IFS Documentation front page

I Observations
II Assimilation
III Dynamics
IV Physics
V Ensemble
VI Technical
VII Waves

Part II: Data assimilation

CHAPTER 2 3D variational assimilation

Table of contents

2.1 Introduction

2.2 Top-level controls

2.2.1 Gradient test

2.2.2 Iterative solution

2.2.3 Last simulation

2.3 A simulation

2.3.1 Interface between control variable and model arrays

2.4 Interpolation to observation points

2.4.1 Method

2.4.2 Storage in GOM-arrays

2.5 Computation of the observation cost function

2.5.1 Organization in observation sets

2.5.2 Cost function

2.5.3 J_o tables

2.5.4 Correlation of observation error

2.6 Variational quality control

2.6.1 Description of the method

2.6.2 Implementation

2.6.3 Correlated data