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Climate Shocks and Migration: An Agent-Based Modeling Approach
Barbara Entwisle1, Nathalie E Williams2, Ashton M Verdery3
1Office of the Vice Chancellor for Research, University of North Carolina at Chapel Hill, USA; Carolina Population Center, University of North Carolina at Chapel Hill, USA; Department of Sociology, University of North Carolina at Chapel Hill, USA.
Abstract:
This is a study of migration responses to climate shocks. We construct an agent-based model that incorporates dynamic linkages between demographic behaviors, such as migration, marriage, and births, and agriculture and land use, which depend on rainfall patterns. The rules and parameterization of our model are empirically derived from qualitative and quantitative analyses of a well-studied demographic field site, Nang Rong district, Northeast Thailand. With this model, we simulate patterns of migration under four weather regimes in a rice economy: 1) a reference, 'normal' scenario; 2) seven years of unusually wet weather; 3) seven years of unusually dry weather; and 4) seven years of extremely variable weather. Results show relatively small impacts on migration. Experiments with the model show that existing high migration rates and strong selection factors, which are unaffected by climate change, are likely responsible for the weak migration response.
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