AMMA Conference (6-10 November 2006) UHF-VHF Wind Profiler Radars Network. Sodars Network
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1 AMMA Conference (6-10 November 2006) UHF-VHF Wind Profiler Radars Network Bernard Campistron, Laboratoire d Aérologie Sodars Network Doug Parker, University of Leeds amma conf 6-10 nov 06 1
2 AMMA experiment (2006) Investigation on the West African Monsoon and climate variability Wind Profiler Radar Network UHF Bamako (Mali, ASECNA) Ouagadougou (Burkina- Faso, ASECNA) Niamey (Niger, ARM) Djougou (Bénin, CNRM) VHF Djougou (Bénin, CNRM) amma conf 6-10 nov 06 2
3 UHF and VHF Wind Profilers 20 Km 15 Km Free Atmosphere Radar VHF 1.5 Km 3 Km Atmospheric Boundary Layer 100 m Radar UHF amma conf 6-10 nov 06 3
4 Example: Atmospheric Boundary Layer (ABL) - Wind Profiler UHF/RASS Vertical Coverage 100 m up to 2-3 km Vertical Resolution: 75 m Temporal Resolution: 5 minutes Measured variables U, V,W, ABL Depth (Zi) amma conf 6-10 nov 06 4
5 Example: Atmospheric Boundary Layer (ABL) - Wind Profiler UHF/RASS Measured Variables Turbulent Kinetic Energy Dissipation Rate (ε) U W, V W, W T Temperature (RASS) 1 km Precipitation Rate amma conf 6-10 nov 06 5
6 Example: Free Atmosphere - Wind Profiler VHF Vertical Coverage 2 km 16 km (20 km?) Vertical Resolution: 375 m Temporal Resolution: 15 min Measured Variables: U, V, W Tropopause Height Detection Information On Turbulence Humidity from reflectivity amma conf 6-10 nov 06 6
7 Example: Free Atmosphere - Wind Profiler VHF amma conf 6-10 nov 06 7
8 Bamako Mali (ASECNA) UHF wind profiler Continuous monitoring operation cycling over 2 modes Mean cycle duration: 2 30 HIGH MODE Radial range: R 0 : 75 m R max : 6020 m dr: 150m radial resolution: 375 m gate number: 40 pulse repetition frequency: Hz Degreane UHF PCL beams UHF Doppler radar One Vertical and two 73 Oblique beams Frequency: 1290 MHz Peak Power: 500 Watt Beam width: 8.5 Altitude: 378 m LOW MODE Radial range: R 0 : 71 m R max : 2208 m dr: 37.5 m radial resolution: 150 m gate number: 58 pulse repetition frequency: Hz This Radar is operated since March The radar is out of order from January 2006 until now. So no January 2006 data acquired during AMMA SOP October 2006 no data no data no data no data amma conf 6-10 nov 06 8
9 Bamako Mali (ASECNA) UHF wind profiler: Example of observations (2005) Composite day of a dry period (March 2005) and of a humid period (July 2005) amma conf 6-10 nov 06 9
10 Ouagadougou Burkina-Faso (ASECNA) UHF wind profiler Continuous monitoring operation cycling over 2 modes Mean cycle duration: 2 HIGH MODE Radial range: R 0 : 75 m R max : m dr: 150m radial resolution: 375 m gate number: 70 pulse repetition frequency: Hz Degreane UHF PCL beams UHF Doppler radar One Vertical and two 73 Oblique beams Frequency: 1290 MHz Peak Power: 500 Watt Beam width: 8.5 Altitude: 308 m LOW MODE Radial range: R 0 : 75 m R max : 5250 m dr: 150 m radial resolution: 150 m gate number: 70 pulse repetition frequency: Hz The Radar is operated since June Information from ASECNA show that the radar worked continuously without trouble until now. It was not yet possible to get the raw data. June 2006 October 2006 Data collection OK Data collection OK Data collection OK amma conf 6-10 nov 06 10
11 Niamey Niger (ARM) UHF wind profiler Continuous monitoring operation cycling over 2 modes Mean cycle duration: HIGH MODE Radial range: R 0 : 300 m R max : 6000 m dr: 150m radial resolution: m gate number: pulse repetition frequency: Hz Vaisala UHF 3 beams UHF Doppler radar One Vertical and two 73 Oblique beams Frequency: 1290 MHz Peak Power: Beam width: Altitude: 222 m LOW MODE Radial range: R 0 : 100 m R max : 2500 m dr: 75 m radial resolution: m gate number: pulse repetition frequency: Hz The Radar is operated since April, 4 th, According to the web data base this radar worked without trouble continuously until now. 4 April 2006 October 2006 Data collection OK Data collection OK Data collection OK amma conf 6-10 nov 06 11
12 Niamey Niger (ARM) UHF wind profiler Example of observation amma conf 6-10 nov 06 12
13 Djougou Bénin (CNRM) UHF wind profiler Continuous monitoring operation cycling over 2 modes Mean cycle duration: 4 10 HIGH MODE Radial range: R 0 : 147 m R max : m dr: 150m radial resolution: 375 m gate number: 90 pulse repetition frequency: Hz Degreane UHF PCL beams UHF Doppler radar One Vertical and four 73 Oblique beams disposed every 90 along azimuth Frequency: 1274 MHz Peak Power: Watt Beam width: 8.5 Altitude: 431 m LOW MODE Radial range: R 0 : 73 m R max : 6298 m dr: 75 m radial resolution: 150 m gate number: 84 pulse repetition frequency: Hz Radar operated since 8 April 2006; end of observation first week of November 2006 [08april06 25april06: OK] [26april06 23jun06: NO DATA; radar off] [23jun06 07aug06: radar on; 30 db loss, only observation in rain] [07aug06 31aug06: OK] [01sep06 10sep06: radar off] [10sep06 now: OK] 8 April June 7 August 31 August October 2006 ok No data Rain only ok ok amma conf 6-10 nov 06 13
14 Djougou Bénin (CNRM) UHF wind profiler Example of observation A Composite Day during the Dry Season (April 2006) amma conf 6-10 nov 06 14
15 Djougou Bénin (CNRM) UHF wind profiler Example of observation A Day during the Rainy Season (08 August 2006) amma conf 6-10 nov 06 15
16 Djougou Bénin (CNRM) VHF wind profiler Continuous monitoring operation cycling over 2 tropospheric modes and 1 mesospheric electrojet mode Mean cycle duration: 23 HIGH MODE + LOW MODE Radial range: R 0 : 1462 m R max : m dr: 375 m INSU/METEO VHF 5 beams VHF Doppler radar One Vertical and four 75 Oblique beams disposed every 90 along azimuth Pulse coded (8 moments) Frequency: 45 MHz Peak Power: Watt Beam width: 6.0 Altitude: 431 m radial resolution: 375 m gate number: 58 pulse repetition frequency: 2137 Hz ELECTROJET MODE Mode for electrojet detection between 95 and 105 km. Same parameters as above but only 3 beams used. Radar operated since 25 April 2006; end of observation in September 2007 [25april06 05mayl06: OK] [09may06 08aug06: OK with 3dB loss] [08aug06 now: OK] [days with VHF off: may; July; august; September] October April May 8 August ok ok 3 db loss ok amma conf 6-10 nov 06 16
17 Djougou Bénin (CNRM) VHF wind profiler Observation overview amma conf 6-10 nov 06 17
18 Djougou Bénin (CNRM) VHF wind profiler Exemple of observation A Period during the Dry Season (25 April 15 May 2006) amma conf 6-10 nov 06 18
19 Djougou Bénin (CNRM) VHF wind profiler Exemple of observation A Period during the Rainy Season (01 June 22 June 2006) amma conf 6-10 nov 06 19
20 Sodar data for AMMA SOP1 and SOP2 Doug Parker, University of Leeds amma conf 6-10 nov 06 20
21 Locations amma conf 6-10 nov 06 21
22 1000m 13 July 3 sodars! ATR flight Growing mixed layer Backscatter 0m Al Kama Banizoumbou Koure Sud Wind speed 24h Nocturnal jet Surface wind maximum, ~ 1000 UTC amma conf 6-10 nov 06 22
23 Technical problems No network was sustained, due to technical failures. Loss of battery charge commonly led to a gap in data around UTC Good data from individual stations: 31 May 7 June (not 5 June) 8 July 16 August amma conf 6-10 nov 06 23
24 ANNEXE Easterly Waves Observed with the VHF Wind Profiler amma conf 6-10 nov 06 24
25 Periodicity Detection 15 May 15 July Height: 4 KM agl 15 May 15 July Height: 4 KM agl amma conf 6-10 nov 06 25
26 Focus on a Period with Easterly waves amma conf 6-10 nov 06 26
27 Focus on a Period with Easterly waves amma conf 6-10 nov 06 27
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