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Complex terrain study using TODWL data

Complex terrain study using TODWL data. Emmitt (SWA) de Wekker and Godwin (SWA/UVa) DWL WG Meeting 24 – 26 August 2010 Bar Harbor, Me. Outline. Objectives of ARL funded research Demonstrate the utility of airborne DWL to investigate complex terrain circulations with conical scanning

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Complex terrain study using TODWL data

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  1. Complex terrain study using TODWL data Emmitt (SWA) de Wekker and Godwin (SWA/UVa) DWL WG Meeting 24 – 26 August 2010 Bar Harbor, Me

  2. Outline • Objectives of ARL funded research • Demonstrate the utility of airborne DWL to investigate complex terrain circulations with conical scanning • Develope code to extract winds down to the surface (lowest 50 meters) in complex terrain • Study valley circulations and their interactions with the large scale flow • Study flushing and venting of aerosols and gases within a ridge and valley system • Background on TODWL flights • Examples of results

  3. Twin Otter Doppler Wind Lidar (TODWL) • Series of flights between 2002 and 2007 • Focused upon developing understanding of PBL wind and aerosol variability impact on space-based DWL data products. • In five cases, we collected data along long flight legs across the ridge and valley complex south of Monterey, CA. • Used LADSA (developed by SWA for NPOESS) to fine tune laser beam pointing knowledge precision

  4. LADSA Scans near Salinas Valley on 12 November 2007

  5. Monterey Bay Leg 5 Leg 4 Leg 3 Leg 1 Leg 2 November 12, 2007

  6. Summary • The use of LADSA (Lidar Attitude Determination and Solution Adjustment) algorithm improves precision of DWL LOS measurement to < .1 m/s on average (.2 stdev) • Once corrected with LADSA detailed circulations within the complex terrain of the Monterey Peninsula are resolved. • The use of land LADSA scans appear to be useful for over water observations where surface motions can not be assumed tom be 0,0,0.

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