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. Air quality modeling for research and regulatoryapplications often involves executing many emissions sensitivity cases toquantify impacts of hypothetical scenarios, estimate source contributions, orquantify uncertainties. Despite the prevalence of this task, conventionalapproaches for perturbing emissions in chemical transport models like theCommunity Multiscale Air Quality (CMAQ) model require extensive offlinecreation and finalization of alternative emissions input files. This workflow is often time-consuming, error-prone, inconsistent among model users, difficult to document, and dependent on increased hard disk resources. The Detailed Emissions Scaling, Isolation, and Diagnostic (DESID)module, a component of CMAQv5.3 and beyond, addresses these limitations byperforming these modifications online during the air quality simulation.Further, the model contains an Emission Control Interface which allows usersto prescribe both simple and highly complex emissions scaling operationswith control over individual or multiple chemical species, emissionssources, and spatial areas of interest. DESID further enhances thetransparency of its operations with extensive error-checking and optionalgridded output of processed emission fields. These new features are of highvalue to many air quality applications including routine perturbationstudies, atmospheric chemistry research, and coupling with external models(e.g., energy system models, reduced-form models).

The Detailed Emissions Scaling, Isolation, and Diagnostic (DESID) module in the Community Multiscale Air Quality (CMAQ) modeling system version 5.3.2