Articles | Volume 18, issue 16
Atmos. Chem. Phys., 18, 12413–12431, 2018
https://doi.org/10.5194/acp-18-12413-2018
Atmos. Chem. Phys., 18, 12413–12431, 2018
https://doi.org/10.5194/acp-18-12413-2018

Research article 28 Aug 2018

Research article | 28 Aug 2018

Evidence for pyrazine-based chromophores in cloud water mimics containing methylglyoxal and ammonium sulfate

Lelia Nahid Hawkins et al.

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Cited articles

Adams, A., Polizzi, V., van Boekel, M., and De Kimpe, N.: Formation of pyrazines and a novel pyrrole in Maillard model systems of 1, 3-dihydroxyacetone and 2-oxopropanal, J. Agr. Food Chem., 56, 2147–2153, 2008.
Aiona, P. K., Lee, H. J., Leslie, R., Lin, P., Laskin, A., Laskin, J., and Nizkorodov, S. A.: Photochemistry of Products of the Aqueous Reaction of Methylglyoxal with Ammonium Sulfate, ACS Earth and Space Chemistry, 1, 522–532, 2017a.
Aiona, P. K., Lee, H. J., Lin, P., Heller, F., Laskin, A., Laskin, J., and Nizkorodov, S. A.: A Role for 2-Methyl Pyrrole in the Browning of 4-Oxopentanal and Limonene Secondary Organic Aerosol, Environ. Sci. Technol., 51, 11048–11056, 2017b.
Baduel, C., Voisin, D., and Jaffrezo, J.-L.: Seasonal variations of concentrations and optical properties of water soluble HULIS collected in urban environments, Atmos. Chem. Phys., 10, 4085–4095, https://doi.org/10.5194/acp-10-4085-2010, 2010.
Bahadur, R., Praveen, P. S., Xu, Y., and Ramanathan, V.: Solar absorption by elemental and brown carbon determined from spectral observations, P. Natl. Acad. Sci. USA, 109, 17366–17371, 2012.
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Atmospheric reactions can change the color of particles; this has implications for global climate. We present evidence of pyrazine compounds in cloud water mimics. We measured changes in brownness and composition during evaporation and acidity changes to understand the importance of the new compounds because the reactions parallel browning in foods. Drying favors browning and pyrazine formation, while acidity favors only pyrazine formation. Even acidic cloud water, when dried, produce pyrazines.
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