Airborne observations of far-infrared upwelling radiance in the Arctic - Libois, Q.; Ivanescu, L.; Blanchet, J.-P.; Schulz, H.; Bozem, H.; Leaitch, W. R.; Burkart, J.; Abbatt, J. P. D.; Herber, A. B.; Aliabadi, A. A.; Girard, É. (Atmos. Chem. Phys., 2016)