Parameter: |
Maximum methane production capacity = 0.24 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 |
Parameter: |
Methane conversion factor = 0.04 |
Reference: |
Wirth, T. (2015). Data request between CARB and Tom Wirth, US Environmental Protection Agency, December 2015. |
Parameter: |
Proportion in manure management system = 0.0913 |
Reference: |
Wirth, T. (2015). Data request between CARB and Tom Wirth, US Environmental Protection Agency, December 2015. |
Parameter: |
Total population = 1,754,995 head |
Reference: |
USDA and CDFA, various years. The USDA agriculturlal census provides statewide milking cow populations every five years (2002, 2007, 2012). The milking cow population for intervening years are interpolated from CDFA growth profiles for non-census years. https://www.agcensus.usda.gov/Publications/ |
Parameter: |
Volatile solids production rate = 2,534 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 |
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 |
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 |