@inbook{77028,
  author = {ECMWF and P. White},
  title = {IFS Documentation CY23R4 - Part II: Data Assimilation},
  abstract = {<p>
  Chapter 1 ‘Incremental formulation of 3D/4D variational assimilation—an overview<br>Chapter 2 ‘3D variational assimilation<br>Chapter 3 ‘4D variational assimilation<br>Chapter 4 ‘Background term'<br>Chapter 5 ‘Conventional observational constraints'<br>Chapter 6 ‘Satellite observational constraints'<br>Chapter 7 ‘Background, analysis and forecast errors<br>Chapter 8 ‘Gravity-wave control<br>Chapter 9 ‘Data partitioning (OBSORT)<br>Chapter 10 ‘Observation screening<br>Chapter 11 ‘Analysis of snow<br>Chapter 12 ‘Land surface analysis<br>Chapter 13 ‘Sea surface temperature and sea-ice analysis<br>Chapter 14 ‘Reduced-rank Kalman filter<br>REFERENCES</p>
},
  year = {2003},
  journal = {IFS Documentation CY23R4},
  number = {2},
  month = {09/2003},
  publisher = {ECMWF},
  url = {https://www.ecmwf.int/node/13271},
  doi = {10.21957/b7ejzfs7e},
  language = {eng},
}