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Moisture Supply, Jet, and Silk-Road Wave Train Associated with the Prolonged Heavy Rainfall in Kyushu, Japan in Early July 2020
SOLA ( IF 1.9 ) Pub Date : 2021-06-01 , DOI: 10.2151/sola.2021-019
Takeshi Horinouchi 1 , Yu Kosaka 2 , Hiroshi Nakamigawa 3 , Hisashi Nakamura 2 , Norihisa Fujikawa 3 , Yukari N. Takayabu 4
Affiliation  

A prolonged heavy rainfall event occurred in Kyushu in early July 2020. Its large-scale environmental factors are investigated with observational and reanalysis data. Seven-day precipitation and moisture flux convergence around Kyushu were the greatest among the last 30 years. This pronounced convergence was maintained by nearly steady moisture influx, and the persistent upper-level trough to the northwest enhanced the ratio of moisture convergence to the influx. The magnitude of instantaneous moisture flux, however, was not particularly large among those along the subtropical jet axis or the Meiyu-Baiu rainband. What made this event unique is the persistence of the moisture flux peak anchored around Kyushu under the influence of the Silk-Road teleconnection. In June 2020, three upper-level troughs, whose easternmost one corresponding to the aforementioned trough, tend to form along the subtropical Asian jet. This wave train was persistent in the month and lasted until mid-July, 2020. Our analysis suggests that, prior to the rainfall event, the Silk-Road teleconnection was intensified through an interaction with a wave train at subpolar latitudes, which involves nonlinear processes including trough cut-off.



中文翻译:

与 2020 年 7 月上旬日本九州持续大雨有关的水分供应、急流和丝绸之路波列

2020 年 7 月上旬,九州发生持续性强降雨事件。通过观测和再分析数据调查其大尺度环境因素。九州周围的 7 天降水和水分通量辐合是过去 30 年中最大的。这种明显的辐合是由近乎稳定的水分流入维持的,而西北部持续存在的上层槽增强了水分辐合与流入的比率。然而,在亚热带急流轴或梅雨-白宇雨带的瞬时水分通量的大小并不是特别大。这一事件的独特之处在于在丝绸之路遥相关的影响下,锚定在九州周围的水分通量峰值的持续存在。2020年6月,三个上层低谷,其最东端对应于上述低压槽,倾向于沿着亚热带亚洲急流形成。该波列在本月持续存在,一直持续到 2020 年 7 月中旬。我们的分析表明,在降雨事件之前,丝绸之路遥相关通过与次极纬度的波列相互作用而加强,这涉及非线性过程包括波谷截断。

更新日期:2021-05-31
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