Organized Roll Circulation and Transport of Mineral Aerosols in the Atmospheric Boundary Layer     

Vazaeva  N. V.  Chkhetiani  O. G.  Maksimenkov  L. O. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(2):152-166

Izvestiya, Atmospheric and Oceanic Physics - An investigation into mesoscale roll circulation and its transport characteristics in the atmospheric boundary layer (ABL) is carried out. The case...  相似文献   

Estimating helicity in the atmospheric boundary layer from acoustic sounding data     

N. V. Vazaeva  O. G. Chkhetiani  R. D. Kouznetsov  M. A. Kallistratova  V. F. Kramar  V. S. Lyulyukin  D. D. Kuznetsov 《Izvestiya Atmospheric and Oceanic Physics》2017,53(2):174-186

Distributions of the velocity-field helicity in the atmospheric boundary layer have been obtained from acoustic sounding data. The helicity of large-scale motions (0.3–0.6 m/s²) exceeds (by an order of magnitude) its independently measured turbulent values, which are close to helicity averaged over the layer (0.02–0.12 m/s²). In the absence of strong convection, there is good correlation between helicity and wind velocity squared at upper sounding levels of 400 to 600 m.  相似文献   

On Algebraic Perturbations in the Atmospheric Boundary Layer     

Chkhetiani  O. G.  Vazaeva  N. V. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(5):432-445

Izvestiya, Atmospheric and Oceanic Physics - A simple model for the development of submesoscale perturbations in the atmospheric boundary layer (ABL) is proposed. The growth of perturbations is...  相似文献   

Helicity and Turbulence in the Atmospheric Boundary Layer     

Vazaeva  N. V.  Chkhetiani  O. G.  Kurgansky  M. V.  Kallistratova  M. A. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(1):29-46

Izvestiya, Atmospheric and Oceanic Physics - Helicity is inherent in many circulating motions and structures in the atmospheric boundary layer (ABL), where it is continuously reproduced due to the...  相似文献   

Sodar Sounding of the Atmospheric Boundary Layer: Review of Studies at the Obukhov Institute of Atmospheric Physics,Russian Academy of Sciences   总被引：1，自引：0，他引：1  

M. A. Kallistratova  I. V. Petenko  R. D. Kouznetsov  S. N. Kulichkov  O. G. Chkhetiani  I. P. Chunchusov  V. S. Lyulyukin  D. V. Zaitseva  N. V. Vazaeva  D. D. Kuznetsov  V. G. Perepelkin  G. A. Bush 《Izvestiya Atmospheric and Oceanic Physics》2018,54(3):242-256

Acoustic sounders (sodars) are the simplest and economically most effective devices for the ground-based remote sensing of the lower troposphere. Using sodars, a vast amount of knowledge about the structure and dynamics of the atmospheric boundary layer (ABL) has been obtained. The principal physics of sodar sounding was given by A.M. Obukhov in two short theoretical articles published in the Reports of the USSR Academy of Sciences in 1941: “On the Scattering of Sound in a Turbulent Flow” and “On the Distribution of Energy in the Spectrum of a Turbulent Flow.” In the late 1950s, Obukhov initiated the development of theoretical and experimental studies of sound scattering by turbulence, as well as a practical sodar sounding of the ABL at the Institute of Atmospheric Physics (IAPh). The present work is a short review of sodar applications in studies of the ABL based on results obtained at IAPh in the 1980s–2000s. The results of recent studies of low-level jets and Kelvin–Helmholtz billows in the stable stratified ABL are described in more detail.  相似文献   

Turbulent Helicity in the Atmospheric Boundary Layer     

Otto G. Chkhetiani  Michael V. Kurgansky  Natalia V. Vazaeva 《Boundary-Layer Meteorology》2018,168(3):361-385

We consider the assumption postulated by Deusebio and Lindborg (J Fluid Mech 755:654–671, 2014) that the helicity injected into the Ekman boundary layer undergoes a cascade, with preservation of its sign (right- or alternatively left-handedness), which is a signature of the system rotation, from large to small scales, down to the Kolmogorov microscale of turbulence. At the same time, recent direct field measurements of turbulent helicity in the steppe region of southern Russia near Tsimlyansk Reservoir show the opposite sign of helicity from that expected. A possible explanation for this phenomenon may be the joint action of different scales of atmospheric flows within the boundary layer, including the sea-breeze circulation over the test site. In this regard, we consider a superposition of the classic Ekman spiral solution and Prandtl’s jet-like slope-wind profile to describe the planetary boundary-layer wind structure. The latter solution mimics a hydrostatic shallow breeze circulation over a non-uniformly heated surface. A 180°-wide sector on the hodograph plane exists, within which the relative orientation of the Ekman and Prandtl velocity profiles favours the left rotation with height of the resulting wind velocity vector in the lowermost part of the boundary layer. This explains the negative (left-handed) helicity cascade toward small-scale turbulent motions, which agrees with the direct field measurements of turbulent helicity in Tsimlyansk. A simple turbulent relaxation model is proposed that explains the measured positive values of the relatively minor contribution to turbulent helicity from the vertical components of velocity and vorticity.  相似文献