Methylamine’s Effects on Methylglyoxal-Containing
Aerosol: Chemical, Physical, and Optical Changes
Version 2 2019-08-07, 18:45
Version 1 2019-08-07, 18:38
Posted on 2019-08-07 - 18:45
Methylamine, a common
atmospheric amine species, is found in the
gas, particle, and aqueous phases. It has been shown to form light-absorbing,
oligomeric species in reactions with methylglyoxal and other aldehyde
species in bulk aqueous-phase experiments and when mixed into seed
aerosol as a sulfate salt. Here, we explore the influence of multiphase
methylamine chemistry on aerosol production, properties, and molecular
composition. When methylglyoxal aerosol particles were exposed to
∼2 ppm methylamine gas in a humid chamber, rapid browning was
observed, but not growth. Aerosol bounce measurements indicated that
particles became slightly more viscous and hydrophobic upon methylamine
exposure. Subsequent cloud processing increased both viscosity and
hygroscopicity but had little effect on browning, consistent with
high-resolution mass spectrometry results showing that aerosol oligomer
dicarbonyl functional groups were transformed into cationic imidazole
rings. Photolytic cloud processing triggered the incorporation of
hydroxyacetone and acetal radicals into oligomers. Because dicarbonyl
species are a major component of atmospheric aerosol particles, these
results suggest that methylamine exposure and cloud processing will
slowly increase brown carbon content, viscosity, and hygroscopicity
of atmospheric aerosol.
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O. De Haan, David; Pajunoja, Aki; Hawkins, Lelia N.; Welsh, Hannah G.; Jimenez, Natalie G.; De Loera, Alexia; et al. (2019). Methylamine’s Effects on Methylglyoxal-Containing
Aerosol: Chemical, Physical, and Optical Changes. ACS Publications. Collection. https://doi.org/10.1021/acsearthspacechem.9b00103
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AUTHORS (18)
DO
David O. De Haan
AP
Aki Pajunoja
LH
Lelia N. Hawkins
HW
Hannah G. Welsh
NJ
Natalie G. Jimenez
AD
Alexia De Loera
MZ
Melanie Zauscher
AA
Alyssa D. Andretta
BJ
Benjamin W. Joyce
AD
Audrey C. De Haan
MR
Matthieu Riva
TC
Tianqu Cui
JS
Jason D. Surratt
MC
Matthieu Cazaunau
PF
Paola Formenti
AG
Aline Gratien
EP
Edouard Pangui
JD
Jean-François Doussin