PowerPoint Presentation - COMPARISON OF ENSEMBLE-BASED AND VARIATIONAL-BASED DATA ASSIMILATION SCHEMES IN A QUASI-GEOSTROPHIC MODEL

Adaptive sampling with the LETKF-based ensemble spread
Junjie Liu

•Purpose

–Sample 10% adaptive DWL wind observations to get 90% improvement of full coverage

–Compare ensemble spread method with other sampling strategies

–How the results are sensitive to the data assimilation schemes (3D-Var and LETKF)

•Note

–same adaptive observations from ensemble spread method are assimilated by both 3D-Var and LETKF