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The world of DART: Data Assimilation Research Testbed



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The world of DART Data Assimilation Research Testbed Douglas Nychka www image ucar edu nychka Background Framework Tutorial Running DART what you need Getting DART Supported by the National Science Foundation DMS Background Jeff Anderson Joe Tribbia and Chris Snyder at NCAR proposed DART as an system Data assimilation for many different models and methods Light software that is easy to use by students Can tackle large models but is not state of art in speed for the biggest problems DART has incorporated the NCAR atmosphere models CAM WRF and provides analysis that are comparable in skill to the NCEP reanalysis Framework Tutorial Models and DA methods have to be written in a standard form DART compliant But this is not very demanding requirements DART can handle many different kinds of observation types But works by assimilating an observation sequence with the updates happening with scalar observations DART has a complicated system of creating the right executables by automatically writing makefiles The options in the excutables are controlled by easily modified files with options namelists All output written in a simple netcdf format A tutorial in PDF will lead a student scientist through the details of DART including exercises Running DART Download tar gz file 50 Mb Need F90 compiler netcdf libraries and matlab DART needs UNIX for shell and makefiles Even I understand how to use DART Well sort of Getting DART Search on DART NCAR Look for regular DART tutorials at NCAR



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