Search Results

You are looking at 1 - 5 of 5 items for :

  • Diabatic heating x
  • Multi-Scale Dynamics of Gravity Waves (MS-GWaves) x
  • All content x
Clear All
Mozhgan Amiramjadi, Ali R. Mohebalhojeh, Mohammad Mirzaei, Christoph Zülicke, and Riwal Plougonven

the fast and slow modes as carried out for Eq. (2.12) , that is, (2.15) Q th conv = 1 2 π θ 0 g [ β N 5 ⁡ ( L z conv ) 3 ] 1 / 2 ⋅ Alternatively, using the counterpart of (2.4) for the Froude number asymptotics of the equatorial regions, one can see from u > NL z /(2 π ) that F min = 1/(2 π ) is the minimum value of the Froude number for the activation of convective sources. Using (2.14) , in turn this sets a minimum or threshold for diabatic heating, that is, (2.16) Q th conv = Fr min θ

Restricted access
Mahnoosh Haghighatnasab, Mohammad Mirzaei, Ali R. Mohebalhojeh, Christoph Zülicke, and Riwal Plougonven

incorporating the gravity waves generated by convection. In this way, they carried out a dry idealized simulation using the Weather Research and Forecasting (WRF) Model forced by diabatic heating field obtained by converting radar precipitation rates, and succeeded to reproduce the observed gravity waves associated with squall lines and mesoscale convective systems. In the energy-based parameterization of IGWs generated by nonorographic sources, including convection, proposed by Mirzaei et al. (2014) , a

Free access
Junhong Wei, Gergely Bölöni, and Ulrich Achatz

different scales are of interest, or also ageostrophic flow such as the residual circulation. A central goal of the present work is a comparison of the two approaches in validations against wave-resolving simulations, and it will be shown that the direct approach is considerably more reliable. In a first comparison between the pseudomomentum and the direct approach, one can easily point out that the pseudomomentum approach does not include any elastic or heating effect by IGWs while, mathematically

Full access
Mohammad Mirzaei, Ali R. Mohebalhojeh, Christoph Zülicke, and Riwal Plougonven

vorticity inversion WVD, no thermodynamic information is directly available from the actual flow. The approximation of the thermodynamic state in the WVD may result in significant error in the distribution of localized centers of diabatic heating. The adverse effects of such errors on the resulting balanced flow is thought to be responsible for the failure of compressibility in related energy estimates. The extent to which a potential-vorticity-based WVD may overcome this issue remains to be studied in

Full access
Jannik Wilhelm, T. R. Akylas, Gergely Bölöni, Junhong Wei, Bruno Ribstein, Rupert Klein, and Ulrich Achatz

different color range compared to Fig. 4 . 5. Résumé, discussion, and outlook The first question in our study was whether there are any submesoscale GWs that can modify mesoscale dynamics at typical scales. This has been investigated within Boussinesq dynamics for typical midlatitude tropospheric values of f / N , using scale analysis comparing the magnitude of large-amplitude submesoscale GW flux convergences with the self-consistent acceleration and heating in statically stable mesoscale GWs. A

Full access