Study On Dust Event Monitoring Techniques Using Lidar System

Dust events are disaster weather with strong destructivity. It may bring serious impact of industry/agricultural production, human health and climate. Also, it may destroy entironment and cause ecological deterioration. As a natural phenomenon, as long as the factors which cause dust events have fromed, it inevitably coming. Therefore, we must using effective monitoring to realize sand and dust events in order to decrease the loss.In this paper, the lidar dust events monitoring techniques have been studied. The parameters calculate technique of Mie scattering lidar have been detailed analysis. The aerosol and dust parameters calculate system has been analysed, designed and developed. It is used to dispose and analyse echo signal of lidar. Also, other methods of dust monitor have been depth analysis and realize, such as Beta dust monitor, satellite remote sensing, AERONET and DREAM model. In study, we using backscattering lidar LB-D200 to monitor sand and dust weather at Beijing in spring of 2006 and 2007, calculate aerosol parameters, analysis the difference between the data acquire by lidar and other monitor method. Also, discuss the method of data comprehensive utilization which acquire by all monitor methods.The major conclusions are showed as following:(1) Use backscattering lidar to monitor aerosol vertical structure is very effective. It can reflect the altitude of aerosol layer, and aerosol distributing in each altitude. And it is conducive to Analysis the change of dust events.(2) The polarization signal of laser can be used to distinguish whether the aerosol compose of dust.(3) To distinguish by contrasting, we found that the data monitor by lidar and by other monitor methods are in substantial agreement. Also the advantage of lidar is obvious, it can monitor the space-time distribution verticality.