Turbulence and mountain wave conditions observed with an airborne 2-micron Doppler lidar

Joint efforts by NASA, DOD and industry are enhancing the capability of airborne wind and turbulence detection. The ACLAIM (advanced coherent lidar for airborne measurements) has flown on three series of flights to assess its capability over a range of altitudes, airmass conditions and gust phenomena. Highlights of these experiences are presented. In particular, a case of moderate turbulence induce by mountain wave flow in the lee of the southern Sierra Nevada range is illustrated. Data examples include both forward-looking lidar line-of-sight to see approaching perturbations and upward slanting lines of sight to detect a component of the vertical wind shear.(release approval pending, 5/19/04)