Chemical composition of nano particles from α-pinene nucleation and the influence of isoprene
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.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMA218.0004C
- Keywords:
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- 0317 Chemical kinetic and photochemical properties;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0340 Middle atmosphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0394 Instruments and techniques;
- ATMOSPHERIC COMPOSITION AND STRUCTURE