@inbook{81624,
  author = {ECMWF},
  title = {IFS Documentation CY49R1 - Part II: Data Assimilation},
  abstract = {Chapter 1 Overview<br />
Chapter 2 4D variational assimilation<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 sea-ice concentration and SST<br />
Chapter 11 Data flow},
  year = {2024},
  journal = {IFS Documentation CY49R1},
  chapter = {2},
  month = {11/2024},
  publisher = {ECMWF},
  url = {&nbsp;},
  doi = {10.21957/105cb1333c},
}