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| Titel |
A new technique for evaluating mesospheric momentum balance utilizing radars and satellite data |
| VerfasserIn |
D. J. Frame, B. N. Lawrence, G. J. Fraser, R. A. Vincent, A. Dudhia |
| 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 ; 18, no. 4 ; Nr. 18, no. 4, S.478-484 |
| Datensatznummer |
250013958
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| Publikation (Nr.) |
 copernicus.org/angeo-18-478-2000.pdf |
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| Zusammenfassung |
A new method for evaluating momentum balance
in the mesosphere using radar and satellite data is presented. This method is
applied to radar wind data from two medium frequency installations (near
Adelaide, Australia and Christchurch, New Zealand) and satellite temperature
data from the Improved Stratospheric and Mesospheric Sounder (ISAMS). Because of
limitations in data availability and vertical extent, the technique can only be
applied to evaluate the momentum balance at 80 km above the radar sites for May
1992. The technique allows the calculation of the residual terms in the momentum
balance which are usually attributed to the effects of breaking gravity waves.
Although the results are inconclusive above Adelaide, this method produces
values of zonal and meridional residual accelerations above Christchurch which
are consistent with expectation. In both locations it is apparent that
geostrophic balance is a poor approximation of reality. (This result is not
dependent on a mismatch between the radar and satellite derived winds, but
rather is inherent in the satellite data alone.) Despite significant caveats
about data quality the technique appears robust and could be of use with data
from future instruments.
Key words: Meteorology and atmospheric dynamics (middle
atmosphere dynamics; waves and tides; instruments and techniques) |
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