Sandstorm refers to a special weather phenomenon that strong winds roll up a lot of dust from the ground, making the horizontal visibility of the atmosphere less than 1 km. Figure A shows that sandsto

Sandstorm refers to a special weather phenomenon that strong winds roll up a lot of dust from the ground, making the horizontal visibility of the atmosphere less than 1 km. Figure A shows that sandstorms in China mainly (1) Tarim; Qaidam

(2) Junggar; Loess; North China

(3) Drought, semi-drought (water shortage) and desert (desert and loess) are widely distributed, and vegetation is sparse.

(4) Sandstorms are mainly concentrated in (late winter and) spring (February, March, April and May). Rapid warming, loose topsoil (surface) (and sparse vegetation), less precipitation and more windy weather.

(5) (certain) periodicity (fluctuation, rhythm, oscillation, ups and downs, etc. ); 12