Last reviewed on February 25, 2013 at 15:57
Documentation of California's Greenhouse Gas Inventory
(5th Edition - Last updated on 02/19/2013)
♦ Category: Energy
| IPCC: |
1A3bi - Fuel Combustion Activities - Transport - Road Transportation - Cars |
| Sector: |
Transportation : On Road : Light-duty Vehicles : Passenger Cars |
♦ Activity: Fuel combustion - Ethanol
♦ Greenhouse gas: Methane ( CH4 )
► Year 2000 —
● Greenhouse gas emission estimate —
| Amount: |
50.56 tonnes of CH4 Emitted (1,062 tonnes CO2 Eq.) |
| Basis: |
Calculation |
| Calculation: |
[EMFAC CH4 emission] * ([Fuel sales] / [EMFAC total fuel combustion]) * [Fraction of fuel mix] |
| Reference: |
ARB (2012). Upcoming technical support document on GHG inventory methodologies for the 2000-2010 inventory. Specific questions may be directed to ARB staff, see: http://www.arb.ca.gov/cc/inventory/contacts.htm |
● Activity level used in calculations —
| Activity: |
Fuel combustion = 26,836,151 gal of Ethanol |
| Basis: |
Calculation |
| Calculation: |
[EMFAC category fuel combustion] * ([Fuel sales] / [EMFAC total fuel combustion]) * [Fraction of fuel mix] |
| Reference: |
ARB (2012). Upcoming technical support document on GHG inventory methodologies for the 2000-2010 inventory. Specific questions may be directed to ARB staff, see: http://www.arb.ca.gov/cc/inventory/contacts.htm |
| Reference: |
Not Applicable. |
● Parameters and Constants used in calculations —
| Parameter: |
EMFAC category fuel combustion = 7,119,355,600 gal |
| Reference: |
ARB (2007). The California Air Resources Board's EMission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars to heavy-duty trucks, operating on highways, freeways and local roads in California. Model and documentation available online at: http://www.arb.ca.gov/msei/onroad/latest_version.htm |
| Parameter: |
EMFAC CH4 emission = 13,411,754,397 g (i.e. 13.41 thousand tonnes) |
| Reference: |
ARB (2007). The California Air Resources Board's EMission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars to heavy-duty trucks, operating on highways, freeways and local roads in California. Model and documentation available online at: http://www.arb.ca.gov/msei/onroad/latest_version.htm |
| Parameter: |
EMFAC total fuel combustion = 14,355,311,175 gal |
| Reference: |
ARB (2007). The California Air Resources Board's EMission FACtors (EMFAC) model was used to calculate emission rates from all motor vehicles, such as passenger cars to heavy-duty trucks, operating on highways, freeways and local roads in California. Model and documentation available online at: http://www.arb.ca.gov/msei/onroad/latest_version.htm |
| Parameter: |
Fraction of fuel mix = 3.763E-03 |
| Reference: |
ARB (2012). Upcoming technical support document on GHG inventory methodologies for the 2000-2010 inventory. Specific questions may be directed to ARB staff, see: http://www.arb.ca.gov/cc/inventory/contacts.htm |
| Parameter: |
Fuel sales = 14,378,254,190 gal |
| Reference: |
FHWA (various). US Department of Transportation, Federal Highway Administration - Highway Statistics Series. Motor Fuel. Data accessed online at: http://www.fhwa.dot.gov/policy/ohpi/qffuel.cfm |
| Constant: |
Global warming potential of CH4 = 21 |
| Reference: |
IPCC (1996). Second Assessment Report. Climate Change 1995: WG I - The Science of Climate Change. Intergovernmental Panel on Climate Change; J.T. Houghton, L.G. Meira Filho, B.A. Callander, N. Harris, A. Kattenberg, and K. Maskell (eds.); Cambridge University Press. Cambridge, U.K. |
● Greenhouse gas emitted per unit activity —
| Amount: |
1.88 g of CH4 per gal of Ethanol
39.6 g of CO2eq. per gal of Ethanol |
