The world of DART:Data Assimilation Research TestbedDouglas Nychka,www.image.ucar.edu/~nychka• Background• Framework/Tutorial• Running DART what you need• Getting DARTSupported by the National Science Foundation DMS1BackgroundJeff Anderson, Joe Tribbia and Chris Snyder at NCARproposed DART as an system• Data assimilation for many different models and m eth-ods• Light software that is easy to use by students• Can tackle large models but is not ”state-of-art” inspeed for the biggest problemsDART has incorporated the NCAR atmosphere models(CAM, WRF) and provides analysis that are comparablein skill to the NCEP reanalysis.2Framework/Tutorial• Models and DA methods have to be written in astandard form (DART compliant). But this is notvery demanding requirements.• DART can handle many different kinds of observa-tion types. But works by assimilating an observationsequence with the updates happening with scalar ob-servations.• DART has a complicated system of creating theright executables by automatically writing makefiles.The options in the excutables are controlled by easilymodified files with options (namelists).• All o utput written in a simple netcdf format• A tutorial in PDF will lead a student/scientist throughthe details of DART including exercises.3Running DART• Download tar.gz file 50 Mb• Need F90 compiler, netcdf libraries and matlab.• DART needs UNIX for shell and makefilesEven I understand how to use DART!Well , sort of ...4Getting DARTSearch on DART NCARLook for regular DART tutorials at
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