Abstract
The appearance of inertia-gravity waves over Northern Germany between the 17 and the 19 December 1999 is investigated. During this period a diffluent region downstream of the jet and north-eastwards of an anticyclone occurs in connection with the second phase of a poleward Rossby wave breaking event over the North Atlantic European region. A series of 3-hourly radiosonde ascents and a permanent measuring VHF-radar are used to examine the properties of inertia-gravity waves. The diagnostic results based on a linear theory show a characteristic horizontal wavelength of about 890 km and a vertical wavelength of about 2-3 km in the stratosphere and about 3.3 km in the troposphere. The inertia-gravity waves were amplified downstream of the jet. The phase propagation was upstream with an oscillation period of about 12.5 hr, but the energy propagation was upward in the stratosphere and downward in the troposphere with an energy source in the tropopause region. The inertia-gravity waves propagated through the middle stratosphere because strong zonal winds occurred over the whole altitude region due to the location on the edge of the polar vortex.
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