Validation of meso-scale model winds in complex terrain and coastal regions using an airborne coherent Doppler wind lidar G. D. Emmitt, S. Greco, S. Wood.

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Presentation transcript:

Validation of meso-scale model winds in complex terrain and coastal regions using an airborne coherent Doppler wind lidar G. D. Emmitt, S. Greco, S. Wood and C. OHandley Simpson Weather Associates W. Nuss and D. Miller Navy Postgraduate School ISTP, Leipzig 2003

MM5 validation* Working with Nuss and Miller at NPS TODWL collected ~3000 profiles over a period of 4 hours with 50 m vertical resolution, ~ 600 m horizontal resolution and ~.05 m/s accuracy (over cycloid) Initial comparisons with 12 km MM5 runs * and demonstration of TODWL support of prescription burning at Ft Ord

NPS MM5 Run twice daily at the Naval Postgraduate School 30 vertical levels, 12 at or below 850 mb level Triple nest (108, 36, and 12 km); 4 km nest special run for this case Warm start (initial conditions generated blending 12-h MM5 forecast with observations) MRF PBL scheme

Series of TODWL profiles Profiles taken along transect of California coast (flying west to east) near Point Sur. Profiles of wind speed, direction, vertical velocity,signal intensity and turbulence (within the illuminated volume) Brown shading indicates land topography Numbers (e.g. 97, 98..) reference the profiles identity tag.

The following six slides are examples of comparisons between the TODWL soundings and the MM5 soundings within 5 minutes and 2 km of the TODWL soundings

Summary The TODWL soundings have been processed to obtain accuracies of <.10 m/s in each component (u,v,w). Comparisons with other sounders must be interpreted with caution since integration times and sample volumes are different. Comparisons with model predictions suggest a significant effort is needed to understand the differences.