Presenters-0458
From CSDMS
CSDMS 2020: Linking Ecosphere and Geosphere
GCAM and Demeter: A global, integrated human-Earth systems perspective to modeling land projections
Abstract
Researchers and decision makers are increasingly interested in understanding the many ways in which human and Earth systems interact with one another, at scales from local (e.g., a city) to regional to global. For example, how might changes in population, income, or technology cost alter crop production, energy demand, or water withdrawals? How do changes in one region's demand for energy affect energy, water, and land in other regions? This session will focus on two models – GCAM and Demeter – that provide the capability to address these types of questions.
GCAM is an open-source, global, market equilibrium model that represents the linkages between energy, water, land, climate, and economic systems (Calvin et al. 2019). A strength of GCAM is that it runs fast and can be used to explore, and quantify the uncertainty in, a large number of alternate future scenarios while accounting for multisector, human-Earth system dynamics. One of GCAM’s many outputs is projected land cover/use by subregion. Subregional projections provide context and can be used to understand regional land dynamics; however, Earth System Models (ESMs) generally require gridded representations of land at finer scales. Demeter, a land use and land cover disaggregation model, was created to provide this service (Vernon et al. 2018). Demeter directly ingests land projections from GCAM and creates gridded products that match the desired resolution and land class requirements of the user.
This clinic will introduce both GCAM and Demeter at a high-level. We will also provide a hands-on walk through for a reference case so attendees can become familiar with setting-up and running these two models. Our goal will be for attendees to leave the clinic with an understanding of 1) the value of capturing a global perspective when informing subregional and local analysis, 2) possibilities to conduct scenario exploration experiments that capture multisector/scale dynamics, 3) a hands-on experience with GCAM and Demeter, and 4) key model assumption drivers and simulated model results available.
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