| The microphysical parameterization scheme of cloud and precipitation plays an important role in the study of numerical weather prediction and simulation, and the radiative forcing produced by the microphysical process of cloud will also affect the results of the satellite radar.Therefore, further research on the effects of cloud microphysics and radiation on regional precipitation process and the microwave, to understand the nature of the formation and development of cloud and precipitation process, retrieval of cloud parameters from satellite data and cloud data assimilation are of great significance.In this paper, we used the mesoscale numerical model WRF,combined with the MWRT radiative transfer model. In order to obtain different convection Intensity Precipitation Cloud graupel spectrum distribution feature of the impact of high-frequency microwave radiation brightness temperature, we based on the precipitation of the ideal super monomer storm cloud and a heavy precipitation process in East China in July 2005 9-11, and performed the numerical simulation of two heavy rainfall processes by using the Morrison dual parameter microphysical scheme. In the analysis of the two heavy rainfall cloud particles based on Microphysical Characteristics, we adjusted the parameters of graupel spectrum in the sensitivity experiment, and obtained the hydrometeor profiles with different experimental schemes to input microwave radiation transfer model to determine the influence of spectral pattern of graupel cloud area high frequency microwave radiation, and got the main conclusions as follows.In the ideal convective single storm model, changes in the Morrison scheme of graupel parameterization will directly affect the graupel particle size distribution, which can influence the distribution of hydrometeor mass concentration on the convection and ice phase process, indirect effects on clouds of high frequency channel microwave brightness temperature.the changes of graupel spectrum distribution parameters have effects on the concentration of ice phase hydrometeors in cloud distribution and quality of high frequency channel microwave brightness temperature. in the two-moment Morrison scheme, Decrease (increase) of graupel density parameters of r will lead to increased spectral width of graupel spectrum(decrease), which leads to the touch and improve the efficiency of graupel(reduce), and makes the maximum graupel concentration increased(decrease),and the maximum mass concentration of ice and snow decreases(increases), finally leads to the decrease of the minimum brightness temperature (increase). The shape parameters of d increased graupel will lead to increase the spectral width of graupel spectrum (decrease), the maximum graupel concentration increased space (decrease), while the maximum concentration of ice crystal and snow decrease (increase), eventually making the simulation area the lowest brightness temperature decreases (increases). In addition, the simulated regional minimum value of brightness temperature sensitivity for different parameters or the same change different graupel parameters of different graupel. Finally, the conclusions are verified in the simulation of summer precipitation in East China, the changes of snow and graupel and high frequency channel brightness temperature by effect of graupel density parameter ? , which was consistent with the ideal model.The meso-scale WRF model, to simulate the effect of ice phase process Morrison scheme on the actual precipitation events have deviation, indirectly lead to the simulation of high frequency microwave brightness temperature in the range of low value than the actual satellite observations of low,however,in the Morrison scheme, describing the graupel ice phase process parameters increase (decrease), will make the final simulated brightness temperature increase (decrease), is one of the factors that influence the numerical simulation of the ice phase process and the simulation of the high frequency channel brightness temperature. |
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