using cmaq-aim to evaluate the gas-particle partitioning treatment in cmaq chris nolte atmospheric...
TRANSCRIPT
![Page 1: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/1.jpg)
Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in
CMAQ
Chris Nolte
Atmospheric Modeling Division
National Exposure Research Laboratory
October 19, 2004
![Page 2: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/2.jpg)
Acknowledgements
Prakash Bhave
Robin Dennis
K. Max Zhang
Tony Wexler
Lucille Bender
Charles Chang
![Page 3: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/3.jpg)
Outline
• Characteristics of the CMAQ and CMAQ-AIM aerosol modules
• Approach
• Results
• Conclusions & Future Work
![Page 4: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/4.jpg)
Comparison between CMAQ and CMAQ-AIM
Feature CMAQ CMAQ-AIM
Size representationModal
(3 lognormal modes)
Sectional
(currently 9 sections)
Mass transfer to
fine PMInstantaneous
equilibriumDynamic
Mass transfer to coarse PM
None Dynamic
Thermodynamics ISORROPIA AIM
![Page 5: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/5.jpg)
Comparison between CMAQ and CMAQ-AIM
(continued)
Feature CMAQ CMAQ-AIM
Equilibrium State Metastable Stable
Sea salt No Yes
N2O5 → HNO3 heterogeneous conversion
No No
Coagulation Yes No
![Page 6: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/6.jpg)
Approach
Model to model comparison
• Continental US domain, 32 km grid cell size, 24 vertical layers, SAPRC 99 chemical mechanism
• Summer (Jun 24 – Jul 31, 2001) and winter (Dec 24 – Jan 31, 2002) modeling periods
![Page 7: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/7.jpg)
Results: O3Average ozone concentrations are identical in the two models.
![Page 8: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/8.jpg)
Results: O3Average ozone concentrations are identical in the two models.
![Page 9: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/9.jpg)
Excellent agreement in average SO4 concentrations Results: SO4
![Page 10: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/10.jpg)
Excellent agreement in average SO4 concentrations Results: SO4
![Page 11: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/11.jpg)
O3 and SO4 Difference Plots(CMAQ-AIM minus CMAQ)
![Page 12: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/12.jpg)
O3 and SO4 Difference Plots(CMAQ-AIM minus CMAQ)
![Page 13: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/13.jpg)
Results: Total NO3
![Page 14: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/14.jpg)
Results: Total NO3
![Page 15: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/15.jpg)
TNO3 Difference Plots (CMAQ-AIM minus CMAQ)
![Page 16: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/16.jpg)
Results: Fine NO3
![Page 17: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/17.jpg)
Results: Fine NO3
![Page 18: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/18.jpg)
Fine NO3 Difference Plots (CMAQ-AIM minus CMAQ)
![Page 19: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/19.jpg)
Results: HNO3
![Page 20: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/20.jpg)
Results: HNO3
![Page 21: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/21.jpg)
HNO3 Difference Plots(CMAQ-AIM minus CMAQ)
![Page 22: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/22.jpg)
Results: NH4
![Page 23: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/23.jpg)
Results: NH4
![Page 24: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/24.jpg)
NH4 Difference Plots(CMAQ-AIM minus CMAQ)
![Page 25: Using CMAQ-AIM to Evaluate the Gas-Particle Partitioning Treatment in CMAQ Chris Nolte Atmospheric Modeling Division National Exposure Research Laboratory](https://reader035.vdocuments.mx/reader035/viewer/2022062517/56649f2b5503460f94c45385/html5/thumbnails/25.jpg)
Conclusions• Initial comparisons of CMAQ and CMAQ-AIM show
good agreement.
• Differences in nitrate partitioning may be due to:(1) Equilibrium assumption vs. dynamic mass transfer(2) Different thermodynamics - activity coefficients
(3) Coarse mode sink for NO3
• Future work will involve trying to evaluate these differences independently(1) Run CMAQ-AIM without sea-salt emissions(2) Run CMAQ-AIM with ISORROPIA
The research presented here was performed under the Memorandum of Understanding between the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Commerce’s National Oceanic and Atmospheric Administration (NOAA) and under agreement number DW13921549. Although it has been reviewed by EPA and NOAA and approved for publication, it does not necessarily reflect their policies or views.