Evolution Process and Multi-scale Structure of a Polar Low Developed over the Japan Sea on 11*12 December 1985 Part II: Meso-*-scale Low in Meso-*-scale Polar Low By
Evolution Process and Multi-scale Structure of a Polar Low Developed over the Japan Sea on 11*12 December 1985 Part II: Meso-*-scale Low in Meso-*-scale Polar Low By
复制标题
1985年12月11日12日日本海上空形成的极地低气压的演化过程和多尺度结构第二部分：极地低气压中*尺度低压
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Kaoru Hoshino
中科院分区：
文献类型：
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作者：
K. Ninomiya;Kaoru Hoshino
本文第一部分研究了1985年12月11*12日发生的一次极低气压（极气团中尺度低气压）的演变过程和结构。第二部分分析了极低压的精细结构。雷达和密集的地面观测资料表明，在极低气压内形成了一个与组织良好的螺旋回波带相关的中尺度低气压。中尺度低气压的水平延伸和生存时间分别为100 km和数h。极低压以50公里/小时的速度向东南移动，中尺度低压以30公里/小时的速度向东移动。中尺度低压成熟期中心经过时，阵风强度达到25 m/s，地面气压下降2 mb/30 min。在低气压中部估计了*100* 10-6秒-1和*-50* 10-6秒-1的地面风的相对涡度和辐合。厚的湿润中性层和极低压诱发的气旋流被认为是中尺度低压发展的有利环境。第二部分的一个重要结论是，当前极低压具有多尺度结构，即中*尺度极低压中存在一个中尺度涡旋。
The evolution process and structure of a polar low (meso-*-scale low in the polar airmass), which developed on 11*12 December 1985 are studied in Part I of the present study. The fine structure of the polar low is analyzed in Part II. Radar and dense surface observation data indicate the formation of a meso-*-scale low associated by well organized spiral echo bands within the polar low. The horizontal extension and the life time of the meso-*-scale low is '100 km and several hours, respectively. While the polar low moves southeastward with speed of '50 km/hour, the meso-*-scale low moves eastward with speed of *30 km/hour. Strong gust of '25 m/sec and the surface pressure fall of *2 mb/30 min are observed when the center of the meso-*-scale low at its mature stage passes over. The relative vorticity and convergence of the surface winds of*100* 10-6 sec-1 and *-50* 10-6 sec-1 are estimated over the central portion of the low. The thick moist neutral layer and the cyclonic flows induced by the polar low are considered to be a favorable environment for the developing of the meso-*-scale low. It is an important conclusion of Part II that the present polar low has a multi-scale structure, i. e., a meso-*-scale vortex in a meso-*-scale polar low.