Influence of a Distantly Located Typhoon, a Weak Westerly Trough and Orography on the Intense Rainfall on 14-15 September 1965 over Gifu and Fukui Prefectures of Japan
Influence of a Distantly Located Typhoon, a Weak Westerly Trough and Orography on the Intense Rainfall on 14-15 September 1965 over Gifu and Fukui Prefectures of Japan
复制标题
远距离台风、弱西风槽和地形对1965年9月14日至15日日本岐阜县和福井县强降雨的影响
DOI：
10.2151/jmsj.2013-405
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
K. Ninomiya
中科院分区：
文献类型：
--
作者：
K. Ninomiya
利用欧洲中期天气预报中心40年再分析资料和高空、地面和局地雨量计观测资料，研究了一个远地台风（TY）、一个弱西风槽和地形对1965年9月14 ~ 15日日本中部阜县和福井县（~36°N, 137°E）强降雨的影响。强降水发生前，一条长弧形水汽锋于9月13日在远离日本的tytix（6524）外环流北缘增强。日本太平洋沿岸长雨带出现50 ~ 100 mm d−1的降水，与低空水汽锋辐合有关。九月十四日，在对流层中部一个弱西风短波槽的影响下，日本海上空形成一个小型低气压。对流层下层，一条Λ-shaped低压槽从低压外环流向低压延伸，水汽锋局部向低压北伸。同时，随着水汽锋的突出，一个中尺度（~500 km）强雨区向北突出。在中α尺度强雨区，14日在铃鸟—井木山脉东侧形成了南北向的窄雨带。雨带最大降水约800 mm d−1。本例可能属于“受TY远程影响的强降水”，但与以往文章研究的其他情况不同，强降水发生在弱西风短波槽影响下沿山形成的狭窄的南北向雨带内。
Influence of a distantly located typhoon (TY), a weak westerly trough, and orography on the intense rainfall on September 14̶15, 1965 over Gifu and Fukui Prefectures (~36°N, 137°E) in central Japan is studied by using European Center for Medium-Range Weather Forecasts 40-year reanalysis data and upper, surface, and local rain-gauge observation data. Prior to the intense rainfall, a long arc-shaped moisture front was intensified on September 13 along the northern periphery of the outer circulation of TY Tix (6524), which was distantly located from Japan. A rainfall of 50̶100 mm d −1 occurred in a long rainbelt along the Pacific coast of Japan, associated with the low-level convergence in the moisture front. A small depression formed over the Japan Sea on September 14 under the influence of a weak westerly shortwave trough in the middle troposphere. In the lower troposphere, a Λ-shaped trough extended from the outer circulation of the TY toward the depression and the moisture front protruded locally northward to the depression. Concurrently, with the protrusion of the moisture front, a meso-α-scale (~500 km) intense rainfall area protruded northward. In the mesoα-scale intense rain area, a south̶north oriented narrow rainband formed along the east side of Suzuka-Ibuki Mountains on September 14. A maximum precipitation of ~800 mm d −1 occurred in the rainband. This case may fall under “intense rainfall remotely affected by TY.” However, the present case is different from other cases studied in previous articles in that very intense precipitation occurred in a narrow south̶north oriented rainband formed along mountains under the influence of the weak westerly shortwave trough.