measurement, growth types and shrinkage of newly formed aerosol particles at an urban research platform
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ID: 234899
2016
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Abstract
Budapest platform for
Aerosol Research and Training (BpART) was created for advancing long-term
on-line atmospheric measurements and intensive aerosol sample collection
campaigns in Budapest. A joint study including atmospheric chemistry or
physics, meteorology, and fluid dynamics on several-year-long data sets
obtained at the platform confirmed that the location represents a well-mixed,
average atmospheric environment for the city centre. The air streamlines
indicated that the host and neighbouring buildings together with the natural
orography play an important role in the near-field dispersion processes.
Details and features of the airflow structure were derived, and they can be
readily utilised for further interpretations. An experimental method to
determine particle diffusion losses in the differential mobility particle
sizer (DMPS) system of the BpART facility was proposed. It is based on
CPC–CPC (condensation particle counter) and
DMPS–CPC comparisons. Growth types of nucleated
particles observed in 4 years of measurements were presented and discussed
specifically for cities. Arch-shaped size distribution surface plots
consisting of a growth phase followed by a shrinkage phase were characterised
separately since they supply information on nucleated particles. They were
observed in 4.5 % of quantifiable nucleation events. The shrinkage phase
took 1 h 34 min in general, and the mean shrinkage rate with standard
deviation was −3.8 ± 1.0 nm h−1. The shrinkage of particles
was mostly linked to changes in local atmospheric conditions, especially in
global radiation and the gas-phase H2SO4 concentration through its
proxy, or to atmospheric mixing in few cases. Some indirect results indicate
that variations in the formation and growth rates of nucleated particles
during their atmospheric transport could be a driving force of shrinkage for
particles of very small sizes and on specific occasions.
| Reference Key |
salma2016atmosphericmeasurement,
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|---|---|
| Authors | ;I. Salma;Z. Németh;T. Weidinger;B. Kovács;G. Kristóf |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-7837-2016
|
| URL | |
| Keywords |
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