Tropical cyclogenesis: a numerical diagnosis based on helical flow organization
Levina, G. V.
Montgomery, M. T.
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A numerical diagnosis for tropical cyclogenesis is proposed based on near-cloud-resolving atmosphere simulation. Calculation and analyses of helical and energetic characteristics together with hydro- and thermodynamic flow fields aloe the diagnosis of tropical cyclogenesis as an event when the primary and secondary circulations become linked on systems scales thereby making the nascent large-scale vortex helical. A key process of vertical vorticity generation from horizontal components and its amplification by special convective coherent structures - Vortex Hot Towers (VHTs) - is highlighted. The process is found to be a pathway for generation of a velocity field with linked vortex lines of horizontal and vertical vorticity on local and systems scales. the role of VHTs as connectors of the primary and secondary circulation is emphasized.
The article of record as published may be found at http://doi:10.1088/1742-6596/544/1/012013
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