Are tropical cyclones possible over Titan’s polar seas?

Are tropical cyclones possible over Titan’s polar seas?
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泰坦极地海域上空可能出现热带气旋吗?

DOI:
10.1016/j.icarus.2013.01.023
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发表时间:
2013
期刊:
影响因子:
3.2
通讯作者:
Tokano
Tokano
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tokano

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虽然在泰坦的正压对流层中不可能出现温带气旋,但在泰坦的极地碳氢化合物海洋上,从海洋蒸发的潜热中获得能量的热带气旋也不能完全消失。土卫六上热带气旋形成的最基本条件是极地海洋中富含甲烷的成分。泰坦假设的热带气旋最有可能出现的季节是在北半球夏至前后,此时海面变暖,近地面空气的相对涡度因季节性辐合和赤道波活动而增加。热带气旋将表现为一个逆时针旋转的漩涡,正好在北部海域之一(Kraken Mare, ligea Mare, Punga Mare)上,并将海面上的风增加一个数量级。另一方面,由于可忽略的科里奥利参数和较大的垂直风切变等动力学原因,热带气旋不太可能出现在土卫六的少数热带湖泊上。
While extratropical cyclones cannot be expected in Titan’s barotropic troposphere, tropical cyclones which gain their energy from the latent heat of sea evaporation cannot be entirely dismissed over Titan’s polar hydrocarbon seas. The most essential condition for the genesis of tropical cyclones on Titan is a methane-rich composition of the polar seas. The most likely season for Titan’s hypothetical tropical cyclones is around the northern summer solstice when the sea surface gets warmer and the relative vorticity of the near-surface air increases by seasonal convergence and equatorial wave activity. A tropical cyclone would manifest itself as an anti-clockwise swirling vortex right over one of the northern seas (Kraken Mare, Ligeia Mare, Punga Mare) and increase the surface wind over the seas by an order of magnitude. On the other hand, tropical cyclones are unlikely to emerge over Titan’s few tropical lakes for dynamic reasons such as negligible Coriolis parameter and large vertical wind shear.
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