Dust Particle Distribution and Physical Characteristics over Hunshan Dake Sand-Land during Spring

The physical characteristics of dust aerosol were collected over Zhurihe (ZH) site, which lies on the southwest border of Hunshan Dake sand-land (HDS), by using WPS (wide-range particle spectrometer) model 1000 XP during the spring of 2006. Size distributions of particles with 0.5-10.0 mum were examined and the daily mean number concentration of aerosols for the situ periods on non-dusty days was 86.7 cm^-3. It was 1333.08 cm^-3 on windblown dust (WD), 2817.09 cm^-3 on light dust storm (LDS) and 4372.58 cm^-3 on severe dust storm (SDS). Comparing with Sanggen Dalai (SD), which lies in the inner of HDS, observed during IMGRASS (inner-Mongolia semi-arid grass-land atmosphere surface study) of 2001, the average number concentrations of dust aerosol was 3039.5 cm^-3 on SDS , 659.7 cm^-3 on LDS, 198.3 cm^-3 on WD and 27.7 cm^-3 on ND of the inner HDS. The results show that there are more dust aerosols over the board than the inners both on dusty days and non-dusty days, but the mean particles diameter over the inner is larger than the boards.