Measuring Heat Flux and Structure Functions of Temperature Fluctuations with an Acoustic Doppler Sodar

Weill, Alain; Klapisz, C.; Strauss, B. E.; Baudin, François; Jaupart, Claude; Grunderbeeck, P. Van; Goutorbe, J.P.

doi:10.1175/1520-0450(1980)019<0199:mhfasf>2.0.co;2

Cited by 82 publications

(38 citation statements)

References 17 publications

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“…Brown and Hall 1978), and the possibility of reliable quantitative measurements of C 2 T by using a sodar was shown in many studies (e.g. Coulter and Wesely 1980;Weill et al 1980;Gur'yanov et al 1987;Asimakopoulos et al 1983;Danilov et al 1994). The applicability of the concept of locally isotropic turbulence, and consequently the structure parameter C 2 T and Eqs.…”

Section: Sodar Measurementsmentioning

confidence: 99%

Wavelike Structures in the Turbulent Layer During the Morning Development of Convection at Dome C, Antarctica

Petenko

Argentini

Casasanta

et al. 2016

Boundary-Layer Meteorol

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In the period January-February 2014, observations were made at the Concordia station, Dome C, Antarctica to study atmospheric turbulence in the boundary layer using a high-resolution sodar. The turbulence structure was observed beginning from the lowest height of about 2 m, with a vertical resolution of less than 2 m. Typical patterns of the diurnal evolution of the spatio-temporal structure of turbulence detected by the sodar are analyzed. Here, we focus on the wavelike processes observed within the transition period from stable to unstable stratification occurring in the morning hours. Thanks to the high-resolution sodar measurements during the development of the convection near the surface, clear undulations were detected in the overlying turbulent layer for a significant part of the time. The wavelike pattern exhibits a regular braid structure, with undulations associated with internal gravity waves attributed to Kelvin-Helmholtz shear instability. The main spatial and temporal scales of the wavelike structures were determined, with predominant periodicity of the observed wavy patterns estimated to be 40-50 s. The horizontal scales roughly estimated using Taylor's frozen turbulence hypothesis are about 250-350 m.

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Section: Sodar Measurementsmentioning

confidence: 99%

Wavelike Structures in the Turbulent Layer During the Morning Development of Convection at Dome C, Antarctica

Petenko

Argentini

Casasanta

et al. 2016

Boundary-Layer Meteorol

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“…THE uW2 PROFILE METHOD Many workers have been used the ow2 measurements by an AS and profile methods based on similarity theory to evaluate the heat flux and the first inversion height under convective atmospheric conditions [6,7]. The profile of ow in the surface layer is well-known [8] wh~ch under convective conditions is nearly a linear function of height [8]:…”

Section: Introductionmentioning

confidence: 82%

Estimation of the atmospheric surface momentum and heat fluxes using a high resolution acoustic radar

et al. 1994

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The surface heat flux (Qo) and the friction velocity (u,) are important parameters of the Atmospheric Boundary Layer (ABL). Vertical velocity variance ( 0~2 ) profiles have been used to estimate the parameters Qo and u, from Acoustic Sounder (AS) data according to the similarity theory. A comparison was made using data from a 12 m high mast equipped with humidity, and fast responding wind and temperature sensors and a high resolution monostatic AS. The comparison confirms the ability of the ow2 profile method to provide, even in a noisy environment (inhabitant area), estimates of these parameters with reasonable accuracy and on a continuous basis. The requirements for the method to be applied is that convective conditions or a minimum mechanical mixing exist and the level of acoustic noise is not too high.

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“…The minisodar can also be used in the ''classic" convective boundary layer t o estimate surface fluxes of heat and momentum using either the standard deviation of vertical velocity, ow (Asimakopoulos, et al, 1983;Weill et al, 1980) or the temperature structure parameter, C T~ (Coulter et al, 1992). The advantage of the minisodar for these estimates lies in its high sample rate and acurate velocity estimates compared with conventional…”

Section: Convective ''Classic" Planetary Boundary Layermentioning

confidence: 99%

Effects of stability on the profiles of vertical velocity and its variance in katabatic flow

Coulter

Martin

1996

Boundary-Layer Meteorol

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Measuring Heat Flux and Structure Functions of Temperature Fluctuations with an Acoustic Doppler Sodar

Cited by 82 publications

References 17 publications

Wavelike Structures in the Turbulent Layer During the Morning Development of Convection at Dome C, Antarctica

Wavelike Structures in the Turbulent Layer During the Morning Development of Convection at Dome C, Antarctica

Estimation of the atmospheric surface momentum and heat fluxes using a high resolution acoustic radar

Effects of stability on the profiles of vertical velocity and its variance in katabatic flow

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