TY - ECHAP
AU - ECMWF
AB - Chapter 1 Overview: the observation world<br />
Chapter 2 4D Variational assimilation&nbsp;<br />
Chapter 3 Tangent linear physics<br />
Chapter 4 Background terms<br />
Chapter 5 Observation-related processing (Jo)<br />
Chapter 6 Background errors<br />
Chapter 7 Gravity Wave Control<br />
Chapter 8 Diagnostics<br />
Chapter 9 Land-surface analysis<br />
Chapter 10 Analysis of ocean and sea-ice<br />
Chapter 11 Data flow
BT - IFS Documentation CY50R1
DA - 06/2026
DO - 10.21957/a77acfeae9
N2 - Chapter 1 Overview: the observation world<br />
Chapter 2 4D Variational assimilation&nbsp;<br />
Chapter 3 Tangent linear physics<br />
Chapter 4 Background terms<br />
Chapter 5 Observation-related processing (Jo)<br />
Chapter 6 Background errors<br />
Chapter 7 Gravity Wave Control<br />
Chapter 8 Diagnostics<br />
Chapter 9 Land-surface analysis<br />
Chapter 10 Analysis of ocean and sea-ice<br />
Chapter 11 Data flow
PB - ECMWF
PY - 2026
SE - 2
T2 - IFS Documentation CY50R1
T3 - IFS Documentation
TI - IFS Documentation CY50R1 - Part 2: Data Assimilation 
UR - &nbsp;
ER -