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Aviation and the Global Atmosphere

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<strong>Aviation</strong> <strong>and</strong> <strong>the</strong> <strong>Global</strong> <strong>Atmosphere</strong><br />

humidity in <strong>the</strong> plume exceeds 100%. A few ice particles may nucleate below liquid water saturation (dashed<br />

arrow). Well below threshold formation temperatures, homogeneous freezing of volatile droplets from <strong>the</strong><br />

nucleation mode (in which case ice crystals initially contain no soot inclusions) is thought to dominate over sootinduced<br />

immersion freezing in <strong>the</strong> formation of contrail ice particles. The hexagon is a schematic representation<br />

of ice particle shapes that are close to spherical in young contrails but may vary in aging contrails. Soot cores<br />

may reside inside <strong>the</strong> ice particles or be attached at <strong>the</strong>ir surfaces.<br />

Table of contents<br />

O<strong>the</strong>r reports in this collection<br />

Back to text<br />

http://www.ipcc.ch/ipccreports/sres/aviation/avf3-5.htm (2 von 2)08.05.2008 02:45:13

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