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	Size-Composition Resolved Aerosol Model (SCRAM) SCRAM simulates the dynamics (coagulation, condensation/evaporation and nucleation) of externally-mixed atmospheric particles.

Model description

SCRAM classifies aerosols by both composition and size, based on a comprehensive combination of all chemical species and their mass-fraction sections. All three main processes involved in aerosol dynamics (coagulation, condensation/evaporation and nucleation) are included. Please read the reference paper for more theoretical details and model validation.
SCRAM is a free software. You can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation.
Hardware and Software Requirement

SCRAM is written in the programming language FORTRAN with the support of some foreign functions written in C++. It can run on PC or a cluster with both the gfortran and the GUN gcc Compiler and under a Linux system. Before the compilation, make sure the construction tool: SCONS has already been installed. If not you can obtain it through the following instruction of the site below:
http://www.scons.org/wiki/SconsTutorial1
The random access memory (RAM) requirement for the 0D simulation is very small. For example: it only takes 4MB RAM for the fully dynamic external simulation case presents in the fourth section of the manuscript. And it nished the 12 hours simulation in about 2 minutes on a standard pc with a processor clocked at 3.20 GHz and requires about 1MB of disk space. The NetCDF library is also required, you can download from the following site:
http://www.unidata.ucar.edu/downloads/netcdf/index.jsp
After all the required software and library are ready, the compilation can be done by typing a simple command: scons, within a terminal under the program main path.
User Manual
Technical details about how to operate the model as will as input and output files, please read the User Manual.
Download

SCRAM v1.1:
Introduced a new redistribution method for bulk equilibrium approach.

SCRAM v1.0:
Orignial version.
Reference

S. Zhu, K. N. Sartelet, and C. Seigneur (2015) A size-composition resolved aerosol model for simulating the dynamics of externally mixed particles: SCRAM (v 1.0) Geosci. Model Dev.
Contact

If you have further questions, please contact Karine Sartelet karine.sartelet@enpc.fr