20.500.12556/RUL-156065 Decomposition of the horizontal wind divergence associated with the Rossby, mixed Rossby-gravity, inertia-gravity, and Kelvin waves on the sphere The paper presents a new method for the decomposition of the horizontal wind divergence among linear waves on the sphere: inertia-gravity (IG), mixed Rossby-gravity (MRG), Kelvin and Rossby waves. The work is motivated by the need to quantify the vertical velocity and momentum fluxes in the tropics where the distinction between the Rossby and gravity regime, present in the extratropics, becomes obliterated. The method leads to divergence power spectra as a function of latitude and pressure. The spectra follow the same power laws as the vertical kinetic energy spectra for different wave types. The key novel aspect of the work is the coexistence of wave types at the same zonal wavenumbers. Applied to ERA5 data in August 2018, the new method reveals that the zonally-integrated Kelvin wave divergence makes up about 19% of the upper-troposphere divergence within 10°S–10°N. The MRG wave divergence has four times smaller magnitude. The relative roles of the two waves vary with scale. Overall small roles of the Kelvin and MRG waves in the tropical divergence is explained by decomposing their kinetic energies into rotational and divergent parts. The beta effects produces less then 5% of the tropospheric divergence associated with Rossby waves. The majority of divergence belongs to IG modes and is nearly equipartitioned between the eastward- and westward-propagating IG modes in the upper troposphere, whereas stratospheric partitioning depends on the background flow. meteorology meteorologija true false true Angleški jezik Slovenski jezik Članek v reviji 2024-05-07 09:53:12 2024-05-07 09:53:12 2024-05-08 04:01:30 0000-00-00 00:00:00 2024 0 0 20 str. iss. 9, art. no. e2023JD040427 Vol. 129 May 2024 0000-00-00 Zaloznikova NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2024-04-29 551.5 2169-897X 10.1029/2023JD040427 194571779 JGR_Atmospheres_-_2024_-_Neduhal_-_Decomposition_of_the_Horizontal_Wind_Divergence_Associated_With_the_Rossby__Mixed.pdf JGR_Atmospheres_-_2024_-_Neduhal_-_Decomposition_of_the_Horizontal_Wind_Divergence_Associated_With_the_Rossby__Mixed.pdf 1 67F6F2DBEC22490309C9E7519F1B2A06 789c58e61bc2ff7cc3ca9b19751d668082c6f298bf28e1f295c7faaa29b060b9 5bc03e82-0c47-11ef-a791-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183286 https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JD040427 0 65970a6b-0c47-11ef-a791-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183287 Fakulteta za matematiko in fiziko 0 0 0