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| Titel |
Middle-atmospheric zonal and meridional wind profiles from polar, tropical and midlatitudes with the ground-based microwave Doppler wind radiometer WIRA |
| VerfasserIn |
R. Rüfenacht, A. Murk, N. Kämpfer, P. Eriksson, S. A. Buehler |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 12 ; Nr. 7, no. 12 (2014-12-18), S.4491-4505 |
| Datensatznummer |
250115998
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| Publikation (Nr.) |
 copernicus.org/amt-7-4491-2014.pdf |
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| Zusammenfassung |
WIRA is a ground-based microwave Doppler spectroradiometer specifically
designed for the measurement of profiles of horizontal wind in the upper
stratosphere and lower mesosphere region where no other continuously running
measurement technique exists. A proof of principle has been delivered in
a previous publication. A technical upgrade including a new high-frequency
amplifier and sideband filter has improved the signal to noise ratio by
a factor of 2.4. Since this upgrade the full horizontal wind field comprising
zonal and meridional wind profiles is continuously measured. A completely new
retrieval based on optimal estimation has been set up. Its characteristics
are detailed in the present paper.
Since the start of the routine operation of the first prototype in
September 2010, WIRA has been measuring at four different locations at polar,
mid- and tropical latitudes (67°22' N/26°38' E,
46°57' N/7°26' E,
43°56' N/5°43' E and
21°04' S/55°23' E) for time periods between 5.5 and
11 months. The data presented in this paper are daily average wind profiles
with typical uncertainties and resolutions of 10 to 20 m s−1 and
10 to 16 km, respectively. A comparison between the data series from
WIRA and European Centre for Medium-Range Weather Forecasts (ECMWF) model data revealed agreement within 10% in the
stratospheric zonal wind. The meridional wind profiles agree within their
error bars over the entire sensitive altitude range of WIRA. However,
significant differences in the mesospheric zonal wind speed of up to
50% have been found. |
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