FEEM working papers "Note di lavoro"
2016.042
Date: 10/6/2016

The WITCH 2016 Model - Documentation and Implementation of the Shared Socioeconomic Pathways


Authors:

Johannes Emmerling (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC); Laurent Drouet (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC); Lara Aleluia Reis (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC); Michela Bevione (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC) Loic Berger (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC, Bureau Fédéral du Plan); Valentina Bosetti (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC, Bocconi University); Samuel Carrara (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC); Enrica De Cian (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC); Gauthier De Maere D'Aertrycke (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC, Engie); Tom Longden (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici, University of Technology Sydney); Maurizio Malpede (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC); Giacomo Marangoni (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC); Fabio Sferra (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC, Climate Analytics); Massimo Tavoni (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC, Politecnico di Milano); Jan Witajewski-Baltvilks (Fondazione Eni Enrico Mattei, Centro Euromediterraneo sui Cambiamenti Climatici CMCC, Institute for Structural Research); Petr Havlik (International Institute for Applied Systems Analysis IIASA)

JEL n.: Q54, C63
Keywords: Integrated Assessment Model, SSPs, Climate Change, Scenarios

Abstract

This paper describes the WITCH - World Induced Technical Change Hybrid - model in its structure, calibration, and the implementation of the SSP/RCP scenario implementation. The WITCH model is a regionally disaggregated hard-linked model based on a Ramsey type optimal growth model and a detailed bottom-up energy sector model. A particular focus of the model is the modeling or technical change and RnD investments and the analysis of cooperative and non-cooperative climate policies. Moreover, the WITCH 2016 version now includes land-use change modeling based on the GLOBIOM model, and air pollutants, as well as detailed modeling of the transport sector and the possibility for stochastic modeling. This version has been also used to implement the Shared Socioeconomic Pathways (SSPs) set of scenarios and RCP based climate policies to provide a new set of climate scenarios. In this paper, we describe in detail the mathematical formulation of the WITCH model, the solution method and calibration, as well as the implementation of the  five SSP scenarios. This report therefore provides detailed information for interested users of the model, and for  understanding the implementation of the different “worlds" of the SSP.

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Suggested citation: Emmerling, J., L. Drouet, L. A. Reis,  M. Bevione, L. Berger, V.  Bosetti, S. Carrara, E. De Cian, G. De Maere D'Aertrycke, T. Longden, M. Malpede, G. Marangoni, F. Sferra, M. Tavoni, J. Witajewski-Baltvilks, P. Havlik, (2016), 'The WITCH 2016 Model - Documentation and Implementation of the Shared Socioeconomic Pathways', Nota di Lavoro 42.2016, Milan, Italy: Fondazione Eni Enrico Mattei

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