Anthropogenic Monoterpenes and Monoterpenoids as Important Precursors for Secondary Organic Aerosol in US Cities

MASOUD AKBARZADEH, Huiying Luo, Abraham Dearden, Alison Piasecki, Ann M. Middlebrook, Lauren A. Garofalo, Delphine K. Farmer, Matthew Coggon, Cort Zang, Karl Seltzer, Benjamin Murphy, Havala Pye, Katelyn Rediger, Carsten Warneke, Damien Ketcherside, Lu Hu, Tucker Melles, Audrey Lawrence, Megan Willis, Shantanu Jathar, Colorado State University

     Abstract Number: 359
     Working Group: Urban Aerosols

Abstract
Volatile chemical products (VCP) are likely to be important sources of secondary organic aerosol (SOA) precursors in urban environments. The use of personal care and cleaning products results in anthropogenic emissions of reactive organic compounds like terpenes (i.e., monoterpenes and monoterpenoids) that can be oxidized to form SOA. In this work, we combined environmental chamber data, kinetic models, and chemical transport models to study how terpenes may contribute to the anthropogenic SOA burden in cities in the United States. We analyzed chamber data on a multitude of terpenes (e.g., alpha-pinene, limonene, alpha-terpineol, and linalool), as well as mixtures like pine oil, to quantify their SOA mass yields. These data were used alongside a kinetic, process-level model (SOM-TOMAS) to develop volatility basis set parameters for a regional chemical transport model (CMAQ). Ongoing work is focused on the development and application of CMAQ to predict precursor-resolved estimates for SOA over several large cities in the US (e.g., Los Angeles, Chicago, New York City). We will compare the magnitude and patterns of terpene-originated SOA to those from transportation, industrial, and oil and gas activities, to understand the contribution of terpenes to urban air quality.