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000862872 1001_ $$0P:(DE-HGF)0$$aUrbanek, B.$$b0$$eCorresponding author
000862872 245__ $$aHigh Depolarization Ratios of Naturally Occurring Cirrus Clouds Near Air Traffic Regions Over Europe
000862872 260__ $$aHoboken, NJ$$bWiley$$c2018
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000862872 520__ $$aCirrus clouds have a large influence on the Earth's climate and anthropogenic activities such as aviation can alter their properties. Besides the formation of contrails, indirect effects on naturally occurring cirrus like increased heterogeneous freezing due to exhaust soot particles are discussed in the literature. However, hardly any observational study exists. In this work we present cirrus optical properties measured by an airborne lidar over Europe during the Midlatitude Cirrus experiment (ML‐CIRRUS). One half of the cloud cases showed elevated depolarization ratios with a mode difference of 10 percentage points indicating differences in the clouds microphysical properties. Their origin can be traced back to highly frequented air traffic regions, and they show lower in‐cloud ice supersaturations. Our analysis reveals no influence of embedded contrails and temperature. These results could be explained by an indirect aerosol effect where heterogeneous freezing is caused by aviation exhaust particles.
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000862872 7001_ $$0P:(DE-HGF)0$$aGroß, S.$$b1
000862872 7001_ $$0P:(DE-HGF)0$$aWirth, M.$$b2
000862872 7001_ $$0P:(DE-Juel1)139013$$aRolf, Christian$$b3$$ufzj
000862872 7001_ $$0P:(DE-Juel1)129131$$aKrämer, Martina$$b4$$ufzj
000862872 7001_ $$0P:(DE-HGF)0$$aVoigt, Christiane$$b5
000862872 773__ $$0PERI:(DE-600)2021599-X$$a10.1029/2018GL079345$$n23$$p13,166-13,172$$tGeophysical research letters$$v45$$x0094-8276$$y2018
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