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: 3C4 - Aggregate Sources and Non-CO2 Emissions Sources on Land - Direct N2O Emissions from Managed Soils
Sector: Agriculture & Forestry : Ag Soil Management : Nitrogen Fixation : Direct

♦ Activity: Nitrogen fixed by legume crops -

♦ Greenhouse gas: Nitrous oxide ( N2O )

► Year 1990 —

● Greenhouse gas emission estimate —

Amount: 3,394 tonnes of N2O Emitted (1,052,276 tonnes CO2 Eq.)
Basis: Calculation
Calculation: [Nitrogen fixed by legume crops] * [Nitrogen emitted as N2O] * [Molecular weight ratio of N2O to N2]
Reference: USEPA (2004). Emission Inventory Improvement Program. Technical Report Series, Volume 8: Estimating Greenhouse Gas Emissions, Chapter 10: Agricultural Soil Management. US Environmental Protection Agency. Washington DC. http://www.epa.gov/ttn/chief/eiip/techreport/volume08/index.html

● Activity level used in calculations —

Activity: Nitrogen fixed by legume crops = 216,050,219,104 g (i.e. 216.05 thousand tonnes)
Basis: Compilation
Reference: ARB (2009). Technical Support Document for California’s Greenhouse Gas Emissions Inventory and 1990 Emissions Level. California Air Resources Board. (March 2009). Available online at: /cc/inventory/doc/methods_v1/ghg_inventory_technical_support_document.pdf

● Parameters and Constants used in calculations —

Parameter: Nitrogen emitted as N2O = 0.01 g / g
Reference: IPCC (2006). 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Prepared by the National Greenhouse Gas Inventories Programme, Eggleston H.S., Buendia L., Miwa K., Ngara T., and Tanabe K. (eds). Volume 2, Chapter 2: Energy. http://www.ipcc-nggip.iges.or.jp/public/2006gl/pdf/2_Volume2/V2_2_Ch2_Stationary_Combustion.pdf
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: 0.0157 g of N2O per g
4.87 g of CO2eq. per g
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