First results with the Adelaide VHF radar: spaced antenna studies of tropospheric winds

Vincent, R. A.; May, Peter T.; Hocking, W. K.; Elford, W. G.; Candy, Brett; Briggs, B. H.

doi:10.1016/0021-9169(87)90030-4

Cited by 59 publications

(34 citation statements)

References 26 publications

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“…However, evidence has also been found for systematic dierences between the radar and radiosonde measurements (Kessler et al, 1986;Weber and Wuertz, 1990;Astin and Thomas, 1991), the radarbased values being smaller than those derived from balloons. A discrepancy of similar sense has also been reported by Vincent et al (1987) from a comparison of spaced-antenna measurements of winds and corresponding radiosonde values. However, before this is considered as the same discrepancy as seen in the comparison of radiosonde and radar Doppler-shift measurements, the relationship between the two types of radio-wind measurements needs to be clari®ed with further tests of the type described by van Baelen et al (1990).…”

Section: Introductionsupporting

confidence: 80%

“…However, before this is considered as the same discrepancy as seen in the comparison of radiosonde and radar Doppler-shift measurements, the relationship between the two types of radio-wind measurements needs to be clari®ed with further tests of the type described by van Baelen et al (1990). In fact, Vincent et al (1987) have attributed the discrepancy in their comparison to the fact that the triangle of receiving stations was smaller than the diraction pattern being observed, and underestimates of wind speed could be expected (Golley and Rossiter, 1970).…”

Section: Introductionmentioning

confidence: 99%

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A statistical study of underestimates of wind speeds by VHF radar

1997

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Abstract. Comparisons are made between horizontal wind measurements carried out using a VHF-radar system at Aberystwyth (52.4°N, 4.1°W) and radiosondes launched from Aberporth, some 50 km to the southwest. The radar wind results are derived from Doppler wind measurements at zenith angles of 6°in two orthogonal planes and in the vertical direction. Measurements on a total of 398 days over a 2-year period are considered, but the major part of the study involves a statistical analysis of data collected during 75 radiosonde¯ights selected to minimise the spatial separation of the two sets of measurements. Whereas good agreement is found between the two sets of wind direction, radar-derived wind speeds show underestimates of 4±6% compared with radiosonde values over the height range 4±14 km. Studies of the characteristics of this discrepancy in wind speeds have concentrated on its directional dependence, the eects of the spatial separation of the two sets of measurements, and the in¯uence of any uncertainty in the radar measurements of vertical velocities. The aspect sensitivity of radar echoes has previously been suggested as a cause of underestimates of wind speeds by VHF radar. The present statistical treatment and case-studies show that an appropriate correction can be applied using estimates of the eective radar beam angle derived from a comparison of echo powers at zenith angles of 4.2°a nd 8.5°.

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Section: Introductionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

A statistical study of underestimates of wind speeds by VHF radar

1997

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“…The data presented here were obtained with the Buckland Park 54.1-MHz radar (described by Vincent et al [1987]) operated by the Atmospheric Physics Group of the Department of Physics and Mathematical Physics at the University of Adelaide. The operational parameters of the radar for this work are listed in Table 1. Preliminary results from the pre-t0 phase technique have been reported by Elford et al [1995].…”

Section: A New Technique For Determining Meteor Speedsmentioning

confidence: 99%

A new method for the measurement of meteor speeds: The pre‐t_o phase technique

Cervera¹,

Elford²,

Steel³

1997

Radio Science

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Abstract. In this paper we describe a new technique for measuring the speeds of individual meteors based upon the variation of the phase received in specular reflections from the meteor train prior to the meteoroid reaching .the point of closest approach to the observation site. The technique is characterized by high precision, high yield, and is less subject to selection effects than the techniques used heretofore. About

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“…Röttger et al, 1981;Kato et al, 1986;Vincent et al, 1987;Hocking, 1997;Luce et al, 2001). Statistical comparisons of several radiosonde observations to UHF wind profiler were performed by Weber and Wuertz (1990) as well as to VHF radar measurements by Thomas et al (1997) taking into account the influence of aspect sensitive backscatter in the analysis.…”

Section: Introductionmentioning

confidence: 99%

Comparison of wind measurements in the troposphere and mesosphere by VHF/MF radars and in-situ techniques

et al. 2008

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Abstract. Radar wind observations at frequencies between 1.98 and 53.5 MHz obtained at polar latitudes were compared to in-situ wind measurements by radiosondes at tropospheric altitudes and to winds from falling spheres at mesospheric altitudes. Comparisons are shown for several campaigns of radiosonde and falling sphere observations. The radar wind directions agree well to the radiosonde and falling sphere observations and are highly correlated. The winds estimated from radar measurements are less than the radiosonde data by about 15% for spaced antenna observations and by about 10% for the Doppler beam swinging experiment. At mesospheric altitudes the spaced antenna winds obtained from the wide-beam Andenes MF radar are underestimated in the order of 35% and winds from the narrow-beam Saura MF radar are underestimated by about 20% compared to falling sphere winds at altitudes between 70 and 80 km. Furthermore, the relation between wind measurements using narrow-beam and wide-beam antenna arrangements for the MF radars is discussed and VHF radar observations are compared to the wide-beam MF radar.

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First results with the Adelaide VHF radar: spaced antenna studies of tropospheric winds

Cited by 59 publications

References 26 publications

A statistical study of underestimates of wind speeds by VHF radar

A statistical study of underestimates of wind speeds by VHF radar

A new method for the measurement of meteor speeds: The pre‐t_o phase technique

Comparison of wind measurements in the troposphere and mesosphere by VHF/MF radars and in-situ techniques

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First results with the Adelaide VHF radar: spaced antenna studies of tropospheric winds

Cited by 59 publications

References 26 publications

A statistical study of underestimates of wind speeds by VHF radar

A statistical study of underestimates of wind speeds by VHF radar

A new method for the measurement of meteor speeds: The pre‐to phase technique

Comparison of wind measurements in the troposphere and mesosphere by VHF/MF radars and in-situ techniques

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Product

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A new method for the measurement of meteor speeds: The pre‐t_o phase technique