The Statistical Analysis And Dynamics Study On The Relation Between High Jet And Sandstorm

correlation is carried out to reveal the relation between sandstorm and high level jet during 2000-2004, and the numerical simulation and diagnosing to strong sandstorm of the 8th - the 9th of April, 2001 also has been carried On by MM5 mode in this paper. The statistical result shows: The sandstorms that the jets cause can be divided into 2 kinds: Single jet pattern and double jet pattern. Sandstorms is likely to occur left to where the high level SW single jet and NW single jet and right to their enters, or left to where the high level NW jet exits .the abnormal jets have important function on the emergence and development of the sandstorm .Some conclusions have been drawn in simulation (that) the sandstorm has obvious momentum spreading that is made by latitude wind mainly. The position and the degree of strong or weak of divergence field and vertical velocity field have close relations to emergence and development of high jet and sandstorm. The ageostrophic wind latitude components determine the direction rotated of two jets' axles.The change of barotropic potential vorticity (MPVl) have good correspondence with the development of the high jet and sandstorm: the north jet lie in Intensive positive of MPVl large value Isopleth's area in high latitude, the south jet lie in Intensive positive MPVl large value Isopleth's area in middle and low latitude. The movement direction of two jet axles coincide with southern positive MPVl large value Isopleth's areas separately, and the sandstorm takes place near positive MPVl's gradient large value district or lie in northwest of potential vorticity (MPV) area too. Symmetrical judder takes place in sandstorm area. The positive potential vorticity area can reflect cold air and cyclone's activity of circulation well. There is certain corresponding relation between the emergence and development of the barclinity of the atmosphere and vertical circulation.