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| Titel |
New trajectory-driven aerosol and chemical process model Chemical and Aerosol Lagrangian Model (CALM) |
| VerfasserIn |
P. Tunved, D. G. Partridge, H. Korhonen |
| 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 ; 10, no. 21 ; Nr. 10, no. 21 (2010-11-01), S.10161-10185 |
| Datensatznummer |
250008860
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| Publikation (Nr.) |
 copernicus.org/acp-10-10161-2010.pdf |
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| Zusammenfassung |
| A new Chemical and Aerosol Lagrangian Model (CALM) has been developed and
tested. The model incorporates all central aerosol dynamical processes, from
nucleation, condensation, coagulation and deposition to cloud formation and
in-cloud processing. The model is tested and evaluated against observations
performed at the SMEAR II station located at Hyytiälä
(61° 51' N, 24° 17' E) over a time period of two
years, 2000–2001. The model shows good agreement with measurements
throughout most of the year, but fails in reproducing the aerosol properties
during the winter season, resulting in poor agreement between model and
measurements especially during December–January. Nevertheless, through the
rest of the year both trends and magnitude of modal concentrations show good
agreement with observation, as do the monthly average size distribution
properties. The model is also shown to capture individual nucleation events
to a certain degree. This indicates that nucleation largely is controlled by
the availability of nucleating material (as prescribed by the
[H2SO4]), availability of condensing material (in this model 15%
of primary reactions of monoterpenes (MT) are assumed to produce low volatile
species) and the properties of the size distribution (more specifically, the
condensation sink). This is further demonstrated by the fact that the model
captures the annual trend in nuclei mode concentration. The model is also
used, alongside sensitivity tests, to examine which processes dominate the
aerosol size distribution physical properties. It is shown, in agreement with
previous studies, that nucleation governs the number concentration during
transport from clean areas. It is also shown that primary number emissions
almost exclusively govern the CN concentration when air from Central Europe
is advected north over Scandinavia. We also show that biogenic emissions have
a large influence on the amount of potential CCN observed over the boreal
region, as shown by the agreement between observations and modeled results
for the receptor SMEAR II, Hyytiälä, during the studied
period. |
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