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修订日期：2006-12-26
修订日期：2006-12-26
中文摘要: 利用太原C波段多普勒天气雷达基数据资料和自动雨量站资料，对2006年4月11日发
生在山西省的一次区域性暴雪过程进行了分析。应用改进的EVAD技术，定量计算垂直高度层
的平均散度和平均垂直速度，并分析平均散度和平均垂直速度随时间和高度的变化以及与降
雪的对应关系。结果表明：2.5km以下始终维持一个较强的上升气流，是强降雪维持的基本
动力条件；整层出现辐合上升运动，且强上升速度中心的高度随时间的演变逐渐下降，同时
中高层出现强辐散下沉气流与之配合时，未来2小时将出现强降雪；降雪的强度与雷达探测
范围内各高度层的辐合、辐散有着密切的关系，且辐合、辐散的增强与减弱时间早于降雪强
度的增大和减小时间，这对预报降雪的生消、雪强的增大与减小提供了一定的理论依据。
Abstract:By using the data of C Wave Band Doppler weather radar and the precip
itation data from AWS in Taiyuan, a regional snowstorm event occurring in Shanxi
on April 11, 2006 was analyzed. The average divergence and vertical velocity of
the vertical height layers were calculated quantitatively with the improved tec
hnology of EVAD. Their changes in time and space and the corresponding relations
hip with this snowstorm were further investigated. The results indicate that the
strong updraft always keeping less than 2.5km is the basic dynamical mai
n taining mechanism of heavy snowstorms; if anabatic movement appears in whole lower layer and the h
eight ofthe strong updraft center is lower and lower along with time accompany
ing with strong downdraft in middle high layers, then heavy snowstorm will appe
ar in 2 hours later there. The intensity of
snow is closely related to the divergence and
convergence in each height layer within the radar's coverage, and the intensific
ation or decrease of the divergence and convergence appears ahead of that of the
snow intensity. These results provide some theoretic basis for forecasting the
occurrence and disappearance of snowfall and the development of snow intensity.
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基金项目:
| 作者 | 单位 |
| 苗爱梅 | 山西省气象台，太原 030006； 山西省气候中心 |
| 安炜 | 山西省气象台，太原 030006； 山西省气候中心 |
| 刘月丽 | 山西省气象台，太原 030006； 山西省气候中心 |
| 胡志群 | 南京信息工程大学 |
| 李清华 | 山西省气象科技服务中心 |
引用文本：
苗爱梅,安炜,刘月丽,胡志群,李清华,2007.春季一次暴雪过程的多普勒雷达动力学诊断[J].气象,33(2):57-61.
Miao Aimei,An Wei,Liu Yueli,Hu Zhiqun,Li Qinghua,2007.Dynamical Diagnosis of the Spring Snowstorm Process Based on Doppler Weather Radar [J].Meteor Mon,33(2):57-61.
苗爱梅,安炜,刘月丽,胡志群,李清华,2007.春季一次暴雪过程的多普勒雷达动力学诊断[J].气象,33(2):57-61.
Miao Aimei,An Wei,Liu Yueli,Hu Zhiqun,Li Qinghua,2007.Dynamical Diagnosis of the Spring Snowstorm Process Based on Doppler Weather Radar [J].Meteor Mon,33(2):57-61.