ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-6-187-2006 Technical note: Simulating chemical systems in Fortran90 and Matlab with the Kinetic PreProcessor KPP-2.1 Sandu A. 1 Sander R. 2 Department of Computer Science, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, USA Air Chemistry Department, Max-Planck Institute for Chemistry, Mainz, Germany 26 01 2006 6 1 187 195 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/6/187/2006/acp-6-187-2006.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/6/187/2006/acp-6-187-2006.pdf

This paper presents the new version 2.1 of the Kinetic PreProcessor (KPP). Taking a set of chemical reactions and their rate coefficients as input, KPP generates Fortran90, Fortran77, Matlab, or C code for the temporal integration of the kinetic system. Efficiency is obtained by carefully exploiting the sparsity structures of the Jacobian and of the Hessian. A comprehensive suite of stiff numerical integrators is also provided. Moreover, KPP can be used to generate the tangent linear model, as well as the continuous and discrete adjoint models of the chemical system.