AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
The Contributions of Amines to Ambient Wintertime Aerosol as Measured by High-Resolution Aerosol Mass Spectrometry
COURTNEY L. HERRING, Graham VanderSchelden, Manjula Canagaratna, Donna Sueper, Paola Massoli, Serena H. Chung, B. Thomas Jobson, Timothy M. VanReken, Washington State University
Abstract Number: 322 Working Group: Remote and Regional Atmospheric Aerosols
Abstract We present the results of a three week winter-time campaign conducted in Yakima, Washington during January 2013 to investigate the gas- and particle-phase properties contributing to high winter-time particulate concentrations. Yakima is a mid-size city located in a semi-arid region with significant agricultural activities. The surrounding topography forms an enclosed valley that restricts horizontal air flow. The organic aerosol composition was characterized during the study using an Aerodyne High-Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS). Gas-phase organics were measured with a Proton Transfer Reaction Mass Spectrometer (PTR-MS) fitted with an IVOC sampler. Supporting measurements include the particle size distribution, black carbon mass, and meteorological data.
Analyses using positive matrix factorization of the organic aerosol signal revealed two time independent amine factors that have not been previously reported. Major contributing ions for these factors are associated with amine fragments C$_3H$_8N$^+, C$_4H$_(10)N$^+, C$_5H$_(12)N$^+, and C$_6H$_(14)N$^+. The presence of these factors in the organic aerosol were strongly episodic. We will present the results of our analyses investigating the sources of these amines and their connections with other atmospheric chemical and meteorological properties.