Numerical simulation of tides, Rossby and Kelvin waves with the COMMA-LIM model

Quasi two-day-wave modulation of gravity wave flux and consequences for the planetary wave propagation in a simple circulation model

“…Modulation of GW flux through the QTDW has been proved by Manson et al (2003) using a medium frequency radar network. On the other hand, numerical model results by Fro¨hlich et al (2003) revealed wind amplitudes at summer midlatitudes that are smaller than known from measurements, and a change of QTDW amplitudes when the GW amplitudes used to force the GW parameterisation are modified, indicating interaction of GW and QTDW in the model.…”

“…However, simple circulation models not always produce a QTDW self-consistently, so that the wave structure has to be included in the model as an additional forcing (e.g. Palo et al, 1999;Fro¨hlich et al, 2003), usually near the lower boundary of the model. This means the QTDW is treated as a wave propagating from below, and is therefore subject to possible interaction with gravity waves (GW) during its vertical passage to the mesosphere.…”

Planetary waves in coupling the lower and upper atmosphere

“…It is based on the Cologne Model of the Middle Atmosphere-Leipzig Institute for Meteorology (COMMA-LIM; Fro¨hlich et al, 2003;Jacobi et al, 2006). The MUAM is a grid-point model with horizontal (latitude/longitude) resolution of 5 Â 5:625 .…”

Gravity wave climatology and trends in the mesosphere/lower thermosphere region deduced from low-frequency drift measurements 1984–2003 (52.1°N, 13.2°E)

“…A detailed radiation routine is included in the model that allows the simulation of the solar cycle UV radiation flux through including changes between 2% in the Hartley band and 20% in the extreme UV band (based on Rottman, 1999) into the absorption routine. Results for the mean flow, temperature, and planetary waves are presented in Fro¨hlich et al (2003). In Fig.…”