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cloud microphysics process
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  云微物理过程
     A mesoscale model and simulation system was developed through incorperating an ice phase cloud microphysics process parameterization and a three phase cloud explicity precipitation scheme. The genesis and development as well as evolutive structure of a mesoscale shear line associated with the “96.1” snowstorm over Qinghai Xizang Plateau were basically successful simulated under the condition of using conventional observational data.
     通过将冰相云微物理过程参数化和三相云显式降水方案引入MM4而发展的中尺度模式模拟系统 ,在采用常规观测资料的条件下 ,基本上成功地模拟出了“96.1”高原暴雪中尺度切变线的生成、发展和演变结构。
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     m process.
     m工艺到SMIC流片。
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     In the process of the E.
     E.
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     THE CLOUD
     云
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     Process Technology of Satellite Cloud Atlas
     卫星云图处理技术
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     ELECTRIFICATION PROCESS WITH ICE PHASE IN HAIL CLOUD
     雹云中与冰相有关的起电机制
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The analysis of generated cause for the “96.1” snowstorm event over Qinghai Xizang Plateau was conducted using weather observational data. The results indicated that the European blocking high collapsed, the cold trough transformed from transversal into upright, the southwards invading cold and dry air flow behind the trough and the northwards intensive southwest warm wet air flow coming from the Bay of Bengal and the Indian peninsula were converged over northeastern part of Qinghai Xizang Plateau while a...

The analysis of generated cause for the “96.1” snowstorm event over Qinghai Xizang Plateau was conducted using weather observational data. The results indicated that the European blocking high collapsed, the cold trough transformed from transversal into upright, the southwards invading cold and dry air flow behind the trough and the northwards intensive southwest warm wet air flow coming from the Bay of Bengal and the Indian peninsula were converged over northeastern part of Qinghai Xizang Plateau while a mesoscale shear line was formed and persistent developed. This shear line was main mesoscale weather system of producing the “96.1” snowstorm over Qinghai Xizang Plateau. A mesoscale model and simulation system was developed through incorperating an ice phase cloud microphysics process parameterization and a three phase cloud explicity precipitation scheme. The genesis and development as well as evolutive structure of a mesoscale shear line associated with the “96.1” snowstorm over Qinghai Xizang Plateau were basically successful simulated under the condition of using conventional observational data. The results showed that the developed and improved mesoscale model and simulation system is suitable for numerical simulation research of the genesis, development and structural evolution of mesoscale system over Qinghai Xizang Plateau of possessing complex topography and underlying surface. Space time evolution of simulated streamline field and physical fields revealed that the space time evolutive consistence of the convergence line of the streamline field with the shear line associated snowstorm showed the expression of the mesoscale system over Qinghai Xizang Plateau that is essential important by using streamline field possesses. An important mechanism of the genesis and development for the snowstorm shear line was that the divergence on upper levels was more intensive than convergence on lower levels and a dynamic coupling of positive vorticity zone with convergent zone. The intension and persistence of vertical ascending motion was a necessary condition of vapor condensation and snow formed by freezing. The deep, thick, wet tongue and moist convection instability supplied abundant moisture source and thermal instability condition. The superposition of the deep, thick, wet tongue and the convergent zone as well as the ascending motion was an intensive coupling structure for the formation and persistence of the snowstorm. The roughly consistence between the snowstorm zone and precipitation with that of the observational analysis showed the three phase cloud explicity precipitation scheme is basical reasonable.

对“96.1”高原暴雪天气过程进行的天气学成因分析指出 ,欧洲阻高崩溃 ,里海—咸海横槽转竖 ,槽后向南入侵青藏高原的干冷偏北气流与槽前来自孟加拉湾和中印半岛向北不断推进的强劲西南暖湿气流 ,在青藏高原东北部交汇而形成、发展并持续的切变线 ,是产生高原暴雪的中尺度天气系统。  通过将冰相云微物理过程参数化和三相云显式降水方案引入MM4而发展的中尺度模式模拟系统 ,在采用常规观测资料的条件下 ,基本上成功地模拟出了“96.1”高原暴雪中尺度切变线的生成、发展和演变结构。结果表明 ,发展和改进的该中尺度模式模拟系统可用于青藏高原复杂地形和下垫面上中尺度系统发生、发展及结构演变的数值模拟研究。  模拟的流场及诸物理场时空演变揭示 :流场辐合线与暴雪切变线时空演变一致表明 ,流场对高原中尺度系统的表征有本质上的重要性 ;散度场和涡度场相互耦合是暴雪切变线发生、发展的重要动力机制 ;垂直上升运动的加强和持续是水汽凝结和冻结成雪的必要条件 ;湿对流不稳定为暴雪提供了热力不稳定条件 ;辐合带、涡度带、上升运动区和深厚湿舌的迭置是产生暴雪的强耦合结构。模拟的暴雪带和降水量与观测分析大体一致 ,表明三相云显式降水方案基本上是合...

对“96.1”高原暴雪天气过程进行的天气学成因分析指出 ,欧洲阻高崩溃 ,里海—咸海横槽转竖 ,槽后向南入侵青藏高原的干冷偏北气流与槽前来自孟加拉湾和中印半岛向北不断推进的强劲西南暖湿气流 ,在青藏高原东北部交汇而形成、发展并持续的切变线 ,是产生高原暴雪的中尺度天气系统。  通过将冰相云微物理过程参数化和三相云显式降水方案引入MM4而发展的中尺度模式模拟系统 ,在采用常规观测资料的条件下 ,基本上成功地模拟出了“96.1”高原暴雪中尺度切变线的生成、发展和演变结构。结果表明 ,发展和改进的该中尺度模式模拟系统可用于青藏高原复杂地形和下垫面上中尺度系统发生、发展及结构演变的数值模拟研究。  模拟的流场及诸物理场时空演变揭示 :流场辐合线与暴雪切变线时空演变一致表明 ,流场对高原中尺度系统的表征有本质上的重要性 ;散度场和涡度场相互耦合是暴雪切变线发生、发展的重要动力机制 ;垂直上升运动的加强和持续是水汽凝结和冻结成雪的必要条件 ;湿对流不稳定为暴雪提供了热力不稳定条件 ;辐合带、涡度带、上升运动区和深厚湿舌的迭置是产生暴雪的强耦合结构。模拟的暴雪带和降水量与观测分析大体一致 ,表明三相云显式降水方案基本上是合理的。

Based on the explicit cloud schemes described in Part I, a heavy rainfall event is simulated and analyzed within the dynamical framework of HLAFS. The results show that including explicit cloud schemes in a mesoscale model improved the heavy rainfall forecast and the understanding of its mesoscale characteristics obviously. The simulation results of the explicit schemes were better than that of the old diagnostic cloud scheme of HLAFS for rainfall location. The mesoscale model including explicit...

Based on the explicit cloud schemes described in Part I, a heavy rainfall event is simulated and analyzed within the dynamical framework of HLAFS. The results show that including explicit cloud schemes in a mesoscale model improved the heavy rainfall forecast and the understanding of its mesoscale characteristics obviously. The simulation results of the explicit schemes were better than that of the old diagnostic cloud scheme of HLAFS for rainfall location. The mesoscale model including explicit schemes is able to reveal the cloud field evolution and cloud physical characteristics during heavy rainfall development. Ice phase cloud microphysics processes have significant effects on mesoscale processes and their thermal and dynamical structure, especially for precipitate production and maintenance of heavy rainfall during its early developing stage. The outline, location, strength, scale, formation and dissipation, and moving direction of a cloud system are well simulated in general compared with satellite TBB data. The simulated cloud top temperature is in agreement with Satellite TBB.

在HLAFS业务数值预报模式的动力框架下 ,利用文章 (I)所述的显式云降水方案 ,对一次暴雨过程和伴随着的云物理过程进行了模拟研究和分析。模拟结果表明 ,显式方案对降水落区和强降水中心位置的预报较原HLAFS的大尺度饱和凝结方案有明显改进。模式能合理地揭示出暴雨发生、发展过程中的云系演变规律和云物理过程。冰相过程对降水、中尺度热力和动力场有明显影响 ,特别是冰相过程有利于降水的早期的形成速率。与卫星TBB资料的对比分析表明 ,引进显式方案后 ,模式能较合理地模拟出云系的轮廓、位置、范围、强度、生消和移向 ,模式模拟出的云顶温度与卫星测量出的云顶温度较为一致。

 
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