Conference Agenda
Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).
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Thematic Session 8: Carbon Dioxide Removal: from economics to policy design, and back (HYBRID) Location: Auditorium M: Jan Mossin Session Chair: Pietro Andreoni, Politecnico di Milano | |
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Integrated assessment of marine carbon dioxide removal by ocean alkalinity enhancement 1: Kiel Institute for the World Economy, Germany; 2: German Centre for Integrative Biodiversity Research (iDiv), Germany; 3: NORCE Research, Bergen, Norway Compliance with ambitious temperature targets as in the Paris Agreement will require alongside deep emission cuts also large-scale deployment of carbon dioxide removal (CDR). This holds, in particular, true for the second half of the century where CO2 emissions have to become net negative to compensate for non-CO2 greenhouse gas emissions. Currently, future scenarios focus on terrestrial CDR, like for example bioenergy with carbon capture and storage (BECCS) and afforestation. While earth-system modelers already implement ocean-based CDR methods, current integrated assessment models are not capable of properly analyzing these methods. Here, we aim to augment the integrated assessment model DICE to numerically evaluate ocean alkalinity enhancement in an economic assessment framework. We replace the carbon cycle in DICE with the Bolin and Eriksson Adjusted Model (BEAM) carbon cycle which includes basic ocean chemistry. Furthermore, we adjust BEAM such that ocean alkalinity is no longer a parameter but a state variable that can be increased with costly alkalinity enhancement. The cost of alkalinity enhancement captures the effectiveness of different alkaline materials to increase ocean alkalinity, in dependence of different methods of deployment. We investigate optimal ocean alkalinity enhancement scenarios under a cost effectiveness approach, i.e. temperature targets. We also investigate how the cost-effective solution changes if limits for ocean acidification are included. | |