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| Titel |
Modeling the evolution of aerosol particles in a ship plume using PartMC-MOSAIC |
| VerfasserIn |
J. Tian, N. Riemer, M. West, L. Pfaffenberger, H. Schlager, A. Petzold |
| 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 ; 14, no. 11 ; Nr. 14, no. 11 (2014-06-03), S.5327-5347 |
| Datensatznummer |
250118762
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| Publikation (Nr.) |
 copernicus.org/acp-14-5327-2014.pdf |
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| Zusammenfassung |
| This study investigates the evolution of ship-emitted aerosol
particles using the stochastic particle-resolved model
PartMC-MOSAIC (Particle Monte Carlo model-Model for Simulating Aerosol Interactions and Chemistry). Comparisons of our results with observations from the
QUANTIFY (Quantifying the Climate Impact of Global
and European Transport Systems) study in 2007 in the English Channel and the Gulf of Biscay
showed that the model was able to reproduce the observed evolution
of total number concentration and the vanishing of the nucleation
mode consisting of sulfate particles. Further process analysis
revealed that during the first hour after emission, dilution reduced
the total number concentration by four orders of magnitude, while
coagulation reduced it by an additional order of
magnitude. Neglecting coagulation resulted in an overprediction of
more than one order of magnitude in the number concentration of
particles smaller than 40 nm at a plume age of 100 s. Coagulation
also significantly altered the mixing state of the particles,
leading to a continuum of internal mixtures of sulfate and black
carbon. The impact on cloud condensation nuclei (CCN) concentrations
depended on the supersaturation threshold S at which CCN activity
was evaluated. For the base case conditions, characterized
by a low formation rate of secondary aerosol species, neglecting
coagulation, but simulating condensation, led to an
underestimation of CCN concentrations of about 37% for S = 0.3%
at the end of the 14-h simulation. In contrast, for
supersaturations higher than 0.7%, neglecting coagulation
resulted in an overestimation of CCN concentration, about 75% for
S = 1%. For S lower than 0.2% the differences between
simulations including coagulation and neglecting coagulation were
negligible. Neglecting condensation, but simulating coagulation
did not impact the CCN concentrations below 0.2% and resulted in
an underestimation of CCN concentrations for larger
supersaturations, e.g., 18% for S = 0.6%. We also explored the
role of nucleation for the CCN concentrations in the ship
plume. For the base case the impact of nucleation on CCN
concentrations was limited, but for a sensitivity case with higher
formation rates of secondary aerosol over several hours, the CCN
concentrations increased by an order of magnitude for
supersaturation thresholds above 0.3%. |
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