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Significant Contributions of Isoprene to Summertime Secondary Organic Aerosol in Eastern United States.
Environ Sci Technol. 2015 Jul 07; 49(13):7834-42.ES

Abstract

A modified SAPRC-11 (S11) photochemical mechanism with more detailed treatment of isoprene oxidation chemistry and additional secondary organic aerosol (SOA) formation through surface-controlled reactive uptake of dicarbonyls, isoprene epoxydiol and methacrylic acid epoxide was incorporated in the Community Multiscale Air Quality Model (CMAQ) to quantitatively determine contributions of isoprene to summertime ambient SOA concentrations in the eastern United States. The modified model utilizes a precursor-origin resolved approach to determine secondary glyoxal and methylglyoxal produced by oxidation of isoprene and other major volatile organic compounds (VOCs). Predicted OC concentrations show good agreement with field measurements without significant bias (MFB ∼ 0.07 and MFE ∼ 0.50), and predicted SOA reproduces observed day-to-day and diurnal variation of Oxygenated Organic Aerosol (OOA) determined by an aerosol mass spectrometer (AMS) at two locations in Houston, Texas. On average, isoprene SOA accounts for 55.5% of total predicted near-surface SOA in the eastern U.S., followed by aromatic compounds (13.2%), sesquiterpenes (13.0%) and monoterpenes (10.9%). Aerosol surface uptake of isoprene-generated glyoxal, methylglyoxal and epoxydiol accounts for approximately 83% of total isoprene SOA or more than 45% of total SOA. A domain wide reduction of NOx emissions by 40% leads to a slight decrease of domain average SOA by 3.6% and isoprene SOA by approximately 2.6%. Although most of the isoprene SOA component concentrations are decreased, SOA from isoprene epoxydiol is increased by ∼16%.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

26029963

Citation

Ying, Qi, et al. "Significant Contributions of Isoprene to Summertime Secondary Organic Aerosol in Eastern United States." Environmental Science & Technology, vol. 49, no. 13, 2015, pp. 7834-42.
Ying Q, Li J, Kota SH. Significant Contributions of Isoprene to Summertime Secondary Organic Aerosol in Eastern United States. Environ Sci Technol. 2015;49(13):7834-42.
Ying, Q., Li, J., & Kota, S. H. (2015). Significant Contributions of Isoprene to Summertime Secondary Organic Aerosol in Eastern United States. Environmental Science & Technology, 49(13), 7834-42. https://doi.org/10.1021/acs.est.5b02514
Ying Q, Li J, Kota SH. Significant Contributions of Isoprene to Summertime Secondary Organic Aerosol in Eastern United States. Environ Sci Technol. 2015 Jul 7;49(13):7834-42. PubMed PMID: 26029963.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Significant Contributions of Isoprene to Summertime Secondary Organic Aerosol in Eastern United States. AU - Ying,Qi, AU - Li,Jingyi, AU - Kota,Sri Harsha, Y1 - 2015/06/11/ PY - 2015/6/2/entrez PY - 2015/6/2/pubmed PY - 2016/2/9/medline SP - 7834 EP - 42 JF - Environmental science & technology JO - Environ Sci Technol VL - 49 IS - 13 N2 - A modified SAPRC-11 (S11) photochemical mechanism with more detailed treatment of isoprene oxidation chemistry and additional secondary organic aerosol (SOA) formation through surface-controlled reactive uptake of dicarbonyls, isoprene epoxydiol and methacrylic acid epoxide was incorporated in the Community Multiscale Air Quality Model (CMAQ) to quantitatively determine contributions of isoprene to summertime ambient SOA concentrations in the eastern United States. The modified model utilizes a precursor-origin resolved approach to determine secondary glyoxal and methylglyoxal produced by oxidation of isoprene and other major volatile organic compounds (VOCs). Predicted OC concentrations show good agreement with field measurements without significant bias (MFB ∼ 0.07 and MFE ∼ 0.50), and predicted SOA reproduces observed day-to-day and diurnal variation of Oxygenated Organic Aerosol (OOA) determined by an aerosol mass spectrometer (AMS) at two locations in Houston, Texas. On average, isoprene SOA accounts for 55.5% of total predicted near-surface SOA in the eastern U.S., followed by aromatic compounds (13.2%), sesquiterpenes (13.0%) and monoterpenes (10.9%). Aerosol surface uptake of isoprene-generated glyoxal, methylglyoxal and epoxydiol accounts for approximately 83% of total isoprene SOA or more than 45% of total SOA. A domain wide reduction of NOx emissions by 40% leads to a slight decrease of domain average SOA by 3.6% and isoprene SOA by approximately 2.6%. Although most of the isoprene SOA component concentrations are decreased, SOA from isoprene epoxydiol is increased by ∼16%. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/26029963/Significant_Contributions_of_Isoprene_to_Summertime_Secondary_Organic_Aerosol_in_Eastern_United_States_ L2 - https://doi.org/10.1021/acs.est.5b02514 DB - PRIME DP - Unbound Medicine ER -