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SCICHEM 3.0b2 Release Notes
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SCICHEM 3.0b2 is a reactive puff model that can be used to calculate single or multi-source impacts of emissions at downwind locations. The model can be used for both short-range calculations of 1-hour SO2 or 1-hour NO2 concentrations at fenceline receptors or long-range calculations for primary and secondary pollutant impacts. For 1-hour NO2 applications, the model uses an optimized near-source NO-NO2-O3 chemistry scheme. For long-range applications, the full chemistry option can be used to calculate downwind ozone and PM2.5 concentrations. The full chemistry modules are based on those found in the Community Multiscale Air Quality (CMAQ) Model version 4.7.1. A user-provided input file determines which chemistry option is used. Sample input files for both 1-hour NO2 concentrations and full chemistry options are provided with the case studies in the SCICHEM distribution. In addition to the source code and executables, the package includes the following:
-	User's Guide, 
-	Technical documentation, 
-	5 case studies and accompanying tutorials, and 
-	These release notes.
If MMIF is to be used for a simulation, SCICHEM 3.0b2 requires MMIF version 3.1 or later for compatibility.
This is a beta release that is fully functional. However, it has not yet been completely tested for all possible conditions and it has not been built with all possible compilers and machine combinations. 
Windows and Linux versions of the executables are provided with the distribution. The Windows build uses the Intel compiler, while the Linux version is based on the Portland Group compiler. 
For users interested in building the executables on Linux machines, build scripts for the Portland Group compiler are provided. No other builds are supported at this time. The final version expected later in 2014 will be built and tested with other compilers before release. Code testing will continue during the beta-testing phase, but the feature set of the program will not change.
(The parallel chemistry code has not been fully implemented and tested and is not available to the user in this version. The parallel chemistry may be included in future versions of SCICHEM but not in version 3.0.)
Additional details and user instructions are provided in the documents bundled with the package. Beta-testers are requested to offer feedback to EPRI and the model developers on the model, including bug reports, and additional features that would make the model more useful to the air quality modeling community.