Deutscher Wetterdienst
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1 Deutscher Wetterdienst Comparison of wind profiler radar measurements with Doppler wind lidar profiles measurements at the Lindenberg GRUAN site Bernd Stiller, Ronny Leinweber, Volker Lehmann DWD - Deutscher Wetterdienst Meteorologisches Obseratorium Lindenberg Germany Ronny.Leinweber@dwd.de
2 Outline Motiation Radar wind profiler (RWP - technical specification Doppler wind lidars - technical specifications Comparison Doppler wind lidars s. RWP, Radiosonde (RS and COSMO-EU NWP model Campaign setup Results Conclusions
3 Motiation Since years commercial Doppler wind lidars aailable at the market proiding ertical profiles in of the horizontal wind the boundary layer at high temporal and ertical resolution Questions: What potential do Doppler lidars hae for operational wind profile measurements? Can wind lidars complement / replace existing instruments? For ealuation of Doppler wind lidars a comparison with (a well-established radar wind profiler was done
4 Radar wind profiler (DWD WP-Lindenberg: Frequency: 8 MHz WMO No.: 9 Latitude: 5, N Longitude:, E Height: m Vertical resolution: Range: 5 m for low mode - Pulse width: ns m for high mode - Pulse width: 75ns 5 m to 9 km for low mode, 9 range gates km to,5 km for high mode, range gates Beam angle: 5, Aeraging period: 7 minutes for wind, minutes for RASS Horizontal wind ector: Doppler beam swinging ( beams
5 Calculation of horizontal wind field r r rn r r r r n n n n n w u T T sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( For (horizontally homogeneous wind field :
6 Calculation of horizontal wind field r r rn r r r r n n n n n w u T T sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( sin( For (horizontally homogeneous wind field : r T T U V V U : singular alue decomposition of
7 Doppler wind lidars Type Streamline Lidar Windcube WLS 7/ Windcube WLS S Manufactured by HALO photonics Leosphere Leosphere Proided by Karlsruhe Institute of Technology (KIT GWU-Umwelttechnik GmbH Leosphere Waelength,5 µm,5 µm,55 µm Max. range km km / km km Beam configuration scanner Four fixed beams scanner Scan modes stare, VAD, DBS --- stare, VAD, DBS
8 Campaign setup March April May June July Aug Sep Oct No Dec Jan Stream Line Lidar WLS WLS Data aailability: >98% <7% WLS 7 WLS S Problems: Leosphere - Insufficient air conditioning in early summer All three Lidars aailable in December with good data quality ( weeks Comparison for period 9. No. -. Dec. (red markers
9 Campaign setup Three different Doppler Lidars next to LIN 8 MHz wind profiler Data aailability for all lidars good for a period of weeks ( Comparison Doppler wind lidar against: Radar wind profiler (RWP Radiosondes (RS NWP: DWD COSMO-EU model output Temporal and ertical resolution (wind speed/direction: RWP 7min / 5m WLS min / 5m WLS S min / 5m StreamLine min / 5m RS h / -m COSMO-EU h (UTC and UTC forecast / ~m all datasets were interpolated to the ertical resolution (5m and aeraged to temporal resolution (7min of the radar wind profiler
10 Results - profiles Radar wind profiler COSMO EU Radiosonde StreamLine 5 Wind speed [m/s].. : 7: UTC
11 Results - profiles Radar wind profiler COSMO EU Radiosonde WLS s 5 Wind speed [m/s].. : 7: UTC
12 Results - profiles Radar wind profiler COSMO EU Radiosonde WLS 5 Wind speed [m/s].. : 7: UTC
13 Results - time series Wind speed [m/s] 5 5 Radar wind profiler COSMO EU Radiosonde StreamLine Wind speed [m/s] 5 5 Radar wind profiler COSMO EU Radiosonde WLS s 5 5 : : : 8: : Time UTC 5 Wind speed [m/s] 5 Radar wind profiler COSMO EU Radiosonde WLS : : : 8: : Time UTC 5.., Altitude: 55m : : : 8: : Time UTC
14 Results - StreamLine StreamLine Windprofiler StreamLine Radiosonde StreamLine COSMO-EU StreamLine Windprofiler StreamLine Radiosonde StreamLine COSMO-EU alid cases: % Difference in wind speeds [m/s] Difference in wind direction [deg] -Period ( weeks -Differences in WD < ; WS <.5m/s to RWP
15 Results - WLS s WLS s Windprofiler WLS s Radiosonde WLS s COSMO-EU WLS s Windprofiler WLS s Radiosonde WLS s COSMO-EU alid cases: % 5 5 Difference in wind speeds [m/s] Difference in wind direction [deg] -Period ( weeks -Differences in WD <. ; WS <.5m/s to RWP
16 Results - WLS WLS Windprofiler WLS Radiosonde WLS COSMO-EU WLS Windprofiler WLS Radiosonde WLS COSMO-EU alid cases: % Difference in wind speeds [m/s] Difference in wind direction [deg] -Period ( weeks -Differences in WD <. ; WS <.5m/s to RWP
17 Results StreamLine Windprofiler StreamLine Radiosonde StreamLine COSMO-EU WLS Windprofiler WLS Radiosonde WLS COSMO-EU alid cases: alid cases: % Difference in wind speeds [m/s] % Difference in wind speeds [m/s] alid cases: WLS s Windprofiler WLS s Radiosonde WLS s COSMO-EU % 5 5 Difference in wind speeds [m/s]
18 Results StreamLine Windprofiler StreamLine Radiosonde StreamLine COSMO-EU WLS Windprofiler WLS Radiosonde WLS COSMO-EU alid cases: alid cases: % Difference in wind speeds [m/s] % Difference in wind speeds [m/s] alid cases: WLS s Windprofiler WLS s Radiosonde WLS s COSMO-EU % 5 5 Difference in wind speeds [m/s]
19 Radar influenced by ground clutter in the lowest heights
20 Conclusion All Doppler wind lidars are in a good agreement with the radar wind profiler for a period of weeks differences in wind speed of.5m/s were obsered differences of were obsered for wind direction IMPORTANT: accurate alignment of lidar is required!! Large differences occur at the lowermost and uppermost altitude leels (ground clutter in RWP measurements / weak CNR Data aailability of wind lidars more than 9% up to 5 m complement the wind profile retrieed by (UHF radar wind profilers Doppler wind lidars are promising instruments for operational and scientific wind measurements in the boundary layer
21 Thank You!
22 Results - profiles Radar wind profiler COSMO EU Radiosonde StreamLine Radar wind profiler COSMO EU Radiosonde WLS Wind speed [m/s] 5 5 Wind speed [m/s] Radar wind profiler COSMO EU Radiosonde WLS s.. : 7: UTC 5 Wind speed [m/s]
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