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Optical parameters of contrails from lidar measurements. Linear depolarization

: Freudenthaler, V.; Homburg, F.; Jäger, H.


Geophysical research letters 23 (1996), Nr.25, S.3715-3718 : Ill., Lit.
ISSN: 0094-8276
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert

By means of a scanning backscatter and depolarization lidar, contrails have been investigated for ages between a few seconds and 60 min. At environmental temperatures <= -60 deg C the depolarization measured in the contrails rises from about 0. 1 to 0.5 with time, whereas at higher temperatures around - 50 deg C already the youngest contrails exhibit depolarization values of about 0.5. This indicates a strong dependence of the aerosol formation and growth on the environmental temperature which might influence their behavior in the atmosphere.