Guidebook on Preparing Airport Greenhouse Gas Emissions Inventories (2009) / Chapter Skim
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Pages 19-34
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19 This chapter provides instructions on how to calculate GHG emissions and CO2 equivalencies. The sections are arranged by source with emissions calculations followed by calculation procedures for creating CO2 equivalencies.
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• Method 1: Use fuel sales data for the airport to calculate total emissions for all departure flights. Fuel sales should represent Jet A (or other jet fuels)
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Similar to CO2 calculation, emissions of CH4 and N2O can be calculated using the following generic emission factors provided by the USEPA's Climate Leaders (USEPAa 2005) , which have been adopted by TCR: • Jet fuel = 0.27 g CH4/gal fuel, • Aviation gasoline = 7.04 g CH4/gal fuel, • Jet fuel = 0.21 g N2O/gal fuel, and • Aviation gasoline = 0.11 g N2O/gal fuel.
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as it approaches the airport on its descent from cruising altitude, lands, and taxis to the gate. The cycle continues as the aircraft taxis back out to the runway for takeoff and climbs out to cross the mixing zone.
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Using Method 2 would improve the Method 1 evaluation by allowing emissions to be reported in a disaggregated form (LTO and cruise)
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reiterated that care must be taken when backcasting and/or forecasting since the data (e.g., source activities, emission factors, etc.) to support these processes may not be very accurate.
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or 5.79 kg CO2/gal fuel (USEPAa 2005) , and • Liquefied natural gas (LNG)
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However, they share common components that are consistent. The following methods are presented in this Guidebook for GAVs: • Method 1: Use average vehicle miles traveled (VMT)
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CO2, with Section 3.4.4 discussing the methodology for the Level 2 and Level 3 pollutants for GAV. 3.4.1 GAV Method 1 Method 1 calculations involving the determination of GHG emissions from GAVs basically determine fuel consumption values for use with the appropriate emission factors.
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The following is a sample calculation for one round trip: 3.4.2 GAV Method 2 Method 2 is similar to Method 1 except that the VMT data are expanded to show a range of vehicle types (e.g., cars, trucks, motorcycles, etc.) and potentially other specific categorizations including vehicle age, mileage, emissions controls, etc.
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The stationary source fuel consumption data can be obtained from various fuel purchase or financial records and should be separated by sources owned by the airport operator versus those owned by tenants. For locations where purchased natural gas or electrical records are not absolutely clear as to the quantities that are the responsibility of the airport operator versus that of the tenants, the following guidance is provided: (1.)
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. • Natural gas (U.S.
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by the airport)
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handle waste (e.g., incineration, disposal, etc.) can be reflected.
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uses the same models and data. Therefore, it is recommended that USEPA's NONROAD2005 (or CARB's OFFROAD2007 for airports in California)
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The 100-year notation in Table 3-2 refers to the corresponding time horizon for the GWP values. In keeping with the general protocols of both IPCC and USEPA, the GWP100 values should always be used.
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