properties of young contrails – a parametrisation based on large-eddy simulations
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2016
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Abstract
Contrail–cirrus is probably the largest climate forcing from aviation. The
evolution of contrail–cirrus and its radiative impact depends not only on
a multitude of atmospheric parameters, but also on the geometric and
microphysical properties of the young contrails evolving into
contrail–cirrus. The early evolution of contrails (t < 5 min) is
dominated by an interplay of ice microphysics and wake vortex dynamics. Young
contrails may undergo a fast vertical expansion due to a descent of the wake
vortices and may lose a substantial fraction of their ice crystals due to
adiabatic heating. The geometric depth H and total ice crystal number N of young contrails are highly variable and depend on many environmental and aircraft parameters. Both properties, H and N, affect the later properties of the evolving contrail–cirrus, as they control the extent of shear-induced spreading and sedimentation losses. In this study, we provide parametrisations of H and N after 5 min taking into account the effects of temperature, relative humidity, thermal stratification and aircraft type (mass, wing span, fuel burn). The parametrisations rely on a large data set of recent large-eddy simulations of young contrails. They are suited to be incorporated in larger-scale models in order to refine the present-day contrail initialisations by considering the processes that strongly affect the contrail evolution during the vortex phase.
| Reference Key |
unterstrasser2016atmosphericproperties
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|---|---|
| Authors | ;S. Unterstrasser |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-2059-2016
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| URL | |
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