关键词: 沙尘天气, 物理量, 相关性, 2000年, 春季

Abstract: In this paper the frequency of dust-stormy weathers such as dust storm,wind-blown sand and floating dust have been presented by analyzing the data of dust-stormy weather occurred in China during the spring of 2002.And the correlations between dust-stormy weather and meteorological elements have been analyzed also,the meteorological elements included wind speed and divergence on 850 hPa layer;wind speed,divergence,vorticity,total energy and vertical velocity on 500 hPa layer;instable index,vertical difference of wind speed between 850 hPa layer and 300 hPa layer.In the spring of 2002,the dust-stormy weather have obvious regional characteristics besides common periodical characteristics,namely the frequency of floating dust is higher in South Xinjiang region than in the other regions;the frequency of wind-blown sand is the highest in Hetao area;the frequency of dust storm is the highest in Mongolia area.It has further been confirmed by correlative analyses between dust-stormy weather and meteorological elements that wind is the most important meteorological element for formation of dust-stormy weather.Although wind may affect the formation of floating dust,it is not a determinant factor.However wind is a determinant factor for the formation of wind-blown sand and dust storm.

Key words: dust-stormy weather, meteorological element, correlation, the year of 2002, spring