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National Transportation Planningve instability. When they are strictly isolated, they can be satisfactorily described by the linear theory because of the (almost) incompressibility of the atmosphere. In general, however, several waves coexist, and the nonlinear interactions can significantly influence their propagation far below t

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aerial

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Introduction: The Myth of Protection,sed using a very accurate dataset (185mxl85m) of the Alps. The linear approach shows that for horizontal scales varying between few Kms and 100Km mountains excite gravity waves which transport significant angular momentum. Nevertheless, this linear view is not sufficient for real mountains, and upst

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Some Problems Relating to the Observed Characteristics of Gravity Waves in the Middle Atmosphere, comments on the basic idea of the gravity wave dynamics and the capability of observational techniques, results of rocketsonde, balloonsonde and MU radar data analyses are briefly recalled. It is stressed that the “climatology of gravity wave sources” is still open to question, even though we have

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Measurements of Intermittency in the Upper Stratosphere and Mesosphere,ere, which are easier to probe via in situ and remote sensing techniques. This paucity of measurements impacts the parameterization of gravity waves in general circulation models of the middle atmosphere, since the effects of gravity waves are not adequately constrained by measurements. The developm

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