Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Geophysical research letters, 2013-05, Vol.40 (9), p.1873-1877

Ort / Verlag

Washington: Blackwell Publishing Ltd

Erscheinungsjahr

2013

Quelle

Wiley Online Library

Beschreibungen/Notizen

• 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 QBO Introducing the parameterization strengthens the annual cycle of tropical wind Introducing the parameterization allows for seasonal modulation of the SAO