An Investigation of a Polar Low with a Spiral Cloud Structure
An Investigation of a Polar Low with a Spiral Cloud Structure
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对具有螺旋云结构的极地低压的研究
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
E. Rasmussen
中科院分区：
文献类型：
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作者：
E. Rasmussen
摘要本文介绍了一个天气学个例研究，其中一个小尺度低压，即所谓的极地低压，在从冰岛到北海约2000公里的地面图上可以作为一个闭合环流来跟踪。卫星图像显示，极地低气压形成了一种非常像热带气旋的对流云。1000-500毫巴的厚度场表明，在极低压最发达的时期，极低压有一个暖核。结果表明，本文所讨论的极低压可能是一种不同于逗点云的现象，也不同于与对流层中层强正涡度平流相关的小尺度涡。
Abstract A synoptic case study where a small-scale low, a so-called polar low, can be followed as a closed circulation on the surface maps around 2O00 km from Iceland to the North Sea is presented. Satellite images show that the polar low develops a cloud pattern of convective clouds very much like that of a tropical cyclone. The 1000–500 mb thickness field shows that the polar low has a warm core during the time when it is best developed. It is concluded that the polar low discussed in this work probably is a phenomenon different from a comma cloud and also different from small-scale vortices associated with strong mid-tropospheric positive vorticity advection.