Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
6
12
2006
10.5194/acp-6-4499-2006
http://www.atmos-chem-phys.net/6/4499/2006/
http://www.atmos-chem-phys.net/6/4499/2006/acp-6-4499-2006.html
http://www.atmos-chem-phys.net/6/4499/2006/acp-6-4499-2006.pdf
4499
4517
2006-10-06
MALTE – model to predict new aerosol formation in the lower troposphere
M. Boy
michael.boy@helsinki.fi
O. Hellmuth
H. Korhonen
E. D. Nilsson
D. ReVelle
A. Turnipseed
F. Arnold
M. Kulmala
Department of Physical Sciences, Division of Atmospheric Sciences, P.O. Box 64, 00014 University of Helsinki, Finland
ASP/ACD, NCAR, P.O. Box 3000, 80305 Boulder, Colorado, USA
Leibniz Institute for Tropospheric Research, Permoserstrasse 15, 04318 Leipzig, Germany
Finnish Meteorological Institute, Air Quality Research, Sahaajankatu 20 E, 00880 Helsinki, Finland
Department of Meteorology, Stockholm University, 106 91 Stockholm, Sweden
Earth and Environmental Sciences, Los Alamos National Lab., P.O. Box 1663, MS D401, Los Alamos, NM, 87545 USA
ACD, NCAR, P.O. Box 3000, 80305 Boulder, Colorado, USA
Atmospheric Physics Division, Max-Planck Institute for Nuclear Physics (MPIK), P.O. Box 103980, 69029 Heidelberg, Germany
The manuscript presents a detailed description of the meteorological and
chemical code of Malte – a model to predict new aerosol formation in the
lower troposphere. The aerosol dynamics are achieved by the new developed
UHMA (University of Helsinki Multicomponent Aerosol Model) code with kinetic
limited nucleation as responsible mechanism to form new clusters. First
results indicate that the model is able to predict the on- and offset of new
particle formation as well as the total aerosol number concentrations that
were in good agreement with the observations. Further, comparison of
predicted and measured H<sub>2</sub>SO<sub>4</sub> concentrations showed a satisfactory
agreement. The simulation results indicated that at a certain transitional
particle diameter (2–7 nm), organic molecules can begin to contribute
significantly to the growth rate compared to sulphuric acid. At even larger
particle sizes, organic molecules can dominate the growth rate on days with
significant monoterpene concentrations. The intraday vertical evolution of
newly formed clusters and particles in two different size ranges resulted in
two maxima at the ground. These particles grow around noon to the detectable
size range and agree well with measured vertical profiles.
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