Atmos. Chem. Phys. Discuss., 12, 25237-25254, 2012
www.atmos-chem-phys-discuss.net/12/25237/2012/
doi:10.5194/acpd-12-25237-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Selected topics on interactions between cirrus clouds and embedded contrails
K. Gierens
1Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany

Abstract. Persistent contrails and natural cirrus clouds often coexist in the upper troposphere and contrails can be embedded within cirrus clouds. The present paper deals with some questions regarding the interaction of cirrus clouds and embedded contrails. I have selected only questions that can be answered by analytical means. I find that (1) the emission index for water vapour is only slightly changed when an aircraft crosses a cirrus cloud, (2) that contrail formation is not affected by an ambient cirrus, (3) that cirrus ice crystals entrained into the trailing wing tip vortex do not efficiently retard the sublimation of contrail ice crystals, and (4) that cirrus can start to dissolve an embedded contrail after a couple of hours by aggregation.

Citation: Gierens, K.: Selected topics on interactions between cirrus clouds and embedded contrails, Atmos. Chem. Phys. Discuss., 12, 25237-25254, doi:10.5194/acpd-12-25237-2012, 2012.
 
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