Modeling intercontinental transport of ozone in North America with CAMx for the Air Quality Model Evaluation International Initiative (AQMEII) Phase 3

Nopmongcol, Uarporn; Liu, Zhen; Stoeckenius, Till; Yarwood, Greg

doi:https://doi.org/10.5194/acp-17-9931-2017

Articles | Volume 17, issue 16

https://doi.org/10.5194/acp-17-9931-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

Global and regional assessment of intercontinental transport...

https://doi.org/10.5194/acp-17-9931-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 17, issue 16

Research article

|

24 Aug 2017

Research article |

| 24 Aug 2017

Modeling intercontinental transport of ozone in North America with CAMx for the Air Quality Model Evaluation International Initiative (AQMEII) Phase 3

Uarporn Nopmongcol, Zhen Liu, Till Stoeckenius, and Greg Yarwood

Supplement

https://doi.org/10.5194/acp-17-9931-2017-supplement

Data sets

CAMx data CAMx http://www.camx.com/

AQS EPA https://www.epa.gov/aqs

CASTNET EPA https://www.epa.gov/castnet

AQMEII European Commission http://aqmeii.jrc.ec.europa.eu/

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Short summary

The CAMx regional model was used to examine contribution of intercontinental transport over North America as part of AQMEII Phase III. Largest boundary condition (BC) contributions to ozone (O₃) are from the mid-troposphere. Lower emissions in Asia by 20 % causes a near-linear relationship between the BC O₃ changes and surface O₃ changes in the western US, but the changes are less than 1 ppb. Using inert tracers leads to high bias over 10 ppb compared to using chemically reactive tracers.