Cloud Characteristics And Precipitation Correlation Analysis In The Area Of Qilian Mountains Based On Cloudsat Satellite Remote Sensing Data

It is an important subject of water conservancy project because the atmospheric water resourceise is abundant but the surface water and groundwater are seriously insufficient,and the study of improving the efficiency of atmospheric water resources utilization is facing the problem of regional water shortage in our country's scientific and technological needs.Clouds at different heights have an indication to artificial rain-raising operations because of their different physical characteristics,and the study of the microvertical characteristics and precipitation relationship of cloud macrointhesin in Yanlianshan is an important way to further understand the precipitation process and improve the level of artificial influence on the scientific level of weather and operational efficiency,and provides technical support for artificial rain-raising experiments.Using 23 meteorological sites to measure precipitation data,this paper analyzes the spatial and temporal distribution characteristics of precipitation in Yanlianshan area from May 2007 to September 2010 by using Arcgis platform to select the inverse distance weight interpolation method.On the basis of careful study of remote sensing observation data at home and abroad,the integrated Cloudsat and CALIPSO satellite radars can fully detect the advantages of the interior of the clouds,and analyze the vertical distribution characteristics of the five cloud macro parameters and 6 cloud microphysical parameters commonly found in the Lulianshan area by using 263 segment radar cloud profile lines(a total of 132525 available data points)during the statistical period.According to the characteristics of regional precipitation and cloud parameters,the correlation between the correlation rules Apriori algorithm in data mining is applied to the analysis of cloud microphysical parameters and precipitation,and on the basis of the resulting strong correlation rules,24 typical cases(a total of 33,271 available data points)are selected to further analyze the correlation between cloud microphysical parameters and precipitation in different height layers.The main conclusions are as follows:(1)The precipitation in the study area showed a decreasing trend from south to north,and the correlation coefficient between the average monthly precipitation and altitude of the site was greater than 0.8.The site precipitation data is well representative of the precipitation in the area of 20 km.(2)The total cloud score within the scope of each site in the Yanlianshan area is basically distributed between 30% and 70%,and the total cloud score increases with the elevation,with a correlation coefficient of 0.81.The peak of the vertical distribution of clouds in the south slope region occurs in the clouds about 2km from the surface,with clouds concentrated in the clouds of 1 to 3 km,and the clouds in the north slope have no significant peaks and are evenly distributed in the multi-clouds.(3)The development of the cloud is closely related to the terrain,with the coefficient of the height and terrain correlation between the single-layer cloud and two-layer cloud base all reaching-0.85.The vertical distribution law of cloud parameters at different altitude sites is obviously different.(4)The effective radius of cloud liquid particles is mostly concentrated in the range of 100 to 140 m,the vertical distribution of cloud ice water content is single-peak type,the change softer on both sides of the peak is basically symmetrical,the maximum value of the effective radius of cloud liquid/ice particles appears in the cloud cloud about 1km from the surface,and the vertical distribution of cloud liquid/ice particle concentration is similar to the change trend of cloud liquid/ice water content.(5)There is an excellent strong correlation rule between the precipitation situation of the south slope and the microphysical parameters of the liquid cloud.When there is precipitation,the average amount of cloud liquid water from clouds below 1km below the surface is greater than 250 mg/m3,and when the average effective radius of cloud liquid particles in clouds of 2 to 3 km is 120 to 150 m,more than 80% of the data show precipitation.(6)In the course of 24 precipitations,the effective radius of the particles and water content and precipitation of the liquid clouds of different heights in the southern slope showed the correlation in some clouds above 1.5km above the surface,and the correlation coefficient scored-0.81 in the clouds 2.75 to 3 km from the surface,while the correlation coefficient of the north slope reached 0.95 in the clouds from 4.75 to 5 km above the surface.