排序方式： 共有16条查询结果，搜索用时 15 毫秒
11.
D. V. Zaitseva M. A. Kallistratova V. S. Lyulyukin R. D. Kouznetsov D. D. Kuznetsov 《Izvestiya Atmospheric and Oceanic Physics》2018,54(2):173-181
Variations in the intensity of turbulence during wave activity in the stable atmospheric boundary layer over a homogeneous steppe surface have been analyzed. Eight wave activity episodes recorded with a Doppler sodar in August 2015 at the Tsimlyansk Scientific Station of the Obukhov Institute of Atmospheric Physics have been studied. These episodes include seven trains of Kelvin–Helmholtz waves and one train of buoyancy waves. Variations in the rms deviation of the vertical wind-velocity component, the temperature structure parameter, and vertical heat and momentum fluxes have been estimated for each episode of wave activity. It has been found that Kelvin–Helmholtz waves slightly affect the intensity of turbulence, while buoyancy waves cause the temperature structure parameter and the vertical fluxes to increase by more than an order of magnitude. 相似文献
12.
Yushkov V. P. Kurbatova M. M. Varentsov M. I. Lezina E. A. Kurbatov G. A. Miller E. A. Repina I. A. Artamonov A. Yu. Kallistratova M. A. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(5):389-406
Izvestiya, Atmospheric and Oceanic Physics - Using the example of an analysis of an extreme lowering of temperature in Moscow in January 2017, the horizontal and vertical extent of the urban heat... 相似文献
13.
We evaluate the statistical properties of low-level jets (LLJs) observed by means of a network of Doppler sodars in the Moscow
region, Russia. Continuous long-term measurements of the echo-signal intensity and wind-velocity profiles were carried out
in July 2005 and in 2008–2010 synchronously in the centre of Moscow and at a rural site. The summertime nocturnal LLJs have
a very clear diurnal cycle and exhibit features predicted by the Blackadar mechanism. In contrast, the long-lasting wintertime
jets do not have any clear diurnal variability. The urban environment strongly influences LLJs in both seasons: above the
city LLJs are higher, weaker and observed more rarely than at the rural site. In very cold periods (air temperature below
−8°C) no LLJs were observed over the city, instead convection emerged in the urban boundary layer. The results are based on
observations made in July 2005, January and December 2009, and January 2011. 相似文献
14.
15.
Summary This paper presents a brief synopsis of past, current and anticipated progress and problems in the use of acoustic remote
sensing for basic and applied research of the lower atmosphere. The potential and reality of the sodar for determination of
meteorological parameters and turbulence characteristics is discussed. Sodars’ place alongside other ground-based remote sensors,
including radar wind profilers, radioacoustic sounding systems (RASS) and lidars, is elucidated. Areas of atmospheric research
where Doppler sodar has certain advantages are described such as cost, sensitivity, spatial and temporal resolution and surface
layer measurements. The use of sodar in networks of integrated radar/RASS systems designed to supply uninterrupted monitoring
of atmospheric parameters for improvements in forecasts of weather and air quality is demonstrated.
The special potential role of sodar in education and training of specialists is suggested to aid in developing and using new
methods of atmospheric measurements and meeting the requirements of modern environmental science.
A number of problems are formulated whose solution would favor further advancement of acoustic remote sensing in integrated
systems for remote monitoring of the atmospheric boundary layer.
Received November 23, 1998 Revised January 29, 1999 相似文献
16.
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