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| Titel |
Large-eddy simulation of contrail evolution in the vortex phase and its interaction with atmospheric turbulence |
| VerfasserIn |
J. Picot, R. Paoli, O. Thouron, D. Cariolle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 13 ; Nr. 15, no. 13 (2015-07-09), S.7369-7389 |
| Datensatznummer |
250119876
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| Publikation (Nr.) |
 copernicus.org/acp-15-7369-2015.pdf |
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| Zusammenfassung |
| In this work, the evolution of contrails in the vortex and
dissipation regimes is studied by means of fully three-dimensional
large-eddy simulation (LES) coupled to a Lagrangian particle
tracking method to treat the ice phase. In this paper, fine-scale
atmospheric turbulence is generated and sustained by means of a
stochastic forcing that mimics the properties of stably stratified
turbulent flows as those occurring in the upper troposphere and lower
stratosphere. The initial flow field is composed of the turbulent
background flow and a wake flow obtained from separate LES of the
jet regime. Atmospheric turbulence is the main driver of the wake
instability and the structure of the resulting wake is sensitive to
the intensity of the perturbations, primarily in the vertical
direction. A stronger turbulence accelerates the onset of the
instability, which results in shorter contrail descent and more
effective mixing in the interior of the plume. However, the
self-induced turbulence that is produced in the wake after the
vortex breakup dominates over background turbulence until the end
of the vortex regime and controls the mixing with ambient air. This
results in mean microphysical characteristics such as ice mass and
optical depth that are slightly affected by the intensity of
atmospheric turbulence. However, the background humidity
and temperature have a first-order effect on the survival of ice
crystals and particle size distribution, which is in line with
recent studies. |
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