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| Titel |
Precision measurement with a DMA-train of the initial growth of biogenic
nanoparticles in CLOUD |
| VerfasserIn |
Dominik Stolzenburg, Sophia Brilke, Bernhard Baumgartner, Paul Winkler |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250144936
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| Publikation (Nr.) |
 EGU/EGU2017-8818.pdf |
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| Zusammenfassung |
| New particle formation is widely observed in the atmosphere (Kulmala et al., 2004) and 50 %
of the global budget of cloud condensation nuclei may originate from this process (Merikanto
et al., 2009). Nucleation at the critical cluster size between 1-2 nm is often followed by rapid
growth to sizes larger than 50 nm. Especially fast initial growth rates between 2-10 nm are
crucial for the survival of the newly formed particles, because losses to pre-existing aerosol
are high. The precise quantification of the conditions which cause initial growth are key to the
understanding of the influence of new particle formation on the global climate (Tröstl et al.,
2016).
A DMA-train (Stolzenburg et al., 2016) is used for precision quantification of biogenic
new particle formation in the CLOUD experiment at CERN (Kirkby et al., 2016). The
DMA-train combines the precision of electrical mobility analysis with high sensitivity, by the
use of six differential mobility analysers operated in parallel at distinct sizes and
state-of-the-art condensation particle counters.
Under precisely controlled chamber conditions and with extremely low contaminant
levels, we quantify the temperature dependence of particle growth with highly oxygenated
molecules (HOMs) produced by α-pinene ozonolysis (Tröstl et al. (2016) reported initial
measurements at a single temperature of 5oC). Moreover, we report the impact of isoprene
and sulfuric acid contamination on the growth rates. By combination with other
state-of-the-art instruments, the size-dependence of the growth rates can be determined from
cluster sizes up to 100 nm. We therefore present the most detailed growth rate measurements
obtained so far by CLOUD.
Kirkby, J. et al.: Ion-induced nucleation of pure biogenic particles, Nature, 533, 521–526,
2016.
Kulmala, M. et al.: Formation and growth rates of ultrafine atmospheric particles: a
review of observations, J. Aerosol Sci., 35, 143–176, 2004.
Merikanto, J. et al.: Impact of nucleation on global CCN, Atmos. Chem. Phys., 9,
8601–8616, 2009.
Tröstl, J. et al.: The role of low-volatility organic compounds in initial particle growth in
the atmosphere, Nature, 533, 527–531, 2016.
Stolzenburg, D. et al.: A DMA-train for precision measurement of sub 10-nm
aerosol dynamics, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-346, 2016. |
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