The Earth-based Digital Monitoring Of Sand-dust Storm Weather

Sand-dust storm is harmful to the environment of urban and country, industry andagriculture production, human health and so on. The sand-dust storm weather monitoring isthe base of sand-dust storm study and a basic method to obtain data. The article will try toestablish a simple-structure, low-price and good-effect digital earth-base monitoring system.And I apply the ENVI4.0 to analyse the RGB of the monitoring data. By the TSP(TotalSuspended Particles) and Visibility the methord can quantitatively and qualitatively monitorthe sand-dust weather passing through the area.During the course of 2003 ~2005 we have done the work of digital earth-base monitoringof sand-dust storm in Chang Chun and have observed 39 light, 8 moderate and 2 hardsand-dust storms. Based on the monitoring data we draw a conclusion of the monitoring area,find some characteristic rules and bring forward the sand-dust weather development current.According to the analysis of the monitoring data, the characteristic of the monitoringarea is :(1) ChangChun belongs to the North-East Asian, The sand-dust storm bursts out in winterand spring in high frequency in the district. And the frequency and intensity ofsand-dust storm from March to May are higher than other months;(2) ChangChun is impacted by sand-dust storm annually. It is the one of the roads thatAsian sand-dust storm passes through and the Asian sand-dust storm can even impact theKorea Peninsula and Japan islands.(3) By the analysis of monitoring data the frequency of Asian sand-dust storm increases andintensity of it goes to lower. Because the sand-dust storm often passes the monitoringarea in 2~3 hours obviously, I believe the sand-dust particles from other places is morethan local places.