| 摘要: |
| 多普勒激光雷达在台风等强天气背景下的探测能力亟待研究，为此将多普勒激光雷达与70 m测风塔超声风温仪在同址同高度探测台风“利奇马”影响期间的边界层风场数据进行对比，并分析多普勒激光雷达的误差分布以及变化情况。结果显示：在高度70 m上，两者的水平风速、风向相关系数分别为0.97和0.99，垂直风速的相关系数为0.36。以超声风温仪为参考值，激光雷达水平风速、垂直风速和风向均方根误差分别为1.06 m/s、0.46 m/s和17.10 °。深入研究表明：降水对多普勒激光雷达测量水平风速和垂直风速误差均有一定影响。当激光雷达信噪比大于2 000时，各参量的误差与信噪比呈负相关关系。研究表明多普勒激光雷达至少可以较好地刻画台风环流内的水平风场结构及演变，可应用于台风外围环流影响下(即较弱降雨条件下)边界层风场的高分辨率探测和研究。 |
| 关键词: 台风 多普勒激光雷达 超声风温仪 边界层风结构 |
| DOI：10.16032/j.issn.1004-4965.2020.053 |
| 分类号: |
| 基金项目: |
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| ANOMALOUS SYNOPTIC PATTERN OF TYPICAL DRAGON BOAT PRECIPITATION PROCESS IN GUANGDONG PROVINCE |
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QIAN Wei-hong1,2, AI Yang3, CHEN Lyu-wen14, CHEN Lyu-wen14, CHEN Lyu-wen14, CHEN Lyu-wen14, CHEN Lyu-wen14
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1. Guangzhou Institute of Tropical and Marine Meteorology/ Guangdong Provincial Key Laboratory
of Regional Numerical Weather Prediction, CMA, Guangzhou 510641, China;2. Department of Atmospheric and Oceanic Sciences, Peking University, Beijing 100871, China;3.Department of Atmospheric and Oceanic Sciences, Peking University, Beijing 100871, China;4.Guangzhou Institute of Tropical and Marine Meteorology/ Guangdong Provincial Key Laboratory
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| Abstract: |
| During the Dragon Boat rainy season (the time around the Dragon Boat Festival), there are usually some parallel bands in the precipitation area, and extreme rainstorm could cause disasters like flood and landslide. The current study decomposes atmospheric variables into temporal climatology and anomalous components and uses the latter to reveal the basic features of extreme rainfall during the Dragon Boat rainy season. The central and northern regions of Guangdong Province experienced an extreme rainstorm process accompanied by parallel rainfall bands and lightning high-density zones from 5 to 9 June 2020. This process happened in the relatively weak anomalous low over the central and southern parts of the country. Results showed two anomalous anticyclone systems, situated at the Yellow Sea and the northern South China Sea respectively, controlled the movement and location of the anomalous low. Meanwhile, the anomalous convergence lines and moist vorticity anomaly lines indicated the location of rainstorms in the anomalous low area. These features can be extracted from the product of ECMWF model 1~5 days in advance, to be useful to predict the rainfall storms during the Dragon Boat rainy season. |
| Key words: Dragon Boat rainy season rainstorm lightning model product anomalous system |
