Dynamics of the Kinetic Energy in the Atmospheric Boundary Layer from the Results of Minisodar Measurements

Shamanaeva, L. G.; Potekaev, A. I.; Krasnenko, N. P.; Kapegesheva, O. F.

doi:10.1007/s11182-019-01668-1

Cited by 15 publications

(19 citation statements)

References 7 publications

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“…It should be noted that our analysis of the influence of the averaging period (10, 20, or 30 The 3rd International Electronic Conference on Atmospheric Sciences (ECAS 2020), 16-30 November 2020; Sciforum Electronic Conference Series, Vol. 3, 2020 min) on the E values performed in [9] demonstrated that they were practically independent of the averaging time for these averaging periods. The same is true for the case under consideration.…”

Section: Resultsmentioning

confidence: 83%

“…A Doppler acoustic radar (sodar) allows long-term continuous observations to be performed of the spatiotemporal dynamics of both average values and variances of the three wind velocity components in the ABL and hence the spatiotemporal dynamics of the kinetic energy of the atmosphere to be investigated. The kinetic energy components EMКE and ETKE were calculated from the data of minisodar measurements using the formulas [9,10]:…”

Section: Applied Methods and Approachesmentioning

confidence: 99%

“…Strong interaction of sound waves with the atmosphere and the ability to obtain information in real time and round the clock with much higher spatial and temporal resolution make sodars unique tools for investigation of the wind velocity vector field in the ABL. The application of the Doppler acoustic radars (sodars) allows simultaneously long time series of continuous observations of vertical profiles of both average values and variances of three wind velocity components to be obtained in real time [3,7,9]. The data with high spatial (up to several meters) and temporal resolution (statistically reliable profiles of wind velocity components with averaging from 1 to 30 min) can be obtained, and their spatiotemporal dynamics can be analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, in [9] results of preliminary analysis of the spatiotemporal dynamics of the kinetic energy of the atmosphere reduced to unit air mass retrieved from data of minisodar measurements were presented.…”

Section: Introductionmentioning

confidence: 99%

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Diurnal Dynamics of the Reduced Turbulent Kinetic Energy of in the Atmospheric Boundary Layer from Minisodar Measurements

Shamanaeva

Potekaev

Кулагина

2020

Proceedings of the 3rd International Electronic Conference on Atmospheric Sciences

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Based on acoustic remote measurements of the diurnal dynamics of three wind velocity components and their variances in the lower 200-meter layer of the atmosphere, the kinetic energy of the atmosphere reduced to unit mass is estimated, with a particular emphasis on the turbulent kinetic energy component. For a 24-h period of continuous minisodar observations, the turbulent energy in the surface layer was very low to altitudes of ~50 m. With increase in altitude from 50 to 100 m, the turbulent kinetic energy quickly increased, and at altitudes exceeding 100 m, its fast growth is observed, with a maximum at altitudes of 150-200 m. Essential influence of time of the day on the results of observations was established. Thus, at night at the same altitudes the kinetic energy density first did not exceed 20 J/kg, and its moderate growth (from 20 to 50 J/kg) was observed with increasing time. In the morning, the maximum energy density of air masses was observed. After sunrise, the turbulent component of the kinetic energy density rapidly decreased. It is essential that the system the Earth surface-the near-ground air layer tends to an equilibrium state. As a consequence, the spread of values of the turbulent energy is reduced. The most significant changes were observed at altitudes in the range 100-200 m. It is essential that at altitudes up to 50-100 m, time of the day had no significant effect, because at these altitudes the turbulent energy was low and remained practically unchanged with time. Irrespective of time of the day, the maximum turbulent energy was observed at altitudes in the range 100-200 m that pose the greatest danger to small flying objects. The corresponding estimations are presented.

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Section: Resultsmentioning

confidence: 83%

Section: Applied Methods and Approachesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diurnal Dynamics of the Reduced Turbulent Kinetic Energy of in the Atmospheric Boundary Layer from Minisodar Measurements

Shamanaeva

Potekaev

Кулагина

2020

Proceedings of the 3rd International Electronic Conference on Atmospheric Sciences

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“…A very large volume of inhomogeneous measurement data and a presence of outliers excluded their manual adjustment. In [14][15][16][17] we have developed a special program of sodar data preprocessing based on sensoring of data samples to eliminate the oulliers using the pendulum truncation algorithm and presented some results of analysis of the spatiotemporal dynamics of the kinetic wind energy in the…”

Section: Applied Approachmentioning

confidence: 99%

Spatiotemporal Dynamics of the Kinetic Energy in the Atmospheric Boundary Layer from Minisodar Measurements

Потекаев¹,

Shamanaeva²,

Кулагина³

2021

Preprint

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Spatiotemporal dynamics of the atmospheric kinetic energy and its components caused by the ordered and turbulent motions of air masses are estimated from minisodar measurements of three velocity vector components and their variances within the lowest 5–200 m layer of the atmosphere, with a particular emphasis on the turbulent kinetic energy. The layered structure of the total atmospheric kinetic energy has been established. From the diurnal hourly dynamics of the altitude profiles of the turbulent kinetic energy (TKE) retrieved from minisodar data, four layers are established by the character of the altitude TKE dependence, namely, the near-ground layer, the surface layer, the layer with a linear TKE increase, and the transitive layer above. In the first layer, the most significant changes of the ТКЕ were observed in the evening hours. In the second layer, no significant changes in the TKE values were observed. A linear increase in the TKE values with altitude was observed in the third layer. In the fourth layer, the TKE slightly increased with altitude and exhibited variations during the entire observation period. The altitudes of the upper boundaries of these layers depended on the time of day. The MKE values were much less than the corresponding TKE values, they did not exceed 50 m2/s2. From two to four MKE layers were distinguished based on the character of its altitude dependence. The two-layer structures were observed in the evening and at night (under conditions of the stable atmospheric boundary layer). In the morning and daytime, the four-layer MKE structures with intermediate layers of linear increase and subsequent decrease in the MKE values were observed. Our estimates demonstrated that the ТКЕ contribution to the total atmospheric kinetic energy considerably (by a factor of 2.5–3) exceeded the corresponding МКЕ contribution.

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Diurnal Dynamics of the Kinetic Energy in the Atmospheric Boundary Layer Retrieved from Minisodar Measurements

2021

Self Cite

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Based on the results of postprocessing of minisodar measurements of three wind velocity components and their variances in the lower 200-meter layer of the atmosphere, the diurnal hourly dynamics of the kinetic energy of the atmosphere reduced to unit air mass and its component E TKE (caused by turbulent pulsations of the wind velocity) and E MKE (caused by the mean wind velocity) are analyzed focusing on the turbulent kinetic energy. It is shown that during 24 hour continuous minisodar observations, E TKE was low up to 50 m, increased from 50 to 100 m, and fast increased at higher altitudes. A significant influence of the time of day on the observation results was noted. Thus, at night the kinetic energy did not exceed 20 J/kg and then increased with time from 20 to 50 J/kg. It reached a maximum in the morning. After sunrise, the turbulent kinetic energy quickly decreased, and the system underlying surface -near-surface air layer went into equilibrium. As a consequence, the spread of turbulent kinetic energy values decreased. The most significant changes were observed at altitudes of 100-200 m.Tthe time of day had no significant influence at altitudes of 50-100 m, and the E TKE values were low and remained practically unchanged with time. Irrespective of the time of day, the maximum turbulent kinetic energy was observed at altitudes of 100-200 m, which poses the greatest danger to unmanned aerial vehicles. The corresponding numerical estimations are presented.

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Dynamics of the Kinetic Energy in the Atmospheric Boundary Layer from the Results of Minisodar Measurements

Cited by 15 publications

References 7 publications

Diurnal Dynamics of the Reduced Turbulent Kinetic Energy of in the Atmospheric Boundary Layer from Minisodar Measurements

Diurnal Dynamics of the Reduced Turbulent Kinetic Energy of in the Atmospheric Boundary Layer from Minisodar Measurements

Spatiotemporal Dynamics of the Kinetic Energy in the Atmospheric Boundary Layer from Minisodar Measurements

Diurnal Dynamics of the Kinetic Energy in the Atmospheric Boundary Layer Retrieved from Minisodar Measurements

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