This session will focus on data assimilation techniques which are developed or implemented in meteorology, oceanography and land-surface modelling, and on observation impact.

This session will accept papers on any aspect of data assimilation, including (but not limited to) algorithmic developments in variational or ensemble methods; novel nonlinear data assimilation methods; model, background or observation uncertainty estimation and modelling; coupled data assimilation; observation impacts; targeting strategies and observation network design; innovative observing systems.

The session will include an invited talk on a topic in land surface data assimilation.