Geoscience Reference
In-Depth Information
Fig. 3. Evolutionary features of the spatial distribution of the daily averaged vertically
integrated Asian dust concentration (
m
2
) expressed in common logarithms from 19
µ
g
/
to 22 March, 2002.
The associated heavy dust clouds with vertically integrated dust concen-
tration of more than 3 g/m
2
have passed over the Korean peninsula on
March 21, 2002 (Fig. 3) thereby producing the near surface PM
10
concen-
tration of more than 1500
µ
g/m
3
at most of monitoring sites over South
Korea (Fig. 2). In the meantime the vertically integrated anthropogenic
aerosol concentration has its maximum value of more than 0.05 g/m
2
over
the southeastern part of China (Fig. 4) where the emission of pollutants
is maximum. On March 21 when the Asian dust concentration is maxi-
mum over South Korea the anthropogenic aerosol concentration becomes
minimum due to the southward transport of transformed aerosols by the
prevailing northwesterly winds (Fig. 4). It is worth noting that the Asian
dust source regions (Fig. 1) do not coincide with the anthropogenic pollu-
tant emission regions, resulting in the different spatial distributions of these
aerosols as seen in Figs. 3 and 4.
