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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-168
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model experiment description paper
17 Aug 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
The Carbon Dioxide Removal Model Intercomparison Project (CDR-MIP): Rationale and experimental design
David P. Keller1, Andrew Lenton2,3, Vivian Scott4, Naomi E. Vaughan5, Nico Bauer6, Duoying Ji7, Chris D. Jones8, Ben Kravitz9, Helene Muri10, and Kirsten Zickfeld11 1GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany
2CSIRO Oceans and Atmospheres, Hobart, Australia
3Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, Australia
4School of GeoSciences, University of Edinburgh
5Tyndall Centre for Climate Change Research, School of Environmental Sciences, University of East Anglia, Norwich, UK
6Potsdam Institute for Climate Impact Research, Research Domain Sustainable Solutions, 14473 Potsdam, Germany
7College of Global Change and Earth System Science, Beijing Normal University, Beijing, China
8Met Office Hadley Centre, Exeter, UK
9Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, USA
10Department of Geosciences, University of Oslo, Oslo, Norway
11Department of Geography, Simon Fraser University , Burnaby, Canada
Abstract. The recent IPCC reports state that continued anthropogenic greenhouse gas emissions are changing the climate threatening "severe, pervasive and irreversible" impacts. Slow progress in emissions reduction to mitigate climate change is resulting in increased attention on what is called Geoengineering, Climate Engineering, or Climate Intervention – deliberate interventions to counter climate change that seek to either modify the Earth's radiation budget or remove greenhouse gases such as CO2 from the atmosphere. When focused on CO2, the latter of these categories is called Carbon Dioxide Removal (CDR). The majority of future emission scenarios that stay well below 2 °C, and nearly all emission scenarios that do not exceed 1.5 °C warming by the year 2100, require some form of CDR. At present, there is little consensus on the impacts and efficacy of the different types of proposed CDR. To address this need the Carbon Dioxide Removal Model Intercomparison Project (or CDR-MIP) was initiated. This project brings together models of the Earth system in a common framework to explore the potential, impacts, and challenges of CDR. Here, we describe the first set of CDR-MIP experiments that are designed to address questions concerning CDR-induced climate "reversibility", the response of the Earth system to direct atmospheric CO2 removal (direct air capture and storage), and the CDR potential and impacts of afforestation/reforestation, as well as ocean alkalinization.

Citation: Keller, D. P., Lenton, A., Scott, V., Vaughan, N. E., Bauer, N., Ji, D., Jones, C. D., Kravitz, B., Muri, H., and Zickfeld, K.: The Carbon Dioxide Removal Model Intercomparison Project (CDR-MIP): Rationale and experimental design, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-168, in review, 2017.
David P. Keller et al.
David P. Keller et al.
David P. Keller et al.

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Short summary
There is little consensus on the impacts and efficacy of proposed Carbon Dioxide Removal (CDR) methods as a potential means of mitigating climate change. To address this need the Carbon Dioxide Removal Model Intercomparison Project (or CDR-MIP) was initiated. This project brings together models of the Earth system in a common framework to explore the potential, impacts, and challenges of CDR. Here, we describe the first set of CDR-MIP experiments.
There is little consensus on the impacts and efficacy of proposed Carbon Dioxide Removal (CDR)...
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