周芯玉,程正泉,涂静,肖婷,高晓荣. 2020. 1804号台风Ewiniar非对称降水及动热力结构演变特征分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.065
1804号台风Ewiniar非对称降水及动热力结构演变特征分析
Analysis on asymmetrical precipitation and the evolution of dynamic and thermodynamic structure of typhoon Ewiniar(1804)
投稿时间:2020-02-28  修订日期:2020-07-02
DOI:10.11676/qxxb2020.065
中文关键词:  Ewiniar台风,非对称降水,环流背景,结构演变
英文关键词:Typhoon Ewiniar, Asymmetrical precipitation, Circulation background, Evolution of structure
基金项目:广东省自然科学基金面上项目
作者单位E-mail
周芯玉 广州市气象台 xiao-yu1985114@163.com 
程正泉 Guangdong Meteorological Observatory 263421556@qq.com 
涂静 Guangdong Meteorological Observatory 375834995@qq.com 
肖婷 Guangzhou Meteorological Observatory 578452106@qq.com 
高晓荣 Guangzhou Meteorological Observatory 1255232063@qq.com 
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中文摘要:
      1804号台风Ewiniar第二次登陆广东过程中降水表现出显著的非对称分布特征,强降水主要位于其路径右侧。利用欧洲中期天气预报中心ERA5再分析资料、广东风廓线雷达观测资料以及实况降水观测资料,对造成非对称降水的环流背景和动热力结构演变特征进行了分析。结果表明:Ewiniar左右两侧水汽输送及动力、热力条件差异是造成非对称降水的主要原因。加强的低空急流以及1805号台风Maliksi水汽的输送为台风右侧强降水的产生提供了更好的水汽背景,而低空急流的加强配合高空强的辐散抽吸使得右侧垂直上升运动也明显大于左侧。边界层内,强盛的低空急流以及珠三角地区下垫面强摩擦辐合作用导致Ewiniar右前侧径向入流强度更强、强入流层厚度更厚、边界层高度更高,且由于距离台风眼墙越近风速越大,上述现象表现得越明显,从而为强降水的产生提供了更好的动力和水汽条件。强降水期间Ewiniar右侧低层大气持续维持不稳定状态,分析表明强低空急流携带的θse平流以及其随高度的减弱弥补了强降水造成的能量损耗,是不稳定能量维持的重要原因。
英文摘要:
      Before and after the second landing of typhoon Ewiniar(1804) in Guangdong, the precipitation shows significant asymmetric distribution characteristics, and the heavy precipitation is mainly located on the right side of its path. Based on the reanalysis data of ECMWF ERA5, wind profiler observations data and the rainfall observation data, the circulation background and the evolution characteristics of the dynamic and thermal structures that cause the asymmetric precipitation are analyzed. The results show that the difference of water vapor transport, dynamic and thermal conditions between the left and right sides of Ewiniar is the main cause of asymmetric precipitation. The enhanced low-level jet and the water vapor transport of typhoon Maliksi(1805) provide a better water vapor background for the occurrence of heavy rainfall on the right side of typhoon, and the enhancement of the low-level jet combined with the strong divergence and suction at the high-level make the vertical upward movement of the right side also significantly larger than that of the left side. In the boundary layer, the strong low-level jet and the strong friction and convergence of the underlying surface in the Pearl River Delta make the radial inflow more stronger, the thickness of the strong inflow layer more thicker and the height of the boundary layer more higher in the front right side of Ewiniar. Moreover, because of the closer to the typhoon eye wall, the greater the wind speed, so the above phenomenon is more obvious, which provide better dynamic and water vapor conditions for the generation of heavy rainfall. During the period of heavy rainfall, the lower atmosphere on the right side of Ewiniar kept unstable, the analysis shows that strong pseudo equivalent potential temperature advection and its weakening with height make up for the energy loss caused by heavy rainfall, which is an important reason for the maintenance of unstable energy.
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