Isoprene and their oxidation products in the rural atmosphere of the Amazon during the GoAmazon campaign

Roger Seco, University of California Irvine, Irvine, CA, United States, Saewung Kim, University of California Irvine, Department of Earth System Science, Irvine, United States, Jeong-Hoo Park, National Center for Atmospheric Research, Boulder, CO, United States, Alex B Guenther, University of California Irvine, Department of Earth System Science, Irvine, CA, United States, James N Smith, University of California Irvine, Department of Chemistry, Irvine, United States, Yingjun Liu, Harvard University, Cambridge, United States, Jose Oscar Vega Bustillos, IPEN Nuclear Energy Research Institute, Sao Paulo, Brazil, Julio Tota, UEA / INPA / SUNY, Manaus, Brazil, Rodrigo Augusto Ferreira de Souza, Universidade do Estado do Amazonas, Manaus, Brazil, Scot T Martin, Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA, United States and GoAmazon science team
Abstract:
Atmospheric volatile organic compounds (VOCs) have key environmental and biological roles, and can affect atmospheric chemisty, secondary aerosol formation, and also regional climate. Observations at the T3 site in Manacapuru, Brazil during the GoAmazon campaign included measurements of VOCs in pristine to polluted air of the Amazon basin, depending upon the influences from the pollution plumes from the city of Manaus. The observational dataset using the Switchable Reagent Ion (SRI) ToF-MS will be presented to discuss isoprene oxidation processes in a wide spectrum of anthropogenic influences. The SRI capability was utilized to quantify ratios of Methyl Vinyl Ketone to Methacrolein in order to examine isoprene peroxy radical reaction pathways as a function of NO levels. A discussion about temporal variations in C5 multifunctional isoprene oxidation products, which is determined using the ToF technology, will be also presented in the same context.
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