Approved For Public Release Distribution Unlimited Diagnostic Wind

Approved For Public Release; Distribution Unlimited Diagnostic Wind Model Initialization Using the Airborne Doppler Wind lidar Data Yansen Wang 1, Chatt Williamson 1, David Emmitt 2, and Steve Greco 2 1 U. S. Army Research Laboratory 2 Simpson Weather Associates AMS 4 th Symposium on Lidar Atmospheric Application Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited Brief 3 DWF Model Description • Given a limited number of observations or coarsely modeled wind field in a complex terrain, the wind field is physically interpolated in such way that the mass conservation is satisfied. Mathematically, to Minimize the following functional (Sasaki, 1970; Sherman 1978): é ¶ ¶ ¶ ù u v w 2 0 2 + E (u , v , w , l ) = ò ê b 1 ( u - u ) + b 1 ( v - v ) + b 2 ( w - w ) + l ( + ) úd. V ¶ ¶ ¶ x y z û Vë . Very accurate boundary treatment, structured Cartesian grids. • • • Bi-CGSTAB numerical and multigrid numerical solvers. Building and steep topographic wake parameterizations. Lidar data assimilation/initialization. Vegetation canopy flow parameterization. Validation and improvement with observation data sets. Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited Simulstion in Complex Terrain 3 DWF Askervein Hill Simulation Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited 3 DWF wind field at 10 m AGL A B AA Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited Comparison of model results with observations at Askervein Hill Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited 3 DWF model simulation wind field at Salinas Valley initialized by the airborne Doppler lidar data Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited Airborne Doppler Wind Lidar Aircraft Platform Optical Particle Counters PCASP 0. 1 -3. 0 m NPS CIRPAS Twin Otter Naval Postgraduate School Center for Interdisciplinary Remotely-piloted Aircraft Studies TODWL Instrument 2. 0125 µm, coherent detection CAPS 0. 45 -118 m FSSP 2. 5 -51 m TODWL Scanner 2 m. J, 330 nsec (FWHM), 500 Hz 10 cm telescope two axis scanner, 30 & 120 deg, side door mount Weight: 425 lb Power: 1. 5 KW ~7 -10% total system efficiency Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited TODWL vs. Ft. Ord microwave sounder TODWL Flight Level Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited TODWL Flight Patterns Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited TODWL OBSERVATIONS Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited 3 DWF wind field at 10 m AGL Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited Zoom in a small area Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited Comparison with NWS observations Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited Summary • New 3 DWF model performed well in a simple low hill with strong wind condition. • Airborne Doppler lidar data can be used for the 3 DWF initialization with an objective analysis method. • The complex Salinas valley case with lidar data initialization gives reasonably good results. Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited TODWL Characteristics Approved For Public Release; Distribution Unlimited

Approved For Public Release; Distribution Unlimited 0030 UTC 13 March 2002 TODWL sounding looking up (20 seconds) Aircraft flight level Microwave sounding Ft Ord (30 minutes) Approved For Public Release; Distribution Unlimited TODWL sounding looking down (20 sec)