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| 石家庄地区反射率因子垂直廓线特征分析 | |
| 引用本文： | 赵瑞金,张沛源,史锐,董保华.石家庄地区反射率因子垂直廓线特征分析[J].气象科技,2008,36(5):647-652. |
| 作者姓名： | 赵瑞金 张沛源 史锐 董保华 |
| 作者单位： | 1. 河北省气象台,石家庄,050021;河北省生态环境监测实验室,石家庄,050021 2. 中国气象科学研究院,北京,100081 3. 河北省新乐市气象局,新乐,050700 |
| 基金项目： | 河北省气象局科研开发项目 |
| 摘 要： | 利用自动雨量计数据整理成的10 min一次的雨量资料和s波段多普勒天气雷达体积扫描强度数据,对石家庄地区2004～2007年4次天气过程的实时雷达反射率因子垂直廓线的特征进行了分析.结果表明:层状云和混合性降水反射率因子垂直廓线有明显的零度层亮带;短时强降水过程的反射率因子垂直廓线不存在零度层亮带.冰雹过程中反射率凼子垂直廓线变化较大,降雹前反射率因子的极大值在中上层,降雹发生时反射率因子的极大值高度下降,降雹后反射率因子的极大值减弱.降雪过程的反射率因子垂直廓线零度层亮带不明显.在石家庄西部山区,由于零度层亮带的影响.对层状云和混合性降水回波强度和降水量估计偏高.对短时强降水过程的地面降水估计用反射率因子垂直廓线的方法比最低仰角法更加准确,在均匀性降水中可较好地改善地面雨量估算结果,有利于在山区和无雨量计的地区判断强对流天气的发生、发展和估算降水量的大小. |
| 关 键 词： | 多普勒天气雷达 反射率因子 垂直廓线 估算降水量 |
| 收稿时间： | 2007/8/21 0:00:00 |
| 修稿时间： | 2008/1/24 0:00:00 |
Characteristics of Radar Reflectivity Vertical Profiles at Shijiazhuang |
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| Zhao Ruijin,Zhang Peiyuan,Shi Rui and Dong Baohua.Characteristics of Radar Reflectivity Vertical Profiles at Shijiazhuang[J].Meteorological Science and Technology,2008,36(5):647-652. | |
| Authors: | Zhao Ruijin Zhang Peiyuan Shi Rui and Dong Baohua |
| Institution: | Hebei Meteorological Office, 2 Hebei Eco Environmental Monitoring Laboratory, Shijiazhuang 050021;Chinese Academy of Meteorological Sciences, Beijing 100081;Chinese Academy of Meteorological Sciences, Beijing 100081;Xinle Meteorological Burearu, Hebei Province, Xinle 050700 |
| Abstract: | The real time characteristics of vertical profiles of radar reflectivity during four weather processes from 2004 to 2007 are analyzed on the basis of the volume scan data from the Doppler radar at Shijiazhuang and the nearly simultaneous 10 minute precipitation measurements from rain gauges, and meaningful results are gained. There were obvious bright bands on the zero temperature layer in stratiform clouds or merging cloud echoes, but there was no bright band in short time rainstorms. Radar reflectivity vertical profiles varied greatly during a hailing process: before hailing with the maximum reflectivity at middle or upper levels, while hailing with the height of maximum reflectivity descending, and after hailing with the maximum reflectivity weakening. During snowing, bright bands of zero temperature layer were not clear. In the mountain area west of Shijiazhuang, the precipitation and echo intensity in stratiform clouds or merging clouds are usually overestimated because of the impacts of the bright bands on the zero temperature layer. Compared with the lowest elevation method, the estimated precipitation by using the vertical profile method is more accurate for short time heavy rainfall, and shows improvement for homogeneous rainfall. It is a useful and easy method for convective weather forecasting in the areas with large shield angles or without rain gauges |
| Keywords: | Doppler weather radar reflectivity vertical profile estimated precipitation |
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