Extended Abstract (740K)7.2
Diagnostic Wind Model Initialization Using Airborne Doppler Wind Lidar Data
Yansen Wang, U.S. Army Research Laboratory, Adelphi, MD; and C. Williamson, D. Emmitt, and S. Greco
The accuracy of a diagnostic wind model, such as ARL's 3-Dimensional Wind Field (3DWF) model, is closely related to its initial data accuracy and spatial density. Since 2003, a Doppler Wind Lidar has been flown on a Navy Twin Otter in a series of studies of the atmospheric boundary layer. The wind profiles were retrieved from a downward conical scan with 30 degree azimuth intervals using a volume velocity processing method. Each profile was taken within a 30 second time window yielding a complete u,v,w profile each 1.5 km from the surface to 2500 meters with a vertical resolution of 50 meters. We have developed an objective analysis algorithm to grid the airborne Doppler wind lidar observed wind profiles in a complex terrain. The gridded data is used to initialize an improved version of 3DWF model. A sensitivity analysis was carried out to determine the least number of wind profiles required to give a reasonably accurate wind field for the testing site.
Session 7, The Use of Lidar Measurements in Model Evaluation and Assimilation
Wednesday, 14 January 2009, 10:30 AM-12:00 PM, Room 122A
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