Articles | Volume 10, issue 2
https://doi.org/10.5194/gmd-10-571-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/gmd-10-571-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Half a degree additional warming, prognosis and projected impacts (HAPPI): background and experimental design
Environmental Change Institute, School of Geography and the Environment, Oxford University, Oxford, UK
now at: School of Geographical Sciences, University of Bristol, Bristol, UK
Krishna AchutaRao
Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi 110016, India
Myles Allen
Environmental Change Institute, School of Geography and the Environment, Oxford University, Oxford, UK
Atmospheric, Oceanic and Planetary Physics (AOPP), Oxford University, Oxford, UK
Ingo Bethke
Uni Research Climate, Bjerknes Centre for Climate Research, Bergen, Norway
Urs Beyerle
ETH Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland
Andrew Ciavarella
Met Office Hadley Centre for Climate Science and Services, Exeter, UK
Piers M. Forster
School of Earth and Environment, University of Leeds, Leeds, UK
Jan Fuglestvedt
Center for International Climate and Environmental Research – Oslo (CICERO),
PO Box 1129 Blindern, 0318 Oslo, Norway
Nathan Gillett
Canadian Centre for Climate Modelling and Analysis, Environment and
Climate Change Canada, University of Victoria, Victoria, V8W 2Y2, Canada
Karsten Haustein
Environmental Change Institute, School of Geography and the Environment, Oxford University, Oxford, UK
William Ingram
Atmospheric, Oceanic and Planetary Physics (AOPP), Oxford University, Oxford, UK
Met Office Hadley Centre for Climate Science and Services, Exeter, UK
Trond Iversen
Norwegian Meteorological Institute, Oslo, Norway
Viatcheslav Kharin
Canadian Centre for Climate Modelling and Analysis, Environment and
Climate Change Canada, University of Victoria, Victoria, V8W 2Y2, Canada
Nicholas Klingaman
National Centre for Atmospheric Science – Climate,
Department of Meteorology, University of Reading, Reading, UK
Neil Massey
Environmental Change Institute, School of Geography and the Environment, Oxford University, Oxford, UK
Erich Fischer
ETH Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland
Carl-Friedrich Schleussner
Climate Analytics, Berlin, Germany
Potsdam Institute for Climate Impact Research, Potsdam, Germany
John Scinocca
Canadian Centre for Climate Modelling and Analysis, Environment and
Climate Change Canada, University of Victoria, Victoria, V8W 2Y2, Canada
Øyvind Seland
Norwegian Meteorological Institute, Oslo, Norway
Hideo Shiogama
Center for Global Environmental Research, National Institute for
Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
Emily Shuckburgh
British Antarctic Survey (BAS), High Cross, Madingley Road, Cambridge, UK
Sarah Sparrow
Oxford e-Research Centre (OeRC), University of Oxford, Oxford, UK
Dáithí Stone
Lawrence Berkeley National Laboratory, Berkeley, CA, USA
Peter Uhe
Oxford e-Research Centre (OeRC), University of Oxford, Oxford, UK
Environmental Change Institute, School of Geography and the Environment, Oxford University, Oxford, UK
David Wallom
Oxford e-Research Centre (OeRC), University of Oxford, Oxford, UK
Michael Wehner
Lawrence Berkeley National Laboratory, Berkeley, CA, USA
Rashyd Zaaboul
International Center for Biosaline Agriculture, P.O. Box 14660 Dubai, UAE
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Latest update: 02 Dec 2025
Short summary
This paper provides an experimental design to assess impacts of a world that is 1.5 °C warmer than at pre-industrial levels. The design is a new way to approach impacts from the climate community, and aims to answer questions related to the recent Paris Agreement. In particular the paper provides a method for studying extreme events under relatively high mitigation scenarios.
This paper provides an experimental design to assess impacts of a world that is 1.5 °C warmer...