Spatiotemporal dynamics of the wind velocity variance from the data of acoustic sounding of the atmospheric boundary layer

2015 ◽  
Author(s):  
O. F. Kapegesheva ◽  
N. P. Krasnenko ◽  
M. V. Tarasenkov ◽  
L. G. Shamanaeva
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Wind Velocity ◽  
Spatiotemporal Dynamics ◽  
Acoustic Sounding ◽  
Velocity Variance

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

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 421
Author(s):  
Alexander Potekaev ◽  
Liudmila Shamanaeva ◽  
Valentina Kulagina
Keyword(s):  
Boundary Layer ◽  
Kinetic Energy ◽  
Atmospheric Boundary Layer ◽  
Turbulent Kinetic Energy ◽  
Time Of Day ◽  
Linear Increase ◽  
Spatiotemporal Dynamics ◽  
Intermediate Layers ◽  
Subsequent Decrease ◽  
Stable Atmospheric Boundary Layer

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 TKE 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 TKE contribution to the total atmospheric kinetic energy considerably (by a factor of 2.5–3) exceeded the corresponding MKE contribution.

scholarly journals Determination of the Structural Characteristic of the Refractive Index of Optical Waves in the Atmospheric Boundary Layer with Remote Acoustic Sounding Facilities

Atmosphere ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 711 ◽  
Author(s):  
Odintsov ◽  
Gladkikh ◽  
Kamardin ◽  
Nevzorova
Keyword(s):  
Experimental Data ◽  
Boundary Layer ◽  
Refractive Index ◽  
Atmospheric Boundary Layer ◽  
Structural Characteristic ◽  
Structural Characteristics ◽  
Acoustic Sounding ◽  
Optical Waves ◽  
Ultrasonic Anemometer

The structural characteristic of the refractive index of optical waves was calculated from experimental data on the microstructure of the temperature turbulence in the atmospheric boundary layer. The experimental data were obtained with an acoustic meteorological radar (sodar), ultrasonic anemometer–thermometer, and meteorological temperature profilometer. Estimates of the structural characteristics for different conditions in the atmospheric boundary layer are presented and were compared with model profiles.

Acoustic sounding of the atmospheric boundary layer at Halley, Antarctica

1989 ◽  
Vol 1 (4) ◽  
pp. 363-372 ◽  
Author(s):  
Alistair D. Culf
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Surface Wind ◽  
Gravity Currents ◽  
Wind Regime ◽  
Acoustic Sounding ◽  
Use Of Data

The records obtained from a monostatic acoustic sounder run at Halley, Antarctica, have been analysed with the use of data from instruments on a 32 m mast and from radiosonde ascents. Echoes representing ground-based layers, waves, and shallow gravity currents are discussed. The spiky ground-based echo is related to a westerly surface wind, whilst a layered wavy flow is related to surface easterlies. Such relationships are consistent with the sloped inversion wind regime at Halley.

Simultaneous horizontal and vertical acoustic sounding of the atmospheric boundary layer

1979 ◽  
Vol 17 (2) ◽  
pp. 223-230 ◽  
Author(s):  
T. J. Moulsley ◽  
R. S. Cole ◽  
D. N. Asimakopoulos ◽  
S. J. Caughey
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Acoustic Sounding

scholarly journals On the algebraic perturbations in atmospheric boundary layer

2019 ◽  
Vol 55 (5) ◽  
pp. 62-75
Author(s):  
O. G. Chkhetiani ◽  
N. V. Vazaeva
Keyword(s):  
Experimental Data ◽  
Boundary Layer ◽  
High Resolution ◽  
Simple Model ◽  
Velocity Profile ◽  
Atmospheric Boundary Layer ◽  
Wind Field ◽  
Acoustic Sounding ◽  
Algebraic Instability ◽  
Scientific Station

A simple model for the development of submesoscale perturbations in the atmospheric boundary layer (ABL) is proposed. The growth of perturbations is associated with the shear algebraic instability of the wind velocity profile in the atmospheric boundary layer (ABL). For the scales of optimal perturbations (streaks) in the lower part of the ABL, estimates of their sizes were obtained about 100-200 m vertically and 300-600 m horizontally. Similar scales are noted for experimental data on the structure of the wind field in the lower part of the ABL, obtained in 2017, 2018 in the summer at the Tsimlyansk Scientific Station at the acoustic sounding of the atmosphere by the Doppler three-component minisodar of high resolution.

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