Turbulence Kinetic Energy Budget Profiles Derived from Doppler Sodar Measurements

Greenhut, Gary K.; Mastrantonio, G.

doi:10.1175/1520-0450(1989)028<0099:tkebpd>2.0.co;2

Cited by 28 publications

(24 citation statements)

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“…Time series of vertical wind velocities for each height interval (-27 m, range resolution of sodar) and for each time period were obtained. Spikes, if any, were removed from each time series using the method follo.wed by Greenhut and Mastrantonio (1989). The Raman lidar used in the present experiment consists of an excimer laser emitting at 308 nm and a vertically pointing 0.8 m diameter Cassegrain telescope equipped with two selection channels.…”

Section: Methodsmentioning

confidence: 99%

“…The mixed-layer height, zi, given in Table I is the average height of the lower boundary of the inversion layer on the facsimile record (Kaimal et al, 1982;Greenhut and Mastrantonio, 1989) during each of the time periods. It was shown by Weill et al (1980) that for shallow convective boundary layers with zi < 450 m, the vertical velocity variance (a,) profile can be used to deduce the heat-flux profile and the linear portion of the profile can be extrapolated to estimate the surface heat flux.…”

Section: Scaling Parametersmentioning

confidence: 99%

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Convective characteristics of the nocturnal urban boundary layer as observed with Doppler sodar and Raman lidar

Casadio

Sarra

Fiocco³

et al. 1996

Boundary-Layer Meteorol

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Convective plume patterns, characteristic of clear sky and light wind daytime boundary layers over land, were observed for two nights with a &i-axial Doppler sodar operated in the central area of Rome during the summer of 1994. An urban heat island effect, combined with a continuation of a breeze from the sea late into night during both days, is believed to be responsible for the observed nocturnal convection. Estimates of the surface heat flux and the vertical velocity scaling parameter are obtained from profiles of vertical velocity variance, and the Raman lidar water vapor measurements are used to obtain the humidity scaling parameter. Convective scaling results for vertical wind and humidity fairly agree with the results of other experiments and models. On the basis of available measurements, it appears that mixed-layer similarity formulations used to characterize the daytime convective boundary layer over horizontally homogeneous surfaces can also be applied to the nocturnal urban boundary layer during periods of reasonable convective activity.

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Section: Methodsmentioning

confidence: 99%

Section: Scaling Parametersmentioning

confidence: 99%

Convective characteristics of the nocturnal urban boundary layer as observed with Doppler sodar and Raman lidar

Casadio

Sarra

Fiocco³

et al. 1996

Boundary-Layer Meteorol

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“…Sodars or acoustic radars are widely used all over the world to investigate the structure and dynamics of the atmospheric boundary layer (ABL) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The principle of their operation is based on the effect of sound scattering by small-scale turbulent inhomogeneities of the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, including our papers, only results of measurements of individual turbulence characteristics are described. Many papers are devoted to measurements of the temperature and wind velocity structure characteristics [1][2][3][4][5][6][7]; results of acoustic sounding of the turbulent kinetic energy dissipation rate are presented, for example, in [8,9]; the wind velocity structure functions are considered in [10,11].…”

Section: Introductionmentioning

confidence: 99%

Sodars and their application for investigation of the turbulent structure of the lower atmosphere

Krasnenko

Shamanaeva

2016

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Possibilities of sodar application for investigation of the spatiotemporal dynamics of three components of wind velocity vector, longitudinal and transverse structural functions of wind velocity field, structural characteristics of temperature and wind velocity, turbulent kinetic energy dissipation rate, and outer scales of temperature and dynamic turbulence in the atmospheric boundary layer are analyzed. The original closed iterative algorithm of sodar data processing taking into account the classical and molecular absorption and the turbulent sound attenuation on the propagation path is used that allows the vertical profiles of the characteristics of temperature and wind velocity field to be reconstructed simultaneously and their interrelations to be investigated. It is demonstrated how the structure of temperature and wind turbulence is visualised in real time.

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“…For example, sodars have been used to study coastal land-/sea breeze circulations (Aggarwal et al 1980, Bacci et al 1984, Prakash et al 1992, the Antarctic stable boundary layer (King et al 1989, Argentini et al 1992, wind flow in complex terrain (Neff 1988, Neff & King 1987, 1988, gravity waves (Einaudi et al 1987, Cheung & Little 1990, Ralph et al 1993, low-level jets (Kataoka et al 1991, Kotroni et al 1994, and frontal passages (Gera & Weill 1987. Techniques have been developed to derive turbulence parameters such as the sensible heat flux (Sen Gupta et al 1986), turbulence kinetic energy budget (Greenhut & Mastrantonio 1989), and temperature structure functions (Moulsley et al 1981, Singal et al 1982. Sodars are also used in determining mixed layer height (Russell & Uthe 1978, Coulter 1979, Beyrich 1995, Asimakopoulos et al 2004, Emeis et al 2008.…”

Section: Introductionmentioning

confidence: 99%

Boundary Layer Characteristics over Aindanda Low-Mountain Pass of Kathmandu Valley, Nepal

Shrestha

Maharjan

et al. 2015

J. Inst. Sci. Tech.

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The early monsoon time boundary layer characteristics prevailing over Aindanda low-mountain pass of Kathmandu valley has been continuously monitored for the period of 11 to 24 June 2013. The study reveals that the Aindanda pass channels regional air masses from the western neighboring valley up into the Kathmandu valley as westerly/ northwesterly winds during the daytime whereas it drains air mass out of the valley during nighttime. The speed of the westerly/northwesterly wind over the pass often exceeds 6.5 ms -1 during the late afternoon. Nighttime mixing layer height (MLH) was highly fluctuating with an average around 300m whereas daytime MLH was suppressed limiting it in between 290-450m above the ground in early part of the day but reduced to 210-270m during the late afternoon.Comparison of diurnal variation of mixing layer height at Aindanda with that of the central area of the valley floor strongly suggests that air mass intruding into the Kathmandu valley through this pass is a cool density flow over the weakly stratified mixed layer of valley. The structure of the wind channeled through this pass indicates the possibility of making hydraulic jump in the western part of the Kathmandu valley, particularly, during the late afternoon time.

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Turbulence Kinetic Energy Budget Profiles Derived from Doppler Sodar Measurements

Cited by 28 publications

References 0 publications

Convective characteristics of the nocturnal urban boundary layer as observed with Doppler sodar and Raman lidar

Convective characteristics of the nocturnal urban boundary layer as observed with Doppler sodar and Raman lidar

Sodars and their application for investigation of the turbulent structure of the lower atmosphere

Boundary Layer Characteristics over Aindanda Low-Mountain Pass of Kathmandu Valley, Nepal

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