controlling instabilities along a 3dvar analysis cycle by assimilating in the unstable subspace: a comparison with the enkf

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ID: 187660
2008
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Abstract
A hybrid scheme obtained by combining 3DVar with the Assimilation in the Unstable Subspace (3DVar-AUS) is tested in a QG model, under perfect model conditions, with a fixed observational network, with and without observational noise. The AUS scheme, originally formulated to assimilate adaptive observations, is used here to assimilate the fixed observations that are found in the region of local maxima of BDAS vectors (Bred vectors subject to assimilation), while the remaining observations are assimilated by 3DVar. The performance of the hybrid scheme is compared with that of 3DVar and of an EnKF. The improvement gained by 3DVar-AUS and the EnKF with respect to 3DVar alone is similar in the present model and observational configuration, while 3DVar-AUS outperforms the EnKF during the forecast stage. The 3DVar-AUS algorithm is easy to implement and the results obtained in the idealized conditions of this study encourage further investigation toward an implementation in more realistic contexts.
Reference Key
carrassi2008nonlinearcontrolling Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;A. Carrassi;A. Trevisan;L. Descamps;O. Talagrand;F. Uboldi
Journal BMC research notes
Year 2008
DOI
DOI not found
URL
http://www.nonlin-processes-geophys.net/15/503/2008/npg-15-503-2008.pdf
Keywords
cosmic physics sciencephysicsgeophysics

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