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g/m 3 ) averaged for the
layers of below 100 m ( ), 100-1500 m ( ) and above 1500 m ( ) above the ground
is given at (a) Duolun in China, (b) Baeknyeongdo, (c) Anmyeondo and (d) Gosan in
South Korea from the original ADAM model (ADAM1). The modeled dust emission
(ton/km 2 /h) at Duolun (- - -) and the observed PM 10 concentration is denoted by “
10 3 µ
Fig. 2. Time series of modeled PM 10
concentrations (
×
”.
causing a wide spread of desertification in northern China. 4 The drought
in Region 2 continued from 1999 to the spring of 2002. Thereafter the
precipitation increased to above normal in 2003 (Table 2).
Figure 3 shows the monthly mean AVHRR normalized vegetation index
averaged in each Region from 1998 to 2001 and for 19 years from 1982
to 2000. During the drought period (from 2000 to spring of 2002), the
vegetation index is much lower compared with the long-term average value
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