Data assimilation chapter 5 atmospheric modeling, data. There may be a number of different goals sought, for exampleto determine the optimal state estimate of a system, to determine initial conditions for a numerical forecast model, to interpolate sparse observation data using e. Recent research and development activities in data. A strategy for data assimilation technical memorandum no. Assimilation of meteorological or oceanographical observations can be described as the process through which all the available information is used in order to estimate as accurately as possible the state of the atmospheric or oceanic flow. Data assimilation is a mathematical discipline that seeks to optimally combine theory usually in the form of a numerical model with observations. This is considered to be a crucial element of weather fore. Ecmwfs 4dvar data assimilation system the genesis and. Adjoint model code generation via automatic differentiation and its application to ocean sea ice state estimation patrick heimbach and dimitris menemenlis. Dart, developed and maintained at the national center for atmospheric research, provides welldocumented software tools for data assimilation education, research, and development. Philippe courtier and olivier talagrand quickly set out to demonstrate these capabilities of 4dvar with a vorticity equation model in 1986 and a shallow water model in 1987 published in 1987 and 1990, respectively. System development and preliminary testing hongli wang,juanzhen sun,xin zhang,xiangyu huang, and thomas auligne national center for atmospheric research, boulder, colorado.
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