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| Titel |
Intercomparison and evaluation of global aerosol microphysical properties among AeroCom models of a range of complexity |
| VerfasserIn |
G. W. Mann, K. S. Carslaw, C. L. Reddington, K. J. Pringle, M. Schulz, A. Asmi, D. V. Spracklen, D. A. Ridley, M. T. Woodhouse, L. A. Lee, K. Zhang, S. J. Ghan, R. C. Easter, X. Liu, P. Stier, Y. H. Lee, P. J. Adams, H. Tost, J. Lelieveld  , S. E. Bauer, K. Tsigaridis, T. P. C. van Noije, A. Strunk, E. Vignati, N. Bellouin, M. Dalvi, C. E. Johnson, T. Bergman, H. Kokkola, K. von Salzen, F. Yu, G. Luo, A. Petzold, J. Heintzenberg, A. Clarke, J. A. Ogren, J. Gras, U. Baltensperger, U. Kaminski, S. G. Jennings, C. D. O'Dowd, R. M. Harrison, D. C. S. Beddows, M. Kulmala , Y. Viisanen, V. Ulevicius, N. Mihalopoulos, V. Ždímal, M. Fiebig, H.-C. Hansson, E. Swietlicki, J. S. Henzing |
| 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. 9 ; Nr. 14, no. 9 (2014-05-13), S.4679-4713 |
| Datensatznummer |
250118696
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| Publikation (Nr.) |
 copernicus.org/acp-14-4679-2014.pdf |
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| Zusammenfassung |
| Many of the next generation of global climate models will include
aerosol schemes which explicitly simulate the microphysical
processes that determine the particle size distribution. These
models enable aerosol optical properties and cloud condensation
nuclei (CCN) concentrations to be determined by fundamental aerosol
processes, which should lead to a more physically based simulation
of aerosol direct and indirect radiative forcings. This study
examines the global variation in particle size distribution
simulated by 12 global aerosol microphysics models to quantify
model diversity and to identify any common biases against
observations. Evaluation against size distribution measurements
from a new European network of aerosol supersites shows that the
mean model agrees quite well with the observations at many sites on
the annual mean, but there are some seasonal biases common to many
sites. In particular, at many of these European sites, the
accumulation mode number concentration is biased low during winter
and Aitken mode concentrations tend to be overestimated in winter
and underestimated in summer. At high northern latitudes, the models
strongly underpredict Aitken and accumulation particle
concentrations compared to the measurements, consistent with
previous studies that have highlighted the poor performance of
global aerosol models in the Arctic. In the marine boundary layer,
the models capture the observed meridional variation in the size
distribution, which is dominated by the Aitken mode at high
latitudes, with an increasing concentration of accumulation
particles with decreasing latitude. Considering vertical profiles,
the models reproduce the observed peak in total particle
concentrations in the upper troposphere due to new particle
formation, although modelled peak concentrations tend to be biased
high over Europe. Overall, the multi-model-mean data set simulates
the global variation of the particle size distribution with a good
degree of skill, suggesting that most of the individual global
aerosol microphysics models are performing well, although the large
model diversity indicates that some models are in poor agreement
with the observations. Further work is required to better constrain
size-resolved primary and secondary particle number sources, and an
improved understanding of nucleation and growth (e.g. the role of
nitrate and secondary organics) will improve the fidelity of
simulated particle size distributions. |
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