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DART: A community facility for ensemble data assimilation
Jeffrey Anderson, NCAR, Boulder, CO; and T. Hoar, K. Raeder, N. Collins, H. Liu, G. Romine, and A. F. Arellano Jr.
The Data Assimilation Research Testbed (DART) is a mature community
software facility providing researchers access to state-of-the-art
ensemble data assimilation tools. The freely-available DART distribution
includes fully functional low-order and high-order models, support
for commonly available observations, hooks to easily add both new
models and observation types, diagnostic programs to interpret the
results, and a full tutorial suitable for self-study or teaching
data assimilation concepts, including exercises using the models
distributed with DART.
DART is used regularly with a number of geophysical models including
NCAR's WRF and CAM atmospheric models. DART/WRF is being used for
tropical storm analysis and prediction in the Pacific and Atlantic
and was used to produce real-time predictions during the 2009 Atlantic
hurricane season. DART/CAM has played an integral part in the development
of the new CAM version 4 that will be used for NCAR's contribution to
the next IPCC. DART/CAM has been run for many model configurations
to evaluate CAM systematic errors and parameterization options. DART
is also in use for chemical assimilation in the WRF-CHEM and CAM-CHEM
versions of these models.
New models, both small and large continue to be added to the set
compatible with DART. During 2009, DART assimilation was
developed for the POP (Parallel Ocean Program) ocean general circulation
model that is being used for decadal coupled model prediction at
NCAR. The newest version of the Planet WRF model, configured for
Martian data assimilation, is also now in use with DART.
Novel observation types also continue to be added to DART. For instance,
assimilation capabilities for radiance observations from the MOPITT
instrument on earth and from TES on Mars have been added in 2009.
New tools to improve and simplify the use of ensemble assimilation
continue to be added to the DART facility. Recent research has focused
on automated tools for reducing sampling errors in ensemble
assimilations.
Poster Session , Assimilation of observations and impact experiments
Monday, 18 January 2010, 2:30 PM-4:00 PM, Exhibit Hall B2
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