西安降水短周期振荡现象

Short-period oscillation of precipitation in Xi'an

根据１９６１～１９８５年西安单站逐日压、温、湿及降水资料，分析得出压、温、湿及降水的变化特征和它们之间的关系，并将西安１９８７年１～１２月逐日１４时压、温、湿资料分离为气候值、低频值和高频值，分析发现高频值的振荡周期与该地降水过程的振荡周期相吻合。

Basis on the data in Xi'an from 1961 to 1985,the variable character and relation of the pressure ,temperature,humid and precipitation are analyzed. It is separated that the climatic value,low frequency and high frequency from 14h's daily pressure,temperature and humid from Jan to Dec in 1987 in Xi'an, and found that the high frequency period corresponds with precipitation oscillation.