Anisimov et al. Transport of aeroelectricity of lower atmosphere
Transport of aeroelectricity in the lower atmosphere S.V. Anisimov1, N. M. Shikhova1, R.D. Kouznetsov2 1O.Yu.
Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences, Moscow, RF. 2A.M. Obukhov Institute of Atmospheric Physics of the Russian Academy of Sciences, Moscow, RF.
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Electroaerodynamics The purpose of research: 1) experimental studying of processes of transfer of aeroelectric field heterogeneities ΔEz, observable in a surface layer; 2) research of connections of transfer of aeroelectricity with profiles of wind speed (w, u) in a planetary boundary layer (PBL); 3) quantitative estimations of transfer of aeroelectricity by the cross-correlation functions between ΔEz and w, u.
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Scheme of location of the fluxmeters, meteorological complex and SODAR in the Borok Geophysical Observatory at May - June 2006. N 8 meteo
7
S
6
90 m
2m
SODAR
5
90 m 62 m
4
5м
10m
3 10m
2 1
2m 10m
1.5 m 10m
5m 1 m
3
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Remote sensing of aeroelectric field in eight points The aeroelectric field was measured synchronously at eight points located along the north–south direction; five of them have been placed on equal distances in 10 m, the other sensors were placed on distances in 102, 192 and 282 m from the first sensor in the line. Total length of a line was about 282 m. The sensors were installed at a height of 1,5 m.
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Remote sensing of aeroelectric field in eight points June 02 2006 Ez : 8-15 chann. - V/m 300 200
8 300
100 0
9
300 200
100
10
11
300 200
12
0 300
13 200
300 200
200 100
100 0
0 300
100 0
200
Typical daily record of aeroelectric field variations at the synchronous remote sensing in eight points.
100
14
0
100 300
0
15
200 100 0
UT, 1 min 0:00 2:00 4:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00
5
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Meteorological support of aeroelectrical observations 03 èþ í ÿ 2006 21
0
T, Ñ
18 15 12 9
5
Vx, ì /ñ
4
6
3 2 1
758
0
P, ì ì ðò. ñò. 756 754
0.40
Humidity, % Vz, ì /ñ
100 90 80 70 60 50 40
0.20 0.00 -0.20
LT 0:00 2:00 4:00 6:00 8:00 10:0012:0014:0016:0018:0020:0022:00 0:00
Daily trends of the basic meteorological data in surface layer, characteristic for conditions of “fair weather ”.
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Average high-altitude profiles a component of wind speed of PBL SODAR LATAN-2 of A.M. Obukhov Institute of Atmospheric Physics of the Russian Academy of Sciences Key parameters: high-altitude range - 20–300 m resolution on high - 10 m; time of sounding cycle - 10 s; acoustic pattern orientated upright and to the north-south and the west-east directions with zenithal corners in 300.
7
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Average high-altitude profiles a component of wind speed of PBL Height, m 200
160
2
Vertical profiles of wind speed w (1) , u (2) за 08:30 – 09:00 UT June 03 2006
1 120
80
40
V (m/s)
0 0.00
2.00
4.00
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Synchronous observations of aeroelectric field in 8 points during a southern wind June 29 2006 Ez, V/m
150
r=0 100
N
150
r = 10 m t= 2 s
50
100
r=20 m t=4 s
150
100
50
r = 30 m t= 6 s
150
50 150
S
100
r = 40 m t =8 s 100
50
r = 102 m t = 16 s
50
150
150
100
r = 192 m t = 36 s
100
50
r = 282 m t = 51 s
150
50
100
8:00
8:20
8:40
9:00
9:20
9:40UT
10:00
50
9
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Determination of speed of aeroelectrical wind
lag = -23 sek r=0.87
Cross-correlation functions were calculated for series of the second average data of Ez from 7 sensors concerning the data from the first sensor in a line. Example of lag and r between 1 and 6 sensors at June 03 2006 for 08:00 - 09:00 UT. 10
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Values of u at height 2m (V2m) and means of speeds of aeroelectric wind (VΔE), calculated on data of experiment 2006 V2m= 3.4 m/s VΔE = 4.7 m/s 300
V2m= -5 m/s VΔE = -3.3 m/s
250
Distance (m)
200
V2m= 2.3 m/s VΔE = 4.4 m/s
150
100
V2m= -4.5 m/s VΔE = -3.9 m/s
V2m= 2.5 m/s VΔE = 3.5 m/s
50
Lag (sek)
0 -100
-80
-60
-40
-20
0
20
40
60
80
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Variations of w at height 90 m (w 90), u in S-N direction at height 90 m (u 90) and E z (Ez) at surface layer for 08:00 – 09:00 UT June 03, 2006
2.0
m/s
V/m 300
w 90
0.0
6.0 4.0
200
Ez
m/s
u 90
2.0 0.0
UT (hh:mm) -2.0
8:00
8:10
8:20
8:30
8:40
8:50
9:00
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Maximum of cross-correlation function of E and w data for 08:00 – 09:00 UT June 03, 2006 250
Height (m)
200
150
100
50
Kross-corr.value
0 0.0
0.2
0.4
0.6
0.8
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Aeroelectric structures at June 03 2006
DE(r), (V/m)2
m UT (h)
14
Anisimov et al. Transport of aeroelectricity of lower atmosphere
1000
а)
800 600 400 200 0 04:00
04:10
04:20
04:30
04:40
04:50
05:00
UT (hh:mm)
1200
scale of variations (sek)
scale of variations (sek)
1200
1000
b)
04:00 - 05:00 UT
800 600 400 200
04:00
Wavelet spectra of w at height 80 m (a), and E at height 1.5.m (b) for data June 12 2006 at
04:10
04:20
04:30
UT(hh:mm)
04:40
04:50
05:00
Anisimov et al. Transport of aeroelectricity of lower atmosphere
Conclusion 1. By results of the field aerophysical observations which have been carried out in Borok Geophysical Observatory, the speeds of transportation of aeroelectric field heterogeneity in a surface layer are determined experimentally. 2. Speeds of aeroelectric wind are distinct from horizontal speed of a wind in a surface layer and connected to high-altitude profiles of a space charge and components of a wind speed. It is shown, that the maximum cross-correlation function of intensity of an aeroelectric field variations in a surface layer ΔEz and vertical components of a wind speed w in PBL corresponds to a range of heights 80÷140 m. 3. It is established, that speed of transportation of an aeroelectric field heterogeneity in a surface layer is determined by horizontal speed of a wind at height of a cross-correlation function maximum of ΔEz and w. 4. It is supposed, that presence of a layer of the cross-correlation maximum ΔEz and w in conditions advanced convection is caused by presence of aeroelectric structures and formation of 16 layers of the increased density of a space charge.
Anisimov et al. Transport of aeroelectricity of lower atmosphere
REFERENCES Hoppel, W.A., R.V. Anderson and J.C. Willet, Atmospheric Electrisity in the Planetary Boundary Layer, The Earth's Electrical Environment. Krider, E.P. and Roble, R.G., Eds. - Washington: Natl. Acad. Press, 149–165, 1986. Anisimov, S.V., N.M. Shichova, E.A. Mareev, and M.V. Shatalina, Structure function and spectra of turbulent fluctuations in the aeroelectric field, Izvestiya, Atmospheric and Oceanic Physics, 39(6), 766-781, 2003. Kallistratova, M.A., R.L. Coulter, Application of sodars in the study and monitoring of the environment, Meteorology and Atmospheric Physics, 85, 2137, 2004. Marshall, T.C., W.D. Rust, M. Stolzenburg, W. Roeder, and P.R. Krehbiel, Enhanced fair-weather electric fields soon after sunrise, Proc. 11-th Int. Conf. on Atmospheric Electricity, Guntersville, Alabama, 583-586, 1999. Anisimov, S.V., E. A. Mareev and S. S. Bakastov, On the generation and evolution of aeroelectric structures in the surface layer, J. Geophys. Res., 104 (12), 14359-14367, 1999. Shatalina, M.V., E.A Mareev, S.V. Anisimov, and N.M. Shikhova, Modeling of dynamics of electric field in the atmosphere by the method of test structures, Radiophysics and Quantum Electronics, 48(8), 648-660, 2005.
Anisimov et al. Transport of aeroelectricity of lower atmosphere
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