Convective Plumes in the Planetary Boundary Layer, Investigated with an Acoustic Echo Sounder

Hall, Freeman F.; Edinger, James G.; Neff, W. D.

doi:10.1175/1520-0450(1975)014<0513:cpitpb>2.0.co;2

Cited by 47 publications

(25 citation statements)

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“…Note also that in downwind (or upwind) sounding, detached echo regions are not expected unless plume generation (or destruction) occurs within the sounder range or when the direction of the plume movement departs from the mean direction of the wind. Plumes have been observed travelling at angles up to 45 deg from the mean wind direction (Hall et al, 1975). When the direction of sounding is across wind, the plume echo regions do not, on average, appear tilted on the facsimile charts (see Figure 4).…”

Section: Instrumentation and Experimental Detailssupporting

confidence: 61%

Simultaneous horizontal and vertical acoustic sounding of the atmospheric boundary layer

Moulsley

Cole

Asimakopoulos

et al. 1979

Boundary-Layer Meteorol

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Some preliminary results from a series of experiments of simultaneous horizontal and vertical acoustic sounding of the atmosphere are described and discussed. The novel horizontal configuration offers some potential for investigating thermal plume motion and characteristics within the boundary layer. It could also be of use in assessing the importance of excess attenuation in quantitative acoustic sounding.

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Section: Instrumentation and Experimental Detailssupporting

confidence: 61%

Simultaneous horizontal and vertical acoustic sounding of the atmospheric boundary layer

Moulsley

Cole

Asimakopoulos

et al. 1979

Boundary-Layer Meteorol

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“…This cycle, which has been observed by many workers (e.g., McAllister et al, 1969), indicates the formation of the ground-based nocturnal temperature inversion and its subsequent dissipation following sunrise as atmospheric heating produces convectively unstable conditions. The short-lived vertical structures following dissipation are interpreted as turbulent 'roots' of upwardconvecting cells or thermal plumes (Hall et al, 1975;Frisch et al, 1976) extending to greater heights, which are carried across the sounder by the prevailing wind. It is therefore possible to classify the atmospheric boundary layer as (a) stable or (b) unstable, according to whether layers or plume structures were present in the sounder record.…”

Section: Classification Of Sounder Recordsmentioning

confidence: 99%

Preliminary results of atmospheric acoustic sounding at Calgary

Hicks

Smith

Irwin

et al. 1977

Boundary-Layer Meteorol

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Operation of a monostatic acoustic sounder on the campus of The University of Calgary for the period March to September, 1976, has provided data on the atmospheric boundary layer over Calgary. The formation and dissipation of the nocturnal temperature inversion layer leaves a clear signature in the sounder records. A trend is discerned in which the nocturnal layer tends to form at sunset, whereas convective instability is established some 2-3 hours after sunrise. Comparison of sounder records with an extensive set of radiosonde temperature profiles has shown that the height of the inversion layer can be determined reliably when a single, dark, ground-based return is visible on the sounder charts. On many occasions, however, the sounder detects multiple structures in the atmosphere. In these cases, it is difficult to establish a systematic correspondence of the turbulent structure as observed in the sounder records with the temperature profile as observed by the radiosonde.

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“…Many papers have described the principles and practice of acoustic Doppler wind measurements (e.g., Beran et al, 1974;Hall et al, 1975;Peters et al, 1978) March 1978-February 1979 At the start of this project, we had planned to construct a planar-array antenna system to make phase-shift angle-of-arrival measurements.…”

Section: Relationship To the Acoustic Doppler Techniquementioning

confidence: 99%

Study of Remote Wind Measurement Using Acoustic Angle-of-Arrival Techniques.

Russell¹,

Liston²,

DeLateur³

1981

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APR 81 P B RUSSELL, 4 M LISTON, S A DELATEUR DAA629-7B-C-OOO9 F4CLASSIFIEDA-1801-es N V STUDY OF REMOTE WIND MEASUREMENT USING ACOUSTIC ANGLE-OF-ARRIVAL0TECHNIQUES.-"Final x~eport, Approved for public release; distribution unlimited. NA SUPPLEMENTARY NOTESThe view, opinions, and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position, policy, or decision, unless so designated by other documentation. KEY WORDS (Continue on reverse side if necessary and identify by block number)20 ABSTRACT (Continue on reverse side if necessary and identify by block number)-An angle-of-arrival sodar system was designed, built, and tested with the goal of determining boundary-layer winds.The system measures the backscattered signal induced in two closely spaced microphones on a single parabolic receiver antenna; the angle of arrival is calculated from the relative signal amplitudes. This is the acoustic analog of the amplitude-monopulse radar technique. However, the acoustic system uses distributed (atmospheric) targets and a fixed (not steerable) antenna.Tests demonstrated that the system can receive atmospheric echoes and process the analog signals to estimate angle-of-arrival (hence, layer-averaged wind) when signal-to-noise ratios are adequate. However, the validity of these wind estimates was not demonstrated with correlative wind data. Digital processing techniques were. D D FORM

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Convective Plumes in the Planetary Boundary Layer, Investigated with an Acoustic Echo Sounder

Cited by 47 publications

References 0 publications

Simultaneous horizontal and vertical acoustic sounding of the atmospheric boundary layer

Simultaneous horizontal and vertical acoustic sounding of the atmospheric boundary layer

Preliminary results of atmospheric acoustic sounding at Calgary

Study of Remote Wind Measurement Using Acoustic Angle-of-Arrival Techniques.

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