Abstract
Abstract. We present a suite of new climate model experiment designs for the Geoengineering Model Intercomparison Project (GeoMIP). This set of experiments, named GeoMIP6 (to be consistent with the Coupled Model Intercomparison Project Phase 6), builds on the previous GeoMIP project simulations, and has been expanded to address several further important topics, including key uncertainties in extreme events, the use of geoengineering as part of a portfolio of responses to climate change, and the relatively new idea of cirrus cloud thinning to allow more longwave radiation to escape to space. We discuss experiment designs, as well as the rationale for those designs, showing preliminary results from individual models when available. We also introduce a new feature, called the GeoMIP Testbed, which provides a platform for simulations that will be performed with a few models and subsequently assessed to determine whether the proposed experiment designs will be adopted as core (Tier 1) GeoMIP experiments. This is meant to encourage various stakeholders to propose new targeted experiments that address their key open science questions, with the goal of making GeoMIP more relevant to a broader set of communities.
Highlights
As anthropogenic climate change continues largely unabated, society is exploring research into options for addressing the effects of greenhouse gas emissions
Along with mitigation and adaptation, a further option that is under consideration is geoengineering, a term describing deliberate modification of the climate system to offset the radiative effects of increasing anthropogenic greenhouse gases
As of the writing of this paper, Geoengineering Model Intercomparison Project (GeoMIP) has resulted in 23 peer-reviewed publications; and results from GeoMIP were featured in the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (Boucher et al, 2013), the recent National Academy of Sciences report on SRM, and the final report from the European Transdisciplinary Assessment of Climate Engineering (EuTRACE)
Summary
As anthropogenic climate change continues largely unabated, society is exploring research into options for addressing the effects of greenhouse gas emissions. As of the writing of this paper, GeoMIP has resulted in 23 peer-reviewed publications; and results from GeoMIP were featured in the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (Boucher et al, 2013), the recent National Academy of Sciences report on SRM (solar radiation management; NAS, 2015), and the final report from the European Transdisciplinary Assessment of Climate Engineering (EuTRACE) GeoMIP has been successful in identifying both model commonalities and the effects of different stratospheric aerosol parameterizations on the climate effects of geoengineering (e.g., Berdahl et al, 2014; Yu et al, 2015) These efforts are continuing for sea spray geoengineering experiments (Kravitz et al, 2013a).
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