The Twin Otter Doppler Wind Lidar (TODWL) uses a pulsed 2-ƒÝm solid-state laser transmitter, coherent heterodyne detection, and a two-axis scanner, mounted on the Navy CIRPAS Twin Otter aircraft. Basic TODWL data products include simultaneous collocated range-gated measurements of aerosol backscatter and radial velocity along a given line of sight (LOS) during a given scan. Typical scanning patterns include forward stares, nadir stares, and conical step-stare scans. During Winter 2002 and 2003, the TODWL flew ~30 hours on 8 sorties within and above the marine boundary layer (MBL) over Monterey Bay and the open ocean off the California coast. These sorties provided detailed information on the spatiotemporal variability and covariance of aerosols and the velocity fields that transport them. The high spatial resolution and high volume-sampling rate of the TODWL were especially useful for studying the effects of organized large eddies on aerosol variability within the MBL.