Using SVD-En3DVar for Radar Data Assimilation: Comparing Local and Global Schemes

A local scheme is introduced into the Ensemble-based 3DVar approach with SVD and is used to assimilate simulated radar observation with WRF model. Local and global schemes are compared and the sensitivities to the localization parameters are investigated. The experiments show that localization can improve the skill of analysis and forecast by avoiding spurious analysis increment in the vacant area of observation. The behave of assimilation is dependent on the localization scale.