30-second-Update 100-m-Mesh Data Assimilation Experiments: A Sudden Local Rain Case in Kobe on 11 September 2014

30-second-Update 100-m-Mesh Data Assimilation Experiments: A Sudden Local Rain Case in Kobe on 11 September 2014
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30 秒更新 100 米网格数据同化实验:2014 年 9 月 11 日神户局部突发降雨事件

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发表时间:
2017
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通讯作者:
T. Miyoshi
T. Miyoshi
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作者:
Y. Maejima;Masaru Kunii;T. Miyoshi

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本文旨在研究30秒更新和100米分辨率资料同化(DA)对2014年9月11日神户市一个孤立对流系统引起的突发性局地暴雨预报的影响。我们利用大阪大学相控阵天气雷达(PAWR)每30秒一次的雷达反射率,利用日本气象厅的非静力模式(JMA-NHM)在1公里和100米分辨率下进行了局部集合变换卡尔曼滤波(LETKF)实验。1公里网格的试验表明,30秒更新的PAWR DA对分析和预报有积极的影响。此外,100m网格的试验在描述对流系统的降雨强度和细微结构方面也显示出明显的优势。这些有希望的结果表明,30秒更新、100米网格的DA在预报突发性局地降雨事件方面有很大的潜力。(引用:Maejima,Y.,M.Kunii和T.Miyoshi,2017:30秒-更新100米网格数据同化实验:2014年9月11日神户的一次突如其来的局地降雨过程。索拉,13岁,
This study aims to investigate the impacts of 30-second- update and 100-m-resolution data assimilation (DA) on a prediction of sudden local torrential rains caused by an isolated con- vective system in Kobe city on 11 September 2014. We perform a Local Ensemble Transform Kalman filter (LETKF) experiment with the Japan Meteorological Agency non-hydrostatic model (JMA-NHM) at 1-km and 100-m resolution using every-30-second radar reflectivity observed by the phased array weather radar (PAWR) at Osaka University. The 1-km-mesh experiment shows that 30-second-update PAWR DA has positive impacts on the analyses and forecasts. Moreover, the 100-m-mesh experiment shows significant advantages in representing the rainfall intensity and fine structure of the convective system. The promising results suggest that 30-second-update, 100-m-mesh DA have a great potential for predicting sudden local rain events. ( Citation : Maejima, Y., M. Kunii, and T. Miyoshi, 2017: 30-second-update 100-m-mesh data assimilation experiments: A sudden local rain case in Kobe on 11 September 2014. SOLA , 13 ,