Numerical Simulation Of A Dust Storm Event Happened In April 2003

The model HYSPLIT-4 is used to simulate the long distance transportation of a dust storm occurring on 9 April 2003 in Northwest China,with the data offering from the result of the Global final(FNL) numerical simulation(NCEP,NWS,US) and the model MM5V3 is used to simulatie the weather of the dust storm with the data from Internet of Climate Diagnostics Center(NOAA,US).Results show that:The original airborne dust,which is responsible for the dust storm event on 9 April,2003,came from not only one dusert area.One part of the airborne dust is from BaDanJiLin desert and TengGeLi desert,another is from TaKeLaMaGan desert and KuMuTaGe desert;In the process of the long distance of this dust storm event,there are two high concentration centers transporting eastward.One is located in the latitude 40.The time of the dust storm happened later and the scale is larger than the other.The other is located in the latitude 35.The time of the dust storm happened earlier and the scale is smaller than the other. The synoptic status of the dust storm is that there is a cold vortex leading strong cold low and strong wind.The wind and the lasting several days of dry air is helpful to startup of the dust storm.And in the high altitude,the energy of baroclinic process help the dust storm last.After April 9,westerly wind play a leading role in the great part of North china, and this situation is helpful to the long-distant transportation of dust particles.