Land-use - GCAM: Difference between revisions
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In GCAM, the model data for the agriculture and land use parts of the model comprises >300 subregions in terms of land use, formed by subdividing each of GCAM’s 32 global geo-political regions into water basins. Within each of these subregions, land is categorized into approximately a dozen types based on cover and use. Some of these types, such as tundra and desert, are not considered arable. Among arable land types, further divisions are made for lands historically in non-commercial uses such as forests and grasslands as well as commercial forestlands and croplands. Production of approximately twenty crops is currently modeled, with yields of each specific to each of the subregions and management types. For each crop, we include four different management types (with and without irrigation, high and low fertilizer). The model is designed to allow specification of different options for future crop management for each crop in each subregion [http://jgcri.github.io/gcam-doc/aglu.html <nowiki>[1]</nowiki>]. | |||
Revision as of 22:05, 18 August 2020
Note: The documentation of GCAM is 'under review' and is not yet 'published'!| Corresponding documentation | |
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| Previous versions | |
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| 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. |
In GCAM, the model data for the agriculture and land use parts of the model comprises >300 subregions in terms of land use, formed by subdividing each of GCAM’s 32 global geo-political regions into water basins. Within each of these subregions, land is categorized into approximately a dozen types based on cover and use. Some of these types, such as tundra and desert, are not considered arable. Among arable land types, further divisions are made for lands historically in non-commercial uses such as forests and grasslands as well as commercial forestlands and croplands. Production of approximately twenty crops is currently modeled, with yields of each specific to each of the subregions and management types. For each crop, we include four different management types (with and without irrigation, high and low fertilizer). The model is designed to allow specification of different options for future crop management for each crop in each subregion [1].