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where
is the total (aerosol + molecule) depolarization ratio which is
obtained by taking the ratio of the perpendicular and the parallel intensity
relative to the outgoing laser beam.
δ
δ m is the molecular depolarization ratio
4%). 10 Equation (2) also indicates how correlation of the above
two traces namely,
(
δ m
1
.
will provide the
information of solid or liquid particles' dominance. The depolarization ratio
is 0 for spherical particles and deviates from 0 for nonspherical particles such
as mineral dust.
BR
and
δ a , along a vertical interval ∆
z
2.2 . Background aerosol and cloud definitions
In order to understand the optical properties of cloud in the height region
of 0.7-3 km, we need to distinguish the differences between the clouds
and aerosols. We defined the background aerosols (BGA) based on their
scattering properties which follows two criteria: (i) the backscattering
coecient should be smaller than five times that scattered by air molecules
and (ii) the
of aerosols should be smaller than the value of 0.1 at
the aerosol layer (Fig. 2). BGA normally consists of pollutants, sea salt,
DR
Fig. 2. The height distribution of backscattering ratio (—), depolarization ratio (- - -),
and relative humidity ( ) on 7 March 2002.
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