## Publication Abstracts

### Yao 1980

**37**, 29-43, doi:10.1175/1520-0469(1980)037<0029:MOQSWI>2.0.CO;2.

The maintenance of the quasi-stationary waves obtained through numerically integrating a two-level quasi-geostrophic spectral model on a β-plane is studied. An idealized topography which has only wave-number n in the zonal direction and the first mode in the meridional direction is used to force the quasi-stationary waves. However, the model's motion contains wavenumbers 0, n and 2n in the zonal direction, while the first three modes in the meridional direction are allowed for each wave. The cases n=2 and n=3 are considered.

The mechanism for maintaining the quasi-stationary waves is investigated by varying the imposed thermal equilibrium temperature gradient, ΔT_{e}, and the reciprocal of the internal frictional coefficient, 0.5 /k_{I}. If the flow is not highly irregular, the available potential energy of quasi-stationary waves (A_{s}) is maintained by the energy conversion A_{z}→A_{s}, where A_{z} is the available potential energy of the time-averaged zonal mean flow. For n=3 and moderately large ΔTe and /k_{I}, the kinetic energy of these waves (K_{s}) is maintained by the energy conversion A_{s}→K_{s}. If ΔTe, or /k_{I} is smaller while n=3, kinetic energy is supplied to the quasi-stationary waves by the energy conversion K_{z}→K_{s} through the topographic forcing, where K_{z} is the kinetic energy of the time-averaged zonal mean flow. The latter mechanism also maintains the kinetic energy of the quasi-stationary waves for n=2 with relatively small ΔTe and /k_{I} is sufficiently large, the flow is highly irregular and a unique regime cannot be defined for either n=2 or n=3.

In the case of n=3 and moderately large ΔTe and /k_{I}, the energy cycle, spectra and form of the quasi-stationary waves suggest that the quasi-stationary waves are largely baroclinic waves which draw their energy from the forced waves.

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#### BibTeX Citation

@article{ya09000a, author={Yao, M.-S.}, title={Maintenance of quasi-stationary waves in a two-level quasi-geostrophic spectral model with topography}, year={1980}, journal={J. Atmos. Sci.}, volume={37}, pages={29--43}, doi={10.1175/1520-0469(1980)037%3C0029%3AMOQSWI%3E2.0.CO;2}, }

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#### RIS Citation

TY - JOUR ID - ya09000a AU - Yao, M.-S. PY - 1980 TI - Maintenance of quasi-stationary waves in a two-level quasi-geostrophic spectral model with topography JA - J. Atmos. Sci. VL - 37 SP - 29 EP - 43 DO - 10.1175/1520-0469(1980)037%3C0029%3AMOQSWI%3E2.0.CO;2 ER -

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