Atmospheric Chemistry and Physics Discussions
www.atmos-chem-phys-discuss.net
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7
6
2007
10.5194/acpd-7-17705-2007
http://www.atmos-chem-phys-discuss.net/7/17705/2007/
http://www.atmos-chem-phys-discuss.net/7/17705/2007/acpd-7-17705-2007.html
http://www.atmos-chem-phys-discuss.net/7/17705/2007/acpd-7-17705-2007.pdf
17705
17739
2007-12-10
SALSA – a Sectional Aerosol module for Large Scale Applications
H. Kokkola
H. Korhonen
K. E. J. Lehtinen
R. Makkonen
A. Asmi
S. Järvenoja
T. Anttila
A.-I. Partanen
M. Kulmala
H. Järvinen
A. Laaksonen
V.-M. Kerminen
Finnish Meteorological Institute, Kuopio Unit, P.O. Box 1627, 70211 Kuopio, Finland
Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
Department of Physics, Univ. of Kuopio, P.O. Box 1672, 70211 Kuopio, Finland
Department of Physical Sciences, P.O. Box 64, 00014 Univ. of Helsinki, Finland
deceased
The sectional aerosol module SALSA is introduced.
The model has been designed to be implemented in large
scale climate models, which require both accuracy and computational
efficiency. We have used multiple methods to reduce the computational
burden of different aerosol processes to optimize the model
performance without losing physical features relevant to problematics of
climate importance. The optimizations include limiting the chemical compounds
and physical processes available in different size sections of aerosol particles;
division of the size distribution into size sections
using size sections of variable width depending on the sensitivity of
microphysical processing to the particles sizes; the total amount of size sections
to describe the size distribution is kept to the minimum; furthermore, only
the relevant microphysical processes affecting each size section are
calculated. The ability of the module to describe different
microphysical processes was evaluated against explicit microphysical
models and several microphysical models used in air quality
models. The results from the current module show good consistency when
compared to more explicit models. Also, the module was used to simulate a
new particle formation event typical in highly polluted conditions
with comparable results to a more explicit model setup.
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