Very long-period oscillations in the atmosphere (0–110 km)
2021
Abstract. Multi-annual oscillations have been observed in measured atmospheric data.
These oscillations are also present in general circulation models. This is
the case even if the model boundary conditions with respect to solar cycle,
sea surface temperature, and trace gas variability are kept constant. The
present analysis contains temperature oscillations with periods from below 5 up to more than 200 years in an altitude range from the Earth's surface to the
lower thermosphere (110 km). The periods are quite robust as they are found
to be the same in different model calculations and in atmospheric
measurements. The oscillations show vertical profiles with special
structures of amplitudes and phases. They form layers of high or low
amplitudes that are a few dozen kilometres wide. Within the layers the data are
correlated. Adjacent layers are anticorrelated. A vertical displacement
mechanism is indicated with displacement heights of a few 100 m.
Vertical profiles of amplitudes and phases of the various oscillation
periods as well as their displacement heights are surprisingly similar. The
oscillations are related to the thermal and dynamical structure of the
middle atmosphere. These results are from latitudes and longitudes in central
Europe.
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