Last reviewed on November 2, 2011 at 10:05
Documentation of California's Greenhouse Gas Inventory
(First Edition - Last updated on 11/19/2007)
♦ Category: Agriculture, Forestry and Other Land Use
| IPCC: |
3A2aii - Livestock - Manure Management - Cattle - Other Cattle |
| Sector: |
Agriculture & Forestry : Manure Management : Cattle |
♦ Activity: Livestock population - Not on feed - heifers 500+ lbs
♦ Greenhouse gas: Nitrous oxide ( N2O )
► Year 1990 —
● Greenhouse gas emission estimate —
| Amount: |
0 tonne of N2O Emitted (0 tonne CO2 Eq.) |
| Basis: |
Calculation |
| Calculation: |
[Livestock population] * [Proportion of livestock in managed system] * [Typical animal mass] * [Nitrogen excretion rate] * [Average number of days per year] * [State weighted N as N2O emission factor] * [Molecular weight ratio of N2O to N2] |
| Reference: |
USEPA (2007). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2005. United States Environmental Protection Agency. EPA 430-R-07-002. and Annex 3.10: Methodology for Estimating CH4 and N2O Emissions from Manure Management. April 15, 2007. Washington DC. http://www.epa.gov/climatechange/emissions/usgginv_archive.html |
● Activity level used in calculations —
| Activity: |
Livestock population = 234,712 head of Not on feed - heifers 500+ lbs |
| Basis: |
Data |
| Reference: |
Wirth, T. (2007). Personal communication between Neva Lowery of CA Air Resources Board and Tom Wirth, Greenhouse Gas Inventory Source Lead, US Environmental Protection Agency, March 2007. |
● Parameters and Constants used in calculations —
| Parameter: |
Nitrogen Excretion Rate = 0.31 g / kg / day |
| Reference: |
USEPA (2007). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2005. United States Environmental Protection Agency. EPA 430-R-07-002. and Annex 3.10: Methodology for Estimating CH4 and N2O Emissions from Manure Management. April 15, 2007. Washington DC. http://www.epa.gov/climatechange/emissions/usgginv_archive.html |
| Parameter: |
Proportion of livestock in managed system = 0 |
| Reference: |
Wirth, T. (2007). Personal communication between Neva Lowery of CA Air Resources Board and Tom Wirth, Greenhouse Gas Inventory Source Lead, US Environmental Protection Agency, March 2007. |
| Parameter: |
State weighted N as N2O emission factor = 0 g / g |
| Reference: |
Wirth, T. (2007). Personal communication between Neva Lowery of CA Air Resources Board and Tom Wirth, Greenhouse Gas Inventory Source Lead, US Environmental Protection Agency, March 2007. |
| Parameter: |
Typical animal mass = 420 kg / head |
| Reference: |
USEPA (2007). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2005. United States Environmental Protection Agency. EPA 430-R-07-002. and Annex 3.10: Methodology for Estimating CH4 and N2O Emissions from Manure Management. April 15, 2007. Washington DC. http://www.epa.gov/climatechange/emissions/usgginv_archive.html |
| Constant: |
Average number of days per year = 365.2425 day |
| Reference: |
USNO (2004). U.S. Naval Observatory, Astronomical Applications Department, Leap Years. Accessed online at: http://aa.usno.navy.mil/faq/docs/leap_years.php |
| Constant: |
Molecular weight ratio of N2O to N2 = 1.571133815 |
| Reference: |
IUPAC (2006). ATOMIC WEIGHTS OF THE ELEMENTS 2005 (IUPAC TECHNICAL REPORT). Pure Appl. Chem., Vol. 78, No. 11, pp. 2051–2066, 2006. |
| Constant: |
Global warming potential of N2O = 310 |
| 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: |
0 g of N2O per head of Not on feed - heifers 500+ lbs
0 g of CO2eq. per head of Not on feed - heifers 500+ lbs |