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| Titel |
Global climatological variability of quasi-two-day waves revealed by TIMED/SABER observations |
| VerfasserIn |
Y. Y. Huang, S. D. Zhang, F. Yi, C. M. Huang, K. M. Huang, Q. Gan, Y. Gong |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 6 ; Nr. 31, no. 6 (2013-06-14), S.1061-1075 |
| Datensatznummer |
250019052
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1061-2013.pdf |
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| Zusammenfassung |
| This paper presents characteristics of quasi-two-day
waves (QTDWs) in the mesosphere and lower thermosphere (MLT) between
52° S and 52° N from 2002 to 2011 using TIMED/SABER
temperature data. Spectral analysis suggests that dominant QTDW components
at mid-high latitudes of the Southern Hemisphere (SH) and the Northern
Hemisphere (NH) are (2.13, W3) and (2.04, W4), respectively. The most
remarkable QTDW is (2.13, W3), which happened in the southern summer of 2002–2003
at 32° S from 60 to 90 km in altitude. Its downward phase
propagation indicates upward propagation of the wave energy and a potential
source region below 60 km. Analysis of horizontal wind fields in the same
period shows the westward and southward propagation of (2.13, W3) and a
possible reflection region above 90 km. Fundamental parameters of QTDWs
present significant interhemispheric differences and interannual
variations in statistical analysis. Amplitudes in the SH are twice larger
than that in the NH, and vertical wavelengths are a little longer in the SH.
QTDWs may endure stronger dissipation in southern summer because of shorter
durations of their attenuation stages. Impact of the equatorial
quasi-biennial-oscillation (QBO) on QTDWs can extend to mid-high latitudes
of both hemispheres. It seems easier for QTDWs to propagate upward in the
equatorial QBO's westerly phase in the lower stratosphere and easterly phase
in the middle stratosphere. Interannual variations of QTDW strength may be
influenced by solar activity as well. Strengths of QTDWs appear to be
stronger (weaker) in the solar maximum (minimum). |
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