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Discussion papers
https://doi.org/10.5194/acp-2018-752
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-752
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 26 Jul 2018

Research article | 26 Jul 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Comprehensive organic emission profiles for gasoline, diesel, and gas-turbine engines including intermediate and semi-volatile organic compound emissions

Quanyang Lu1,2, Yunliang Zhao1,2,a, and Allen L. Robinson1,2 Quanyang Lu et al.
  • 1Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
  • 2Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
  • anow at: California Air Resources Board, Sacramento, California 95814, United States

Abstract. Emissions from mobile sources are important contributors to both primary and secondary organic aerosols (POA and SOA) in urban environments. We compiled recently published data to create comprehensive model-ready organic emission profiles for on- and off-road gasoline, gas-turbine, and diesel engines. The profiles span the entire volatility range, including volatile organic compounds (VOCs, effective saturation concentration C*=107–1011µg/m3), intermediate-volatile organic compounds (IVOCs, C*=103–106µg/m3), semi-volatile organic compounds (SVOCs, C*=1–102µg/m3), low-volatile organic compounds (LVOCs, C*0.1µg/m3) and non-volatile organic compounds (NVOCs). Organic emissions from all three source categories feature tri-modal volatility distributions ("by-product" mode, "fuel" mode, and "lubricant oil" mode). Despite wide variations in emission factors for total organics, the mass fractions of IVOCs and SVOCs are relatively consistent across sources using the same fuel type; for example, contributing 4.5% (2.4–9.6% as 10th to 90th percentile) and 1.1% (0.4–3.6%) for gasoline engine emissions, respectively. This suggests that a single profile can be used to represent the emissions from sources operating on the same fuel. Gasoline and gas-turbine emissions are enriched in IVOCs relative to unburned fuel. The new profiles predict that IVOCs and SVOC vapor contribute significantly to SOA production. We compare our new profiles to traditional source profiles and various scaling approach used previously to estimate IVOC emissions. These comparisons reveal large errors in these different approaches ranging from failure to account for IVOC emissions (traditional source profiles) to assuming source-invariant scaling ratios (most IVOC scaling approaches). The profiles are designed to be directly implemented into chemical transport models and inventories.

Quanyang Lu et al.
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Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Quanyang Lu et al.
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Short summary
This work combines previously published data to illustrate the mechanics of emission from internal combustion engine sources. Engine exhaust can be decomposed to combustion "by-product", "unburned fuel" and "oil" modes. Intermediate and semi-volatile organic compounds are included to create comprehensive model-ready organic emission profiles. Gasoline and gas-turbine engine emissions are enriched in intermediate volatile organic compounds relative to unburned fuel.
This work combines previously published data to illustrate the mechanics of emission from...
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