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Data assimilation: From photon counts to Earth System forecasts

✍ Scribed by Pierre-Philippe Mathieu; Alan O'Neill

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 933 KB
Volume: 112
Category: Article
ISSN: 0034-4257
DOI: 10.1016/j.rse.2007.02.040

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✦ Synopsis

Data assimilationthe set of techniques whereby information from observing systems and models is combined optimallyis rapidly becoming prominent in endeavours to exploit Earth Observation for Earth sciences, including climate prediction. This paper explains the broad principles of data assimilation, outlining different approaches (optimal interpolation, three-dimensional and four-dimensional variational methods, the Kalman Filter), together with the approximations that are often necessary to make them practicable. After pointing out a variety of benefits of data assimilation, the paper then outlines some practical applications of the exploitation of Earth Observation by data assimilation in the areas of operational oceanography, chemical weather forecasting and carbon cycle modelling. Finally, some challenges for the future are noted.

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