doi:  10.3878/j.issn.1006-9895.1812.18193
垂直分辨率对广州“5.7”特大暴雨数值模拟影响的研究

The impact of vertical resolution at different levels on the numerical simulation of the torrential rain in Guangzhou on 7 May 2017
摘要点击 182  全文点击 83  投稿时间:2018-07-10  修订日期:2018-11-11
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基金:  国家重点基础研究发展计划(2013CB430105),国家自然科学(41675059, 41405059, 41375066 and U1333130).Supported by: the National Basic Research Program of China(2013CB430105), the National Natural Science Foundation of China (41675059, 41405059, 41375066 and U1333130).
中文关键词:  垂直分辨率、暖区暴雨、复杂地形、对流触发、对流组织化
英文关键词:  Vertical  resolution, warm  sector torrential  rain, complex  terrain, convective  trigger, convective  systematization
     
作者中文名作者英文名单位
王宁Wang Ning南京信息工程大学遥感与测绘工程学院
平凡Ping Fan南京信息工程大学遥感与测绘工程学院,中国科学院大气物理研究所(LACS)
引用:王宁,平凡.2019.垂直分辨率对广州“5.7”特大暴雨数值模拟影响的研究[J].大气科学
Citation:Wang Ning,Ping Fan.2019.The impact of vertical resolution at different levels on the numerical simulation of the torrential rain in Guangzhou on 7 May 2017[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      精细化的垂直分辨率能够更好地反映大气动热力环境和中尺度系统生消演变过程,不同层次高度垂直分辨率的加密对暖区对流系统触发及组织发展机制的影响有待深入研究。本文针对2017年5月6日(UTC)广州局地突发的特大暴雨受复杂地形影响、其对流中尺度系统局地触发、后向传播及组织化的特点,运用WRFV3.9.1,采用GFS资料较好地模拟和再现了此次大暴雨过程,并进行了不同高度垂直分辨率的敏感性试验,以探究垂直分辨率对此次暖区暴雨触发及组织化过程的影响。结果表明:低层垂直分辨率加密试验能够模拟出更强的偏南回流、偏东风和较强的低层风场辐合以及较强的温度扰动,进而引起更强的对流触发;中层垂直分辨率加密更有利于大范围的强干冷空气侵入对流系统,其造成的潜热和不稳定能量的释放,是对流系统发展的重要原因;高空垂直分辨率的加密试验则描述出了对流系统上部与高空急流出流相关的高空辐散中心、对流系统周围的高空强辐散中心以及相邻对流单体的垂直环流,细致再现了对流单体合并为对流系统的组织化过程。
Abstract:
      Refined vertical resolution can better reflects atmospheric dynamics-thermodynamics environment and the evolution processes of mesoscale systems. The impact of vertical resolution on the mechanism of trigger and organization development of convective system on warm sector needs to be studied further. This study simulated and reappeared the local Burst torrential rain in Guangzhou on 7 May 2017 well with WRFV3.9.1 model using the GFS data. Several sensitivity runs were performed by varying vertical resolution in different levels of the troposphere so as to illuminate the affection of the terrain, local triggering, backward propagation and organized processes during this rainstorm. The simulated results show that the higher vertical resolution at the low levels run (LOW62) simulated stronger southerly returning flow, easterly wind, low-level wind convergence and temperature disturbances, which led to a stronger convective trigger. The higher vertical resolution at the middle levels experiments (MID68) was beneficial to a wide range of strong dry and cold air intrusion into the convection system. The released latent heat and instability energy maybe the important reason for the development of convective system. The higher vertical resolution at the upper levels run (UPP71) not only described the upper divergence centers, which were related to outflow of upper level jet of the upper convective system, but also the other high divergence center around convective system were simulated well.
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