Twenty-first century reversal of the surface ozone seasonal cycle over the northeastern United States

Changing emissions can alter the surface O₃ seasonal cycle, as detected from northeastern U.S. (NE) observations during recent decades. Under continued regional precursor emission controls (>80% decreases in NE NOx by 2100), the NE surface O₃ seasonal cycle reverses (to a winter maximum) in 21st century transient chemistry-climate simulations. Over polluted regions, regional NOx largely controls the shape of surface O₃ seasonal cycles. In the absence of regional NOx controls, climate warming contributes to a higher surface O₃ summertime peak over the NE. A doubling of the global CH₄ abundance by 2100 partially offsets summertime surface O₃ decreases attained via NOx reductions and contributes to raising surface O₃ during December-March when the O₃ lifetime is longer. The similarity between surface O₃ seasonal cycles over the NE and the Intermountain West by 2100 indicates a NE transition to a region representative of baseline surface O₃ conditions.

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Copyright 2014 American Geophysical Union.


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Author Clifton, O.
Fiore, A.
Correa, G.
Horowitz, L.
Naik, Vaishali
Publisher UCAR/NCAR - Library
Publication Date 2014-10-28T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2025-07-12T00:05:04.283157
Metadata Record Identifier edu.ucar.opensky::articles:14477
Metadata Language eng; USA
Suggested Citation Clifton, O., Fiore, A., Correa, G., Horowitz, L., Naik, Vaishali. (2014). Twenty-first century reversal of the surface ozone seasonal cycle over the northeastern United States. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7gq6zrf. Accessed 03 August 2025.

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