| 台风“利奇马”引发山东强降水成因分析 |
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| 作者姓名： | 王楠喻 王雪 娄盼星 林曲凤 吴彦洁 秦璐 孙世军 |
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| 作者单位： | 烟台市气象局;北京玖天气象科技有限公司;华风气象传媒集团有限责任公司;陕西省气象科学研究所;中国海洋大学物理海洋教育部重点实验室和青岛海洋科学与技术国家实验室;烟台市牟平区气象局;山东省电力公司应急管理中心 |
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| 基金项目： | 山东省气象局科研项目(SDYBY2018-09);国家自然科学基金项目(41975065);国网2019年度科技项目(520613180060)。 |
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| 摘 要： | 利用常规气象观测资料、台风最佳路径数据集资料、地面-卫星-雷达三源融合逐小时降水产品(0.05°×0.05°)、FY-2G云顶亮温(0.1°×0.1°)、NCEP/NCAR FNL(1°×1°)再分析资料,对2019年9号台风“利奇马”影响期间2019年8月11日发生的山东特大暴雨过程进行分析。结果表明:1)强降水主要受台风倒槽的影响,台风倒槽在山东中部暴雨区长时间稳定维持,台风东侧的低空东南急流把东海北部的水汽和能量向暴雨区输送,配合200 hPa高空急流的“抽吸作用”,在暴雨区上空辐合抬升,造成具有中尺度特征的暴雨。2)强降水区存在的正涡度区伴随强烈的上升运动、低层辐合、高层辐散的结构和次级环流耦合发展,为此次台风暴雨过程提供了有利的动力条件,而且动力条件的演变在此次台风暴雨过程中的作用比热力条件更重要。3)850 hPa水汽通量辐合中心,以及相匹配的在垂直方向的强上升运动区,对强降水落区和雨强有一定的指示意义。
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| 关 键 词： | 台风“利奇马” 暴雨 台风倒槽 降水成因 |
Analysis on causes of heavy precipitation by Typhoon LEKIMA in Shandong |
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| Authors: | WANG Nanyu WANG Xue LOU Panxing LIN Qufeng WU Yanjie QIN Lu SUN Shijun |
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| Institution: | (Yantai Meteorological Bureau, Yantai 264000, China;Beijing JiuTian Meteorology Science & Technology Co., Ltd, Beijing 100081, China;Huafeng Meteorological Media Group Co., Ltd, Beijing 100081, China;Shaanxi Institute of Meteorological Sciences, Xi'an 710016, China;Key Laboratory of Physical Oceanography (Ocean University of China) of Ministry of Education and Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266100, China;Muping Meteorological Bureau of Yantai, Yantai 264100, China;Emergency Management Center of Shandong Electric Power Company, Jinan 250001, China) |
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| Abstract: | Based on conventional observation data,typhoon best-track dataset,gauge-satellite-radar combined hourly precipitation products(0.05°×0.05°),black-body temperature from FY-2G satellite(0.1°×0.1°),and NCEP/NCAR FNL reanalysis data(1°×1°),the heavy rainstorm in Shandong on 11 August 2019 triggered by Typhoon LEKIMA is analyzed.The results are listed as follows.1)The heavy precipitation is mainly affected by typhoon inverted trough that maintains for a long time in the rainstorm area in the central part of Shandong.The low-level southeast jet on the east side of the typhoon transports the water vapor and energy in the north of East China Sea to the rainstorm area,and combining with the pumping action of upper-level jet stream at 200 hPa,the water vapor converges and is lifted over the rainstorm area,which jointly result in the rainstorm with mesoscale characteristics.2)The positive vorticity area in the rainstorm area is accompanied with strong ascending motion by the configuration of low-level convergence and high-level divergence and the coupling of secondary circulation,which provides favorable dynamic conditions for the typhoon rainstorm,and the dynamic conditions are more important than thermal conditions for the rainstorm process.3)The water vapor flux convergence center at 850 hPa and corresponding vertical area of strong ascending motion have a good indication for predicting the heavy precipitation area and intensity. |
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| Keywords: | Typhoon LEKIMA heavy precipitation typhoon inverted trough cause of precipitation |
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