UNC-Chapel Hill ENVR 890 - Predicted Secondary Organic Aerosol Concentrations from the Oxidation of Isoprene in the Eastern US (7 pages)

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Predicted Secondary Organic Aerosol Concentrations from the Oxidation of Isoprene in the Eastern US



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Predicted Secondary Organic Aerosol Concentrations from the Oxidation of Isoprene in the Eastern US

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Lecture Notes


Pages:
7
School:
University of North Carolina at Chapel Hill
Course:
Envr 890 - SPECIAL TOPICS/ESE Lecture 1 - 21
SPECIAL TOPICS/ESE Lecture 1 - 21 Documents

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Environ Sci Technol 2007 41 3984 3990 Predicted Secondary Organic Aerosol Concentrations from the Oxidation of Isoprene in the Eastern United States TIMOTHY E LANE AND S P Y R O S N P A N D I S Department of Chemical Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 and Department of Chemical Engineering University of Patras Patra 26500 Greece Isoprene the most abundant non methane hydrocarbon emitted into the troposphere has generally not been considered a major source of SOA due to the relatively high volatility of its oxidation products In this study the SOA formed from the oxidation of isoprene is predicted using a three dimensional chemical transport model PMCAMx across the eastern U S for July October January and April 2001 2002 The variability of the measured SOA yields in the available smog chamber studies is captured by combining the base case scenario with upper and lower bound estimates of the measurements For the base case simulation the predicted annual average isoprene SOA concentration in the southeast is 0 09 g m 3 bounds 0 04 0 23 g m 3 Isoprene is predicted to produce 70 less SOA across the entire domain for spring and fall than during the summer and negligible amounts of SOA during the winter During the summer the average concentrations in the northeast are predicted to be 0 11 g m 3 bounds 0 040 31 g m 3 and in the southeast 0 19 g m 3 bounds 0 110 58 g m 3 PMCAMx predictions are compared to available measurements of some isoprene SOA components in North Carolina and New York State These modeling results suggest that on an annual basis isoprene oxidation is a small but non negligible organic aerosol source in the eastern U S Its contribution is relatively more important during the summer and in the southeast U S 1 Introduction Several recent studies have suggested that isoprene may be an important source of SOA 1 3 Claeys et al 1 measured significant concentrations of tetrols in the Amazon and provided strong evidence that



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