A numerical study of aircraft wake induced ice cloud f= ormation CPL 1.0 Alpha1

A numerical study of aircraft wake induced ice cloud formation=
Gierens, KM;Strom, J
JOURNAL OF THE ATMOSPHERIC SCIENCES 55: (21) 3253-3263 NOV 1 1998

Document type:&nbs= pArticle

Language: English

Abstract:
Numerical simulations of ice cloud formation in the w= ake of an aircraft flying at cruise altitude have been performed. The eng= ine exhaust has been excluded from the simulations in order to study clou= d formation due solely to aerodynamic effects. The ice is formed via homo= geneous freezing nucleation of ambient haze droplets in the upwelling lim= bs of the vortex pair behind the aircraft. Properties of wake ice clouds = are compared with properties of contrails obtained with in situ measureme= nts and recent simulations. In particular the authors find that aerodynam= ically induced ice clouds are similar in microphysical and radiative resp= ects to contrails that are formed from the nucleation of exhaust particle= s. This means that under cold and moist conditions contrails as young as = 2-5 min may consist of similar amounts of aerodynamically produced and ex= haust triggered ice crystals.

Addresses:
Gierens KM, Deutsch Zentrum Luft & Raumfahrt, DLR, I= nst Phys Atmosphare, Postfach 1116, D-82230 Wessling, Germany.
Deutsch= Zentrum Luft & Raumfahrt, DLR, Inst Phys Atmosphare, D-82230 Wessling, G= ermany.
Stockholm Univ, Inst Meteorol, S-10691 Stockholm, Sweden.
<= P> Authors' E-mail Addresses:

Publisher:
AMER METEOROLOGICAL SOC, BOSTON

TGA Number:
136JD

ISSN:
0022-4928