A218-0004
Chemical composition of nano particles from α-pinene nucleation and the influence of isoprene

Wednesday, 16 December 2020
Poster
Lucía Caudillo Murillo1, Martin Peter Heinritzi2, Mario Simon2, Guillaume Marie2, Tatjana Müller2, Manuel Granzin2, Andrea C. Wagner3, Mingyi Wang4, Mihnea Surdu5, Neil McPherson Donahue4, Imad El-Haddad5, Andreas Kurten2 and Joachim Curtius2, (1)Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Frankfurt, Germany, (2)Goethe University Frankfurt, Institute for Atmospheric and Environmental Sciences, Frankfurt am Main, Germany, (3)University of Colorado Boulder, Department of Chemistry & CIRES, Boulder, United States, (4)Carnegie Mellon University, Center for Atmospheric Particle Studies, Pittsburgh, PA, United States, (5)Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, Villigen, Switzerland
Abstract:
New particle formation from organic precursors is an important atmospheric process. One of the most important precursors is α-pinene, which can form a suite of oxidation products covering a wide-range of volatilities. This work presents results on the gas and particle phase chemical composition for a system where α-pinene was oxidized by ozone. These data are further compared to the mixed system of α-pinene and isoprene in order to better understand the partitioning processes. The measurements took place at the CERN Cosmics Leaving Outdoor Droplets (CLOUD) chamber between -30 °C and -50 °C at low and high relative humidity (20% and 60-100% RH). These conditions were chosen to simulate pure biogenic new particle formation in the free troposphere.

The particle chemical composition was analyzed by the Thermal Desorption-Differential Mobility Analyzer (TD-DMA) coupled to a chemical ionization time-of-flight mass spectrometer. This unique instrument allows the direct comparison between gas and particle phase chemical composition as both measurements are using the same detection scheme.

Additionally, results for the particle chemical composition from the TD-DMA, an Extractive Electrospray Ionization Time of Flight Mass Spectrometer (EESI-TOF), and a Filter Inlet for Gases and Aerosols (FIGAERO) are inter-compared in order to better understand the properties of the secondary organic aerosols.

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