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- W2175066699 abstract "The IAU (incremental analysis updating) process incorporates analysis increments into a model integration in a gradual manner. It does this by using analysis increments as constant forcings in a model's prognostic equations over a 6-h period centered on an analysis time. A linear analysis of the IAU procedure shows it to have the attractive properties of a low-pass time filter. The IAU process affects the response of the model to the analysis increments, and it leaves the model state unaffected where there were no data to assimilate. This result is contrasted with a simple dynamical relaxation (or “nudging”) scheme, which is shown, in this linear analysis, to have less desirable response characteristics, both from the analysis increments and from the background state of the model. The behavior of IAU in the context of the Goddard Earth Observing System (GEOS) Data Assimilation System is examined using a combination of large-scale diagnostics from month-long assimilations and detailed diagnostics from short assimilations. These studies indicate that IAU assimilations have improved observed-minus-forecast statistics and improved globally averaged precipitation by removing spinup effects. The detailed diagnostics of the behavior of the GEOS system with IAU corroborate the results of the linear analysis of the response behavior of IAU." @default.
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- W2175066699 date "1996-06-01" @default.
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- W2175066699 title "Data Assimilation Using Incremental Analysis Updates" @default.
- W2175066699 doi "https://doi.org/10.1175/1520-0493(1996)124<1256:dauiau>2.0.co;2" @default.
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