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

500hPa zonal wind RMS error (2% adaptive obs)

3D-Var

LETKF

ÿWith fewer (2%) adaptive observations, ensemble spread sampling strategy outperforms the other methods in LETKF

ÿFor 3D-Var 2% adaptive observations are clearly not enough

Rawinsonde; climatology; uniform; random; ensemble spread; “ideal”; 100%