data assimilation 12 Research & information: general 9 History of engineering and technology 8 Data assimilation 7 Applied mathematics 6 Technology: general issues 5 Forecasting 4 Geography 4 Boundary conditions 3 Climate change 3 Inverse problems 3 Mathematical physics 3 Coarse grid 2 Cost functions 2 Cost-function 2 Data assimilation techniques 2 Decomposition approach 2 Digital storage 2 Discretizations 2 Domain decomposition methods 2 Ensemble Kalman filtering 2 Equations of motion 2 Fine-scale 2 Flow fields 2 Grid approximations 2 Initial conditions 2 Inner domain 2 Iterative methods 2 Kalman filters 2 Land surface 2