Marilia Telma Manjate 2/8/2015

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Hello,

How are emissions from CH4 and N2O calculated in the non-energy sector?

I was trying to understand how LEAP calculates emissions from non-energy sector. The emissions from CO2 are the effects loading GWP100[Million TCEq] * (44/12), but, regarding CH4 and N2O, the results are slightly different from this calculations (using the respective expressions GWP100[Million TCEq] * (44/12) / 23 and GWP100[Million TCEq] * (44/12) / 296). Why is this so?

Thank you

Taylor Binnington 2/18/2015
 

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Hi Marilia,

Apologies for my late reply. If I understand your question correctly, the reason you are seeing a small discrepancy between LEAP's calculated GWP and your own calculated GWP values is because you are using different equivalent CO2 potentials for methane and nitrous oxide.

LEAP uses default integrated 100-year GWPs from the IPCC Second Assessment Report, which are the following:

1 tonne CO2 = 1 tonne CO2 eq.
1 tonne CH4 = 21 tonnes CO2 eq.
1 tonne N2O = 310 tonnes CO2 eq.

Note that you can view and edit these values in LEAP's Effects window:

http://www.energycommunity.org/WebHelpPro/Supporting_Screens/Effects_Screen.htm

Hope this helps - and if I misunderstood your question, please clarify exactly how your results are different and what you expected to see from LEAP's calculations.

Taylor