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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-946
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
13 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Statistical Analysis of Contrail to Cirrus Evolution during the Contrail and Cirrus Experiments (CONCERT)
Aurélien Chauvigné1, Olivier Jourdan1, Alfons Schwarzenboeck1, Christophe Gourbeyre1, Christiane Voigt2,3, Hans Schlager2, Stefan Kaufmann2, Stephan Borrmann3,4, Sergej Molleker3,4, Andreas Minikin2,a, Tina Jurkat2, and Ulrich Schumann2 1Laboratoire de Météorologie Physique, UMR 6016 CNRS/Université Clermont Auvergne, Clermont-Ferrand, France
2Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
3Institut für Physik der Atmosphäre, Universität Mainz, Mainz, Germany
4Max-Planck-Institute for Chemistry, Department for Particle Chemistry, Mainz, Germany
anow at: Flugexperimente, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
Abstract. Air traffic affects the cloudiness, and thus the climate, by emitting exhaust gases and particles. The study of the evolution of contrail properties is very challenging due to the complex interplay of vortex dynamics and atmospheric environment (e.g. temperature, supersaturation). Despite substantial progress in recent years, the optical, microphysical, and macrophysical properties of contrails and ambient cirrus during contrail formation and subsequent ageing are still subject to large uncertainties due to instrumental and observational limitations and the large number of variables influencing the contrail life cycle. In this study, various contrail cases corresponding to different aircraft types and atmospheric conditions are investigated using a statistical method based on the in situ optical measurements performed during the CONCERT campaigns 2008 and 2011. These two aircraft campaigns encompass more than 17 aircraft contrail cases. A Principal Component Analysis (PCA) of the angular scattering coefficients measured by the Polar Nephelometer has been implemented in order to classify the sampled ice cloud measurements in 6 clusters representative of different development stages of the contrails (primary wake, young contrail, contrail-cirrus and natural cirrus). Based on the information derived from air traffic control, extinction coefficients, asymmetry coefficients, nitrogen oxide concentrations, relative humidity with respect to ice (RHI) and particle size distributions are analyzed for each cluster to provide a characterization of the evolution of ice-cloud properties during the contrail to cirrus evolution. The PCA demonstrates that contrail optical properties are well suited to identify and discriminate the different contrail growth stages and to provide an independent method for the characterization of the evolution of contrail properties.

Citation: Chauvigné, A., Jourdan, O., Schwarzenboeck, A., Gourbeyre, C., Voigt, C., Schlager, H., Kaufmann, S., Borrmann, S., Molleker, S., Minikin, A., Jurkat, T., and Schumann, U.: Statistical Analysis of Contrail to Cirrus Evolution during the Contrail and Cirrus Experiments (CONCERT), Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-946, in review, 2017.
Aurélien Chauvigné et al.
Aurélien Chauvigné et al.
Aurélien Chauvigné et al.

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Short summary
This paper demonstrates a new form of statistical analysis of contrail to cirrus evolution. Authors show well seperated analyses of the different stage of the contrail's evolution which allow to study their optical, microphysical and chemical properties. This results could be used to develop representative parameterizations of the scattering and geometrical properties of the ice crystals’ shapes and sizes, observed in the visible wavelength range.
This paper demonstrates a new form of statistical analysis of contrail to cirrus evolution....
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