Lawrence Takacs

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Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA scientific and technical information (STI) program plays a key part in helping NASA maintain this important role. The NASA STI program operates under the auspices of the Agency Chief Information Officer. It collects, organizes, provides for archiving,(More)
ii Abstract A detailed description of the numerical formulation of Version 2 of the ARIES/GEOS \dynamical core" is presented. This code is a nearly \plug-compatible" dynamics for use in atmospheric general circulation models (GCMs). It is a nite diierence model on a staggered latitude-longitude C-grid. It uses second-order diierences for all terms except(More)
This presentation discusses the NASA data assimilation project at the Data Assimilation Office at the NASA/Goddard Space Flight Center. The goal is to produce accurate gridded datasets of atmospheric fields by assimilating a range of observations along with physically consistent model forecasts. This work produces datasets that are used by the climate(More)
The age of air has recently emerged as a diagnostic of atmospheric transport unaffected by chemical param-eterizations, and the features in the age distributions computed in models have been interpreted in terms of the models' large-scale circulation field. This study shows, however, that in addition to the simulated large-scale circulation,(More)
We introduce the parallel grid manipulations needed in the Earth Science applications currently being implemented at the Data Assimilation OOce (DAO) of the National Aeronautics and Space Administration (NASA). Due to real-time constraints the DAO software must run eeciently on parallel computers. Numerous grids, structured and unstructured are employed in(More)
This presentation discusses the NASA data assimilation project at the Data Assimilation OOce at the NASA/Goddard Space Flight Center. The goal is to produce accurate gridded datasets of atmospheric elds by assimilating a range of observations along with physically consistent model forecasts. This work produces datasets that are used by the climate research(More)