@inbook{74320,
  author = {ECMWF},
  title = {IFS Documentation CY40R1 - Part II: Data Assimilation},
  abstract = {<p>
  Chapter 1 Overview<br>Chapter 2 4D variational assimilation<br>Chapter 3 Tangent-linear physics<br>Chapter 4 Background term<br>Chapter 5 Observation-related processing (Jo)<br>Chapter 6 Background, analysis and forecast 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 sea surface temperature<br>Chapter 11 Data flow References</p>
},
  year = {2014},
  journal = {IFS Documentation CY40R1},
  number = {2},
  month = {2014},
  publisher = {ECMWF},
  url = {https://www.ecmwf.int/node/9202},
  doi = {10.21957/bnfla0doa},
  note = {<p>
  Operational implementation 22 November 2013</p>
},
  language = {eng},
}