ADM-Aeolus Doppler wind lidar Observing System Simulation Experiment

Within the Atmospheric Dynamics Mission Aeolus (ADM-Aeolus) the European Space Agency (ESA) has approved a Doppler Wind Lidar (DWL) to fly on a dedicated platform orbiting dawn-dusk at 400~km altitude, planned for launch in 2008. Rigorous design trade-offs have resulted in a lidar concept capable of delivering high-quality wind component profiles, but with a limited coverage. A companion paper describes the realistic simulation of this DWL, whereas this paper sets out to assess the impact of such lidar in meteorological analyses and forecasts. To this end an Observing System Simulation Experiment (OSSE) is run. The superior conventional observation coverage of 1993 is used to simulate all conventional observations, whereas, on the other hand, a limited set of satellite observations is simulated. As a consequence, only the northern hemisphere DWL impact in the OSSE is assumed realistic. Here, in a 15-day period with variable weather, out of 15 daily forecasts, 14 show beneficial impact of the DWL. Although the experiment is limited, it corroborates other practical and theoretical evidence that the ADM DWL will demonstrate a beneficial impact in meteorological analyses and forecasts.