Lobe dynamics applied to barotropic Rossby-wave breaking.
Lobe dynamics applied to barotropic Rossby-wave breaking.
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应用于正压罗斯贝波破碎的波瓣动力学。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
R. A. Plumb
中科院分区：
文献类型：
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作者：
T. Koh;R. A. Plumb
本文应用叶瓣动力学方法研究了正压涡旋斑块边缘的输运问题。所使用的模型捕捉了冬季平流层极地涡旋中细丝脱落的基本动力学。针对该问题，采用了两种方法：(1)识别出涡旋流的主导周期分量，并将周期动力系统的常规叶瓣动力学方法应用于涡旋流；(2)保留了完整的非周期、动态一致流，并使用改进的叶瓣动力学品牌来量化输运。我们的结果表明，在周期性情况下，由于重叠的侵入和挤压叶，在叶瓣动力学边界上发生了许多可逆输运。在非周期性的情况下，注意到少量的侵入，这与正压涡旋的位涡脱落是唯一向外的既定事实相反。在我们的讨论中，我们认为，虽然叶瓣动力学为量化传输提供了严格的框架…
We applied the methods of lobe dynamics to the problem of transport across the edge of a barotropic vortex patch. The model used captures the essential dynamics of filament shedding in the wintertime stratospheric polar vortex. Two approaches were adopted for the problem: (1) the dominant periodic component of the vortical flow was identified and conventional lobe dynamics methods for periodic dynamical systems were applied to it; (2) the full aperiodic, dynamically consistent flow was retained and a modified brand of lobe dynamics was used to quantify the transport. Our results show that in the periodic case, much reversible transport occurs across the lobe dynamical boundary due to overlapping intruding and extruding lobes. In the aperiodic case, a small amount of intrusion was noted, contrary to the well-established fact that potential vorticity shedding in barotropic vortices is uniquely outwards. In our discussion, we argue that while lobe dynamics provides a rigorous framework for quantifying transp...