By transformation of the equation of dynamic meteorology, we can assume that ζ+λ+∂θ/∂
t is an important factor in treating dynamical phenomena of the atmosphere, where ζ is the relative vorticity, λ is Coriolis' parameter and ∂θ/∂
t is the local variation of the wind direction θ. This term was called the absolute vorticity of the second by the author.
Some examples of the above unstationary effect were discussed. Firstly, the gradient wind in case of stationary motion is described as fallows: where,
P is the total pressure, so that for an unstationary case, the following expressions are assumed tohold: and the result was derived by solving the equation.
Secondly, as the criterion of dynamical stability is given by the sign of absolute vorticity, assumption can be made that in an unstationary case, the criterion is given by the sign of the absolute vorticty of the second kind ζ+λ+∂θ/∂
t, and this result was applied to a simple case in which the parcel method is used, revealing itself to be correct.
Fufther, some other phenomena were also discussed.
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