Impacts of introducing a convective gravity-wave parameterization upon the QBO in the Met Office Unified Model

Y. H. Kim, A. C. Bushell, D. R. Jackson, H. Y. Chun

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A convective gravity-wave parameterization (GWP) is introduced in the Met Office Unified Model (MetUM) in addition to the existing GWPs, and the tropical quasi-biennial oscillation (QBO) is simulated. We replace a significant amount of momentum flux, which is originally launched by the background GWP, with the convective gravity-wave (CGW) momentum flux with a broad wave spectrum that is explicitly determined by the convective sources. Compared to the experiment without the CGW parameterization, including the CGW parameterization results in a greater variability in the duration of each phase of the QBO, which is closer to observed. Including the CGWs also strengthens the annual cycle of zonal wind and it allows for stronger modulation of the semi-annual oscillation. Key Points Introducing a convective GW parameterization increases variations in the QBOIntroducing the parameterization strengthens the annual cycle of tropical windIntroducing the parameterization allows for seasonal modulation of the SAO

Original languageEnglish
Pages (from-to)1873-1877
Number of pages5
JournalGeophysical Research Letters
Volume40
Issue number9
DOIs
Publication statusPublished - 2013 May 16

Fingerprint

quasi-biennial oscillation
gravity waves
parameterization
gravity wave
annual cycle
momentum
semiannual oscillation
modulation
cycles
wave spectrum
zonal wind
oscillations

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

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Impacts of introducing a convective gravity-wave parameterization upon the QBO in the Met Office Unified Model. / Kim, Y. H.; Bushell, A. C.; Jackson, D. R.; Chun, H. Y.

In: Geophysical Research Letters, Vol. 40, No. 9, 16.05.2013, p. 1873-1877.

Research output: Contribution to journalArticle

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