Multi-scale

4-4 January 21 17:20-17:40

How does DA address scale interactions in truncated models?

Javier Amezcua (University of Reading, UK National Centre for Earth Observation) Peter Jan van Leeuwen (University of Reading, Colorado State University)

Abstract

Physical phenomena often include processes with different scales both in space and time. These processes are captured differently (or not at all) by models and observations. We provide a simple analysis for a linear two-scale problem with a fast and a slow component. We show how the interactions can lead to three elements in the slow scale: direct, memory and noise (simple and complex). We discuss how these elements are addressed in sequential DA and provide some ideas of how to improve this treatment.

Contact information

Dr. Javier Amezcua University of Reading