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| Titel |
Evidence of an elevated source of nucleation based on model simulations and data from the NIFTy experiment |
| VerfasserIn |
P. Crippa, T. Petäjä, H. Korhonen, G. S. El Afandi, S. C. Pryor |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 17 ; Nr. 12, no. 17 (2012-09-10), S.8021-8036 |
| Datensatznummer |
250011432
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| Publikation (Nr.) |
 copernicus.org/acp-12-8021-2012.pdf |
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| Zusammenfassung |
| New particle formation has been observed at a number of ground-based
measurement sites. Prior research has provided evidence that this new
particle formation, while observed in the near-surface layer, is actually
occurring in atmospheric layers above the surface and appears to be focused
in or close to the residual layer formed by the nocturnal inversion. Here,
we present both observations and modeling for southern Indiana which support
this postulate. Based on simulations with a detailed aerosol dynamics model
and the Weather Research and Forecasting model, along with data from
ground-based remote sensing instruments and detailed gas and particle phase
measurements, we show evidence that (i) the maximum rate change of ultrafine
particle concentrations as observed close to the surface is always preceded
by breakdown of the nocturnal inversion and enhancement of vertical mixing
and (ii) simulated particle size distributions exhibit greatest accord with
surface observations during and subsequent to nucleation only when
initialized with a particle size distribution representative of clear
atmospheric conditions, rather than the in situ (ground-level) particle size
distribution. |
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