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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 General Circulation Changes Seen in the Mesosphere Offermann Dirk 1 , Hoffmann Peter 2 , Knieling Peter 3 , Koppmann Ralf 4 , Oberheide Jens 5 , Steinbrecht Wolfgang 6 1 Physics Dept. Univ.Wuppertal, 2 Inst.Atm.Phys., Kühlungsborn, 3 Physics Dept. Univ. Wuppertal, 4 Physics Dept.Univ.Wuppertal, 5 Dept.Phys.Astron, Clemson Univ., 6 Met.Obs.Hohenpeißenberg, DWD Temperature measurements at two OH stations (Wuppertal, 51°N, 7°E; Hohenpeißenberg, 48°N, 11°E) cover almost two solar cycles (#22, #23) and are analyzed for long-term trends and solar influences on an annual basis. The seasonal variations of OH temperatures ( high values during winter, low values during summer) are counter-intuitive and are closely linked to the atmospheric circulation. The width of the “summer-valley” is monitored for long-term changes by means of the “Equivalent Summer Duration” (ESD) which is defined as the time span with temperatures lower than 198 K. A long-term increase of ESD is found with a rate of about one day per year. Temperature trends have also been analyzed on a monthly basis. They are quite different in different parts of the year which explains the ESD trend. Summer duration in the stratosphere has been determined from zonal wind turn-around in spring and autumn. A long-term change is observed here, too. Its sign is, however, opposite to that in the mesosphere, i.e. summer duration becomes shorter. These summer length changes are interpreted as long-term changes of middle atmosphere general circulation. They appear to be linked to changes of the Eliassen-Palm flux from the troposphere to the lower stratosphere. Recent analyses of Quasi Two-Day Waves (QTDW) in the summer mesosphere have found a triple maximum of amplitudes. This triplet has changed its form during the last 21 years. Thus the dynamical stability of the mesosphere has changed. This is supported by corresponding changes of the baroclinic instability that has been derived from wind measurements at Juliusruh (54°N, 13°E). In summary there are quite a number of different parameters measured by different methods and at different altitudes that consistently support the idea of a circulation change in the mesosphere.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 The 3-4-Day wave effects on the Brazilian equatorial ionospheric region. Observation and modeling. Onohara Amelia 1 , Takahashi Hisao 1 , Batista Inez 1 , Batista Paulo 1 , Clemesha Barclay 1 , Lima Lourivaldo 2 1 INPE - Instituto Nacional de Pesquisas Espaciais, 2 UEPB - Universidade Estadual da Paraiba We investigate effects of planetary scale waves on the ionospheric parameters, h´F and foF2, in the equatorial ionosphere. In order to find out planetary wave oscillations in the mesopause region, temporal variations of the mesospheric wind structure measured by meteor radar at São João do Cariri (7.4 o S, 36.5 o W) were used. For the ionospheric parameters ionosonde data at Fortaleza (3.9 o S, 38.4 o W) were used. The wavelet analysis was used to identify the 3- 4-Day Kelvin wave oscillations in the observational data, and some coincidence between the parameters was analyzed. The effect of winds induced by the planetary waves in the ionospheric parameters was tested using the ionospheric model “CODB2005” (Codigo de Batista 2005). Some relevant results in comparison of the model calculation and observed oscillation amplitude will be presented.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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