA formation. We derived sets of semivolatile product yields from
isoprene oxidation under different NO<sub><i>x</i></sub> levels. However, we stress that these product yields must be used
in conjunction with the corresponding multigenerational aging schemes
in chemical transport models. As more mechanistic insights regarding
SOA formation from VOC oxidation emerge, our box model can be expanded
to include more explicit chemical aging processes and help ultimately
bridge the gap between the process-based understanding of SOA formation
from VOC oxidation and the bulk-yield parametrizations used in chemical
transport models