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| Titel |
Monthly mean climatology of the prevailing winds and tides in the Arctic mesosphere/lower thermosphere |
| VerfasserIn |
Y. I. Portnyagin, T. V. Solovjova, N. A. Makarov, E. G. Merzlyakov, A. H. Manson, C. E. Meek, W. Hocking, N. Mitchell, D. Pancheva, P. Hoffmann, W. Singer, Y. Murayama, K. Igarashi, J. M. Forbes, S. Palo, C. Hall, S. Nozawa |
| 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 ; 22, no. 10 ; Nr. 22, no. 10 (2004-11-03), S.3395-3410 |
| Datensatznummer |
250015019
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| Publikation (Nr.) |
 copernicus.org/angeo-22-3395-2004.pdf |
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| Zusammenfassung |
| The Arctic MLT wind regime parameters measured at the ground-based network
of MF and meteor radar stations (Andenes 69° N, Tromsø 70° N, Esrange 68° N, Dixon
73.5° N, Poker Flat 65° N and Resolute Bay 75° N) are discussed and compared with
those observed in the mid-latitudes. The network of the ground-based MF and
meteor radars for measuring winds in the Arctic upper mesosphere and lower
thermosphere provides an excellent opportunity for study of the main global
dynamical structures in this height region and their dependence from
longitude. Preliminary estimates of the differences between the measured
winds and tides from the different radar types, situated 125-273km apart
(Tromsø, Andenes and Esrange), are provided. Despite some differences
arising from using different types of radars it is possible to study the
dynamical wind structures. It is revealed that most of the observed
dynamical structures are persistent from year to year, thus permitting the
analysis of the Arctic MLT dynamics in a climatological sense. The seasonal
behaviour of the zonally averaged wind parameters is, to some extent,
similar to that observed at the moderate latitudes. However, the strength of
the winds (except the prevailing meridional wind and the diurnal tide
amplitudes) in the Arctic MLT region is, in general, less than that detected
at the moderate latitudes, decreasing toward the pole. There are also
some features in the vertical structure and seasonal variations of the
Arctic MLT winds which are different from the expectations of the
well-known empirical wind models CIRA-86 and HWM-93. The tidal phases show a
very definite longitudinal dependence that permits the determination of the
corresponding zonal wave numbers. It is shown that the migrating tides play
an important role in the dynamics of the Arctic MLT region. However, there
are clear indications with the presence in some months of non-migrating tidal
modes of significant appreciable amplitude. |
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