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| Titel |
Calculating the azimuth of mountain waves, using the effect of tilted fine-scale stable layers on VHF radar echoes |
| VerfasserIn |
R. M. Worthington |
| 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 ; 17, no. 2 ; Nr. 17, no. 2, S.257-272 |
| Datensatznummer |
250013677
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| Publikation (Nr.) |
 copernicus.org/angeo-17-257-1999.pdf |
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| Zusammenfassung |
A simple method is described, based on
standard VHF wind-profiler data, where imbalances of echo power between four
off-vertical radar beams, caused by mountain waves, can be used to calculate the
orientation of the wave pattern. It is shown that the mountain wave azimuth
(direction of the horizontal component of the wavevector), is given by the
vector [ W (PE
- P W ) ,W
(PN - P S ) ]; PN,
PS, PE, PW
are radar echo powers, measured in dB, in beams pointed away from vertical by
the same angle towards north, south, east and west respectively, and W
is the vertical wind velocity. The method is applied to Aberystwyth MST radar
data, and the calculated wave vector usually, but not always, points into the
low-level wind direction. The mean vertical wind at Aberystwyth, which may also
be affected by tilted aspect-sensitive layers, is investigated briefly using the
entire radar output 1990-1997. The mean vertical-wind profile is inconsistent
with existing theories, but a new mountain-wave interpretation is proposed.
Key words. Meteorology and atmospheric dynamics (middle
atmosphere dynamics; waves and tides; instruments and techniques). |
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