The climate impact of aviation aerosols
Article first published online: 6 JUN 2013
©2013. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 40, Issue 11, pages 2785–2789, 16 June 2013
How to Cite
2013), The climate impact of aviation aerosols, Geophys. Res. Lett., 40, 2785–2789, doi:10.1002/grl.50520., and (
- Issue published online: 3 JUL 2013
- Article first published online: 6 JUN 2013
- Accepted manuscript online: 1 MAY 2013 01:31PM EST
- Manuscript Accepted: 28 APR 2013
- Manuscript Revised: 19 APR 2013
- Manuscript Received: 15 MAR 2013
- Aviation Climate Change Research Initiative (ACCRI). Grant Number: DTRT57-10-C-10012
 A comprehensive general circulation model (GCM) is used to estimate the climate impact of aviation emissions of black carbon (BC) and sulfate (SO4) aerosols. Aviation BC is found not to exert significant radiative forcing impacts, when BC nucleating efficiencies in line with observations are used. Sulfate emissions from aircraft are found to alter liquid clouds at altitudes below emission (∼200 hPa); contributing to shortwave cloud brightening through enhanced liquid water path and drop number concentration in major flight corridors, particularly in the N. Atlantic. Global averaged sulfate direct and indirect effects on liquid clouds of 46 mWm−2are larger than the warming effect of aviation induced cloudiness of 16 mWm−2. The net result of including contrail cirrus and aerosol effects is a global averaged cooling of −21±11 mWm−2. These aerosol forcings should be considered with contrails in evaluating the total global impact of aviation on climate.