Comparing Adjoint-and Ensemble-Sensitivity Analysis with Applications to Observation Targeting

@inproceedings{HAKIM2007ComparingAE,
  title={Comparing Adjoint-and Ensemble-Sensitivity Analysis with Applications to Observation Targeting},
  author={GREGORY J. HAKIM},
  year={2007}
}
  • GREGORY J. HAKIM
  • Published 2007
The sensitivity of numerical weather forecasts to small changes in initial conditions is estimated using ensemble samples of analysis and forecast errors. Ensemble sensitivity is defined here by linear regression of analysis errors onto a given forecast metric. We show that ensemble sensitivity is proportional to the projection of the analysis-error covariance onto the adjoint sensitivity field. Furthermore, the ensemble sensitivity approach proposed here involves a small calculation that is… CONTINUE READING
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