# camx7.2modified **Repository Path**: wangcd0710/camx7.2modified ## Basic Information - **Project Name**: camx7.2modified - **Description**: No description available - **Primary Language**: Unknown - **License**: Not specified - **Default Branch**: main - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2026-06-25 - **Last Updated**: 2026-07-03 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README INTRODUCTION ------------ This is the README file for the CAMx model that includes information about: 1) License agreement 2) CAMx e-mail contacts 3) Upgrading to the latest version of CAMx 4) The distributed test case Further details about CAMx are provided in the Release Notes and in the CAMx User's Guide, available from www.camx.com. 1. LICENSE AGREEMENT -------------------- Read the "LICENSE" file included with the source code. The LICENSE is also accessible from the CAMx website download page: https://www.camx.com/download/ or directly via: http://camx.com/Files/LICENSE_v720.txt You agree to the CAMx license terms by downloading the source code and using the CAMx model. 2. CAMx E-MAIL CONTACTS ----------------------- Join the CAMx User's Group by sending an e-mail message to: camxdevel at gmail dot com with the words “subscribe CAMxusers” in the BODY of the message. You will receive an invitation to join the Google Group along with additional information on how to use this service. The camxusers group is meant for broadcasting useful information about CAMx and its pre- and post-processors to all users that subscribe to this group, or to ask about available datasets or issues that other users may have come across. It is not meant for asking how to run CAMx, how to prepare inputs, or why CAMx arrived at a particular prediction. ** PLEASE REFER TO THE CAMx USER'S GUIDE FIRST ** 3. UPGRADING TO CAMx V7 FROM PREVIOUS VERSIONS ---------------------------------------------- V7.x is a major update from previous releases (v6.x). In general, all of the inputs developed for CAMx prior to v7 can be used in v7+ versions, except for O3MAP and TUV photolysis input files -- you must re-generate those. Version 7 introduces netCDF input file formats for all large gridded arrays: meteorology, landcover, initial/boundary/top concentrations, point sources, 2-D and 3-D emissions. Output concentration, deposition and Probing Tool files can also be generated in netCDF format (since v6.5). The Fortran binary I/O formats are still allowed, but this option will be removed in the future. Multiple point, 2-D and 3-D emission files can be provided to CAMx and Probing Tools, alleviating the need to merge component emissions into single input files. Except for the new 3-D emissions file, which must be in netCDF format, multiple emission files can be netCDF or Fortran binary format, or any mix of the two. NOTE on Source Apportionment Technology (SAT): With this change, SAT input point source emission files are used to define emissions for BOTH the core model and the SAT application. In earlier CAMx versions, separate sets of core and SAT point source files were listed and the model compared SAT point emissions to core model inputs to ensure consistency. Now ALL SAT point emissions are always used for BOTH SAT and the core model. A "leftover" capability remains available for gridded emissions, based on differences between SAT emission inputs and core model emission inputs, but not for point emissions. It is no longer necessary to provide a consistent list of point sources among all of the SAT point source files. The list of points to model are now an internal concatonation of point source lists from each input SAT point source file. NOTE on DDM and RTRAC: With this change, DDM and RTRAC input point source emission files can include stack lists that are entirely unique to these Probing Tools. Earlier CAMx versions required a consistent list of point sources among the core model, DDM and RTRAC, which was onerous. This restriction is removed. See the User's Guide for more information on file formats, requirements and restrictions. Refer to the namelist template provided with the source code and the User's Guide for a full list of namelist variables for this version. Some new variables have been added. Visit www.camx.com to obtain the latest code, version-specific input files (e.g., chemistry parameters) and all test case I/O. 4. CAMx TEST CASE ----------------- A test case is provided to help new CAMx User's get started and permit performance benchmarking. The test case is based on the US EPA's 2016 Modeling Platform, with a single nested domain covering the Eastern U.S. The test case includes inputs and outputs for 2 days of simulation over June 10-11, 2016, which are available at www.camx.com. You can compare your results to the test case benchmark by displaying the concentration outputs using graphics programs. You can perform a more rigorous check by comparing the concentration outputs using the "AVGDIF" program. AVGDIF is on the CAMx web site in the download/support programs area. We expect concentrations to agree within the limits of single precision calculation, namely relative errors of about 1 in 100,000.