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(WORK IN PROGRESS. Estimated Completion: Spring 2014)
B. Please use documents and trainings available from ISEE Systems systems for guidance in using the Stella software.
C. Please use this Excel spreadsheet for detailed questions about data, data processing, and data documentation.
The BioLUC model prioritizes land for biofuels over other commodities and generally prioritizes commodity use for food over the use for feed
Because BioLUC is not an economic model the former assumption was implemented so that multiple alternative biofuel scenarios could be run in BioLUC. In essence, the requirement of land for biofuel can be thought of a a policy induced event that can't be circumnavigated.
AP commodity consn
AP food consn
AP net export
AP production
Abandoned
Abandoned Land
Actual Forage Land
Animal Product Inventory
Avg AP Prodn Shortfall
Avg Commodity Prod''n Shortfall
Built Up
Built Up Land
Commodity Inventory
Crop
Crop Land
Crop Land Alloc to Cellulosic Energy Crop
Crop Land Alloc to Fallow
Crop Land Alloc to Fiber
Crop Land Alloc to Other
Crop Land Alloc to VFN
Latent
Latent Land
NPL
Near Pristine Land
Other yield
Population
Set Aside
Set Aside Land
TOTAL desired AP exports
TOTAL desired AP imports
TOTAL desired CP exports
TOTAL desired CP imports
Total AP Prodn Shortfall
VFN yield
animal product demand
commodity crop demand
commodity crop yield
commodity production
crop land forage yield
direct commodity consn
fiber yield
net commodity export
per capita animal product demand
per capita commodity crop demand
potential exports
potential imports
total crop land allocated to all other uses
total crop land allocated to commodities
It is possible using STELLA 10.0.3 to lose control over the mouse when opening the BioLUC model. This can occur under conditions such as the following a) you have multiple monitors b) program such as the windows task manager is open in one monitor b) you launch the model by double-clicking it.
This is a known problem with STELLA, and is scheduled to be fixed in a version subsequent to 10.0.3. This problem does not occur if you first launch STELLA and then open the BioLUC model from the File menu.
A. There can be inconsistency between population and calcualted total commodity crop demand demands in BioLUC. Miscelanouses crop commodities for industry, seed, etc. comes from static disposition data from FAOSTAT and is only implicitly dependent on population levels. In the model, changes in population on not linked to these relatively smaller uses of crop commodities.
The "latent to set aside" and "pristine to set aside" flows are set to zero. If this is intentional, then the documentation should note that these flows are turned off by default and meant to be overridden when users design scenarios.
So called "built-up" land data does not well match actual land that has been built up for human use. The "built-up" land category is generated from the FAOSTAT's Land Resource data's "Other" land category. We were able to remove "abandoned" land from that category, but we could not separate out barren land such as tundra and deserts. Therefore, our "built-up" land category does not include only built-up land. Inflows of land into the "built-up" land category are either based assuming that historic growth is mostly from the building up of land for human uses or that growth should be mirror to similar regions. These two methods were applied in cases of historic growth or decline in the "built-up" land category, respectively. Growth Please see data documentation for additional details about this issue.
Some regions have zero yields for some commodities. BioLUC does not include explicit economic or climate components and dynamics so the zero yields are how BioLUC manages commodities that should not be grown.
(please submit questions to ethan.warner@nrel.gov or create a ticket