CO<sub>2</sub>, NO<sub><i>x</i></sub>, and Particle Emissions from Aircraft and Support Activities at a Regional Airport

2012-10-16T00:00:00Z (GMT) by Michael E. Klapmeyer Linsey C. Marr
The goal of this research was to quantify emissions of carbon dioxide (CO<sub>2</sub>), nitrogen oxides (NO<sub><i>x</i></sub>), particle number, and black carbon (BC) from in-use aircraft and related activity at a regional airport. Pollutant concentrations were measured adjacent to the airfield and passenger terminal at the Roanoke Regional Airport in Virginia. Observed NO<sub><i>x</i></sub> emission indices (EIs) for jet-powered, commuter aircraft were generally lower than those contained in the International Civil Aviation Organization databank for both taxi (same as idle) and takeoff engine settings. NO<sub><i>x</i></sub> EIs ranged from 1.9 to 3.7 g (kg fuel)<sup>−1</sup> across five types of aircraft during taxiing, whereas EIs were consistently higher, 8.8–20.6 g (kg fuel)<sup>−1</sup>, during takeoff. Particle number EIs ranged from 1.4 × 10<sup>16</sup> to 7.1 × 10<sup>16</sup> (kg fuel)<sup>−1</sup> and were slightly higher in taxi mode than in takeoff mode for four of the five types of aircraft. Diurnal patterns in CO<sub>2</sub> and NO<sub><i>x</i></sub> concentrations were influenced mainly by atmospheric conditions, while patterns in particle number concentrations were attributable mainly to patterns in aircraft activity. CO<sub>2</sub> and NO<sub><i>x</i></sub> fluxes measured by eddy covariance were higher at the terminal than at the airfield and were lower than found in urban areas.