关键词: 沙尘暴, 扬沙, 滑动t检验, 突变, 强沙尘暴

Abstract: Based on the meteorological date from 334 stations in China during 1954\_1998,the temporal and spatial variation characteristics of sandstorm and sand-blowing weather are studied.The results are as follows:(1) sandstorm and sand-blowing weather had an obviously inter-annual change in recent 45 years.In total,the days of sandstorm and sand-blowing weather decreased with time in China.Both the minimum of the number of the days and the maximum of the relatively variational rate emerged in 1990's.(2) In the past 45 years,sandstorm had the oscillation period of 2~3 years.An obvious jump of the days of sandstorm and sand-blowing weather respectively occurred in 1985 and 1984.(3) There was an increasing trend of frequency of strong sandstorm from 1950's to 1990's,so the harm of sandstorm and sand-blowing weather to our society also became seriously.It is very necessary to protect environment and control desertification for decreasing the days and degree of sandstorm and sand-blowing weather.

Key words: sandstorm, blowing-sand, t-test, trend