Ensemble-based approximation of observation impact using an observation-based verification metric
- Author(s)
- Matthias Sommer, Martin Weissmann, Martin Weissmann
- Abstract
Knowledge on the contribution of observations to forecast accuracy is crucial for the refinement of observing and data assimilation systems. Several recent publications highlighted the benefits of efficiently approximating this observation impact using adjoint methods or ensembles. This study proposes a modification of an existing method for computing observation impact in an ensemble-based data assimilation and forecasting system and applies the method to a pre-operational, convective-scale regional modelling environment. Instead of the analysis, the modified approach uses observation-based verification metrics to mitigate the effect of correlation between the forecast and its verification norm. Furthermore, a peculiar property in the distribution of individual observation impact values is used to define a reliability indicator for the accuracy of the impact approximation. Applying this method to a 3-day test period shows that a well-defined observation impact value can be approximated for most observation types and the reliability indicator successfully depicts where results are not significant.
- Organisation(s)
- Department of Meteorology and Geophysics
- External organisation(s)
- Hans-Ertel-Zentrum für Wetterforschung, Ludwig-Maximilians-Universität München
- Journal
- Tellus. Series A: Dynamic Meteorology and Oceanography
- Volume
- 68
- ISSN
- 0280-6495
- DOI
- https://doi.org/10.3402/tellusa.v68.27885
- Publication date
- 2016
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105206 Meteorology
- Keywords
- ASJC Scopus subject areas
- Oceanography, Atmospheric Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/ensemblebased-approximation-of-observation-impact-using-an-observationbased-verification-metric(579d2b95-a67e-4a2e-a948-cd953475fcd1).html