Loading...
Empirical correction of a toy climate model
Allgaier, Nicholas A. Harris, Kameron D. Danforth, Christopher M.
Allgaier, Nicholas A.
Harris, Kameron D.
Danforth, Christopher M.
Citations
Altmetric:
License
http://rightsstatements.org/vocab/InC/1.0/
License
DOI
10.1103/PhysRevE.85.026201
Abstract
Improving the accuracy of forecast models for physical systems such as the atmosphere is a crucial ongoing effort. The primary focus of recent research on these highly nonlinear systems has been errors in state estimation, but as that error has been successfully diminished, the role of model error in forecast uncertainty has duly increased. The present study is an investigation of an empirical model correction procedure involving the comparison of short forecasts with a reference "truth" system during a training period, in order to calculate systematic (1) state-independent model bias and (2) state-dependent error patterns. An estimate of the likelihood of the latter error component is computed from the current state at every time step of model integration. The effectiveness of this technique is explored in a realistic scenario, in which the model is structurally different (in dynamics, dimension, and parametrization) from the target system. Results suggest that the correction procedure is more effective for reducing error and prolonging forecast usefulness than parameter tuning. However, the cost of this increase in average forecast accuracy is the creation of substantial qualitative differences between the dynamics of the corrected model and the true system. A method to mitigate dynamical ramifications and further increase forecast accuracy is presented. © 2012 American Physical Society.
Description
Date
2012-02-02
Journal Title
Journal ISSN
Volume Title
Publisher
Files
Loading...
Danforth2012.pdf
Adobe PDF, 2.46 MB
Research Projects
Organizational Units
Journal Issue
Citation
Allgaier NA, Harris KD, Danforth CM. Empirical correction of a toy climate model. Physical Review E. 2012 Feb 2;85(2):026201.