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Future estimates of tropospheric ozone radiative forcing and methane turnover — The impact of climate change
Author(s) -
Stevenson D. S.,
Johnson C. E.,
Collins W. J.,
Derwent R. G.,
Edwards J. M.
Publication year - 2000
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 - 10.1029/1999gl010887
Subject(s) - radiative forcing , atmospheric sciences , environmental science , climatology , climate change , troposphere , climate model , tropospheric ozone , ozone , atmosphere (unit) , climate sensitivity , greenhouse gas , radiative transfer , forcing (mathematics) , gcm transcription factors , global warming , general circulation model , meteorology , geology , geography , oceanography , physics , quantum mechanics
We present a range of estimates for future radiative forcings due to changes in tropospheric ozone (O 3 T ). Ozone distributions were generated by the UKMO 3‐D chemistry‐transport model for 1990, 2030, 2060, and 2100, using four sets of boundary conditions. Anthropogenic emissions evolved following either the IPCC SRES “high” (A2) or “central” (B2) case. Each scenario was run with both a fixed (1990) climate, and with a changing climate, as generated by a coupled ocean‐atmosphere GCM, forced with IS92a emissions. Calculated global mean O 3 T radiative forcings for the A2 (B2) cases for 1990–2100 were +0.43 (+0.22) W m −2 when climate change was ignored; these fell to +0.27 (+0.09) W m −2 when climate change was included. Without climate change, CH 4 lifetimes (τ CH 4 ) lengthened by 7–12% between 1990 and 2100; however, when climate change was included, τ CH 4 fell by 0–5%. Hence climate warming exerts a negative feedback on itself by enhancing O 3 T and CH 4 destruction.