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Current Lidar Activities at ETL

This overview discusses the current lidar activities at ETL, including fine structures of moisture transport, lidar upgrades, and deployments for field experiments. It also highlights the NOAA G-4 Doppler lidar and various working group projects.

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Current Lidar Activities at ETL

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  1. Current Lidar Activities at ETL Mike Hardesty and Alan Brewer NOAA Environmental Technology Laboratory Working Group on Spacebased Lidar Winds

  2. Overview of Topics • Fine structures of moisture transport measured during IHOP • Lidar upgrades and deployments for current field experiments • NOAA G-4 Doppler lidar Working Group on Spacebased Lidar Winds

  3. IHOP Horizontal Winds: 9 June 270 km Forecast showed low level jet Flight track to measure jet Working Group on Spacebased Lidar Winds

  4. Northern leg wind and water vapor Working Group on Spacebased Lidar Winds

  5. Lidar and dropsonde flux comparison DIAL/Doppler lidar Dropsonde (~50 km spacing) Working Group on Spacebased Lidar Winds

  6. Fine Scale Transport 1809 m ASL Working Group on Spacebased Lidar Winds

  7. Fine Scale Transport 2309 m ASL Working Group on Spacebased Lidar Winds

  8. Fine Scale Transport 2589 m ASL Working Group on Spacebased Lidar Winds

  9. Average Moisture flux versus height Working Group on Spacebased Lidar Winds

  10. Northern Leg vq Cospectrum 150 km 15 km Working Group on Spacebased Lidar Winds

  11. Current Lidar Activities • New England Air Quality (ship) • Wind profiler and Doppler lidar to characterize winds down to the surface • Cloud radar/radiometer to measure cloud properties • Aerosol/ozone lidar to detect layering • Air/sea flux measurements • New England Air Quality (plane) • Airborne ozone/aerosol lidar • Dropsondes • Key West Air Sea Interaction study • MOPA CO2 Doppler lidar on Navy ship Working Group on Spacebased Lidar Winds

  12. High Resolution lidar 2003/2004 Upgrades • Reconfigured optical system to incorporate a fiber coupled receiver detector. • Implemented a PZT controlled variable coupler to regulate amount of LO power mixing with return signal. • Simplified transmit/receive paths. • Completely re-designed receiver detector circuitry to be compatible with fiber receiver. • Frequency monitor information now extracted from receiver detector signal. • Implemented an improved Pound-Drever/Hall circuit board (for locking cavity to seed light). • Developed &implemented new motion-compensation control algorithms. • Correction to 0.3 degree rms • Fully removes linear velocities Working Group on Spacebased Lidar Winds

  13. MOPA CO2 Doppler Upgrades • Implemented C12O18 isotope • Resonances in backscatter for some sulfates • Eliminates CO2 absorption • Reduced H2O continuum absorption • Two identical master oscillator paths for DIAL measurements • Range has doubled, often to 15 km with 1.3 mJ Working Group on Spacebased Lidar Winds

  14. NOAA G-IV Instrumentation Upgrades Contact Point: Alan S. Goldstein – NOAA/Aircraft Operations Center Working Group on Spacebased Lidar Winds

  15. Mission Needs • The next generation of NWS numerical prediction models is the Weather Research and Forecasting (WRF) system. The WRF for hurricanes (HWRF) will be an advanced modeling system to forecast track, intensity and rainfall. • NWS held a workshop in May 2002 to identify data required by HWRF. The results of this workshop were used to generate a preliminary instrumentation and modification plan. • Discussions with NCEP/Environmental Modeling Center, NCEP/National Hurricane Center and OS/Operations and Requirements Division have refined the measurement requirements and corresponding instrumentation proposal. 15 Working Group on Spacebased Lidar Winds

  16. HWRF Workshop List • 3D Winds – Critical for Model Initialization • Ocean Temperature and Heat Content * • Vertical Temperature Profiles • Vertical Moisture Profiles • Ocean Waves * • Microphysics/Rain • Ocean Currents • Radiation * Supports current NHC forecasting _ | For Model | Verification | (May be needed _| for initialization) | | For Model | Verification | _| 16 Working Group on Spacebased Lidar Winds

  17. Look angles and wind products Working Group on Spacebased Lidar Winds

  18. 2-d Winds in each plane Mean Wind Working Group on Spacebased Lidar Winds

  19. Components • Laser • Diode pumped tripled Nd:YAG • Receiver • Direct detection • Heat Rejection  • Cooling Loop to external radiator • Telescope/Scanner • HOE scanner (Schwemmer) • Integration/Products • NOAA/ETL Working Group on Spacebased Lidar Winds

  20. Interior view Working Group on Spacebased Lidar Winds

  21. Expected Performance Working Group on Spacebased Lidar Winds

  22. Timeline • April 04 • Paperwork into purchasing • NASA MOU paperwork into system • Sep 04 – Orders placed • July – Sept 05 Delivery of major components • Sept – Nov 05 Assemble Lidar system • Nov 05 - Lab testing entire system • Dec 05 - Initial upload of Lidar into G4 • Winter Storm Season 06 - testing Lidar systems • Hurricane Season 06 – Initial deployment G4 Doppler Lidar Working Group on Spacebased Lidar Winds

  23. What’s next • IHOP • Compare observed transport with model estimates • Complete investigation of vertical velocity fluctuations • Solid state Doppler lidar • Tropical cumulus experiment (NOAA ship) 2005 • Fly on NOAA Twin Otter (2005) • Co-deploy with airborne ozone lidar in Texas (2006) • Dual wavelength CO2 MOPA lidar • DIAL experiments to measure hydrocarbons Working Group on Spacebased Lidar Winds

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