Ensemble filtering using a 3d chemical-dynamical middle atmosphere model
Tomoko Matsuo, GSP post doc
The mesosphere and lower thermosphere (MLT) region is a transition region
where wave energy originating from the troposphere and stratosphere
dissipates and is absorbed via dynamical, chemical, and radiative
processes, and its energetics and dynamics further affects the upper
thermosphere where the interactions between plasma and neutral species
become important. Recently launched Thermosphere, Ionosphere,
Mesosphere, Energetics and Dynamics (TIMED) spacecraft, together with a
network of ground-based observation sites, provides an unprecedented set
of comprehensive global measurements of the region.
With the NCAR Data Assimilation Research Testbed (DART) facility,
a prototype ensemble filter assimilation system for synthetic observations
using a 3-d chemical dynamical middle atmosphere model is being
constructed. Compared to the synoptic meteorological system in the
troposphere, the MLT region is significantly more dissipative and strongly
forced. We will discuss how an ensemble data assimilation problem can be
formulated in such a system especially when the model does not exhibit
natural error growth.
*(in collaboration with Jeffrey Anderson, Dan Marsh, and Anne Smith)
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