Continuous Data Assimilation Modes JEDI

In operational settings, useful observations valid in a given data assimilation (DA) window may arrive after a data assimilation cycle has begun leading to a loss of potentially important information in the assimilation step. Continuous DA allows us to avoid that information loss by adding newly arrived observations between outer loops. JCSDA is developing three new continuous DA modes for the JEDI system. In the first any newly arrived observations are added before beginning the next outer loop. The second also adds newly arrived observations but allows for a shift forward of the end of the DA window. And finally, the third adds newly arrived observations while shifting both the beginning and the end of the DA window between outer loops. The genericity of JEDI extends these abilities to any model with a JEDI interface. In this talk I will present the implementation of these new modes and present initial results on how they affect DA when cycling.