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| Titel |
Analysis of wind data in the low atmosphere from a RASS sodar |
| VerfasserIn |
I. A. Pérez, M. A. García, M. L. Sánchez, B. Torre |
| 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 ; 24, no. 2 ; Nr. 24, no. 2 (2006-03-23), S.415-426 |
| Datensatznummer |
250015483
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| Publikation (Nr.) |
 copernicus.org/angeo-24-415-2006.pdf |
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| Zusammenfassung |
| This paper focuses on the ability of a sodar to describe some
characteristics of the atmospheric vertical structure and presents some
techniques for meteorological data evaluation. The measuring campaign took
place in April 2001 and consisted of 10-min averages covering the lower
atmosphere from 40 to 500 m at 20-m levels. Three methods were considered,
the first of which was a scalar analysis performed using a combination of
wind and temperature median profiles. A noticeable contrast between day and
night was obtained. Flat wind profiles during the day were a consequence of
prevailing convective conditions that determined thermal turbulence. A
stable layer above 260 m capped the unstable layer situated below and
guaranteed the stability of the boundary layer. During the night, the
presence of a low level jet was the most significant feature. The height of
the core was 340 m and the higher vertical winds defined it clearly. The
second method focused on the wind vector. In this analysis, the
anti-cyclonic rotation of hourly averages was considered in the lower levels
where it was observed. After a translation of the origin, an empirical,
robust model with two parts was then proposed for the resulting vector. The
angle was described linearly and the module by a second order model for
cylindrical data. Finally, as a third method, three regression analyses were
investigated: vectorial, taking every wind component separately and scalar.
The two first seemed to be more complete due to their description of
anti-cyclonic wind rotation when height increased. Correlation coefficients
also proved to be more satisfactory. As a consequence, these techniques,
although less frequently used, are more suitable to study wind in the low
atmosphere. |
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