Development Of A Dust-sand Storms Monitoring System Based On The Sun Photometer With A Preliminary Study On The Observation Precision Influenced By Cloud

A dust-sand storms monitoring and precaution system (RealTime) based on CE318 has been developed. It is a kind of application software based on the object oriented programming method. This kind of application software can analyze the large amount of data generated during the process of real-time observation and perform automatically to compute, display and store the data of aerosol optical properties of different filters. It can make good use of the real-time measurements in the research of aerosols, especially in the research of monitoring and precaution of dust-sand storms in the northern part of China. The results have been proved to be in chime with the data of AERONET. A kind of application software (Timeshow) with the cloud-screening algorithm has also been developed to deal with the historic data.The observation of the CE318 over Xilinhot of the year 2006 was analyzed. We analyzed the variation of calibration value within the variation of cloud, as well as the impact on the precision of retrieval results influenced by the frequency of calibration. With the calibration values of fine quality and the retrieval method coincident with AERONET, we got daily variations of AOD in different weather conditions and the observation precision influenced by cloud. In addition, we used the satellite data for a previous study.With the observation of visibility meter, we got the correlation coefficient between AOD and visibility in dusty weather. The results presented a power relation between AOD and visibility, and presented a logarithm relation between Angstrom exponent and visibility.The results of spectrum distribution showed that extinction method retrieve better between the spectrums ranging from 0.1 to 5μm, especial between the spectrums ranging from 0.1 to 1μm. The spectrum distribution in the dust weather was quite different from that in the fair weather. In the dusty weather, a remarkabe increase of aerosol number concentration of the large dust particles (r >0.3μm) by one magnitude was realized. The aerosol size distribution was similar to a Junge distribution.