Analysis on 3.19 sandstorm in mid-west area of Inner Mongolian

The most serious sandstorm weather occurred in Inner Mongolia on March 19th,2010.The dust storm started from the west of Mongolia and strengthened in western Inner Mongolia region.The sandstorm weather systems dramatically enhanced in the mobile expansion.They formed the strong sandstorms or dust storms.Using conventional observational data and numerical data,we diagnosticly analyzed the 3.19 sandstorm process,and got the following conclusions:Because of the strongly heating near the ground early,3.19 particularly strong dust storm was leaded by instability of surface heat.The Mongolian cyclone created the lifting movement.The short wave splited from the upper-level trough and merged into the northwest air current.The Mongolia cyclone transfered the strong cold front.The Inner Mongolian mid-west area appeared the strong sand storm weather.The high-level cold advection triggered a frontal secondary circulation,which was vertical in the ground.The upper air jet stream had influenced the production of the sand storm weather.It was under the right side of the jet stream exit,where sinking branch of the jet stream fell on the ground after the ground cold front.The front frontal zone,such as Shanxi、 Hebei、 Henan、 Shandong,had produced the sand blowing or the sand storm weather.