Last reviewed on 10-02-2020

Documentation of California's Greenhouse Gas Inventory (13th Edition - Last updated on 10-15-2020)

♦ Category: Agriculture, Forestry and Other Land Use

IPCC: 3A2aii - Livestock - Manure Management - Cattle - Other Cattle
Sector: Agriculture & Forestry : Manure Management : Cattle : Liquid/slurry

♦ Activity: Livestock population - Feedlot - steers 500+ lbs

♦ Greenhouse gas: Methane ( CH4 )

► Year 2003 —

● Greenhouse gas emission estimate —

Amount: 135.28 tonnes of CH4 Emitted (3,382 tonnes CO2 Eq.)
Basis: Calculation
Calculation: [Livestock population] * [Volatile solids production rate] * [Methane conversion factor] * [Maximum methane production capacity] * [Methane density]
Reference: USEPA (2013). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2011. U.S. Environmental Protection Agency. Annex 3.11: Methodology for Estimating CH4 and N2O Emissions from Manure Management. https://www.epa.gov/sites/production/files/2015-12/documents/us-ghg-inventory-2013-annexes.pdf#https://www.epa.gov/sites/production/files/2015-12/documents/us-ghg-inventory-2013-annexes.pdf

● Activity level used in calculations —

Activity: Livestock population = 2,211 head of Feedlot - steers 500+ lbs
Basis: Calculation
Calculation: [Total population] * [Proportion in manure management system]
Reference: ARB (2016). Technical support document on GHG inventory methodologies for the 2000-2014 inventory. See discussion of emissions from manure management available at: https://ww3.arb.ca.gov/cc/inventory/pubs/reports/2000_2014/ghg_inventory_00-14_technical_support_document.pdf#https://ww3.arb.ca.gov/cc/inventory/pubs/reports/2000_2014/ghg_inventory_00-14_technical_support_document.pdf
Reference: Not Applicable.

● Parameters and Constants used in calculations —

Parameter: Maximum methane production capacity = 0.33 m3 / kg
Reference: USEPA (2013). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2011. U.S. Environmental Protection Agency. Annex 3.11: Methodology for Estimating CH4 and N2O Emissions from Manure Management. https://www.epa.gov/sites/production/files/2015-12/documents/us-ghg-inventory-2013-annexes.pdf#https://www.epa.gov/sites/production/files/2015-12/documents/us-ghg-inventory-2013-annexes.pdf
Parameter: Methane conversion factor = 0.415
Reference: Wirth, T. (2015). Data request between CARB and Tom Wirth, US Environmental Protection Agency, December 2015.
Parameter: Proportion in manure management system = 0.0128
Reference: Wirth, T. (2015). Data request between CARB and Tom Wirth, US Environmental Protection Agency, December 2015.
Parameter: Total population = 172,292 head
Reference: Wirth, T. (2015). Data request between CARB and Tom Wirth, US Environmental Protection Agency, December 2015.
Parameter: Volatile solids production rate = 674 kg / year
Reference: Wirth, T. (2015). Data request between CARB and Tom Wirth, US Environmental Protection Agency, December 2015.
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://www.usno.navy.mil/USNO/astronomical-applications/astronomical-information-center/leap-years#http://www.usno.navy.mil/USNO/astronomical-applications/astronomical-information-center/leap-years
Constant: Methane density = 662 g / m3
Reference: USEPA (2013). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2011. U.S. Environmental Protection Agency. Annex 3.11: Methodology for Estimating CH4 and N2O Emissions from Manure Management. https://www.epa.gov/sites/production/files/2015-12/documents/us-ghg-inventory-2013-annexes.pdf#https://www.epa.gov/sites/production/files/2015-12/documents/us-ghg-inventory-2013-annexes.pdf
Constant: Global warming potential of CH4 = 25
Reference: IPCC (2007). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Solomon S., Qin D., Manning M., Chen Z., Marquis M., Averyt K.B., Tignor M., and Miller H.L. (eds.). #http://www.ipcc.ch/publications_and_data/publications_ipcc_fourth_assessment_report_synthesis_report.htm

● Greenhouse gas emitted per unit activity (derived from values listed above) —

Amount: 61,185 g (i.e. 61.19 kg) of CH4 per head of Feedlot - steers 500+ lbs
1,529,634 g (i.e. 1.53 tonnes) of CO2eq. per head of Feedlot - steers 500+ lbs