Contrasting seasonal responses of sulfate aerosols to declining SO2 emissions in the Eastern U.S.: Implications for the efficacy of SO2 emission controls

Paulot, F.; Fan, S.; Horowitz, L. W.

doi:10.1002/2016GL070695

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Contrasting seasonal responses of sulfate aerosols to declining SO2 emissions in the Eastern U.S.: Implications for the efficacy of SO2 emission controls

2017
By Paulot, F. ; Fan, S. ; Horowitz, L. W.
Source: Geophysical Research Letters, 44(1), 455-464

[PDF-1.37 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Paulot, F. ; Fan, S. ; Horowitz, L. W.

Paulot, F. ; Fan, S. ; Horowitz, L. W. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory)

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) Less -
Description:

Stringent controls have reduced U.S. SO2 emissions by over 60% since the late 1990s. These controls have been more effective at reducing surface in summer (June, July, and August) than in winter (December, January, and February (DJF)), a seasonal contrast that is not robustly captured by Climate Model Intercomparison Project 5 global models. We use the Geophysical Fluid Dynamics Laboratory AM3 chemistry-climate model to show that oxidant limitation during winter causes (DJF) to be sensitive to primary emissions, in-cloud titration of H2O2, and in-cloud oxidation by O3. The observed contrast in the seasonal response of to decreasing SO2 emissions is best explained by the O3 reaction, whose rate coefficient has increased over the past decades as a result of increasing NH3 emissions and decreasing SO2 emissions, both of which lower cloud water acidity. The fraction of SO2 oxidized to is projected to keep increasing in future decades, delaying improvements in wintertime air quality.
Keywords:

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Aerosols Sulfates Air Quality Castnet Cloud Chemistry CMIP Seasonal Trend Sulfate Aerosol
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Geophysical Research Letters, 44(1), 455-464
DOI:

https://doi.org/10.1002/2016GL070695
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Journal Article
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urn:sha256:7788aaa02b670c96503b47ca1e9a4f94f5c3ca8857fdabdd40d1de85874de423
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Contrasting seasonal responses of sulfate aerosols to declining SO2 emissions in the Eastern U.S.: Implications for the efficacy of SO2 emission controls

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