How To Use A Karlsruhe Doppler Lidar
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1 Andreas Wieser Institut für Meteorologie und Klimaforschung Forschungsbereich Troposphäre (IMK-TRO) First measurements with the new Karlsruhe Doppler Lidar
2 June 03, 2004 Forschungszentrum Karlsruhe we became lidar enthusiasts 2
3 Installation Site Lidar E, N, 110 m 200 m Tower Radar 3
4 Lidar System CLR Photonics Wind Tracer 2 µm Doppler-Lidar Laser: Wavelength Pulse energy Pulse width Pulse repetition frequency Receiver: Bandwidth: Sampling frequency Resolution Scanner: Beam diameter MAG 1A Transceiver µm (eye save) 2 mj 425 ns 500 Hz 50 / 100 MHz 100 MHz 8 bit 8 cm Azimuth (range, step, speed) 360, 0.01, 25 s -1 Elevation , 0.01, 25 s -1 Output: Range gates 120 Range (min, max) 400 m, >8500 m Range resolution m Velocity range: ±20 / ±40 m s -1 Velocity resolution 0.6 m s -1 Update frequency (LOS) 10 Hz 4
5 System Control Windows 2000 GUI for complete system control and data visualization local or remote 5
6 6 Forschungszentrum Karlsruhe Intercomparison Measurements July 02 10, 2004 Lidar different scan strategies, continuous Tethered balloon only July , up to 600 m Sodar continuous, up to 600 m 200 m tower continuous, 20 Hz for July anemometers at 2, 20, 30, 40, 50,60, 80, 100, 130, 160, and 200 m Wind profiler continuous Radiosondes only July 06-07, 9:00am to 9:00pm every 1.5 hours at Bruchsal
7 Measurements during Cloudy Conditions 7
8 Measurements during Convective Conditions Morning conditions with starting convection Fully developed convection in the afternoon 8
9 Vertical Wind Speed at Night 9
10 High Wind Speed Conditions June 23,
11 To do Extend ASU-Matlab scripts to get access to the measurement data, implement post-processing routines and create usable graphical output Combine radar- and lidar data to get 3-D wind field around and within convective clouds Investigate wind field, turbulence structure and boundary layer features for blue sky and cloudy conditions Combine high frequency wind data from Karlsruhe Doppler-lidar with DIAL and/or Raman water vapor data to calculate profiles of turbulent fluxes Do measurements for aerosol propagation to compare with modeling results Try to calculate horizontal wind vector by tracking structures in the wind field 11
12 Future Projects 1 st Lidar deployment June August
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