Aviation and the Global Atmosphere

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3. Aviation-Produced Aerosols and Cloudiness

Executive Summary

3.1. Introduction

3.2. Aerosol Emission and Formation in Aircraft Plumes

    3.2.1. Volatile Aerosol Precursors Water Vapor Sulfur Species Chemi-ions Nitrogen Species Hydrocarbons

    3.2.2. Volatile Particles Basic Processes Observations and Modeling of Volatile Particles and Sulfur Conversion

    3.2.3. Soot and Metal Particles Soot Metal Particles

    3.2.4. Contrail and Ice Particle Formation Formation Conditions and Observations Freezing of Contrail Particles

3.3. Regional and Global-Scale Impact of Aviation on Aerosols

    3.3.1. Global Aircraft Emissions and Aerosol Sources

    3.3.2. Sulfate Aerosol Stratosphere Troposphere Differences between the Upper Troposphere and Lower Stratosphere

    3.3.3. Observations of Aviation-Produced Aerosol and Sulfate Aerosol Changes

    3.3.4. Modeling Sulfate Aerosol Perturbations Caused by Aircraft Subsonic Aircraft Supersonic Aircraft

    3.3.5. Soot

    3.3.6. Polar Stratospheric Clouds and Aircraft Emissions

3.4. Contrail Occurrence and Persistence and Impact of Aircraft Exhaust on Cirrus

    3.4.1. Cirrus and Contrails

    3.4.2. Cirrus and Contrail Models

    3.4.3. Contrail Occurrence

    3.4.4. Contrail Properties

    3.4.5. Impact of Aircraft Exhaust on Cirrus Clouds and Related Properties

3.5. Long-Term Changes in Observed Cloudiness and Cloud-Related Parameters

    3.5.1. Changes in the Occurrence and Cover of Cirrus Clouds Surface Observations ISCCP Observations HIRS Observations SAGE Observations Upper Bound for Aviation-Induced Changes in Cirrus Clouds

    3.5.2. Changes in Other Climate Parameters Sunshine Duration and Surface Radiation Temperature

    3.5.3. Limitations in Observed Climate Changes

3.6. Radiative Properties of Aerosols, Contrails, and Cirrus Clouds

    3.6.1. Direct Radiative Impact of Aerosols

    3.6.2. Radiative Properties of Cirrus Clouds

    3.6.3. Radiative Properties of Contrail Clouds

    3.6.4. Radiative Forcing of Line-Shaped Contrail Cirrus

    3.6.5. Radiative Impact of Additional or Changed Cirrus and Other Indirect Cloud Effects

3.7. Parameters of Future Changes in Aircraft-Produced Aerosol and Cloudiness

    3.7.1. Changes in Climate Parameters

    3.7.2. Changes in Subsonic Aircraft

    3.7.3. Expected Changes for Supersonic Aircraft

    3.7.4. Mitigation Options



Lead Authors:
S. Ackerman, P. Artaxo, O. Boucher, M.Y. Danilin, B. K�rcher, P. Minnis,
T. Nakajima, O.B. Toon

J.K. Ayers, T.K. Berntsen, P.S. Connell, F.J. Dentener, D.R. Doelling,
A. D�pelheuer, E.L. Fleming, K. Gierens, C.H. Jackman, H. J�ger, E.J. Jensen,
G.S. Kent, I. K�hler, R. Meerk�tter, J.E. Penner, G. Pitari, M.J. Prather,
J. Str�m, Y. Tsushima, C.J. Weaver, D.K. Weisenstein

Review Editor:
K.-N. Liou

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