Spatial dimension - GCAM: Difference between revisions

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The GCAM Core represents the entire world, but it is constructed with different levels of resolution for each of these different systems (see Figure 2). In the current release version of GCAM, the energy-economy system operates at 32 regions globally, land is divided into >300 subregions, and water is tracked for 233 basins worldwide. The Earth system module operates at a global scale. [http://jgcri.github.io/gcam-doc/overview.html link]{{ModelDocumentationTemplate
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The GCAM Core represents the entire world, but it is constructed with different levels of resolution for each different system. In the current release version of GCAM, the energy-economy system operates at 32 regions globally, land is divided into 384 subregions, and water is tracked for 235 basins worldwide. The Earth system module operates at a global scale. See [https://jgcri.github.io/gcam-doc/overview.html#overview-of-integrated-dynamics-in-the-gcam-core Overview of Integrated Dynamics in the GCAM Core] and [https://jgcri.github.io/gcam-doc/common_assumptions.html Common Assumptions]. 
{| class="wikitable"
|+<small>Spatial scale of systems in release version of GCAM</small>
!GCAM Component
!Geospatial Resolution
|-
|Macro-Economy
|32 Geopolitical Regions
|-
|Energy System
|32 Geopolitical Regions
|-
|Land System
|384 subregions
|-
|Water Supplies
|235 Hydrologic Basins
|-
|Physical Earth System
|Global
|}

Latest revision as of 20:27, 10 October 2023

Alert-warning.png Note: The documentation of GCAM is 'under review' and is not yet 'published'!

Model Documentation - GCAM

Corresponding documentation
Previous versions
No previous version available
Model information
Model link
Institution Pacific Northwest National Laboratory, Joint Global Change Research Institute (PNNL, JGCRI), USA, https://www.pnnl.gov/projects/jgcri.
Solution concept General equilibrium (closed economy)GCAM solves all energy, water, and land markets simultaneously
Solution method Recursive dynamic solution method
Anticipation GCAM is a dynamic recursive model, meaning that decision-makers do not know the future when making a decision today. After it solves each period, the model then uses the resulting state of the world, including the consequences of decisions made in that period - such as resource depletion, capital stock retirements and installations, and changes to the landscape - and then moves to the next time step and performs the same exercise. For long-lived investments, decision-makers may account for future profit streams, but those estimates would be based on current prices. For some parts of the model, economic agents use prior experience to form expectations based on multi-period experiences.

The GCAM Core represents the entire world, but it is constructed with different levels of resolution for each different system. In the current release version of GCAM, the energy-economy system operates at 32 regions globally, land is divided into 384 subregions, and water is tracked for 235 basins worldwide. The Earth system module operates at a global scale. See Overview of Integrated Dynamics in the GCAM Core and Common Assumptions.

Spatial scale of systems in release version of GCAM
GCAM Component Geospatial Resolution
Macro-Economy 32 Geopolitical Regions
Energy System 32 Geopolitical Regions
Land System 384 subregions
Water Supplies 235 Hydrologic Basins
Physical Earth System Global
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