On Vortical Mesoscale Disturbances Observed During the Period of Heavy Snow or Rain in the Hokuriku District
On Vortical Mesoscale Disturbances Observed During the Period of Heavy Snow or Rain in the Hokuriku District
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北陆地区大雪雨期间涡流中尺度扰动研究
DOI：
10.2151/jmsj1965.45.2_166
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发表时间：
1967
影响因子：
3.1
通讯作者：
S. Miyazawa
中科院分区：
文献类型：
--
作者：
S. Miyazawa
在北陆地区大雪或暴雨集中期间，雷达经常观测到涡旋中尺度扰动。这些涡旋扰动的特点是直径约为50至80公里，是龙卷风的100倍，比台风小一个数量级，可归类为中气旋。雷达观测显示明显的螺旋形或环状雷达回波，与涡旋扰动相对应。它们通常在海岸附近发展。穿过平原，消失在北陆区的山区，寿命只有几个小时。此外，还发现强而集中的雪或雨有时发生在这些涡旋扰动的路径上，降水的强度可以通过风辐散和台风所致的涡旋雨的概念来估计。
During the period of heavy and concentrated snow-or rainfall in the Hokuriku District, vortical mesoscale disturbances have often been observed by radar. These vortical disturbances are characterized by a diameter of about 50 to 80 km, which is 100 times as large as that of tornado, and one order of magnitude smaller than that of typhoon, and may be classified as mesocyclone. Radar observations show the remarkable spiral or ring-shaped radar echoes corresponding to vortical disturbances. They usually develop off the coast. move across the plain and disappear in the mountain area of the Hokuriku District, having the lifetime of several hours. Further, it was found that the heavy and concentrated snow-or rainfalls sometimes took place along the track of these vortical disturbances, and that the intensity of precipitation may be estimated by means of wind divergence and the concept of vortical rain like the rain due to typhoon.