Indirect Effects of Tropical Cyclones on Heavy Rainfall Events in Kyushu, Japan, during the Baiu Season
Indirect Effects of Tropical Cyclones on Heavy Rainfall Events in Kyushu, Japan, during the Baiu Season
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白雨季节热带气旋对日本九州强降雨事件的间接影响
DOI：
10.2151/jmsj.2012-303
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发表时间：
2012
影响因子：
3.1
通讯作者：
Hisanori Itoh
中科院分区：
文献类型：
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作者：
Kenji Yoshida;Hisanori Itoh
本文通过资料分析和数值试验研究了热带气旋(TC)对日本九州百伏季暴雨的间接影响。对1999年6月7日(日本夏令时)的暴雨过程进行了详细的分析。这次活动受到台风麦琪(9903)的远程影响，当时麦琪位于距离九州约2000公里的地方。当台风麦琪靠近台湾时，台湾以北出现一个高位涡(PV)区。台湾以东同时形成一个低PV区，对应于太平洋高压向西北延伸。这些动力变化导致高湿度区和低湿度区之间的偏南水汽通量增强，导致九州附近的水汽辐合和暴雨。在此期间，台风麦琪还造成了一个单独的热带扰动向北平流。台湾以北的高PV区是台风麦琪环流与台湾地形相互作用产生的非绝热加热所致。相比之下，低PV区是由台风Maggie从低纬地区平流而来的。分段PV逆温诊断表明，低PV区对偏南水汽通量的贡献最大，台风Maggie和高PV区也起到了积极作用。数值试验表明，台湾地形和热带附加扰动向北平流都使九州及周边地区降水增加。这项研究发现了一种新的机制，即TCS的间接作用。这一机制的核心要素是九州以南的大水汽通量，被称为“水汽之路”，并讨论了它与“大气河流”的区别。这一机制并不是台风玛吉独有的，因为九州及其周边地区的其他强降雨案例也与类似情况有关。通讯作者：吉田健二，日本气象厅，东京千代田区大手町1-3-4,100-
This study examines the indirect effect of tropical cyclones (TCs) on cases of heavy rainfall during the Baiu season in Kyushu, Japan using data analyses and numerical experiments. A detailed analysis of the heavy rainfall event that occurred on 7 June 1999 (JST) is performed. This event was remotely affected by Typhoon Maggie (9903), which was located approximately 2000 km from Kyushu at the time. As Typhoon Maggie passed close to Taiwan, a high potential vorticity (PV) zone appeared to the north of Taiwan. A low PV region formed simultaneously to the east of Taiwan, corresponding to a northwestward extension of the Pacific high. These dynamical changes induced an enhanced southerly moisture flux between the high PV zone and the low PV region, leading to moisture convergence and heavy rain in the vicinity of Kyushu. During this time, Typhoon Maggie also caused the northward advection of a separate tropical disturbance. The high PV zone to the north of Taiwan was produced by diabatic heating associated with interplay between the circulation of Typhoon Maggie and the topography of Taiwan. In contrast, the low PV region was formed through the advection of low-PV air from low latitudes by Typhoon Maggie. A piecewise PV inversion diagnostic shows that the low PV region was the largest contributor to the southerly moisture flux, although both Typhoon Maggie and the high PV zone also made positive contributions. Numerical experiments reveal that the precipitation in and around Kyushu was enhanced by both the topography of Taiwan and the northward advection of the additional tropical disturbance. This study identifies a new mechanism as an indirect effect of TCs. The core element of this mechanism is a large moisture flux south of Kyushu, which is termed “moisture road,” and the difference from “atmospheric river” is discussed. This mechanism is not unique to Typhoon Maggie, as other cases of heavy rainfall in and around Kyushu are associated with similar situations. Corresponding author: Kenji Yoshida, Japan Meteorological Agency, 1-3-4, Otemachi, Chiyoda-ku, Tokyo 100-
影响因子：
1.9
作者：
K. Yamada;R. Kawamura
通讯作者：
K. Yamada;R. Kawamura
西北太平洋对流层环流与热带气旋接近/登陆日本之间的关系。
DOI：
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发表时间：
2007
期刊：
日本気象学会気象集誌 85
影响因子：
--
作者：
Nakazawa;T. and K. Rajendran
通讯作者：
T. and K. Rajendran