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Atmospheric aerosols exert highly uncertain impacts on radiative forcing andalso have detrimental effects on human health. While aerosol particles arewidely characterized in megacities in China, aerosol composition, sourcesand particle growth in rural areas in the Tibetan Plateau remain lessunderstood. Here we present the results from an autumn study that wasconducted from 5 September to 15 October 2013 at a national backgroundmonitoring station (3295 m a.s.l.) in the Tibetan Plateau. The submicronaerosol composition and particle number size distributions were measured insitu with an Aerodyne Aerosol Chemical Speciation Monitor (ACSM) and aScanning Mobility Particle Sizer (SMPS). The average mass concentration ofsubmicron aerosol (PM1) is 11.4 μg m−3 (range:1.0–78.4 μg m−3) for the entire study, which is much lower thanobserved at urban and rural sites in eastern China. Organics dominatedPM1, accounting for 43 % on average, followed by sulfate (28 %) andammonium (11 %). Positive Matrix Factorization analysis of ACSM organicaerosol (OA) mass spectra identified an oxygenated OA (OOA) and a biomassburning OA (BBOA). The OOA dominated OA composition, accounting for 85 % onaverage, 17 % of which was inferred from aged BBOA. The BBOA contributed aconsiderable fraction of OA (15 %) due to the burning of cow dung andstraw in September. New particle formation and growth events werefrequently observed (80 % of time) throughout the study. The averageparticle growth rate is 2.0 nm h−1 (range: 0.8–3.2 nm h−1).By linking the evolution of particle number size distribution to aerosolcomposition, we found an elevated contribution of organics during particlegrowth periods and also a positive relationship between the growth rate andthe fraction of OOA in OA, which potentially indicates an important role oforganics in particle growth in the Tibetan Plateau

Chemical characterization of submicron aerosol and particle growth events at a national background site (3295 m a.s.l.) on the Tibetan Plateau