IPCC Expert Meeting on the Science of Alternative Metrics, by Gian-Kasper Plattner, Thomas Stocker, Pauline Midgley,

By Gian-Kasper Plattner, Thomas Stocker, Pauline Midgley, Melinda Tignor

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Additional resources for IPCC Expert Meeting on the Science of Alternative Metrics, Oslo, Norway, 18-20 March 2009

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Results from the C4MIP project shows that this latter is still highly model dependent and is poorly constrained by current observations. The same could apply to methane but a methane-climate feedback estimate is still lacking. Finally I highlight the implication on GWP of a CO2 or CH4 emissions originating from biological processes as compared to emissions from industrial processes. IPCC Expert Meeting on the Science of Alternative Metrics - 29 IPCC Expert Meeting on the Science of Alternative Metrics - 30 Impacts of Metric Choice on Analyzing the Climate Effects of Emissions Jan Fuglestvedt Center for International Climate and Environmental Research (CICERO), University of Oslo, Norway The UNFCCC requires climate policies to ‘be cost-effective so as to ensure global benefits at the lowest possible cost’ and that ‘policies and measures should ...

After this time the positive iRF from CO2 dominates. Thus the indicator iRF has a strong memory that puts equal weight on RF at all times and does not account for any response of the climate system. The meaning of this indicator is often misunderstood. In a follow-up paper the effects of current emissions from the transport sectors were analyzed using ΔT as indicator instead (Berntsen and Fuglestvedt, 2008). e. the memory of the climate system is accounted for by the uptake of heat by the ocean.

With such few and disparate results, even to a change in sign, it is difficult to see how a particular value of aviation NOX GWP can be recommended for policy usage. , 2007). Such aviation NOX GWP results highlight the challenges of formulating policy for short-lived species. Here, we attempt to take the analysis a step further using a simple climate model (SCM) and two chemistry transport models (CTMs). One of the fundamental difficulties in calculating a GWP for aviation NOX is that the timescales of responses between O3 and CH4 are very different, such that the CH4 results are often parameterized rather than fully calculated, since long integration times of several CH4 lifetimes (~8-10 years) are required and are computationally expensive.

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