Half a degree additional warming, prognosis and projected impacts (HAPPI): background and experimental design

Author:

Mitchell DanielORCID,AchutaRao Krishna,Allen Myles,Bethke IngoORCID,Beyerle UrsORCID,Ciavarella Andrew,Forster Piers M.,Fuglestvedt Jan,Gillett NathanORCID,Haustein KarstenORCID,Ingram William,Iversen TrondORCID,Kharin ViatcheslavORCID,Klingaman NicholasORCID,Massey Neil,Fischer ErichORCID,Schleussner Carl-FriedrichORCID,Scinocca John,Seland Øyvind,Shiogama Hideo,Shuckburgh Emily,Sparrow SarahORCID,Stone DáithíORCID,Uhe Peter,Wallom DavidORCID,Wehner MichaelORCID,Zaaboul Rashyd

Abstract

Abstract. The Intergovernmental Panel on Climate Change (IPCC) has accepted the invitation from the UNFCCC to provide a special report on the impacts of global warming of 1.5 °C above pre-industrial levels and on related global greenhouse-gas emission pathways. Many current experiments in, for example, the Coupled Model Inter-comparison Project (CMIP), are not specifically designed for informing this report. Here, we document the design of the half a degree additional warming, projections, prognosis and impacts (HAPPI) experiment. HAPPI provides a framework for the generation of climate data describing how the climate, and in particular extreme weather, might differ from the present day in worlds that are 1.5 and 2.0 °C warmer than pre-industrial conditions. Output from participating climate models includes variables frequently used by a range of impact models. The key challenge is to separate the impact of an additional approximately half degree of warming from uncertainty in climate model responses and internal climate variability that dominate CMIP-style experiments under low-emission scenarios.Large ensembles of simulations (>  50 members) of atmosphere-only models for three time slices are proposed, each a decade in length: the first being the most recent observed 10-year period (2006–2015), the second two being estimates of a similar decade but under 1.5 and 2 °C conditions a century in the future. We use the representative concentration pathway 2.6 (RCP2.6) to provide the model boundary conditions for the 1.5 °C scenario, and a weighted combination of RCP2.6 and RCP4.5 for the 2 °C scenario.

Funder

Natural Environment Research Council

Publisher

Copernicus GmbH

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