Publication Date:
2014-03-07
Description:
We examine the linearity of the EDA (Ensemble of Data Assimilations) technique with respect to amplitude of the applied observation perturbations. We provide explicit examples to assess a linear relationship between such modifications of the observing system and the resulting changes in the EDA ensemble spread. The results demonstrate that, for a state-of-the-art numerical weather prediction (NWP) system, such linearity between the applied observation perturbations and the EDA ensemble spread holds well for temporal and spatial regimes relevant to global medium-range weather prediction, specifically for forecast lead-times of up to approximately 5 days, and in the vertical throughout the troposphere up to the lower- and middle-stratosphere, and for broad horizontal scales.
Print ISSN:
0035-9009
Electronic ISSN:
1477-870X
Topics:
Geography
,
Physics
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