Analysis Of The Vertical Structure Characteristics Of Deep Convective Clouds In The South China Sea Based On Spaceborne Radar Data

Based on Cloud Sat satellite data,this paper matches the cloud type information on the vertical profile,the height information of the cloud top and the bottom of the cloud,and the cloud microphysical quantity information,and extracts the cloud microphysical quantity profile samples of the daily deep convective clouds in the South China Sea after 2006.The cloud microphysical data set based on the altitude is reconstructed into a cloud microphysical data set based on the height of the cloud base.Separate the convective cloud core from its surrounding cloud anvils,and separate the deep convective core cloud profile data set independently.The ice water path is selected to indicate the different development stages of deep convective clouds,and the daily deep convective cloud microphysical quantity profile samples in the South China Sea are classified into different cloud development stages.Based on the samples of the various development stages of deep convective clouds,we use height-frequency distribution(CFAD)to analyze the statistical characteristics of cloud microphysical vertical structure,and compare and analyze the magnitude of microphysical quantities,vertical structure,and the difference in characteristics of CFAD at different development stages of deep convective clouds.Reveal the law of its evolution.Convective core and convective cloud anvil cloud microphysical quantity difference in magnitude and vertical structure are comparatively studied,and the correlation between different cloud microphysical quantities is simultaneously analyzed.The main conclusions of the full text are as follows:In deep convective clouds,there are only liquid water particles below 4km,only ice particles above 9km,and the two coexist between 4-9km.With the development of deep convective clouds,the values of the microphysical quantities of the three liquid phase clouds are constantly decreasing,while the microphysical quantities of the ice phase clouds are increasing.In the lower part of the cloud,the cloud water condenses and collides and grows as it rises;the middle layer of the cloud has a vigorous Bergeron process.The supercooled water sublimates into water vapor and then condenses into ice particles,making the concentration of ice particles and ice water The content continues to increase,while the concentration of liquid water particles and the content of liquid water continue to decrease;the upper layer of the cloud has no supercooled water,only the middle layer continuously transports ice particles upwards,because the ice particles rising to a high place are difficult to drag by gravity.Ascending to the top of the cloud,the process of collision and growth occurs during the descending process,as well as the attachment process that consumes the supercooled water in the middle layer of the cloud.The content of liquid water in the cloud below 4km,the concentration of the number of liquid particles,and the effective radius of the liquid particles are basically positively correlated with each other.The correlation between the effective radius of ice particles above 9km and the ice water content in the cloud gradually becomes disproportionate with the increase of the ice water path.Comparing the differences in the vertical structure of microphysical quantities between convective cloud cores and convective cloud anvil clouds at different development stages,the liquid water content,liquid particle number concentration,and effective radius of liquid particles in the convective cloud core under the same ice water path are basically smaller than those of the convective cloud anvil,Ice water content,ice particle number concentration,ice particle effective radius must be larger,and the maximum height is also greater,and structural differences all indicate that the liquid water in the convective cloud core is converted to ice water faster and moves upward.Also more intense.The microphysical quantities of the convective cloud core below4 km in the cloud and the three liquid phase clouds in the convective cloud anvil are still basically proportional to each other.Under the same ice water path,the correlation in the convective cloud anvil is stronger.The positive correlation between the effective radius of ice particles and the ice water content in convective cloud cores and convective cloud anvils above 9km in the cloud decreases with the increase of ice water path,and it is larger in convective cloud cores.