The Numerical Characteristics of a Severe Dust Storm over North China in the Spring of 2006

The case of the most severe dust storm in the spring of 2006(i.e.,9-11 April) over north part of China is studied.Firstly,the weather pattern and its influencing system are diagnosed.Then,an integrated dust storm modeling system with advanced land surface scheme(Noah) and complete physical processes of wind erosion is employed for the simulation of the severe dust storm.The results show that the modeling system is capable for better describing the main characteristics of the dust events,such as,diurnal of dust,and so on.It can also provide the important information of the whole process,including origination,development and weakening of the dust event in comparison with meteorological observations.The main dust emission area is Tarim Basin,Turpan Basin,the northern part of Gansu,the southern part of Mongolia and boundary between Mongolia Gobi Desert and the north part of China,including Hunsandake Sandy Land and surrounding area.The particle size which contributes significantly to the dust emission is different due to the variety of land surface and soil moisture,however,the quantities of particles with diameter from 2-22 μm is predominated.