Heating by organized convection as a source of polar low intensification
Heating by organized convection as a source of polar low intensification
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通过有组织的对流加热作为极地低强度的来源
DOI：
10.3402/tellusa.v39i4.11769
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发表时间：
1987
期刊：
影响因子：
2
通讯作者：
H. Økland
中科院分区：
文献类型：
--
作者：
H. Økland
本文讨论了一些观察到的特性，没有考虑到在以前的理论研究。例如，当观测到极地低压时，一个混合良好的对流边界层是天气形势的一个共同特征。然而，在极地低压本身，对流似乎达到了更高的水平。此外，许多极地低压有一个特征性的中心区域，具有特别强的风和大的涡度。一个简单的线性CISK模式被用来估计由对流引起的加强。该模型是基于一个良好的混合对流层的假设所施加的约束。云物理学的元素被用来解释观测到的云和降水的特征。最后，它表明，额外的增长率可能是预期的，如果CISK是存在于大的相对涡度的环境中。根据本文提出的一般思想，对一个观察到的案例进行了研究。DOI：10.1111/j.1600-0870.1987.tb00317.x
The paper discusses some observed characteristics which have not been taken into account in previous theoretical studies. For instance, a well-mixed convective boundary layer is a common feature of the synoptic situation when polar lows are observed. However, in the polar lows themselves, the convection seems to reach much higher levels. Also, many polar lows have a characteristic central domain with especially strong winds and large vorticity. A simple linear CISK model is used to estimate the intensification caused by the convection. The model is based on constraints imposed by the assumption of a well-mixed convective layer. Elements of the cloud physics are used to explain observed characteristics of clouds and precipitation. Finally, it is shown that additional growth rate may be expected if CISK is present in an environment of large relative vorticity. An observed case is studied in the light of the general ideas set forth in this paper. DOI: 10.1111/j.1600-0870.1987.tb00317.x