Axisymmetric Hurricane in a Dry Atmosphere: Theoretical Framework and Numerical Experiments
Axisymmetric Hurricane in a Dry Atmosphere: Theoretical Framework and Numerical Experiments
复制标题
干燥大气中的轴对称飓风：理论框架和数值实验
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
O. Pauluis
中科院分区：
文献类型：
--
作者：
A. Mrowiec;S. Garner;O. Pauluis
本文讨论了无水汽大气中飓风的可能存在，分析了潮湿和干燥环境中模拟的类飓风风暴的动力和热力学结构。首次证明了轴对称飓风的“势强”理论直接适用于维持由表面能量和动量通量共同维持的平衡涡旋，即使在没有水汽的情况下也是如此。高分辨率数值模式的模拟结果证实了这一理论认识。然后，同样的模型被用来比较干燥和潮湿的飓风。虽然发现这两种类型的风暴在理论框架内表现出许多相似之处并很好地吻合，但也有几个不同之处，最明显的是在风暴流入以及飓风大小和强度之间的关系上。这些差异表明，尽管水汽不是维持飓风状涡旋所必需的，但潮湿的过程直接影响这些风暴的结构。
This paper discusses the possible existence of hurricanes in an atmosphere without water vapor and analyzes the dynamic and thermodynamic structures of simulated hurricane-like storms in moist and dry environments. It is first shown that the ‘‘potential intensity’’ theory for axisymmetric hurricanes is directly applicable to the maintenance of a balanced vortex sustained by a combination of surface energy and momentum flux, even in the absence of water vapor. This theoretical insight is confirmed by simulations with a high-resolution numerical model. The same model is then used to compare dry and moist hurricanes. While it is found that both types of storms exhibit many similarities and fit well within the theoretical framework, there are several differences, most notably in the storm inflow and in the relationship between hurricane size and intensity. Such differences indicate that while water vapor is not necessary for the maintenance of hurricane-like vortices, moist processes directly affect the structure of these storms.