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| Titel |
Complementary wind sensing techniques: sodar and RASS |
| VerfasserIn |
G. Peters, H. J. Kirtzel |
| 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 ; 12, no. 6 ; Nr. 12, no. 6, S.506-517 |
| Datensatznummer |
250010908
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| Publikation (Nr.) |
 copernicus.org/angeo-12-506-1994.pdf |
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| Zusammenfassung |
| Radioacoustic sounding (RASS), normally used
for temperature profiling, can also be applied for wind measurements. The RASS
detects echoes of radar waves, which have been scattered at acoustic waves, and
derives the sound velocity from the frequency shift. From the difference of
sound velocities measured under different beam directions windprofiles can be
determined. Ground clutter does not principally interfere with RASS echoes due
to their big frequency shift. Therefore, RASS can supplement radar wind
profilers at lower levels where clear-air echoes may be not detectable due to
ground clutter. The upper measuring altitude of RASS is limited to a few
thousand radar wavelengths by the sound absorption and by the drift of the focal
spot of the RASS echo. A further alternative for low-level wind measurements is
the Doppler sodar. It is less sensitive to ground clutter than radar, but the
measuring height is also limited by sound absorption. It requires no frequency
allocation and may therefore be the only choice at some locations. In Germany,
Doppler sodars have been operating successfully on a routine basis for more than
10 years at several sites for environmental monitoring purposes. |
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