基于多普勒测风激光雷达的低空急流观测研究
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马秋杰,女,硕士研究生,主要从事大气测量和激光探测研究,mqj@stu.ouc.edu.cn。

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国家重点研发计划项目(2018YFC0213101);国家自然科学基金项目(41375016,41471309)


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Observational study of low-level jet based on Doppler wind lidar
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    摘要:

    基于相干多普勒测风激光雷达于2018年8月在山东德州获取的为期一个月的风廓线观测数据,进行了低空急流的判定、识别与统计分析。参考BONNER对低空急流的判定标准,对1 500 m高度以下的每10 min平均风廓线数据进行低空急流识别与统计,急流发生频率仅为3.6%。参考张世丰对低空急流的判定标准,统计了350 m高度以下10 min平均风廓线的低空急流风速、高度、风向及风切变等结构特征。急流发生频率为24.9%,急流速度主要介于6~10 m·s-1之间,急流高度出现3个峰值,分别位于110 m、160 m和220 m左右,急流风向主要为偏东风和偏南风。结果表明,多普勒激光雷达可以获取高时空分辨率的风廓线数据,进而可以有效检测低空急流结构的存在及其特征。

    Abstract:

    Based on the wind field observations with the coherent Doppler wind lidar in August 2018 in Dezhou, Shandong, low-level jets (LLJs) are judged, identified, and statistically analyzed. The LLJ identification and statistics are conducted using 10-min averaged wind profile data below 1 500 m based on BONNER's criteria for judging LLJ and the frequency of LLJ is 3.6%. With reference to ZHANG Shifeng's criteria for judging LLJ, the speed, height, direction, and shear of LLJ are calculated using 10-min averaged wind profile below 350 m and the occurrence frequency reaches 24.9%. The jet speed is mainly between 6 and 10 m·s-1 and wind directions are mainly easterly and southerly. There are three peaks of jet height, which are located at about 110 m, 160 m and 220 m. It shows that Doppler wind lidar can effectively get wind profile data of high spatial resolution and thus detect the existence and characteristics of LLJ.

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马秋杰,李珍妮,宋小全,吴松华,李荣忠,涂爱琴.基于多普勒测风激光雷达的低空急流观测研究[J].海洋气象学报,2019,39(4):61-67.

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  • 收稿日期:2019-08-05
  • 最后修改日期:2019-11-11
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  • 在线发布日期: 2019-12-31
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