Naslov
Effects of varying the shape of the convective heating profile on convectively coupled gravity waves and moisture modes

Autori
Fuchs, Željka ; Gjorgjievska, Saska ; Raymond, David J.

Izvornik
Journal of the atmospheric sciences (0022-4928) 69 (2012), 8; 2505-2519

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
temperature-gradient approximation; Madden-Julian oscillation; stratiform instability; tropical variability; equatorial waves; Eastern Pacific; deep convection; vertical-mode; water-vapor

Sažetak
The analytical model of convectively coupled gravity waves and moisture modes of Raymond and Fuchs is extended to the case of top-heavy and bottom-heavy convective heating profiles. Top-heavy heating profiles favor gravity waves, while bottom-heavy profiles support moisture modes. The latter behavior results from the sensitivity of moisture modes to the gross moist stability, which is more negative with bottom-heavy heating. A numerical implementation of the analytical model allows calculations in the two-dimensional nonrotating case as well as on a three-dimensional equatorial beta plane. In the two-dimensional case the analytical and numerical models are mostly in agreement, although minor discrepancies occur. In three dimensions the gravity modes become equatorial Kelvin waves whereas the moisture modes are more complex and require further investigation.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA