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| Titel |
Retrieval of atmospheric static stability from MST radar return signal power |
| VerfasserIn |
D. A. Hooper, J. Arvelius, K. Stebel |
| 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. 11 ; Nr. 22, no. 11 (2004-11-29), S.3781-3788 |
| Datensatznummer |
250015048
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| Publikation (Nr.) |
 copernicus.org/angeo-22-3781-2004.pdf |
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| Zusammenfassung |
| An empirical technique for retrieving profiles of the square of the
Brunt-Väisälä frequency, ωB2, from MST radar return
signal power is presented. The validity of the technique, which is
applied over the altitude range 1.0-15.7km, is limited to those
altitudes at which the humidity contributions to the mean vertical
gradient of generalised potential refractive index, M, can be
ignored. Although this is commonly assumed to be the case above the
first few kilometres of the atmosphere, it is shown that humidity
contributions can be significant right up to the tropopause
level. In specific circumstances, however, the technique is valid over
large sections of the troposphere. Comparisons of radar- and
(balloon-borne) radiosonde-derived ωB2 profiles are
typically quantitatively and qualitatively well matched. However, the
horizontal separation between the radar and the radiosondes (which
were launched at the radar site) increases with increasing
altitude. Under conditions of mountain wave activity, which can be
highly localised, large discrepancies can occur at lower-stratospheric
altitudes. This demonstrates the fact that radiosonde observations
cannot necessarily be assumed to be representative of the atmosphere
above the launch site. |
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