Wind and turbulence measurements by the Middle and Upper Atmosphere Radar (MUR): comparison of techniques
The structure-function-based method (referred to as UCAR-STARS), a technique for estimating mean horizontal winds, variances of three turbulent velocity components and horizontal momentum flux was applied to the Middle and Upper atmosphere Radar (MUR) operating in spaced antenna (SA) profiling m...
| Những tác giả chính: | , , , , |
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| Định dạng: | Bài viết |
| Ngôn ngữ: | English |
| Được phát hành: |
Copernicus Publications
2004-11-01
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| Loạt: | Annales Geophysicae |
| Truy cập trực tuyến: | https://www.ann-geophys.net/22/3843/2004/angeo-22-3843-2004.pdf |
| Tóm tắt: | The structure-function-based method (referred to as UCAR-STARS), a
technique for estimating mean horizontal winds, variances of three
turbulent velocity components and horizontal momentum flux was applied
to the Middle and Upper atmosphere Radar (MUR) operating in spaced
antenna (SA) profiling mode. The method is discussed and compared with
the Holloway and Doviak (HAD) correlation-function-based technique.
Mean horizontal winds are estimated with the STARS and HAD techniques;
the Doppler Beam Swinging (DBS) method is used as a reference for evaluating
the SA techniques. Reasonable agreement between SA and DBS techniques is
found at heights from 5km to approximately 11km, where signal-to-noise
ratio was rather high.
The STARS and HAD produced variances of vertical
turbulent velocity are found to be in fair agreement. They are affected
by beam-broadening in a different way than the DBS-produced spectral
width, and to a much lesser degree.
Variances of horizontal turbulent velocity components and horizontal
momentum flux are estimated with the STARS method, and strong anisotropy
of turbulence is found. These characteristics cannot be estimated with
correlation-function-based SA methods, which could make UCAR-STARS
a useful alternative to traditional SA techniques. |
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| số ISSN: | 0992-7689 1432-0576 |