doi:  10.3878/j.issn.1006-9895.1802.17217
中尺度地形对登陆台风“莫兰蒂”(2016)长生命史强对流雨带组织发展影响的模拟研究

A Numerical Study on the Impacts of Mesoscale Topography upon the Organization and Development of Long-lasting Intensive Convective Rain-band of Landfall Typhoon “Meranti” (2016)
摘要点击 216  全文点击 36  投稿时间:2017-08-21  修订日期:2017-11-06
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基金:  国家自然科学基金项目(41675047、41405106)和厦门市科技惠民计划项目(3502Z20164080、3502Z20174052)
中文关键词:  台风,特大暴雨,中尺度地形,数值模拟
英文关键词:  typhoon, extremely heavy rain, mesoscale topography, numerical simulation
  
作者中文名作者英文名单位
赵玉春Zhao Yuchun海峡气象开放实验室
引用:赵玉春.2018.中尺度地形对登陆台风“莫兰蒂”(2016)长生命史强对流雨带组织发展影响的模拟研究[J].大气科学
Citation:Zhao Yuchun.2018.A Numerical Study on the Impacts of Mesoscale Topography upon the Organization and Development of Long-lasting Intensive Convective Rain-band of Landfall Typhoon “Meranti” (2016)[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      2016年9月14~15日超强台风“莫兰蒂”登陆厦门后在福建中北部引发了特大暴雨天气过程,特大暴雨由台风登陆后北侧至东北侧一个缓慢移动的长生命史中尺度强对流螺旋雨带活动造成。利用中尺度数值模式WRF(V3.9)对台风登陆引发福建中北部特大暴雨过程进行了大区域无嵌套数值模拟,较准确地模拟了台风特大暴雨的强度和落区,并成功地再现了台风登陆后北侧至东北侧长生命史中尺度强对流螺旋雨带的发生发展过程。分析发现,台风大风区外围几个零散的中尺度辐合区在移入台湾地形下游的弱风切变区、正涡度带、湿静力能(假相当位温、比湿)锋区后,组织发展成一个带状的中尺度辐合带而形成强对流螺旋雨带,长时间地维持和发展,并向东北方向缓慢移动。台湾地形在有利于中尺度强对流螺旋雨带发展维持的弱风切变区、正涡度带、湿静力能锋区的形成中起到了极为重要的作用。地形敏感性试验的结果进一步证实了台湾地形在台风登陆后东北侧长生命史中尺度强对流螺旋雨带形成及维持中的重要作用。
Abstract:
      The super Typhoon “Meranti” landed at Xiamen and produced an extremely heavy rain in the central-northern Fujian province on 14-15 Sep 2016. A slow-moving long-lasting intensive convective spiral rain-band in the north and northeast part of typhoon circulation leaded to the extremely heavy rain after the typhoon made its landfall. A large-domain numerical modelling without nesting was carried out to simulate the extremely heavy rain produced by the landfall Typhoon “Meranti” using mesoscale numerical model WRF (V3.9). The model accurately simulated the intensity and location of the extremely heavy rain, and successfully reproduced the formation and development of the long-lasting intensive convective spiral rain-band after the typhoon making its landfall. Results analysis indicates that several scattered mesoscale convergences are organized into a mesoscale convergence band and trigger intensive convective spiral rain band, which maintains and develops for a long time and moves northeastward slowly, after they move into the area of weak-wind shear, positive vorticity band and moist static energy (pseudo equivalent potential temperature, specific humidity) front in the downstream of Taiwan topography. The Taiwan topography plays a very important role in the formation of the area of weak-wind shear, positive vorticity band and moist static energy front, which is favorable for the maintenance and development of mesoscale intensive convective spiral rain-band. The results of topographic sensitivity experiment further verify the important role of Taiwan topography in the formation and sustenance of the long-lasting intensive convective spiral rain-band in the northeast part of typhoon circulation after the typhoon making its landfall.
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