SEARCH

SEARCH BY CITATION

Keywords:

  • first guess at appropriate time;
  • variational data assimilation

Abstract

The analysis-error variance of a 3D-FGAT assimilation is examined analytically using a simple scalar equation. It is shown that the analysis-error variance may be greater than the error variances of the inputs. The results are illustrated numerically with a scalar example and a shallow-water model. Copyright © 2010 Royal Meteorological Society