Presents:/slides/ 1 Use of Advanced Probing Tools in One-Atmosphere Air Quality Models for Model Evaluation, Culpability Assessment and Control Strategy Design Presented at Community Modeling and Analysis System (CMAS) October 2006 Conference Chapel Hill, North Carolina Ralph Morris, Bonyoung Koo, Gary Wilson & Greg Yarwood ENVIRON International Corporation 101 Rowland Way, Novato, CA. 94945 Presents:slides/
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Presented at Community Modeling and Analysis System (CMAS) October 2006 Conference
Use of Advanced Probing Tools in One-Atmosphere Air Quality Models for Model Evaluation, Culpability Assessment and Control Strategy Design. Presented at Community Modeling and Analysis System (CMAS) October 2006 Conference Chapel Hill, North Carolina - PowerPoint PPT Presentation
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Presents:/slides/1
Use of Advanced Probing Tools in One-Atmosphere Air Quality Models for Model
Evaluation, Culpability Assessment and Control Strategy Design
Presented at Community Modeling and Analysis System (CMAS)
October 2006 ConferenceChapel Hill, North Carolina
Ralph Morris, Bonyoung Koo, Gary Wilson & Greg Yarwood
ENVIRON International Corporation101 Rowland Way, Novato, CA. 94945
Introduction• Photochemical grid models (e.g. CMAQ and CAMx) are
used to design emission control strategies to demonstrate attainment of the 8-hour ozone and PM2.5 standards
• Such models are quite complex with full-science representation of transport and diffusion, gas-, aqueous- and aerosol-phase chemistry, cloud processes, gas/particle deposition etc.
• It is difficult and computationally intensive to diagnose why the model obtained its solution, what corrective action is needed to improve model performance and which sources contributed to the high concentrations
Presents:/slides/3
Probing Tools• Both CMAQ and CAMx incorporate “Probing
Tools” that extract additional information:– Process Analysis (PA)
• Identify the chemical processes in the simulation• Perform mass flux closure analysis
– Decoupled Direct Method (DDM)• Sensitivity to emissions categories and regions, BCs,
etc.
– Source Apportionment (SA)• Identify source regions/categories that contribute to
ozone, PM, etc.
Presents:/slides/4
What is a Probing Tool?
Probe verb, probed, prob ing, noun ‧1. to search into or examine thoroughly; question
closely
2. to examine or explore with a probe
3. to examine or explore with or as if with a probe
4. a slender surgical instrument for exploring the depth or direction of a wound, sinus, or the like
5. an investigation, esp. by a legislative committee, of suspected illegal activity.
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Alien Probing
Presents:/slides/6
Process Analysis (PA)• Pioneered out at research group at UNC Chapel Hill
– Chemical PA; Mass Flux (IPRs, IRRs)
• Extensively used for ozone– E.g., identification of VOC- vs. NOx-limited ozone
formation regimes in Houston (Jeffries et, al)– pyPA and pyPASS visualization tools (Vizuete et al.;
http://www.unc.edu/~vizuete/research.htm)
• Recently extended to PM modules in CAMx (CRC Project A-51b, Tonnesen et al., 2006)– Inorganic Aerosol, Organic Aerosol and Aqueous-Phase
Chemistry (http://www.crcao.com)
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Decoupled Direct Method (DDM)• Sensitivity of modeled concentrations to input
parameters– Primarily used for emissions– Georgia Institute of Technology (GIT) implemented 3-D
DDM in CMAQ (URM)• Has assisted in the identification of control strategies (e.g., GIT
SAMI analysis)
– DDM recently extended to PM modules in CAMx (CRC Project A-51a, Koo et al., 2006; http://www.crcao.com)
• Used for inverse modeling to identify potential areas of missing emissions (e.g., Houston ship channel VOC emissions)
Presents:/slides/8
Source Apportionment (SA)• CMAQ
– Tagged Species Source Apportionment (TSSA; UCR)• Implemented for SO4 and NO3 families
– Particle and Precursors Tagging Methodology (PPTM; SAI)
Conclusions: Hybrid PGMs for BART/PSD• Current generation of hybrid PGMs with grid
nesting, Plume-in-Grid and PM Source Apportionment able to treat single source PM, ozone and visibility impacts at all scales– Use of full chemistry– Accounts for three-dimensional winds/dispersion
• Available databases = Ease of use• Better science will result in more accurate and