Role of aircraft soot emissions in contrail formation

The susceptibility of microphysical properties of young contrails to changes in aircraft soot emissions is studied with a microphysical plume model. Liquid plume and ambient particles compete with exhaust soot particles for the formation of contrail ice particles, assuming that soot particles are ac...

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Bibliographic Details
Published in:Geophysical research letters 2009-01, Vol.36 (1), p.n/a
Main Authors: Kärcher, B., Yu, F.
Format: Article
Language:English
Subjects:
Aircraft
Atmospheric aerosols
Atmospheric sciences
Chemistry
climate
Clouds
contrails
Earth sciences
Earth, ocean, space
Emissions
Exact sciences and technology
Freezing
Ice formation
Optical analysis
Physics
Soot
Sulfur
Troposphere
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Summary:The susceptibility of microphysical properties of young contrails to changes in aircraft soot emissions is studied with a microphysical plume model. Liquid plume and ambient particles compete with exhaust soot particles for the formation of contrail ice particles, assuming that soot particles are activated into water droplets prior to homogeneous freezing. Soot controls ice formation in contrails for high number emission indices including the range of current global fleet values. A fivefold reduction of soot emissions from average levels of 5 × 1014 − 1015 (kg‐fuel)−1 approximately halves the initial contrail visible optical depth. Further soot reduction reverses this trend at temperatures well below the formation threshold temperature unless emissions of sulfur and organics are cut substantially. Whether and to which degree reductions in soot emissions help mitigate the contrail climate impact depends on subsequent aircraft wake vortex processing of contrails and their development into contrail cirrus.
ISSN:0094-8276
1944-8007
DOI:10.1029/2008GL036649