| 北京地区3000 m以下低空颠簸的统计特征及其气象条件分析 |
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| 引用本文： | 金晨曦,郭文利,甘璐,王春玲.北京地区3000 m以下低空颠簸的统计特征及其气象条件分析[J].气象与环境学报,2019,35(5):18-26. |
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| 作者姓名： | 金晨曦 郭文利 甘璐 王春玲 |
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| 作者单位： | 北京市气象服务中心, 北京 100089 |
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| 基金项目： | 国家重点研发计划（2018YFF0300105）和北京市科技计划项目（D171100000717002）共同资助。 |
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| 摘 要： | 低空颠簸（3000 m以下）由于可供飞行员判断和处置的时间短，一旦发生容易造成重大安全事故。气象条件是引发低空颠簸最直接、最重要的因素。本文采用北京地区8部风廓线雷达测得的高时空分辨率资料，结合华北空管局气象中心记录的2016年北京地区20个低空颠簸个例，分析了低空颠簸的统计特征和影响低空颠簸的气象条件。结果表明：北京地区低空颠簸在冬季发生频次高，其中2月颠簸发生频次最高，在夏季发生频次低。影响低空颠簸的气象指标包括水平风速、水平风的垂直切变，水平风的水平切变、水平风的时间切变和垂直风速。通过计算各气象指标的数值，尝试给出了造成低空颠簸的气象指标阈值，即水平风速大于18 m·s-1，水平风的垂直切变大于10 m·s-1·km-1，水平风的水平切变大于0.1 m·s-1·km-1，水平风的时间切变大于10 m·s-1·h-1以及垂直风速大于2 m·s-1，以上气象指标任意一个达到阈值，即满足造成低空颠簸的气象条件。此项工作对低空颠簸的预报具有一定参考意义。
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| 关 键 词： | 低空颠簸 风廓线雷达 风速 |
| 收稿时间： | 2018-09-01 |
Statistics and possible sources of low-level turbulence below 3000 m and its meteorological condition in Beijing |
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| JIN Chen-xi,GUO Wen-li,GAN Lu,WANG Chun-ling.Statistics and possible sources of low-level turbulence below 3000 m and its meteorological condition in Beijing[J].Journal of Meteorology and Environment,2019,35(5):18-26. |
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| Authors: | JIN Chen-xi GUO Wen-li GAN Lu WANG Chun-ling |
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| Institution: | Beijing Meteorological Service Center, Beijing 100089, China |
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| Abstract: | The turbulence of aircraft is a leading cause of injuries to the passengers and crew.The characteristics of low-level (below 3000 m) turbulence in Beijing during 2016 were investigated using the pilot reports accumulated by the Beijing Meteorological Center of Civil Aviation Administration of China.The frequency of turbulence in winter is the highest,and that in summer is the lowest due to the seasonal variations of wind speed.To examine the possible sources of the low-level turbulence in Beijing,the wind profiler radar data with a 120 m vertical and 6 min temporal resolution were used.The results show that the major meteorological factors and their thresholds influencing the turbulence include the horizontal wind speed (18 m·s-1),vertical shear of horizontal wind (10 m·s-1·km-1),horizontal shear of horizontal wind (0.1 m·s-1·km-1),time shear of horizontal wind (10 m·s-1·h-1),and the vertical wind speed (2 m·s-1).This paper has reference value for forecasting the low-level turbulence. |
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| Keywords: | Low-level turbulence Wind profiler radar Wind speed |
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