Overview of the CESM-Dart Ocean-Atmosphere Ensemble Coupled Data Assimilation System at NCAR: Current Capabilities and Ongoing Efforts

We will present a description of the CESM-DART ocean-atmosphere ensemble coupled data assimilation system being developed at the National Center for Atmospheric Research.  This will include current status, progress toward the  “strongly-coupled” framework, infrastructure work to support greater computational efficiency and ongoing efforts within the community to expand capabilities to new components.  Highlights from a configuration using the nominal 1-degree coupled global model constrained primarily by radiosonde atmospheric temperature and winds and by in-situ ocean hydrographic measurements will be presented, including metrics demonstrating the 6-hr forecast errors, ensemble reliability, simulation of large-scale climate modes (e.g. ENSO and NAO) and the instantaneous cross-interface correlations that may be exploited by a strongly-coupled system.