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Table 2

Indianapolis whole-city CO2 and CH4 emission estimates published to date. Aircraft mass balance data are averages from the following flight days: 2008 (3/28, 4/2, 2/14, 2/15, 4/21, 11/28, 12/20); 2009 (1/7); 2011 (3/1, 4/29, 6/1, 6/30, 7/12); 2012 (11/8); 2014 (11/13, 11/14, 11/17, 11/19, 11/20, 11/21, 11/25, 12/1, 12/3). The three summer dates in 2011 are excluded from the CO2 aircraft mass balance results due to complications with background conditions in the summer. The confidence interval for the aircraft mass balance average is twice the standard error of the individual estimates. Aircraft mass balance flux estimates represent average emissions from a time window starting few hours before the midday to afternoon flight times. Tower inversion and inventory emissions represent best estimates averaged over the entire time periods noted in the table, including day and night. The area encompassed by the airborne mass balance estimates includes most of the city, but varies somewhat from flight to flight. The tower inversion and inventory estimates represent an 87 × 87 km2 region centered on the city. DOI: https://doi.org/10.1525/elementa.147.t2

Aircraft mass balanceTower inversionInventory product

 
Urban CO2 emissions (mol s–114,000 22,600 18,200 
Uncertainty (mol s–13,300 (95% CI) 20,800 – 23,400 (25th–75th percentile) Not yet estimated 
Time domain 2008–9, 2011–12, 2014. Sept. 2012 – Apr. 2013. Sept. 2012 – Apr. 2013 
References Cambaliza et al, 2014, 2015; Heimburger et al, 2017. Lauvaux et al., 2016  Gurney et al., 2012  
Urban CH4 emissions (mol s–1103 160 57 
Uncertainty (95% CI) (mol s–127 147 – 174 30 – 107 
Time, space domain 2008–9, 2011–12, 2014 Sept. 2012 – Apr. 2013 2013 
References Cambaliza et al., 2014, 2015; Heimburger et al, 2017. Lamb et al., 2016  Lamb et al., 2016  
Aircraft mass balanceTower inversionInventory product

 
Urban CO2 emissions (mol s–114,000 22,600 18,200 
Uncertainty (mol s–13,300 (95% CI) 20,800 – 23,400 (25th–75th percentile) Not yet estimated 
Time domain 2008–9, 2011–12, 2014. Sept. 2012 – Apr. 2013. Sept. 2012 – Apr. 2013 
References Cambaliza et al, 2014, 2015; Heimburger et al, 2017. Lauvaux et al., 2016  Gurney et al., 2012  
Urban CH4 emissions (mol s–1103 160 57 
Uncertainty (95% CI) (mol s–127 147 – 174 30 – 107 
Time, space domain 2008–9, 2011–12, 2014 Sept. 2012 – Apr. 2013 2013 
References Cambaliza et al., 2014, 2015; Heimburger et al, 2017. Lamb et al., 2016  Lamb et al., 2016  
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