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 GHGenius 3.13 TagsBiodiesel
Crude Oil
GHGenius 3.13
Land Use
 2008 GHGenius Update
 Prepared August 2008
 Download | View Abstract | Hide Abstract
There have been a significant number of changes made to the model. The new version is 3.13. These upgrades have included incorporating more recent forecasts of future changes in the Canadian energy infrastructure, the capability of having a choice of GWPs to make comparisons with other studies and models easier, the ability to report emissions per unit of energy on either a higher or lower heating value basis, much expanded capacity to model oil sands operations, many changes to the land use calculations to make the results more regional specific, and a number of smaller changes. The changes have impacted all of the pathways in the model.

The two largest pieces of work included:
1. GHGenius has had default values for the production of synthetic crude oil by an integrated mining process. More and more synthetic crude oil is being produced by in situ mining (Steam Assisted Gravity Drainage or Cyclic Steam Stimulation), so pathways and default values for these alternate production systems have been added. There is now full flexibility in the model for combining bitumen extraction methods and integrated or stand alone upgraders.
2. A major upgrade of the methodology for calculating land use emissions (direct and indirect).
a. The IPCC 2006 guidance document has some small changes in the sources of N2O that are to be calculated as part of a national inventory. This includes N2O emissions resulting from a loss of soil carbon. This source has been added to the model along with an update of the IPCC default values.
b. An update on the issue of N2O emissions from crops that fix their own nitrogen has been included. There has been an update of the approach included in the model.
c. Environment Canada and Agriculture and Agri-Food Canada have made considerable progress in defining the appropriate regional emission factors for agricultural activities such as fertilizer application, cultivation practices and other land use activities rather than relying on the IPCC Tier 1 values. These emission factors, which are found mostly on sheet W, have now been regionalized.
d. The soil carbon changes calculations in the model have been changed to a more straightforward approach.
e. Within the model we have an above ground carbon offset due to nitrogen fertilization of biomass from fertilizer that is lost offsite. This is not included in the IPCC guidelines. We have modified the model so that this source can be included or excluded from the calculations by the user.
f. A discussion of above and below ground carbon changes has been included. The model has been modified so that the land use assumption for ethanol co-product credits are consistent with the energy and GHG emission credit calculations. A discussion of how to model both the direct and indirect land use changes for the biomass feedstocks in included.

Tags: Biodiesel - Canola - Corn - Crude Oil - Electricity - Ethanol - GHGenius 3.13 - Land Use - Soybeans - Wheat
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