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cloud microphysical variables
相关语句
  相似匹配句对
     THE CLOUD
     云
短句来源
     Studies on Microphysical Processes in Hail Cloud
     冰雹云中微物理过程研究
短句来源
     Progress in Researches on Explicit Cloud Microphysical Schemes
     显式云物理方案的研究进展
短句来源
     Strolling in the Cloud
     第八层:云中漫步
短句来源
     EVALUATION ON CLOUD VARIABLES FROM ISCCP DATA OVER CHINESE CONTINENT
     中国大陆卫星反演云参数的评估
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  cloud microphysical variables
Therefore, retrieval of cloud microphysical variables from radar measurables is a highly underdetermined problem.
      


A simple analysis scheme proposed by Brewster K in 1996 is used to retrieve cloud microphysical variables such as water mixing ratio and rainwater mixing ratio of cloud, as well as humility variable of the model air from Doppler weather radar's reflectivity. The initial fields of meso-scale numerical model desived from model's data assimilation system can include cloud microphysical messages and show where the air is saturated within model space. A numerical experiment for a rainfall...

A simple analysis scheme proposed by Brewster K in 1996 is used to retrieve cloud microphysical variables such as water mixing ratio and rainwater mixing ratio of cloud, as well as humility variable of the model air from Doppler weather radar's reflectivity. The initial fields of meso-scale numerical model desived from model's data assimilation system can include cloud microphysical messages and show where the air is saturated within model space. A numerical experiment for a rainfall process near Maanshan City of Anhui Province in China on June 19 of 2002 is performed by the Advanced Regional Prediction System (ARPS) based on this scheme. The background fields and boundary conditions come from the globe model's output of AVN in NCEP, and a 600 km×600 km domain is setup with 2 km×2 km horizontal resolution, and 21 layers in vertical. Results show that 1 hour's forecast of the atmospheric composite reflectivity with ARPS matches the detailed echo picture observed by the radar at target time, and the non-uniform distribution of precipitation with some rainfall clusters matches the non-uniform distribution of echoes with several strong clusters. The clouds represented by cloud microphysical variables can be tracked both in horizontal and vertical directions from initial time to the time of forecast, and their changes are consistent with the observed radar reflectivity. Also some of the meso-scale wind structures with convergence and divergence appear near the strong echoes, which result from atmosphere thermodynamic adjustment to the clouds. Comparatively, the forecast doesn't match the observation if not considering such scheme including radar reflectivity within data assimilation system for initial field of the model. So it seems that this analysis scheme used here would be helpful for numerical nowcasting of the precipitation.

一种简单云分析方案 ,用于由多普勒天气雷达反射率反演中尺度大气模式初值分析中的云微物理变量 (云水混合比和雨水混合比 )和空气湿度变量 (比湿 ) ,使模式积分初始场反映出观测空间的云微物理特征以及哪些空间位置上的大气处于饱和状态。应用于 2 0 0 2年6月梅雨期安徽省马鞍山市一次降水过程的临近数值预报试验结果表明 ,模式预报的大气综合反射率与雷达观测的回波图像相近 ,由云微物理变量变化表示的模式云系演变与雷达观测的回波图像一致 ,伴随模拟的中小尺度云系 ,模式大气能很快调整出合理的中小尺度流场辐散、辐合结构 ;它们明显好于模式初始场不引入雷达反射率时的结果 ,即这种方法对改进临近数值天气预报准确率是有效的

 
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