Contrail properties derived from high-resolution polarization lidar studies during SUCCESS

Physics

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Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Aerosols And Particles

Scientific paper

During the April 1996 SUCCESS field campaign, our ground-based polarization lidar studied a variety of contrails ranging from a new NASA DC-8 contrail to persisting contrails from commercial jet aircraft that had spread into an almost invisible cirrostratus sheet. What distinguishes these contrails from natural cirrus is their tendency to remain thin (~50-500 m), and to generate strong laser backscattering and depolarization, often along with solar coronas, even an hour or more after formation. Lidar depolarization ratios in persisting contrails ranged from ~0.3-0.7. Contrail-cirrus clouds composed of high numbers of small (20-30 μm) particles would satisfy these findings, which has implications for comprehending their radiative and climatic effects.

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