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首页> 外文期刊>Journal of the Meteorological Society of Japan >A Nonclassical Gust Front and a Solitary Wave Embedded within a Typhoon as Observed with Doppler Radar and Wind Profiler
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A Nonclassical Gust Front and a Solitary Wave Embedded within a Typhoon as Observed with Doppler Radar and Wind Profiler

机译：多普勒雷达和风廓线仪观测到的非经典阵风锋和台风中嵌入的孤波

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摘要

Observations from a Doppler radar, a wind profiler, and a meteorological tower were used to study the evolution of two thin-line echoes that were observed in the radar reflectivity field over the Kanto Plain of Japan as Typhoon Higos (0221) passed in October 2002. Both thin-line echoes were accompanied by gusty winds and followed by cold airflows, and both passed the field site of the Meteorological Research Institute (MRI) in Tsukuba, Japan. Data from the MRI instrument array and from a surface observation network revealed that the first thin-line echo was Caused by a gust front, and the second thin-line echo was caused by a solitary wave. Although it was demonstrated that the first thin-line echo was due to a gust front, this gust front could not be categorized as a so-called thunderstorm gust front because it had no parent thunderstorm; rather, Doppler radar and wind profiler observations suggested that both relatively strong (similar to 4 m s(-1)) downdrafts and large momentum transported by the downdrafts from aloft (similar to 4 km) to lower levels produced and enhanced near-surface winds behind the gust front. In contrast, the solitary wave associated with the second thin-line echo likely developed as another gust front that generated from an outer rainband to the south of the typhoon center met a stable layer formed by the cold outflow behind the gust front associated with the first thin-line echo. The ducting mechanism that enabled the solitary wave to propagate was also revealed from the wind profiler and radiosonde measurements.
机译：利用多普勒雷达，风廓线仪和气象塔进行的观测研究了两条细线回声的演变，这两种细线回声是在日本关东平原上的雷达反射率场中观测到的，这是因为台风希哥斯（0221）在2002年10月通过两条细线回波都伴随着阵风和冷气流，都通过了日本筑波市气象研究所（MRI）的现场。来自MRI仪器阵列和表面观测网络的数据显示，第一条细线回声是由阵风锋引起的，第二条细线回声是由孤波引起的。尽管已证明第一条细线回波是由于阵风锋引起的，但由于没有父雷暴，该阵风锋不能归类为所谓的雷暴阵风锋。相反，多普勒雷达和风廓线仪的观测结果表明，相对强的下降气流（类似于4 ms（-1））和下降气流从高空传输（大约4 km）到较低水平产生的大动量都会产生并增强后面的近地面风阵风阵线。相比之下，与第二条细线回波相关的孤立波很可能发展为从台风中心以南的外部雨带产生的另一个阵风锋，遇到了由与第一条相关的阵风锋后面的冷流出形成的稳定层。细线回声。风廓线仪和探空仪的测量结果也揭示了使孤立波传播的风管机制。

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