Gravity waves (GWs) generated by convection in the tropics and summer subtropics play a key role in vertically transporting energy and momentum. These waves contribute significantly to the dynamics of the atmosphere by depositing momentum while they break or dissipate. However, spatial and temporal scales of the convective forcing are not well known. We first addressed this open issue by performing a systematic verification of free parameters of the Yonsei convective GW source (CGWS) scheme based on observations from the High Resolution Dynamics Limb Sounder (HIRDLS). Waves generated by the CGWS scheme are propagated upwards using ray tracing method. To simulate the observational constraints, a comprehensive observational filter for limb sounding technique was applied. By this approach, long-scale convective GWs can be investigated. Combinations of four scale sets, which reproduce the observed GW momentum flux (GWMF) spectrum were selected for northern as well as southern summer. Results show that selected scale sets can successfully reproduce the momentum balance in vertical cross sections of GWMF and GWD. Global maps of the horizontal distribution of GWMF are consistent with those observed. The latitude dependence of the zonal phase speed spectrum of GWMF and its change with altitude are presented. Also presented is the distribution of GWMF depending on phase speed and azimuthal propagation direction. In addition, the interaction of CGWs with the QBO and SAO in the tropics is discussed.

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*email: t.trinh@fz-juelich.de
*Preference: Oral