Decadal changes in summertime reactive oxidized nitrogen and surface ozone over the Southeast United States

Li, Jingyi; Mao, Jingqiu; Fiore, Arlene M.; Cohen, Ronald C.; Crounse, John D.; Teng, Alex P.; Wennberg, Paul O.; Lee, Ben H.; Lopez-Hilfiker, Felipe D.; Thornton, Joel A.; Peischl, Jeff; Pollack, Ilana B.; Ryerson, Thomas B.; Veres, Patrick; Roberts, James M.; Neuman, J. Andrew; Nowak, John B.; Wolfe, Glenn M.; Hanisco, Thomas F.; Fried, Alan; Singh, Hanwant B.; Dibb, Jack; Paulot, Fabien; Horowitz, Larry W.

doi:10.5194/acp-18-2341-2018

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Decadal changes in summertime reactive oxidized nitrogen and surface ozone over the Southeast United States

2018
By Li, Jingyi ; Mao, Jingqiu ; Fiore, Arlene M. ; ...
Source: Atmospheric Chemistry and Physics, 18(3), 2341-2361.

[PDF-1.45 MB]

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Journal Title:

Atmospheric Chemistry and Physics
Personal Author:

Li, Jingyi ; Mao, Jingqiu ; Fiore, Arlene M. ; Cohen, Ronald C. ; Crounse, John D. ; ... More +

Li, Jingyi ; Mao, Jingqiu ; Fiore, Arlene M. ; Cohen, Ronald C. ; Crounse, John D. ; Teng, Alex P. ; Wennberg, Paul O. ; Lee, Ben H. ; Lopez-Hilfiker, Felipe D. ; Thornton, Joel A. ; Peischl, Jeff ; Pollack, Ilana B. ; Ryerson, Thomas B. ; Veres, Patrick ; Roberts, James M. ; Neuman, J. Andrew ; Nowak, John B. ; Wolfe, Glenn M. ; Hanisco, Thomas F. ; Fried, Alan ; Singh, Hanwant B. ; Dibb, Jack ; Paulot, Fabien ; Horowitz, Larry W. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory) ; GFDL (Geophysical Fluid Dynamics Laboratory)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory) ; GFDL (Geophysical Fluid Dynamics Laboratory) Less -
Description:

' Widespread efforts to abate ozone (O-3) smog have significantly reduced emissions of nitrogen oxides (NOx) over the past 2 decades in the Southeast US, a place heavily influenced by both anthropogenic and biogenic emissions. How reactive nitrogen speciation responds to the reduction in NOx emissions in this region remains to be elucidated. Here we exploit aircraft measurements from ICARTT (July-August 2004), SENEX (June-July 2013), and SEAC(4)RS (August-September 2013) and long-term ground measurement networks alongside a global chemistry-climate model to examine decadal changes in summertime reactive oxidized nitrogen (RON) and ozone over the Southeast US. We show that our model can reproduce the mean vertical profiles of major RON species and the total (NOy) in both 2004 and 2013. Among the major RON species, nitric acid (HNO3) is dominant (similar to 42-45 %), followed by NOx (31 %), total peroxy nitrates (Sigma PNs; 14 %), and total alkyl nitrates (Sigma ANs; 9-12 %) on a regional scale. We find that most RON species, including NOx, Sigma PNs, and HNO3, decline proportionally with decreasing NOx emissions in this region, leading to a similar decline in NOy. This linear response might be in part due to the nearly constant summertime supply of biogenic VOC emissions in this region. Our model captures the observed relative change in RON and surface ozone from 2004 to 2013. Model sensitivity tests indicate that further reductions of NOx emissions will lead to a continued decline in surface ozone and less frequent high-ozone events.
Source:

Atmospheric Chemistry and Physics, 18(3), 2341-2361.
DOI:

https://doi.org/10.5194/acp-18-2341-2018
Document Type:

Journal Article
Funding:

Grant no. NA13OAR431007 ; Grant no. NA14OAR4310133

Grant no. NA13OAR431007 ; Grant no. NA14OAR4310133 Less -
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CC BY
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Submitted
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urn:sha256:9bb522da6bd2bec96777fd0d82ecdf50a89fa5e1826b916ee07c45d5eb55ecfd
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https://repository.library.noaa.gov/view/noaa/21709/noaa_21709_DS1.pdf
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Decadal changes in summertime reactive oxidized nitrogen and surface ozone over the Southeast United States

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