Dust aerosol concentration and its transportation characteristics in Inner Mongolia:a case study of Zhurihe in spring

Utilizing the observation data of dust aerosol which has been measured by WPS particles spectrometer in the northwest of Ongin Daga Sandland of the Inner Monoglia Autonomous Region of China in spring in 2006,and with the meteorological observation data,the characteristics of number concentration,spectral distribution and transportation in sandy weather were analyzed and discussed.The results show that:(1) The daily change characteristics of different grain size dust aerosols are significant with two peak time intervals at about sunrise and sunset periods.For 0.01~0.02μm and 0.02~0.1μm grain size particles,there is also a peak change at the noon.For the 0.1~1.0μm and 1.0~10μm grain size particles,the peak change in sandy weather is larger than non-sandy weather.(2) The number concentration of 0.01~0.02μm grain size particle in sandy weather is less than that in non-sandy weather.The number concentration of 0.02~0.1μm,0.1~1.0μm and 1.0~10μm are larger than that in non-sandy weather.(3)Meteorological factors show significant influence on the number concentration distribution of dust aerosol.The correlations between wind speed/air temperature/relative humidity and particles with different grain size intervals are dissimiar.(4)Dust storm process shows different transport distances and amounts for various intervals of grain size.