| Full text | |
| Author(s): |
Raphaldini, B.
;
Peixoto, P. S.
;
Teruya, A. S. W.
;
Raupp, C. F. M.
;
Bustamante, M. D.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | Physics of Fluids; v. 34, n. 7, p. 21-pg., 2022-07-01. |
| Abstract | |
The dynamics of the Earth's atmosphere is characterized by a wide spectrum of oscillations, ranging from hourly to interdecadal and beyond. The low-frequency component of the atmospheric variability cannot be understood solely in terms of linear atmospheric waves that have shorter timescales. A newly proposed mechanism, the precession resonance mechanism, is a regime of highly efficient energy transfer in the spectral space in turbulent systems. Here, we investigate the role of the precession resonance, and the alignment of dynamical phases, in the generation of low-frequency oscillations and the redistribution of energy/enstrophy in the spectral space using the barotropic vorticity equation. First, the mechanism and its ability to generate low-frequency oscillations are demonstrated in low-order models consisting of four and five nonlinearly interacting Rossby-Haurwitz waves. The precession resonance onset is also investigated in the full barotropic vorticity equation, and the results are in agreement with the reduced models. Efficiency peaks in the energy/enstrophy transfer also correspond to regimes of strong excitation of low-frequency oscillations. The results suggest that the organization of the dynamical phases plays a key role in the redistribution of energy in the spectral space, as well as the generation of low frequencies in the barotropic vorticity equation. Published under an exclusive license by AIP Publishing. (AU) | |
| FAPESP's process: | 15/50686-1 - Paleo-constraints on monsoon evolution and dynamics |
| Grantee: | Pedro Leite da Silva Dias |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 20/14162-6 - Influence of moist convection on the geostrophic adjustment |
| Grantee: | André Seiji Wakate Teruya |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 16/18445-7 - Numerical methods for the next generation weather and climate models |
| Grantee: | Pedro da Silva Peixoto |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 21/06176-0 - Numerical methods for a new generation of weather and climate models |
| Grantee: | Pedro da Silva Peixoto |
| Support Opportunities: | Research Grants - Research Program on Global Climate Change - Young Investigators - Phase 2 |
| FAPESP's process: | 17/23417-5 - Paleoclimatic variability of South Atlantic Convergence Zone and processes in the Atlantic and Pacific Oceans: Last Glacial, Middle Holocene and Last Millennium |
| Grantee: | Breno Raphaldini Ferreira da Silva |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |