A Bore-like Disturbance Observed in the Kanto Plain Area
A Bore-like Disturbance Observed in the Kanto Plain Area
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关东平原地区观测到的类似钻孔的扰动
DOI：
10.2151/jmsj.79.1257
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发表时间：
2001
影响因子：
3.1
通讯作者：
Kaoru Hoshino
中科院分区：
文献类型：
--
作者：
Y. Ogura;Kaoru Hoshino
1991年11月28日午夜前不久，东京（羽田）机场在短时间内接连遭到两次大风袭击。这些阵风造成了机场遭受的一些航空危害。本文主要通过分析气象台的自动记录和AMeDAS（自动气象数据采集系统）数据，探讨了这次事件的性质和原因。结果发现，当一个孤立的中尺度迁移扰动与一个与温带气旋有关的强烈低空西南气流相撞时，在机场发生了风向和速度的突变。进一步表明，该扰动以13 ~ 16 ms-1的相速度沿关东平原中部向东或东南方向移动。其水平维数约为30 km，扰动过程中不仅伴随着风的突变，而且伴随着气压和温度的突变。所有这些特征在类似牵牛花的钻孔中都很常见，当中性层下面的稳定层受到外部干扰时，就会形成牵牛花。因此，可以得出结论，在这种情况下检测到的扰动是一种类型的内孔。然而，其产生机制尚不清楚。据作者所知，这是第一篇记录在日本观察到的类似钻孔的扰动的论文。
Shortly before midnight of 28 November 1991, the Tokyo (Haneda) airport was hit by two wind bursts in short succession. These gusty winds were responsible for some aviation hazards the airport suffered from. This paper investigates the nature and cause(s) of this event, mainly through the analysis of autographic records from the meteorological observatories and AMeDAS (Automated Meteorological Data Acquisition System) data. It is found that abrupt changes in wind direction and speed occurred at the airport, when an isolated, mesoscale migrating disturbance impinged into a strong low-level southwesterly flow associated with an extratropical cyclone. It is further revealed that the disturbance traveled across the central part of the Kanto Plain toward the east or southeast with the phase speed of 13-16 ms-1. Its horizontal dimension was roughly 30 km, and the disturbance was accompanied by not only abrupt changes in wind, but also abrupt increases in pressure and temperature at the passage time of the disturbance. All these characteristics are common in the Morning-Glory-like bore, which is known to develop when a stable layer underlying a neutral layer is disturbed by an external disturbance. Thus, it is concluded that the disturbance detected in this case is a type of the internal bore. Its generating mechanism remains unclear, however. To the best knowledge of the authors, this is the first paper that documents a bore-like disturbance observed in Japan.