Early and late polar breakup episodes have occurred, due to variations in the stratospheric flow structure and upward spreading of planetary waves from the troposphere.
12.
Scientists are connecting a delay in the Arctic vortex breakup with a reduction of planetary wave activities, few stratospheric sudden warming events, and depletion of ozone.
13.
Examination of the climatology data over the same period of time indicates that these wild planetary wave meanderings are not a normal aspect of our regional climate patterns.
14.
:The location of a volcano strongly influences the geographic distribution of atmospheric heating and the development of planetary waves that affect air circulation ( especially in the northern hemisphere ).
15.
More recent work has shown that most teleconnections from the tropics to the extratropics can be understood to surprising accuracy by the propagation of linear, planetary waves upon a 3-dimensional seasonally-varying basic state.
16.
The second stage is one where quasi-geostrophic adjustment takes place by means of planetary waves; this process can be comparable to the wave field adjusting to the mass field ( due to the wavelengths being larger than the Rossby deformation radius.
17.
When this occurs, the vortex rings become more unstable and prone to shifting by planetary waves . The planetary wave activity in both hemispheres varies year-to-year, producing a corresponding response in the strength and temperature of the polar vortex.
18.
When this occurs, the vortex rings become more unstable and prone to shifting by planetary waves . The planetary wave activity in both hemispheres varies year-to-year, producing a corresponding response in the strength and temperature of the polar vortex.
19.
Thus, the phase and group speeds are equal in magnitude but opposite in direction ( phase speed is westward and group velocity is eastward ); note that is often useful to use potential vorticity as a tracer for these planetary waves, due to its invertibility ( especially in the quasi-geostrophic framework ).
20.
In 2005-2006 he showed that processes based on the nonlinear nature of the atmospheric dynamics could probably address the question What caused the southern hemisphere to exhibit very strong planetary waves in 2002 ? This evidence is based on his new finding that the fluctuations of the total ozone content and temperature exhibit long-range correlations.
