This is a near real-time demonstration of the JEDI H(X) application, which simulates observations from a forecast model background state in correspondence with actual observations.
Computing H(X) is the first step in assimilating observation data into a forecast system. JEDI supports the end-to-end process of data assimilation, through unified forward operators (UFO), an interface for observation data access (IODA), variational solvers from the object oriented prediction system (OOPS), and system-agnostic background error representation (SABER).
Observations are processed in 6-hr windows beginning at 0300Z, 0900Z, 1500Z, and 2100Z. JEDI drives the GEOS forecast model to produce in-core, four-dimensional estimates of H(X), or 4D H(X), roughly three to six hours behind real-time.
Observation Data Sources
All observations come from GEOS post-processed diagnostic files, which are converted to IODA format for use in the JEDI H(X) application.