monoterpene new particle formation events’ contribution ... · ccn = particles that can activate...
TRANSCRIPT
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Monoterpene New Particle Formation Events’
Contribution to CCN in the Boreal Forrest and Globally
Lexie Goldberger ATMS 591
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Stations Measuring Atmosphere Ecosystem Relationships II (SMEAR
II), Hyytiälä Finland
• SMEAR field station of the Atmospheric Research Center and the Department of Physics of the University of Helsinki
• DMPS (Differential Mobility Particle Sizer)
SMEAR
SMEAR
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Boreal Forrest
Monoterpenes, C10H16
Station Conditions
Wikipedia
SMEAR data
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Köhler curve dependence on composition versus size
Köhler curve for ammonium sulfate particles and various hygroscopicity (Farmer et al. 2014) (Dusek et al. 2006)
Köhler curves for ammonium sulfate particles (similar molar mass to monoterpenes) with dry particle diameters ranging from 10 to 490 nm, in 20 nm steps. Critical supersaturation is the percent supersaturation at the maximum of each curve. The line color indicates the particle dry diameter. The gray-filled region indicates where s < 1.0% and the yellow-filled region where s < 0.3%. Note the decrease in the critical supersaturation with increasing particle size. (B) Köhler curves for particles with 80 nm dry diameters but differing composition. Particles have been chosen to represent highly hygroscopic (NaCl), very hygroscopic (ammonium sulfate), moderately hygroscopic (oxidized organic aerosol), weakly hygroscopic (primary organic aerosol), and non-hygroscopic (black carbon) materials.
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What are CCN
CCN = particles that can activate at a given supersaturation
CCN dependent on both size and composition
For this project I use Dp=48nm as the cut off size for CCN based off literature values (Varutbangkul et al. 2006 for S=1%, monoterpene can be treated as a highly water-soluble organic) This can be justified using the Köhler curve on the previous page.
for a given aerosol population with a uniform, size-independent composition, number density of CCN activated:
CCN(s)=∫[Ds:∞] n(Dp)dDp, where n(Dp) is number distribution and Ds is the activation diameter for s% supersaturation for these particles
simplified: CCN(s)=cs^k, for continental aerosols assuming a supersaturation of .4% for low clouds, CCN(.4%) = 600*0.4^.5 = 379.5 cm^-3, (values from Hegg and Hobbs 1992)
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Banana Plots
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Banana Plot Zoom
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Change in CCNCCN(1.0%)
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Particle Size Distribution
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Growth of Particles
Linear Growth Rate, (*accumulation of mass is exponential)
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Effect of SOA, ELVOC, and isoprene on annual average CN, CCN(1.0%), and
CCN(0.2%)
Jokinen et al. 2015
ELVOC promote aerosol particle
formation and CCN production in the
atmosphere. Monoterpenes with
their endocyclic double bound readily produce ELVOC from
ozonolysis.
Monoterpene oxidation products
enhance atmospheric new particle
formation and growth in continental regions,
increasing CCN concentrations.
Isoprene derived SOA suppresses
atmospheric new particle formation but assists in the growth
of sub-CCN-size primary particles to
CCN