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Twenty‐first century reversal of the surface ozone seasonal cycle over the northeastern United States
Author(s) -
Clifton O. E.,
Fiore A. M.,
Correa G.,
Horowitz L. W.,
Naik V.
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl061378
Subject(s) - climatology , atmospheric sciences , environmental science , ozone , seasonality , surface air temperature , climate change , annual cycle , climate model , geography , meteorology , geology , oceanography , statistics , mathematics
Changing emissions can alter the surface O 3 seasonal cycle, as detected from northeastern U.S. (NE) observations during recent decades. Under continued regional precursor emission controls (>80% decreases in NE NO x by 2100), the NE surface O 3 seasonal cycle reverses (to a winter maximum) in 21st century transient chemistry‐climate simulations. Over polluted regions, regional NO x largely controls the shape of surface O 3 seasonal cycles. In the absence of regional NO x controls, climate warming contributes to a higher surface O 3 summertime peak over the NE. A doubling of the global CH 4 abundance by 2100 partially offsets summertime surface O 3 decreases attained via NO x reductions and contributes to raising surface O 3 during December–March when the O 3 lifetime is longer. The similarity between surface O 3 seasonal cycles over the NE and the Intermountain West by 2100 indicates a NE transition to a region representative of baseline surface O 3 conditions.