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New particle formation (NPF) is an important atmospheric phenomenon. Duringan NPF event, particles first form by nucleation and then grow further insize. The growth step is crucial because it controls the number of particlesthat can become cloud condensation nuclei. Among various physical andchemical processes contributing to particle growth, condensation by organicvapors has been suggested as important. In order to better understand theinfluence of biogenic emissions on particle growth, we carried out modelingstudies of NPF events during the BEACHON-ROCS (Bio–hydro–atmosphere interactions of Energy, Aerosol,Carbon, H2O, Organics & Nitrogen – Rocky Mountain Organic Carbon Study) campaign at ManitouExperimental Forest Observatory in Colorado, USA. The site is representativeof the semi-arid western USA. With the latest Criegee intermediate reactionrates implemented in the chemistry scheme, the model underestimates sulfuricacid concentration by 50 %, suggesting either missing sources ofatmospheric sulfuric acid or an overestimated sink term. The resultsemphasize the contribution from biogenic volatile organic compound emissionsto particle growth by demonstrating the effects of the oxidation products ofmonoterpenes and 2-Methyl-3-buten-2-ol (MBO). Monoterpene oxidation productsare shown to influence the nighttime particle loadings significantly, whiletheir concentrations are insufficient to grow the particles during the day.The growth of ultrafine particles in the daytime appears to be closely related tothe OH oxidation products of MBO

Contribution from biogenic organic compounds to particle growth during the 2010 BEACHON-ROCS campaign in a Colorado temperate needleleaf forest