Upper-level trajectories in the prototype problem for tropical cyclone intensification,Quarterly Journal of the Royal Meteorological Society

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Upper-level trajectories in the prototype problem for tropical cyclone intensification
Quarterly Journal of the Royal Meteorological Society ( IF 3.0 ) Pub Date : 2021-06-16 , DOI: 10.1002/qj.4110
Shanghong Wang _{1,

2} , Roger K. Smith ₁

Affiliation

Data from an idealized three-dimensional numerical simulation of tropical cyclone intensification are used to calculate Lagrangian air parcel trajectories emanating from the inflow layer that develops beneath the upper-tropospheric outflow layer. It is found that about half of these trajectories end up in the outflow layer itself. The other half slowly subside to the mid- to upper troposphere, below the outflow layer, and drift slowly outwards as a result of a relatively weak overturning circulation in that region. Calculations show that pseudo-equivalent potential temperature is not approximately conserved along the air parcel trajectories, indicating that the turbulent diffusion of heat and moisture and/or the latent heat changes by freezing or melting along the trajectories is appreciable in the mid- and upper troposphere.

中文翻译：

热带气旋强化原型问题中的高层轨迹

来自热带气旋增强的理想化三维数值模拟的数据用于计算源自对流层上层流出层下方的流入层的拉格朗日气团轨迹。发现这些轨迹的大约一半最终在流出层本身中。另一半缓慢下沉到对流层中上层，流出层下方，并由于该地区相对较弱的翻转环流而缓慢向外漂移。计算表明，伪等效位温沿气团轨迹并不近似守恒，这表明在对流层中上层，热量和水分的湍流扩散和/或沿轨迹冻结或融化的潜热变化是可观的.

更新日期：2021-08-04

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