Simulation and impact study of future spaceborne Doppler wind lidar in Japan

Spaceborne Doppler Wind Lidars (DWLs) can provide global wind profile observations, being significantly beneficial for the improvement of numerical weather prediction. Coherent DWLs have been developed by NICT for a decade and feasibility study of spaceborne DWL has recently begun among Japanese science community. To assess the impact of the DWL, we have been developing the Integrated Satellite Observation SIMulator for a spaceborne coherent Doppler lidar (ISOSIM-L) at the Communication Research Laboratory (CRL, now NICT) and Observing System Simulation Experiment (OSSE) system at JMA/MRI.

The ISOSIM-L simulates backscattered power, background noise power, signal-to-noise ratio, wind speed and direction and their accuracy. Quasi-truth atmospheric field, which is an input of ISOSIM-L, is generated based on the Sensitivity Observing System Experiment (SOSE) approach. Aerosol consistent with quasi-truth wind is provided by the global aerosol model of MRI. Simulated line-of-sight wind speeds are assimilated with the four-dimensional variational (4D-Var) scheme based on the global operational assimilation system at JMA.

The preliminary results will be presented at the meeting.