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Sensitivity of Tropospheric Ozone Over the Southeast USA to Dry Deposition
Author(s) -
Baublitz Colleen B.,
Fiore Arlene M.,
Clifton Olivia E.,
Mao Jingqiu,
Li Jingyi,
Correa Gus,
Westervelt Daniel M.,
Horowitz Larry W.,
Paulot Fabien,
Williams A. Park
Publication year - 2020
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 - 10.1029/2020gl087158
Subject(s) - ozone , tropospheric ozone , atmospheric sciences , environmental science , sink (geography) , reactive nitrogen , troposphere , climatology , atmospheric chemistry , deposition (geology) , nitrogen , meteorology , chemistry , geography , geology , cartography , organic chemistry , paleontology , sediment
Dry deposition (DD) is a major loss process for tropospheric ozone and some reactive nitrogen and carbon precursors. We investigate the response of summertime ozone and its production chemistry over the Southeast United States (USA) to variability in this sink. Turning off DD of oxidized nitrogen, ozone, or all species over the United States in the Geophysical Fluid Dynamics Laboratory AM3 model increases regional mean surface ozone by 5, 18, or 25 ppb, respectively. Additional sensitivity simulations demonstrate that, assuming linearity, surface ozone has a similar sensitivity to ozone DD as to NO x emissions. Trends in ozone production efficiency derived from observed relationships between ozone and precursor oxidation products may not solely reflect precursor emission changes if ozone DD varies (e.g., with meteorology). We conclude that DD variability merits consideration when interpreting observed ozone trends. Quantifying the impact of changes in sinks versus sources will require long‐term DD measurements across the region of interest.