key drivers of ozone change and its radiative forcing over the 21st century
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ID: 243796
2018
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Abstract
Over the 21st century changes in both tropospheric and
stratospheric ozone are likely to have important consequences for the Earth's
radiative balance. In this study, we investigate the radiative forcing from
future ozone changes using the Community Earth System Model (CESM1), with
the Whole Atmosphere Community Climate Model (WACCM), and including fully
coupled radiation and chemistry schemes. Using year 2100 conditions from the
Representative Concentration Pathway 8.5 (RCP8.5) scenario, we quantify the
individual contributions to ozone radiative forcing of (1) climate change,
(2) reduced concentrations of ozone depleting substances (ODSs), and
(3) methane increases. We calculate future ozone radiative forcings and their
standard error (SE; associated with inter-annual variability of ozone) relative to
year 2000 of (1) 33 ± 104 m Wm−2,
(2) 163 ± 109 m Wm−2, and (3) 238 ± 113 m Wm−2 due
to climate change, ODSs, and methane, respectively. Our best estimate of net
ozone forcing in this set of simulations is 430 ± 130 m Wm−2
relative to year 2000 and 760 ± 230 m Wm−2 relative to year
1750, with the 95 % confidence interval given by ±30 %. We find
that the overall long-term tropospheric ozone forcing from methane
chemistry–climate feedbacks related to OH and methane lifetime is relatively
small (46 m Wm−2). Ozone radiative forcing associated with climate
change and stratospheric ozone recovery are robust with regard to background
climate conditions, even though the ozone response is sensitive to both
changes in atmospheric composition and climate. Changes in
stratospheric-produced ozone account for ∼ 50 % of the overall
radiative forcing for the 2000–2100 period in this set of simulations,
highlighting the key role of the stratosphere in determining future ozone
radiative forcing.
| Reference Key |
iglesias-suarez2018atmospherickey
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|---|---|
| Authors | ;F. Iglesias-Suarez;F. Iglesias-Suarez;F. Iglesias-Suarez;D. E. Kinnison;A. Rap;A. C. Maycock;O. Wild;O. Wild;P. J. Young;P. J. Young;P. J. Young |
| Journal | Journal of agricultural and food chemistry |
| Year | 2018 |
| DOI |
10.5194/acp-18-6121-2018
|
| URL | |
| Keywords |
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