Vapor pressures and enthalpies of vaporization of a series of the linear aliphatic aldehydes

Kinetic multi-layer model of gas-particle interactions in aerosols and clouds (KM-GAP): linking condensation, evaporation and chemical reactions of organics, oxidants and water

“…The products of oleic acid oxidation by ozone are mainly 1-nonanal, 9-oxononanoic acid, nonanoic acid, azelaic acid, and peroxidic dimer (e.g. Zahardis and Petrucci, 2007;Vesna et al, 2009). Known and estimated physical properties of oleic acid and its products are summarized in Table 2.…”

“…Note that in our earlier studies D b for oleic acid was assumed to 10 −10 cm 2 s −1 Shiraiwa et al, 2010), but here we provide a better estimate of 1.9×10 −7 cm 2 s −1 . Additional input parameters were the mean thermal velocity of ozone (ω Z 1 = 3.6 × 10 4 cm s −1 ), the Henry's law coefficient of ozone (K sol,cc,Z 1 = 4.8 × 10 −4 mol cm −3 atm −1 ), the vapor pressure of nonanal (∼0.4 Torr) (Verevkin et al, 2003), and desorption lifetime of nonanal which is assumed to be 10 −4 s. For simplicity the kinetic parameters were assumed to be constant throughout each model run. Note that the actual reaction mechanism might be more complex, involving the formation of reactive oxygen intermediates (ROIs) with a different set of kinetic parameters including a shorter ozone desorption lifetime (Shiraiwa et al, 2011a, b).…”

“…For water condensation the heat flux Q directed away from a single droplet can be expressed as (Vesala et al, 1997;Winkler et al, 2006):…”

“…β T is the transitional correction factor for heat transfer given by (Vesala et al, 1997;Winkler et al, 2006) …”

“…The humidity ratio x given in units of g g −1 is the ratio between the actual mass of water vapor present in moist air to the mass of the dry air. The droplet surface temperature T s can be obtained from the heat balance equation (Vesala et al, 1997).…”