Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 24, Pages 12614-12623Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL071930
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Funding
- UK Natural Environment Research Council SMURPHS [NE/N006054/1]
- Research Council of Norway project MOCA [225814]
- NERC [NE/N006054/1] Funding Source: UKRI
- Natural Environment Research Council [NE/N006054/1] Funding Source: researchfish
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New calculations of the radiative forcing (RF) are presented for the three main well-mixed greenhouse gases, methane, nitrous oxide, and carbon dioxide. Methane's RF is particularly impacted because of the inclusion of the shortwave forcing; the 1750-2011 RF is about 25% higher (increasing from 0.48 W m(-2) to 0.61 W m(-2)) compared to the value in the Intergovernmental Panel on Climate Change (IPCC) 2013 assessment; the 100year global warming potential is 14% higher than the IPCC value. We present new simplified expressions to calculate RF. Unlike previous expressions used by IPCC, the new ones include the overlap between CO2 and N2O; for N2O forcing, the CO2 overlap can be as important as the CH4 overlap. The 1750-2011 CO2 RF is within 1% of IPCC's value but is about 10% higher when CO2 amounts reach 2000 ppm, a value projected to be possible under the extended RCP8.5 scenario.
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