CAMx Base 2011 version A2 MOVES2014 Sensitivity Simulation

Introduction

We ran a CAMx sensitivity simulation derived from the 3SAQS 2011 Base version A2 CAMx (CAMx_3SAQS_Base11a_GCBC) configuration in which we replaced the onroad mobile emissions estimates from MOVES2010b with MOVES2014 emissions estimates. The CAMx 2011 MOVES emissions sensitivity simulation (CAMx_3SAQS_Base11a2_MOVES) is a sensitivity to evaluate the change in model performance resulting from replacing the on-road mobile emissions estimates from the previous version of the MOVES (2010b) model with estimates from the current version of MOVES (2014). Other than the MOVES emissions data, the configurations of the Base11a2 and Base11a2_MOVES simulations are exactly the same. Note that the Base11a2 simulation uses boundary conditions from the GEOS-Chem model.

EPA generated both MOVES simulations for the NEI2011 modeling platform. The on-road mobile emissions from the MOVES2010b simulation, which was used for the 3SAQS Base11a and Base11a2 CAMx simulations, was distributed by EPA as part of the NEI2011v1 platform. The MOVES2014 emissions are part of the NEI2011v2 platform and were released by EPA in early 2015.

The two MOVES simulations differ in the following ways:

• MOVES2014 is a reformulation of the MOVES model with different representations of the on-road mobile emissions processes, control programs, and user interface. See the EPA Q&A Fact Sheet on the differences between MOVES2014 and older versions of the model.
• Updated activity and speeds inventories
• Updated VOC speciation profiles

In March 2015 we will use MOVES 2014 emissions factor look up tables created by EPA OAQPS for the NEI2011v2 modeling platform to prepare CAMx-ready emissions for the months of January and July. We will use these emissions data to evaluate the sensitivity of CAMx to the changes resulting from the MOVES2014 on-road mobile emissions.

In the Results section of this page we are posting comparisons of the emissions and air quality modeling results for the base (2011a2) and sensitivity simulations.

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Request for Comments

The Western Air Quality Study modeling team is seeking comments from cooperators on the emissions and air quality results of this sensitivity simulation. In particular, we're interested in hearing from people with expertise in on-road mobile sources in the three-state region about the emissions changes between the two versions of MOVES.

Please review the county total emissions in Table 1 and provide any comments on these results to Tom Moore. We are interested in the following trends in these results:

• Do the increases/decreases between

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Results

Table 1 shows daily county total emissions comparisons between MOVES2010b and MOVES2014 for a typical weekday in January and July 2011. The MOVES2010b emissions totals are from 3SAQS simulation Base2011a and the MOVES2014 emissions totals are from the Base2011a2_MOVES sensitivity simulation.

Table 1. Comparison of Base11a (MOVES201b) and MOVES2014 Daily Total Emissions

State	CO	NOx	TOG	SO2	PM2.5
Colorado	Plot	Plot	Plot	Plot	Plot
Utah	Plot	Plot	Plot	Plot	Plot
Wyoming	Plot	Plot	Plot	Plot	Plot