| 两次降雪天气过程预报中边界层风廓线雷达资料的应用 |
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| 引用本文： | 翟亮,王令,刘文军.两次降雪天气过程预报中边界层风廓线雷达资料的应用[J].气象科技,2012,40(5):783-788. |
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| 作者姓名： | 翟亮 王令 刘文军 |
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| 作者单位： | 1. 北京市气象台,北京,100089
2. 北京市海淀区气象局,北京,100080 |
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| 基金项目： | “公益性行业（气象）科研专项200906039”、2010年公益性行业（气象）科研专项“冬季降水相态预报技术研究”（GYHY201006010）资助 |
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| 摘 要： | 通过分析2009年10月31日至11月1日和2009年11月9-10日北京两次不同类型降雪天气过程中海淀边界层风廓线仪数据发现:①降雪开始前2h内底层偏东气流建立,且该气流里均有风速突然加强的现象,这对短时临近预报中预报降雪的起始时间有一定参考价值；②700 hPa以上出现冷平流或者冷平流加强且高度降低,也是降雪即将开始的一个特征；③风廓线资料计算得到的温度平流廓线可以较好的反应大气稳定度情况,为判断降雪是否为对流性降雪提供可靠依据.在临近预报中加强风廓线和温度平流的监测,对临近转折性天气的预报有指示意义.
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| 关 键 词： | 降雪 临近预报 风廓线 垂直速度 温度平流 |
| 收稿时间： | 2011/3/31 0:00:00 |
| 修稿时间： | 8/1/2011 12:00:00 AM |
Application of Boundary Layer Wind Profiler Radar Data to Forecasting of Two Snowy Weather Events |
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| Zhai Liang,Wang Ling and Liu Wenjun.Application of Boundary Layer Wind Profiler Radar Data to Forecasting of Two Snowy Weather Events[J].Meteorological Science and Technology,2012,40(5):783-788. |
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| Authors: | Zhai Liang Wang Ling and Liu Wenjun |
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| Institution: | (Beijing Meteorological Observatory, Beijing 100089; Haidian District Meteorological Service, Biejing 100080) |
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| Abstract: | By analyzing the wind profiler data on two different snowy weather processes on 31 October and 9 November 2009 in Beijing. It is found： （1） The easterly flow established at lower levels 2 hours before the start of snowfall, and there occurred a phenomenon that the wind suddenly strengthened, which has reference value for forecasting the start of snowfall. （2） There existed cold advection at 700 hPa and above, or cold advection enhancement, which is also a sign of the snowfall start. （3） The profiles .of temperature advection calculated from the wind profile data can reflect the atmospheric stability conditions and provide a reliable basis for determining whether the snow is convective. Therefore, it has great significance for critical weather nowcasting to strengthen the＇wind profile and temperature adveetion profile monitoring. |
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| Keywords: | snow nowcasting wind profile vertical velocity temperature advection |
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