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Global-scale combustion sources of organic aerosols: sensitivity to formation and removal mechanisms

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Tsimpidi,  A.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Karydis,  V.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Lelieveld,  J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Tsimpidi, A., Karydis, V., Pandis, S. N., & Lelieveld, J. (2017). Global-scale combustion sources of organic aerosols: sensitivity to formation and removal mechanisms. Atmospheric Chemistry and Physics, 17(12), 7345-7364. doi:10.5194/acp-17-7345-2017.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-9848-0
Abstract
Organic compounds from combustion sources such as biomass burning and fossil fuel use are major contributors to the global atmospheric load of aerosols. We analyzed the sensitivity of model-predicted global-scale organic aerosols (OA) to parameters that control primary emissions, photochemical aging, and the scavenging efficiency of organic vapors. We used a computationally efficient module for the description of OA composition and evolution in the atmosphere (ORACLE) of the global chemistry–climate model EMAC (ECHAM/MESSy Atmospheric Chemistry). A global dataset of aerosol mass spectrometer (AMS) measurements was used to evaluate simulated primary (POA) and secondary (SOA) OA concentrations. Model results are sensitive to the emission rates of intermediate-volatility organic compounds (IVOCs) and POA. Assuming enhanced reactivity of semi-volatile organic compounds (SVOCs) and IVOCs with OH substantially improved the model performance for SOA. The use of a hybrid approach for the parameterization of the aging of IVOCs had a small effect on predicted SOA levels. The model performance improved by assuming that freshly emitted organic compounds are relatively hydrophobic and become increasingly hygroscopic due to oxidation.