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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 4, pp. 213-222

Cloud-resolving numerical analysis of the process of helicity generation in conditions of tropical cyclogenesis

G.V. Levina 1 , N.N. Zolnikova 1 , L.A. Mikhailovskaya 1 
1 Space Research Institute RAS, Moscow, Россия
Accepted: 21.06.2017
DOI: 10.21046/2070-7401-2017-14-4-213-222
A numerical analysis of the process of helicity generation in the tropical atmosphere of the Earth was carried out. The study was performed based on post-processing of the American data of cloud-resolving numerical simulation of tropical cyclones obtained by using the model RAMS — Regional Atmospheric Modeling System (Montgomery et al., 2006). A mechanism is discussed that generates the vertical vorticity and helicity in the tropical atmosphere due to the interaction of cloud convection with vertical shear of horizontal velocity. In connection with the fact that in all known examples of large-scale instabilities found in helical turbulent media there existed excitation thresholds depended on helicity magnitude, in this work, close attention is paid to the influence of the initial conditions on helicity generation during the first hours of the experiments. Helical flow characteristics were calculated and compared for two numerical experiments, in one of which an initial weak large-scale vortex disturbance was specified in the middle troposphere while in the other, the initial vortex was absent. The discussion is offered for the influence on helicity generation of a local heating at low levels of the troposphere, which was applied during the initial 300 seconds of experiments in order to accelerate development of cloud convection. Considered a process of generation by the local heating of a single intense helical cloud structure — the vortical hot tower (VHT), that reached its maximal intensity within the first 1-2 hours. Quantitative analysis of helicity generation by the single VHT was carried out for two different scenarios.
Keywords: tropical cyclogenesis, moist convective atmospheric turbulence, shear flow, helicity generation, cloud-resolving numerical analysis
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References:

  1. Levina G.V., Montgomeri M.T., O pervom issledovanii spiral’noi prirody tropicheskogo tsiklogeneza (The first examination of the helical nature of tropical cyclogenesis), Doklady AN, 2010, Vol. 434, No. 3, pp. 401–406.
  2. Moiseev S.S., Sagdeev R.Z., Tur A.V., Khomenko G.A., Yanovskii V.V., Teoriya vozniknoveniya krupnomasshtabnykh struktur v gidrodinamicheskoi turbulentnosti (Theory of the origin of large-scale structures in hydrodynamic turbulence), ZhETF, 1983, Vol. 85, No. 6(12), pp. 1979–1987.
  3. Moiseev S.S., Sagdeev R.Z., Tur A.V., Khomenko G.A., Shukurov A.M., Fizicheskii mekhanizm usileniya vikhrevykh vozmushchenii v atmosfere (Physical mechanism of amplification of vortex disturbances in the atmosphere), Doklady AN SSSR, 1983, Vol. 273, No. 3, pp. 549–553.
  4. Moiseev S.S., Rutkevich P.B., Tur A.V., Yanovskii V.V., Vikhrevoe dinamo v konvektivnoi srede so spiral’noi turbulentnost’yu (Vortex dynamo in a convective medium with helical turbulence), ZhETF, 1988, Vol. 94, No. 2, pp. 144–153.
  5. Moffatt H.K., Vozbuzhdenie magnitnogo polya v provodyashchei srede (Magnetic Field Generation in Electrically Conducting Fluids), Moscow: Mir, 1980, 340 p.
  6. Riehl H., Klimat i pogoda v tropikakh (Climat and Weather in the Tropics), Leningrad: Gidrometeoizdat, 1984, 605 p.
  7. Rutkevich P.B., Uravnenie vikhrevoi neustoichivosti, vyzvannoi konvektivnoi turbulentnost’yu i siloi Koriolisa (Equation for vortex instability caused by convective turbulence and the Coriolis force), ZhETF, 1993, Vol. 104, No. 6(12), pp. 4010–4020.
  8. Frisch U., Turbulentnost’. Nasledie A.N. Kolmogorova (Turbulence: the Legacy of A.N. Kolmogorov), Moscow: Fazis, 1998, 346 p.
  9. Davis C.A., Bosart L.F., Numerical simulation of the genesis of Hurricane Diana (1984). Part II: Sensitivity of track and intensity prediction, Mon. Wea. Rev., 2002, Vol. 130, pp. 1100–1124.
  10. Hendricks E.A., Montgomery M.T., Davis C.A., The role of “vortical” hot towers in the formation of tropical cyclone Diana (1984), J. Atmos. Sci., 2004, Vol. 61, pp. 1209–1232.
  11. Hide R., A note on helicity, Geophys. (& Astrophysical — after 1977) Fluid Dyn., 1976, Vol. 7, pp. 157–161.
  12. Kilroy G., Smith R.K., Montgomery M.T., A unified view of tropical cyclogenesis and intensification, Quarterly Journal of the Royal Meteorological Society, 2016. DOI: 10.1002/qj.2934.
  13. Levina G.V., Helical organization of tropical cyclones, Preprint NI13001-TOD. Cambridge, UK: Isaac Newton Institute for Mathematical Sciences, 2013. 47 p.
  14. Levina G.V., Montgomery M.T., Helical scenario of tropical cyclone genesis and intensification, J. Phys.: Conf. Series, 2011, Vol. 318(7), 072012.
  15. Moffatt H.-K., Helicity and singular structures in fluid dynamics, Proceedings of the National Academy of Sciences USA, 2014, Vol. 111(10), pp. 3663–3670.
  16. Molinari J., Vollaro D., Extreme helicity and intense convective towers in Hurricane Bonnie, Mon. Weather. Rev., 2008, Vol. 136, pp. 4355–4372.
  17. Montgomery M.T., Nicholls M.E., Cram T.A., Saunders A.B., A vortical hot tower route to tropical cyclogenesis, J. Atmos. Sci., 2006, Vol. 63, pp. 355–386.
  18. Reasor P.D., Montgomery M.T., Bosart L.F., Mesoscale observations of the genesis of Hurricane Dolly (1996), J. Atmos. Sci, 2005, Vol. 62, pp. 3151–3171.
  19. Tur A., Chabane M., Yanovsky V., New large scale instability in rotating stratified fluids driven by small scale forces, Open Journal of Fluid Dynamics, 2013, Vol. 3, pp. 340–351.