vertically resolved concentration and liquid water content of atmospheric nanoparticles at the us doe southern great plains site
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2018
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Abstract
Most prior field studies of new particle formation (NPF) have been performed
at or near ground level, leaving many unanswered questions regarding the
vertical extent of NPF. To address this, we measured concentrations of 11–16 nm
diameter particles from ground level to 1000 m during the 2013
New Particle Formation Study at the Atmospheric Radiation Measurement
Southern Great Plains site in Lamont, Oklahoma. The measurements were
performed using a tethered balloon carrying two condensation particle
counters that were configured for two different particle cut-off diameters.
These observations were compared to data from three scanning mobility
particle sizers at the ground level. We observed that 11–16 nm diameter
particles were generated at the top region of the boundary layer, and were
then rapidly mixed throughout the boundary layer. We also estimate liquid
water content of nanoparticles using ground-based measurements of particle
hygroscopicity obtained with a Humidified Tandem Differential Mobility
Analyzer and vertically resolved relative humidity (RH) and temperature
measured with a Raman lidar. Our analyses of these observations lead to the
following conclusions regarding nanoparticles formed during NPF events at
this site: (1) ground-based observations may not always accurately represent
the timing, distribution, and meteorological conditions associated with the
onset of NPF; (2) nanoparticles are highly hygroscopic and typically contain
up to 50 % water by volume, and during conditions of high RH combined with
high particle hygroscopicity, particles can be up to 95 % water by volume;
(3) increased liquid water content of nanoparticles at high RH greatly
enhances the partitioning of water-soluble species like organic acids into
ambient nanoparticles.
| Reference Key |
chen2018atmosphericvertically
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|---|---|
| Authors | ;H. Chen;A. L. Hodshire;J. Ortega;J. Greenberg;P. H. McMurry;A. G. Carlton;J. R. Pierce;D. R. Hanson;J. N. Smith |
| Journal | Journal of agricultural and food chemistry |
| Year | 2018 |
| DOI |
10.5194/acp-18-311-2018
|
| URL | |
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