During the development phase, the IPCC Expert Meeting Towards New Scenarios for Analysis of Emissions, Climate Change, Impacts, and Response Strategies (Noordwijkerhout, The Netherlands, 19-21 September, 2007) called for the organization of a meeting of the integrated assessment and impacts and adaptation communities to develop a joint strategy for storyline development. The need for such a expert meeting was reiterated by the Task Group established by the IPCC during its 30th session in Antalya, Turkey (21-23 April, 2009) to facilitate the catalytic role of the IPCC.
The RCPs and associated climate model simulations are envisioned to be complemented by a "library of socioeconomic scenarios and storylines" to inform impacts and adaptation analyses and IAM emission trajectories in ways that are mutually consistent. While each RCP was generated by an IAM driven by a set of assumptions about future socioeconomic development, technology, and policy, many other alternative sets of assumptions could result in similar concentration/radiative forcing pathways. This flexibility is an intentional and innovative feature of the RCP process. However, the assumptions chosen can significantly affect the outcomes of impacts and adaptation projections and analyses. Consistent scenario definitions of baseline and mitigation scenarios are critical to ensure comparability across studies that will be assessed in the IPCC Fifth Assessment Report (AR5). An IPCC expert meeting involving the relevant communities engaged with the scenario development will address these issues.
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