Geoscientific Model Development www.geosci-model-dev.net 1991-959X 1991-9603 2 2 2009 10.5194/gmd-2-89-2009 http://www.geosci-model-dev.net/2/89/2009/ http://www.geosci-model-dev.net/2/89/2009/gmd-2-89-2009.html http://www.geosci-model-dev.net/2/89/2009/gmd-2-89-2009.pdf 89 96 2009-07-22 Implementation and evaluation of an array of chemical solvers in the Global Chemical Transport Model GEOS-Chem P. Eller K. Singh A. Sandu K. Bowman D. K. Henze M. Lee Department of Computer Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060, USA NASA Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA Earth Institute, Columbia University, 2880 Broadway, New York, NY 10025, USA This paper discusses the implementation and performance of an array of gas-phase chemistry solvers for the state-of-the-science GEOS-Chem global chemical transport model. The implementation is based on the Kinetic PreProcessor (KPP). Two perl parsers automatically generate the needed interfaces between GEOS-Chem and KPP, and allow access to the chemical simulation code without any additional programming effort. This work illustrates the potential of KPP to positively impact global chemical transport modeling by providing additional functionality as follows. (1) The user can select a highly efficient numerical integration method from an array of solvers available in the KPP library. (2) KPP offers a wide variety of user options for studies that involve changing the chemical mechanism (e.g., a set of additional reactions is automatically translated into efficient code and incorporated into a modified global model). (3) This work provides access to tangent linear, continuous adjoint, and discrete adjoint chemical models, with applications to sensitivity analysis and data assimilation. Carmichael, G. R., Chai, T., Sandu, A., Constantinescu, E. 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