On Taking into Consideration the High-Level Atmosphere for the Purpose of Simulation of Orographic Disturbances in the Troposphere
The study considers the problem of upper boundary conditions with regard to simulation of the phenomenon of the airflow over the mountains. A two-dimensional stationary non-linear analytical model is used. In a three-layer upstream flow, the velocity does not depend on the height, and the vertical temperature gradients change from layer to layer. The lower layer is the troposphere, the middle layer – the lower stratosphere, and the upper layer – the whole upper atmosphere unlimited in height. The impact of changes in the middle layer stability on the wave energy reflection from the upper layers and, finally, on tropospheric disturbances is examined. It is confirmed that the energy reflection especially grows when the middle layer temperature gradient approaches the dry-adiabatic value, as, in such case, the environment resilience to air particles vertical displacements disappears. It is shown that, even in such case, energy reflection is not full, and, consequently, the Long resonance is not possible in the atmosphere.