Quantification of methane sources in the Athabasca Oil Sands Region of Alberta by aircraft mass balance - Baray, S.; Darlington, A.; Gordon, M.; Hayden, K. L.; Leithead, A.; Li, S.-M.; Liu, P. S. K.; Mittermeier, R. L.; Moussa, S. G.; O'Brien, J.; Staebler, R.; Wolde, M.; et al. (Atmos. Chem. Phys., 2018)