About the DESID category

lizadams · February 21, 2023, 1:49pm

Category for issues or questions related to utilizing the DESID Control namelists to perform some basic manipulation of their emission streams.

Additional resources:

Documentation for DESID:

github.com

USEPA/CMAQ/blob/main/DOCS/Users_Guide/CMAQ_UG_ch04_model_inputs.md#48-emissions-inputs


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# 4. Model Input Files

## 4.1 Introduction
This chapter provides basic information on the format and content of CMAQ input files.  It also provides information on using the pre-processing tools provided in the repository for preparing initial and boundary conditions and meteorology inputs.  Links are provided for  the emissions processing tools that are released through their own repository or website.  A list of CMAQ input files can be found in [Table 4-1](#Input_Table). Some CMAQ input files are in ASCII format while the majority of them are in the [Network Common Data Form (netCDF) format](http://www.unidata.ucar.edu/software/netcdf). CMAQ input and output files are self-describing netCDF-format files in which the file headers have all the dimensioning and descriptive information needed to define the resident data. Users should download the latest code for the NetCDF from the [NetCDF website](http://www.unidata.ucar.edu/software/netcdf). Compilation and configuration information for the NetCDF is available through the Unidata website.

All CMAQ input and output files are conformed to I/O API netCDF file format. Please refer to the [I/O API User's Manual](https://www.cmascenter.org/ioapi/documentation/all_versions/html) for details.

Full input datasets for 2016 over two domains are publically available to download from the CMAS Data Warehouse.  The input files are stored on Google Drive with metadata organized through Dataverse.  

|**Domain**|**Simulation Dates**|**Dataverse DOI**| 
|:--------------:|:----:|:--------:|
| Southeast US | July 1 - 14, 2016| https://doi.org/10.15139/S3/IQVABD |
| CONUS | Jan 1 - Dec 31, 2016 | https://doi.org/10.15139/S3/MHNUNE |

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Tutorial for using DESID is available here:

github.com

USEPA/CMAQ/blob/main/DOCS/Users_Guide/Tutorials/CMAQ_UG_tutorial_emissions.md

## CMAQ Tutorial ##
### Prescribing Emissions Using DESID (Detailed Emissions Scaling, Isolation and Diagnostics) Module ###
Purpose: This tutorial will guide users to utilizing the DESID Control namelists to perform some basic manipulation
of their emission streams. For additional questions, contact Ben Murphy (murphy.ben@epa.gov) or visit the CMAS Forum.

------------

### Definitions of Terms
- Stream: An Online emission source or a group of sources processed offline and read into CMAQ from one file. Common
examples of streams include biogenic VOCs, mobile sources, wind-blown dust, prescribed fires, electric-generating units,
residential heating, etc.  
- Species: A variable representing a chemical compound or group of compounds in CMAQ.  
- Surrogate: A variable representing a chemical compound or group of compounds on an emission Stream.  

### Important Notes to Remember
- Rules are applied in the order they are provided.

### Example Use Cases
- [1. Zero out emissions](#zero_out)  
- [2. Add emissions for a new tracer species](#add_emissions)

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lizadams · March 14, 2023, 2:24pm

comment to avoid “where topics have zero replies”.

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About the DESID category

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