关键词: 沙尘暴, 高空急流, 双急流, 急流异变

Abstract: Using Micaps routine data, we carried out correlation analysis to reveal the relation between sandstorm and high level jet stream during 2000-2004 in China.The sandstorms have very obviously annual, seasonal and daily changing law;There are three areas where sandstorms frequently occurred in China;The big-range and strong sandstorms are mostly accompanied with strong Mongolian cyclone and cold front.Sandstorms and high level jet stream always occurred together.The jet stream caused sandstorms can be divided into 2 kinds: single jet stream pattern and double jet stream pattern.Sandstorms is likely to occur left to where the high level W single jet stream enters, or left to where the high level NW jet stream exits and SW jet stream enters of NW + SW double jet streams.It is also found that there are abnormal jet streams among some double jet streams, and abnormal jet streams have played important role in the forming and developing of sandstorms.

Key words: sandstorm, high level jet stream, double jet stream, abnormal jet stream