Large-eddy simulation study of contrail microphysics and geometry during the vortex phase and consequences on contrail-to-cirrus transition
Article first published online: 19 JUN 2014
©2014. American Geophysical Union. All Rights Reserved.
Journal of Geophysical Research: Atmospheres
Volume 119, Issue 12, pages 7537–7555, 27 June 2014
How to Cite
2014), Large-eddy simulation study of contrail microphysics and geometry during the vortex phase and consequences on contrail-to-cirrus transition, J. Geophys. Res. Atmos., 119, 7537–7555, doi:10.1002/2013JD021418.(
- Issue published online: 21 JUL 2014
- Article first published online: 19 JUN 2014
- Accepted manuscript online: 1 JUN 2014 09:37PM EST
- Manuscript Accepted: 27 MAY 2014
- Manuscript Received: 22 DEC 2013
- ice microphysics;
- numerical modeling;
Large-eddy simulations (LES) with Lagrangian ice microphysics were used to study the early contrail evolution during the vortex phase. Microphysical and geometrical properties of a contrail produced by a large-sized aircraft (type B777/A340) were investigated systematically for a large parameter range. Crystal loss due to adiabatic heating in the downward moving vortices was found to depend strongly on relative humidity and temperature, qualitatively similar to previous 2-D simulation results. Contrail depth is as large as 450 m for the investigated parameter range and was found to be underestimated in a previous 2-D study. Further sensitivity studies show a nonnegligible effect of the initial ice crystal size distribution and the initial ice crystal number on the crystal loss, whereas the contrail structure and ice mass evolution is only barely affected by these variations. Variation of fuel flow has the smallest effect on crystal loss. At high supersaturations, our choice of contrail spatial initialization may underestimate the ice crystal loss. The set of presented sensitivity studies is a first step toward a quantitative description of young contrails in terms of vertical extent and crystal loss. Concluding contrail-to-cirrus simulations demonstrate the relevance of vortex phase processes and its three-dimensional modeling on the later contrail-cirrus properties.