Geoscience Reference
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Fig. 7. The occurrence probability of backscattering ratio with the value higher than
6 vs relative humidity.
3.2
. Relationship between BGA and clouds
The frequency distribution for the probability of occurrence for
higher
than 6 is shown in Fig. 7. From these three-year cases, we found that most
cases (
BR
was higher than 60%-70%. This can be
one of the causative reasons that would lead to the growth of the aerosol
particles by condensation, thus changing their optical properties. This result
is similar to that of Hanel
3
and Fitzerald
BR
>
6) occurred when
RH
et al.
11
The correlation of maximum extinction coe
cient and maximum
DR
of cloud cases is shown in Fig. 8. Most of the cloud layers (
RH
>
70%)
have the maximum
lower than 0.1. The cases, which have the maximum
extinction coecient higher than 1 (1/km), showed a sharp increasing trend
with increasing
DR
. This may be possibly due to the multi-scattering effect
or also can be due to the presence of large particles with nonspherical
shapes that can produce large scattering which can be related to long-range
transport of Asian dust storms with moisture and pollutants.
12
DR
