Analysis on Structural Feature and Precipitation Enhancement Potentiality about Precipitation of Typical Stratiform Cloud

By using FY-2C satellite photographs,radar data,hourly precipitation data and NCAR/NCEP data,the paper analyzed the precipitation process of stratiform appearing in 24~25th,November 2005 in Henan.The result shows that the trough-shear-circumfluence stratiform clouds are the main influence clouds.The shear-line clouds are warm with the uniform structure,and the trough-clouds are cold and their TBB is not uniformity with low-brightness temperature band structures.After trough-cloud system which moving eastward and shear-line system which jumping northward overlaid,the movement of mesoscale clouds could be concluded and the precipitation became stronger.The strong rain appeared between the 700 hPa and 850 hPa shear lines where was in the front of 500 hPa trough-line,and the rainfall intensity had a good corresponding relationship with the brightness temperature of top.The relationship between brightness temperature and rainfall intensity appearing to the north of 700hPa shear line is not sure.The main causation is that the joint of shear-line clouds and trough-line clouds not only had more abundant water vapor,but also had the better condition of dynamic lifting and convergence,especially had the condition of convective instability;and because the area in the north of shear-line is lacking in water,it is not easy for the nature precipitation to appear although there is the condition of convective instability near troposphere.At last,the precipitation enhancement potentiality is analyzed simply using FY-2C satellite retrieval data :the higher top temperature part of trough-shear clouds are according with the cloud seeding idea,and the part in the north of shear-line has the poor precipitation enhancement potentiality because of colder top temperature and lacking of water vapor and the seeder-feeder mechanism is not established perfectly.In conclusion,the analysis of satellite data and diagnose can be a good estimation gist for precipitation enhancement potentiality of stratiform cloud.