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Ground based mobile scanning lidar for remote sensing of contrails

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

Annales Geophysicae 12 (1994), S.956-961 : Ill., Lit.
ISSN: 0939-4176
ISSN: 0980-8752
ISSN: 0992-7689
ISSN: 0980-8760
ISSN: 1432-0576
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert

Air traffic is a source of trace gases in the upper troposphere and lower stratosphere. Contrails readily form from water vapor exhausts under favorable meteorological conditions. Since contrails are ice crystal clouds like natural cirrus clouds, they bear a greenhouse potential which has to be, investigated. The IFU has built a scanning lidar system employing a pulsed Nd:YAG laser as the emitter and a 52-cm, diameter telescope as the receiver. Signals are processed in several channels to investigate depolarization and wavelength dependencies of the light backscattered from ice crystals. These investigations are aimed at the formation and life cycles of contrails, their optical properties, and their climatological consequences in areas of dense air traffic. The experimental lidar setup is described and a sample measurement is shown.