The Analysis Of Atmosphere Profiler Data And Numerical Simulation Experiment Of Heavy Rainfall Process

In the recent years, it is mesoscale system related to heavy rainfall system thermal and dynamical and the reciprocity of both synoptic scale and sub-synoptic scale systems that are drawing more and more attention from the scientists. Only by analyzing large-scale environment fields is it difficult to seize what is the mechanism of heavy rainfall and educe nice weather forecast. Because the region influenced by transformation of different mesoscale system energy and its maintaining time take on distinct local characters, it is very important to analyzing mesoscale weather by advanced detecting system to the boundary layer.This paper employs T106 data from National Meteorological Center, surface and raob data supplied by the field observation experiment of China Heavy Rain 973 Project. With the non-hydrostatic Mesoscale Numerical Model MM5-V3, an numerical simulated experiment is made on Jianghuai torrential rain on 26-28Jun 2002. We analyze the detecting results of the profile system and other data, which are combined with the results of numerical experiments. The characteristics of physical elements of sub-synoptic scale systems and vertical kinetic energy transformation from upper to lower troposphere are investigated. The dynamical and thermal characteristics and physical mechanisms of heavy rainfall formation are presented.This paper analyzes every three minutes wind and temperature field data of the Wind Profiler/RASS system. These data is obtained from a detecting experiment by CAMS and Japan in summer 2002. It possesses very high science value to study mesoscale weather for its high space-time resolution. Though contrast the Wind Profiler/RASS data and in-phase sonde data, we validate the Wind Profiler/RASS data, but since its short time-distance and big data, its availability has obvious swing, especially, in the strong rainfall weather. We adopt much-time mathematics average measure to enhance usability of these data. Because the Wind Profiler/RASS system, on the observation period, can come in for outside disturbance once in a while, some of these data is invalidation or imperfect,we can deal with them by interpolate measure.We can make out kinetic energy distribution from the upper level to the lower level on the wind profiler kinetic energy time-high section picture. During the heavy rainfall period, the kinetic energy is transported from the upper level to the lower level, which is related to local outburst of the heavy rainfall. When the u wind field and v wind field emerge big value region, the corresponding kinetic energy is also maximum, at the same time, we can find the configuration character of latent heat release in the course of the intense ascending motion and something of mesoscale system action such as shear lines, These features cannot be finely manifested in the modeling results. By contrasting the scale-separating model simulation result and the Wind Profiler/RASS data, we can master the function of mesoscale weather system in heavy rainfall process, and prove the numerical model sensitivity to simulate and predict mesoscale weather. Furthermore, In order to analyze the main dynamical processes in the Jianghuai heavy rainfall event we also calculate each term in the synoptic scale, sub-synoptic scale and nonlinear interaction kinetic energy equation by using the kinetic energy equations and T106 data. Results show that nonlinear interactions exist between synoptic and sub-synoptic systems in the event, by which the kinetic energy of the synoptic system is reduced and that of the sub-synoptic system is increased. But only by nonlinear interactions the kinetic energy of the synoptic system can be transformed into that of the sub-synoptic system, that is to say, the synoptic system acts as a source of kinetic energy for the sub-synoptic system to grow the heavy rainfall system.With the progress in atmosphere detecting techniques, kinds of high space-time distribution data are being tried to be applied in Mesoscale Numerical Model, the results in this paper suggest that applying th...