Atmospheric Chemistry and Physics Discussions
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2008
10.5194/acpd-8-18765-2008
http://www.atmos-chem-phys-discuss.net/8/18765/2008/
http://www.atmos-chem-phys-discuss.net/8/18765/2008/acpd-8-18765-2008.html
http://www.atmos-chem-phys-discuss.net/8/18765/2008/acpd-8-18765-2008.pdf
18765
18802
2008-10-31
Development of a global model of mineral dust aerosol microphysics
Y. H. Lee
yunhal@andrew.cmu.edu
K. Chen
P. J. Adams
Dept. of Civil and Environmental Engineering, Carnegie Mellon Univ., Pittsburgh, PA, USA
Vermilion Asset Management, New York, NY, USA
Dept. of Engineering and Public Policy, Carnegie Mellon Univ., Pittsburgh, PA, USA
A mineral dust module is developed and implemented into the global aerosol
microphysics model, GISS-TOMAS. The model is evaluated against long-term
measurements of dust surface mass concentrations and deposition fluxes.
Predicted mass concentrations and deposition fluxes are in error on average
by a factor of 3 and 5, respectively. The comparison shows that the model
performs better near the dust source regions but underestimates surface
concentrations and deposition fluxes in more remote regions. For example,
including only sites with measured dust concentrations of at least 0.5 μg m<sup>−3</sup>, the model prediction agrees with observations to within a
factor of 2. It was hypothesized that the lifetime of dust, 2.6 days in our
base case, is too short and causes the underestimation in remote areas.
However, a sensitivity simulation with smaller dust particles and increased
lifetime, 3.7 days, does not significantly improve the comparison. We
conclude that the underestimation of mineral dust in remote areas results
from local factors and sources not well described by the dust source
function and/or the GCM meteorology. The effect of dust aerosols on
CCN(0.2%) concentrations is negligible in most regions of the globe;
however, CCN(0.2%) concentrations decrease by 10–20% in dusty regions
as a result of coagulational scavenging of CCN particles by dust and a
decrease in H<sub>2</sub>SO<sub>4</sub> condensation to CCN particles due to the
additional surface area of dust.
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