Facilitating Strongly Coupled Ocean-Atmosphere Data Assimilation with an Interface Solver
Sergey Frolov, Craig H Bishop, Teddy Holt, James Cummings, David Kuhl
MONTHLY WEATHER REVIEW | AMER METEOROLOGICAL SOC | Published : 2016
In a strongly coupled data assimilation (DA), a cross-fluid covariance is specified that allows measurements from a coupled fluid (e.g., atmosphere) to directly impact analysis increments in a target fluid (e.g., ocean). The exhaustive solution to this coupled DA problem calls for a covariance where all available measurements can influence all grid points in all fluids. Solution of such a large algebraic problem is computationally expensive, often calls for a substantial rewrite of existing fluid-specific DA systems, and, as shown in this paper, can be avoided. The proposed interface solver assumes that covariances between coupled measurements and target fluid are often close to null (e.g., ..View full abstract
Awarded by Office of Naval Research
This work was supported by the Office of Naval Research Award N0001412WX20323. We are grateful to Keith Sashegyi formally of NRL-MRY for his support with the atmospheric 3DVAR software.