A theoretical study on the spontaneous radiation of inertia-gravity waves using the renormalization group method. Part II: Verification of the theoretical equations by numerical simulation

Yuki Yasuda, Kaoru Sato, Norihiko Sugimoto

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The renormalization group equations (RGEs) describing spontaneous inertia-gravity wave (GW) radiation from part of a balanced flow through a quasi resonance that were derived in a companion paper by Yasuda et al. are validated through numerical simulations of the vortex dipole using the Japan Meteorological Agency nonhydrostatic model (JMA-NHM). The RGEs are integrated for two vortical flow fields: the first is the initial condition that does not contain GWs used for the JMA-NHM simulations, and the second is the simulated thirtieth-day field by the JMA-NHM. The theoretically obtained GW distributions in both RGE integrations are consistent with the numerical simulations using the JMA-NHM. This result supports the validity of the RGE theory. GW radiation in the dipole is physically interpreted either as the mountain-wave-like mechanism proposed by McIntyre or as the velocity-variation mechanism proposed by Viúdez. The shear of the large-scale flow likely determines which mechanism is dominant. In addition, the distribution of GW momentum fluxes is examined based on the JMA-NHM simulation data. The GWs propagating upward from the jet have negative momentum fluxes, while those propagating downward have positive ones. The magnitude of momentum fluxes is approximately proportional to the sixth power of the Rossby number between 0.15 and 0.4.

Original languageEnglish
Pages (from-to)984-1009
Number of pages26
JournalJournal of the Atmospheric Sciences
Volume72
Issue number3
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Atmospheric
  • Differential equations
  • Filtering techniques
  • Inertia-gravity waves
  • Jets
  • Waves

ASJC Scopus subject areas

  • Atmospheric Science

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