Geoscience Reference
In-Depth Information
Table 12.2
(continued)
Experiment
Major findings
Reference
CCN ability of Asian
mineral dust and its
effect on cloud droplet
formation
The activation fractions (CCN/CN)
were 0.7 at 0.2 %
supersaturation and 0.8 at
SS D 0.4 %, suggesting that
Asian mineral dust particles, by
themselves, may effectively act
as CCN. The hygroscopicity of
the mineral dust particles was
considerably enhanced, and
droplets activated on them grew
much larger when internally
mixed with sea salt particles
Yamashita et al. ( 2011 )
Effect of oxalic acid on
CCN activity of
mineral dust aerosol
Oxalate/calcite aerosols had
identical CCN activity with the
original ones, whereas
polystyrene latex spheres
(PSL)/oxalate aerosols showed
much greater CCN activity.
The increased CCN activity by
incorporation of oxalic acid is
only expected for unreactive,
insoluble dust particles that
form a soluble coating around
the core
Gierlus et al. ( 2012 )
Fig. 12.5 Ice-active site densities ( n s ) for a range of minerals common in mineral dust which were
immersed in water droplets. These results are from Atkinson et al. ( 2013 ) and show that feldspars,
in particular K-feldspar, are the most active ice-nucleating components of mineral dust
 
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